FUNCTIONAL BLOCK DIAGRAM DV CC V DD V SS AGND DGND LDAC X2A REGISTER X2B REGISTER A/B MUX MUX X2A REGISTER X2B REGISTER A/B MUX MUX
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1 16-Chael, 16-/14-Bit, Serial Iput, Voltage-Output DAC AD5360/AD5361 FEATURES 16-chael DAC i 52-lead LQFP ad 56-lead LFCSP packages Guarateed mootoic to 16/14 bits Nomial output voltage rage of 10 V to +10 V Multiple output spas available Temperature moitorig fuctio Chael moitorig multiplexer GPIO fuctio System calibratio fuctio allowig user-programmable offset ad gai Chael groupig ad addressig features Data error checkig feature SPI-compatible serial iterface 2.5 V to 5.5 V digital iterface Digital reset (RESET) Clear fuctio to user-defied SIGGNDx Simultaeous update of DAC outputs APPLICATIONS Istrumetatio Idustrial cotrol systems Level settig i automatic test equipmet (ATE) Variable optical atteuators (VOA) Optical lie cards FUNCTIONAL BLOCK DIAGRAM DV CC V DD V SS AGND DGND LDAC TEMP_OUT PEC MON_IN0 MON_IN1 MON_OUT GPIO BIN/2SCOMP SYNC SDI SCLK SDO BUSY RESET CLR TEMP SENSOR 8 CONTROL VOUT0 TO VOUT15 6 MUX GPIO SERIAL INTERFACE STATE MACHINE AD5360/ AD A/B SELECT 8 X1 M C 8 A/B SELECT 8 X1 M C = 16 FOR AD5360 = 14 FOR AD5361 X1 M C X1 M C TO MUX 2s TO MUX 2s A/B MUX A/B MUX A/B MUX A/B MUX X2A X2B X2A X2B X2A X2B X2A X2B Figure 1. MUX 2 MUX 2 MUX 2 MUX 2 14 OFS OFS1 DAC 0 DAC 7 DAC 0 DAC 7 OFFSET DAC 0 DAC 0 DAC 7 OFFSET DAC 1 DAC 0 DAC 7 BUFFER BUFFER BUFFER GROUP 0 OUTPUT BUFFER AND POWER- DOWN CONTROL OUTPUT BUFFER AND POWER- DOWN CONTROL GROUP 1 OUTPUT BUFFER AND POWER- DOWN CONTROL OUTPUT BUFFER AND POWER- DOWN CONTROL VREF0 VOUT0 VOUT1 VOUT2 VOUT3 VOUT4 VOUT5 VOUT6 VOUT7 SIGGND0 VREF1 VOUT8 VOUT9 VOUT10 VOUT11 VOUT12 VOUT13 VOUT14 VOUT15 SIGGND Rev. A Iformatio furished by Aalog Devices is believed to be accurate ad reliable. However, o resposibility is assumed by Aalog Devices for its use, or for ay ifrigemets of patets or other rights of third parties that may result from its use. Specificatios subject to chage without otice. No licese is grated by implicatio or otherwise uder ay patet or patet rights of Aalog Devices. Trademarks ad registered trademarks are the property of their respective owers. Oe Techology Way, P.O. Box 9106, Norwood, MA , U.S.A. Tel: Fax: Aalog Devices, Ic. All rights reserved.
2 Powered by TCPDF ( IMPORTANT LINKS for the AD5360_5361* Last cotet update 09/06/ :05 pm PARAMETRIC SELECTION TABLES Fid Similar Products By Operatig Parameters AD536x, AD537x Family Product Selectio Guide DESIGN TOOLS, MODELS, DRIVERS & SOFTWARE AD536x_7x Voltage Calculator AD5360 IIO Multi-Chael DAC Liux Driver (Wiki Site) DOCUMENTATION AN-0986: Adjustig the Output Rage ad Spa of the AD5362 AN-1036: Clear to Ay Voltage Usig the AD5370 D/A Coverters Are Jammed With Fuctioality Digital to Aalog Coverters ICs Solutios Bulleti Automatic Test Equipmet Brochure Aalog Devices exteds its desedac family of data coverters ICs for Programmable Logic Cotrol ad Distributed Cotrol Systems Extedig the desedac Multichael D/As FOR THE AD5360 CN-0131: 16 Chaels of Programmable Output Spa Usig the AD Bit Voltage Output DAC CN-0123: Automated Calibratio Techique That Reduces the AD Chael, 16-Bit DAC Offset Voltage to Less Tha 1 mv PRODUCT RECOMMENDATIONS & REFERENCE DESIGNS CN-0131:16 Chaels of Programmable Output Spa Usig the AD Bit Voltage Output DAC CN-0123:Automated Calibratio Techique That Reduces the AD Chael, 16-Bit DAC Offset Voltage to Less Tha 1 mv DESIGN COLLABORATION COMMUNITY Collaborate Olie with the ADI support team ad other desigers about select ADI products. Follow us o Twitter: Like us o Facebook: DESIGN SUPPORT Submit your support request here: Liear ad Data Coverters Embedded Processig ad DSP Telephoe our Customer Iteractio Ceters toll free: Americas: Europe: Chia: Idia: Russia: Quality ad Reliability Lead(Pb)-Free Data EVALUATION KITS & SYMBOLS & FOOTPRINTS View the Evaluatio Boards ad Kits page for the AD5360 View the Evaluatio Boards ad Kits page for the AD5361 Symbols ad Footprits for the AD5360 Symbols ad Footprits for the AD5361 SAMPLE & BUY AD5360 AD5361 View Price & Packagig Request Evaluatio Board Request Samples Check Ivetory & Purchase Fid Local Distributors * This page was dyamically geerated by Aalog Devices, Ic. ad iserted ito this data sheet. Note: Dyamic chages to the cotet o this page (labeled 'Importat Liks') does ot costitute a chage to the revisio umber of the product data sheet. This cotet may be frequetly modified.
3 TABLE OF CONTENTS Features... 1 Applicatios... 1 Fuctioal Block Diagram... 1 Revisio History... 2 Geeral Descriptio... 3 Specificatios... 4 AC Characteristics... 5 Timig Characteristics... 6 Absolute Maximum Ratigs... 9 ESD Cautio... 9 Pi Cofiguratio ad Fuctio Descriptios Typical Performace Characteristics Termiology Fuctioal Descriptio DAC Architecture Chael Groups A/B Registers Gai/Offset Adjustmet Offset DACs Output Amplifier Trasfer Fuctio Referece Selectio Calibratio Reset Fuctio Clear Fuctio BUSY ad LDAC Fuctios BIN/2SCOMP PIN Temperature Sesor Moitor Fuctio GPIO Pi Power-Dow Mode Thermal Moitorig Fuctio Toggle Mode Serial Iterface SPI Write Mode SPI Readback Mode Register Update Rates Packet Error Checkig Chael Addressig ad Special Modes Special Fuctio Mode Power Supply Decouplig Power Supply Sequecig Iterfacig Examples Outlie Dimesios Orderig Guide REVISION HISTORY 2/08 Rev. 0 to Rev. A Added LFCSP Package... Uiversal Chage to DC Crosstalk Parameter... 4 Chage to Power Dissipatio Uloaded (P) Parameter... 5 Added t23 Parameter... 6 Chage to Figure Chage to Table 5 Summary... 9 Added Figure Chages to Table Chages to Calibratio Sectio Chages to Reset Fuctio Sectio Added Packet Error Checkig Sectio Updated Outlie Dimesios Chages to Orderig Guide /07 Revisio 0: Iitial Versio Rev. A Page 2 of 28
4 GENERAL DESCRIPTION The AD5360/AD5361 cotai sixtee, 16-/14-bit DACs i a sigle 52-lead LQFP or 56-lead LFCSP package. They provide buffered voltage outputs with a spa four times the referece voltage. The gai ad offset of each DAC ca be idepedetly trimmed to remove errors. For eve greater flexibility, the device is divided ito two groups of eight DACs, ad the output rage of each group ca be idepedetly adjusted by a offset DAC. The AD5360/AD5361 offer guarateed operatio over a wide supply rage with VSS from 4.5 V to 16.5 V ad VDD from +8 V to V. The output amplifier headroom requiremet is 1.4 V. The AD5360/AD5361 have a high speed 4-wire serial iterface, which is compatible with SPI, QSPI, MICROWIRE, ad DSP iterface stadards ad ca hadle clock speeds of up to 50 MHz. All the outputs ca be updated simultaeously by takig the LDAC iput low. Each chael has a programmable gai register ad a offset adjust register. Each DAC output is amplified ad buffered o-chip with respect to a exteral SIGGNDx iput. The DAC outputs ca also be switched to SIGGNDx via the CLR pi. Rev. A Page 3 of 28
5 SPECIFICATIONS DVCC = 2.5 V to 5.5 V; VDD = 9 V to 16.5 V; VSS = 16.5 V to 4.5 V; VREF = 5 V; AGND = DGND = SIGGND = 0 V; RL = ope circuit; gai (M), offset (C), ad DAC offset registers at default value; all specificatios TMIN to TMAX, uless otherwise oted. Table 1. Parameter B Versio 1 Uit Test Coditios/Commets ACCURACY Resolutio AD Bits AD Bits Relative Accuracy AD5360 ±4 LSB max AD5361 ±1 LSB max Differetial Noliearity ±1 LSB max Guarateed mootoic by desig over temperature Zero-Scale Error ±15 mv max Before calibratio Full-Scale Error ±20 mv max Before calibratio Gai Error 0.1 % FSR Before calibratio Zero-Scale Error 2 1 LSB typ After calibratio Full-Scale Error 2 1 LSB typ After calibratio Spa Error of Offset DAC ±75 mv max See the Offset DACS sectio for details VOUTx 3 Temperature Coefficiet 5 ppm FSR/ C typ Icludes liearity, offset, ad gai drift DC Crosstalk μv max Typically 20 μv; measured chael at midscale, full-scale chage o ay other chael REFERENCE INPUTS (VREF0, VREF1) 2 VREF Iput Curret ±10 μa max Per iput; typically ±30 A VREF Rage 2 2/5 V mi/max ±2% for specified operatio SIGGND INPUT (SIGGND0 to SIGGND1) 4 DC Iput Impedace 50 kω mi Typically 55 kω Iput Rage ±0.5 V max SIGGND Gai 0.995/1.005 Mi/max OUTPUT CHARACTERISTICS 2 Output Voltage Rage VSS V mi ILOAD = 1 ma VDD 1.4 V max ILOAD = 1 ma Nomial Output Voltage Rage 10 to +10 V omial Short-Circuit Curret 15 ma max VOUTx 3 to DVCC, VDD, or VSS Load Curret ±1 ma max Capacitive Load 2200 pf max DC Output Impedace 0.5 Ω max MONITOR PIN (MON_OUT) 4 Output Impedace DAC Output at Positive Full-Scale 1000 Ω typ DAC Output at Negative Full-Scale 500 Ω typ Three-State Leakage Curret 100 A typ Cotiuous Curret Limit 2 ma max DIGITAL INPUTS JEDEC compliat Iput High Voltage 1.7 V mi DVCC = 2.5 V to 3.6 V 2.0 V mi DVCC = 3.6 V to 5.5 V Iput Low Voltage 0.8 V max DVCC = 2.5 V to 5.5 V Iput Curret ±1 μa max RESET, SYNC, SDI, ad SCLK pis ±20 μa max CLR, BIN/2SCOMP, ad GPIO pis Iput Capacitace 4 10 pf max Rev. A Page 4 of 28
6 Parameter B Versio 1 Uit Test Coditios/Commets DIGITAL OUTPUTS (SDO, BUSY, GPIO, PEC) Output Low Voltage 0.5 V max Sikig 200 μa Output High Voltage (SDO) DVCC 0.5 V mi Sourcig 200 μa High Impedace Leakage Curret ±5 μa max SDO oly High Impedace Output Capacitace 4 10 pf typ TEMPERATURE SENSOR (TEMP_OUT) 4 Accuracy ±1 C 25 C ±5 C typ 40 C < T < +85 C Output Voltage at 25 C 1.46 V typ Output Voltage Scale Factor 4.4 mv/ C typ Output Load Curret 200 μa max Curret source oly Power-O Time 10 ms typ To withi ±5 C POWER REQUIREMENTS DVCC 2.5/5.5 V mi/max VDD 8/16.5 V mi/max VSS 4.5/ 16.5 V mi/max Power Supply Sesitivity 4 Full Scale/ VDD 75 db typ Full Scale/ VSS 75 db typ Full Scale/ DVCC 90 db typ DICC 2 ma max VCC = 5.5 V, VIH = DVCC, VIL = GND IDD 10 ma max Outputs uloaded ISS 10 ma max Outputs uloaded Power-Dow Mode Bit 0 i the Cotrol Register is 1 DICC 5 μa typ IDD 35 μa typ ISS 35 μa typ Power Dissipatio Power Dissipatio Uloaded (P) 245 mw max VSS = 12 V, VDD = +12 V, DVCC = 2.5 V Juctio Temperature 130 C max TJ = TA + PTOTAL θja 1 Temperature rage for B versio: 40 C to +85 C. Typical specificatios are at 25 C. 2 Specificatios are guarateed for a 5 V referece oly. 3 VOUTx refers to ay of VOUT0 to VOUT15. 4 Guarateed by desig ad characterizatio, ot productio tested. AC CHARACTERISTICS DVCC = 2.5 V; VDD = 15 V; VSS = 15 V; VREF = 5 V; AGND = DGND = SIGGND = 0 V; CL = 200 pf; RL = 10 kω; gai (M), offset (C), ad DAC offset registers at default value; all specificatios TMIN to TMAX, uless otherwise oted. Table 2. Parameter B Versio 1 Uit Test Coditios/Commets DYNAMIC PERFORMANCE 1 Output Voltage Settlig Time 20 μs typ Full-scale chage 30 μs max DAC latch cotets alterately loaded with all 0s ad all 1s Slew Rate 1 V/μs typ Digital-to-Aalog Glitch Eergy 5 V-s typ Glitch Impulse Peak Amplitude 10 mv max Chael-to-Chael Isolatio 100 db typ VREF0, VREF1 = 2 V p-p, 1 khz DAC-to-DAC Crosstalk 10 V-s typ Digital Crosstalk 0.2 V-s typ Digital Feedthrough 0.02 V-s typ Effect of iput bus activity o DAC output uder test Output Noise Spectral 10 khz 250 V/ Hz typ VREF0 = VREF1 = 0 V 1 Guarateed by desig ad characterizatio, ot productio tested. Rev. A Page 5 of 28
7 TIMING CHARACTERISTICS DVCC = 2.5 V to 5.5 V; VDD = 9 V to 16.5 V; VSS = 8 V to 16.5 V; VREF = 5 V; AGND = DGND = SIGGND = 0 V; CL = 200 pf to GND; RL = ope circuit; gai (M), offset (C), ad DAC offset registers at default values; all specificatios TMIN to TMAX, uless otherwise oted. Table 3. SPI Iterface (See Figure 4 ad Figure 5) Parameter 1, 2 Limit at TMIN, TMAX Uit Descriptio t1 20 s mi SCLK cycle time t2 8 s mi SCLK high time t3 8 s mi SCLK low time t4 11 s mi SYNC fallig edge to SCLK fallig edge setup time t5 20 s mi Miimum SYNC high time t6 10 s mi 24th SCLK fallig edge to SYNC risig edge t7 5 s mi Data setup time t8 5 s mi Data hold time t s max SYNC risig edge to BUSY fallig edge t10 1/1.5 μs typ/max BUSY pulse width low (sigle-chael update); see Table 8 t s max Sigle-chael update cycle time t12 20 s mi SYNC risig edge to LDAC fallig edge t13 10 s mi LDAC pulse width low t14 3 μs max BUSY risig edge to DAC output respose time t15 0 s mi BUSY risig edge to LDAC fallig edge t16 3 μs max LDAC fallig edge to DAC output respose time t17 20/30 μs typ/max DAC output settlig time t s max CLR/RESET pulse activatio time t19 30 s mi RESET pulse width low t μs max RESET time idicated by BUSY low t s mi Miimum SYNC high time i readback mode t s max SCLK risig edge to SDO valid t23 80 s max RESET risig edge to BUSY fallig edge 1 Guarateed by desig ad characterizatio, ot productio tested. 2 All iput sigals are specified with tr = tf = 2 s (10% to 90% of DVCC) ad timed from a voltage level of 1.2 V. 3 This is measured with the load circuit show i Figure 2. 4 This is measured with the load circuit show i Figure µA I OL TO OUTPUT PIN DV CC R L 2.2kΩ C L 50pF V OL Figure 2. Load Circuit for BUSY Timig Diagram TO OUTPUT PIN C L 50pF 200µA I OH V OH (MIN) V OL (MAX) Figure 3. Load Circuit for SDO Timig Diagram Rev. A Page 6 of 28
8 t 1 SCLK t 3 t 11 t 4 t 2 t 6 SYNC t 5 t 7 t 8 SDI DB23 DB0 t 9 BUSY t 10 t 12 t 13 LDAC 1 t 17 VOUTx 1 t 14 t 15 t 13 LDAC 2 t 17 VOUTx 2 t 16 CLR t 18 VOUTx t 19 RESET VOUTx BUSY t 18 t 20 t 23 1 LDAC ACTIVE DURING BUSY. 2 LDAC ACTIVE AFTER BUSY Figure 4. SPI Write Timig Rev. A Page 7 of 28
9 t 22 SCLK 48 t 21 SYNC SDI DB23 DB0 DB23 DB0 INPUT WORD SPECIFIES TO BE READ NOP CONDITION SDO DB0 DB23 DB15 DB0 LSB FROM PREVIOUS WRITE Figure 5. SPI Read Timig SELECTED DATA CLOCKED OUT OUTPUT VOLTAGE VMAX ACTUAL TRANSFER FUNCTION FULL-SCALE ERROR + ZERO-SCALE ERROR IDEAL TRANSFER FUNCTION 0 DAC CODE 2 N 1 = 16 FOR AD5360 = 14 FOR AD5361 VMIN ZERO-SCALE ERROR Figure 6. DAC Trasfer Fuctio Rev. A Page 8 of 28
10 ABSOLUTE MAXIMUM RATINGS TA = 25 C, uless otherwise oted. Trasiet currets of up to 60 ma do ot cause SCR latch-up. Table 4. Parameter Ratig VDD to AGND 0.3 V to +17 V VSS to AGND 17 V to +0.3 V DVCC to DGND 0.3 V to +7 V Digital Iputs to DGND 0.3 V to DVCC V Digital Outputs to DGND 0.3 V to DVCC V VREF0, VREF1 to AGND 0.3 V to +5.5 V VOUT0 to VOUT15 to AGND VSS 0.3 V to VDD V SIGGND0, SIGGND1 to AGND 1 V to +1 V AGND to DGND 0.3 V to +0.3 V MON_IN0, MON_IN1, MON_OUT to AGND VSS 0.3 V to VDD V Operatig Temperature (TA) Idustrial (B Versio) 40 C to +85 C Storage 65 C to +150 C Juctio (TJ max) 130 C θja Thermal Impedace 52-Lead LQFP 38 C/W 56-Lead LFCSP 25 C/W Reflow Solderig Peak Temperature 230 C Time at Peak Temperature 10 sec to 40 sec Stresses above those listed uder Absolute Maximum Ratigs may cause permaet damage to the device. This is a stress ratig oly; fuctioal operatio of the device at these or ay other coditios above those idicated i the operatioal sectio of this specificatio is ot implied. Exposure to absolute maximum ratig coditios for exteded periods may affect device reliability. ESD CAUTION Rev. A Page 9 of 28
11 NC NC VOUT8 VOUT9 VOUT10 VOUT11 SIGGND1 VOUT12 VOUT13 VOUT14 VOUT15 NC NC NC AD5360/AD5361 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS AGND DGND DV CC SDO PEC SDI SCLK SYNC DV CC DGND VOUT7 VOUT6 VOUT CLR 55 LDAC 54 AGND 53 DGND 52 DV CC 51 SDO 50 PEC 49 SDI 48 SCLK 47 SYNC 46 DV CC 45 DGND 44 VOUT7 43 VOUT6 LDAC 1 CLR 2 RESET 3 BIN/2SCOMP 4 BUSY 5 GPIO 6 MON_OUT 7 MON_IN0 8 NC 9 NC 10 V DD 11 V SS 12 VREF1 13 PIN 1 INDICATOR AD5360/ AD5361 TOP VIEW (Not to Scale) VOUT4 38 SIGGND0 37 VOUT3 36 VOUT2 35 VOUT1 34 VOUT0 33 TEMP_OUT 32 MON_IN1 31 VREF0 30 NC 29 V SS 28 V DD 27 NC RESET 1 BIN/2SCOMP 2 BUSY 3 GPIO 4 MON_OUT 5 MON_IN0 6 NC 7 NC 8 NC 9 NC 10 NC 11 V DD 12 V SS 13 VREF1 14 NC = NO CONNECT PIN 1 INDICATOR AD5360/ AD5361 TOP VIEW (Not to Scale) 42 VOUT5 41 VOUT4 40 SIGGND0 39 VOUT3 38 VOUT2 37 VOUT1 36 VOUT0 35 TEMP_OUT 34 MON_IN1 33 VREF0 32 NC 31 NC 30 V SS 29 V DD NC = NO CONNECT NC VOUT8 VOUT9 VOUT10 VOUT11 SIGGND1 VOUT12 VOUT13 VOUT14 VOUT15 NC NC NC Figure Lead LQFP Pi Cofiguratio Figure Lead LFCSP Pi Cofiguratio Table 5. LQFP Pi Fuctio Descriptios Pi No. LQFP LFCSP Memoic Descriptio 1 55 LDAC Load DAC Logic Iput (Active Low). See the BUSY ad LDAC Fuctios sectio for more iformatio CLR Asychroous Clear Iput (Level Sesitive, Active Low). See the Clear Fuctio sectio for more iformatio. 3 1 RESET Digital Reset Iput. 4 2 BIN/2SCOMP Data Format Digital Iput. Coectig this pi to DGND selects offset biary. Coectig this pi to logic 1 selects twos complemet. This iput has a weak pull-dow. 5 3 BUSY Digital Iput/Ope-Drai Output. BUSY is ope drai whe it is a output. See the BUSY ad LDAC Fuctios sectio for more iformatio. 6 4 GPIO Digital I/O Pi. This pi ca be cofigured as a iput or output that ca be read or programmed high or low via the serial iterface. Whe cofigured as a iput, it has a weak pull-dow. 7 5 MON_OUT Aalog Multiplexer Output. Ay DAC output, the MON_IN0 iput, or the MON_IN1 iput ca be switched to this output. 8, 32 6, 34 MON_IN0, MON_IN1 Aalog Multiplexer Iputs. Ca be switched to MON_OUT. 9, 10, 14, 24, 25, 7 to 11, 15, 16, NC No Coect. 26, 27, to 28, 31, 32 11, 28 12, 29 VDD Positive Aalog Power Supply; +9 V to V for specified performace. These pis should be decoupled with 0.1 μf ceramic capacitors ad 10 μf capacitors. 12, 29 13, 30 VSS Negative Aalog Power Supply; 16.5 V to 8 V for specified performace. These pis should be decoupled with 0.1 μf ceramic capacitors ad 10 μf capacitors VREF1 Referece Iput for DAC 8 to DAC 15. This voltage is referred to AGND SIGGND1 Referece Groud for DAC 8 to DAC 15. VOUT8 to VOUT15 are refereced to this voltage VREF0 Referece Iput for DAC 0 to DAC 7. This voltage is referred to AGND TEMP_OUT Provides a output voltage proportioal to chip temperature. This is typically 1.46 V at 25 C with a output variatio of 4.4 mv/ C. 34 to 37, 39 to 42, 15 to 18, 20 to to 39, 41 to 44, 17 to 20, 22 to 25 VOUT0 to VOUT15 DAC Outputs. Buffered aalog outputs for each of the 16 DAC chaels. Each aalog output is capable of drivig a output load of 10 kω to groud. Typical output impedace of these amplifiers is 0.5 Ω. Rev. A Page 10 of 28
12 Pi No. LQFP LFCSP Memoic Descriptio SIGGND0 Referece Groud for DAC 0 to DAC 7. VOUT0 to VOUT7 are refereced to this voltage. 43, 51 45, 53 DGND Groud for All Digital Circuitry. Both DGND pis should be coected to the DGND plae. 44, 50 46, 52 DVCC Logic Power Supply; 2.5 V to 5.5 V. These pis should be decoupled with 0.1 μf ceramic capacitors ad 10 μf capacitors SYNC Active Low or SYNC Iput for SPI Iterface. This is the frame sychroizatio sigal for the SPI serial iterface. See Figure 4, Figure 5, ad the Serial Iterface sectio for more details SCLK Serial Clock Iput for SPI Iterface. See Figure 4, Figure 5, ad the Serial Iterface sectio for more details SDI Serial Data Iput for SPI Iterface. See Figure 4, Figure 5, ad the Serial Iterface sectio for more details PEC Packet Error Check Output. This is a ope-drai output with a 50 kω pull-up that goes low if the packet error check fails SDO Serial Data Output for SPI Iterface. See Figure 4, Figure 5, ad the Serial Iterface sectio for more details AGND Groud for All Aalog Circuitry. The AGND pi should be coected to the AGND plae. EP Coect to VSS Exposed Paddle. Rev. A Page 11 of 28
13 TYPICAL PERFORMANCE CHARACTERISTICS T A = 25 C V SS = 15V V DD = +15V V REF = V INL (LSB) 0 AMPLITUDE (V) DAC CODE Figure 9. Typical AD5360 INL Plot TIME (µs) Figure 12. Digital Crosstalk V DD = +15V V SS = 15V DV CC = +5V V REF = +3V INL ERROR (LSB) 0 DNL (LSB) TEMPERATURE ( C) Figure 10. Typical INL Error vs. Temperature DAC CODE Figure 13. Typical AD5360 DNL Plot T A = 25 C V SS = 15V V DD = +15V V REF = V AMPLITUDE (V) 0.01 OUTPUT NOISE (V/ Hz) TIME (µs) Figure 11. Aalog Crosstalk Due to LDAC FREQUENCY (Hz) Figure 14. Noise Spectral Desity Rev. A Page 12 of 28
14 V SS = 12V V DD = +12V V REF = +3V 6 5 DV CC = 5V T A = 25 C I CC (ma) DV CC = +5.5V DV CC = +2.5V DV CC = +3.6V NUMBER OF UNITS TEMPERATURE ( C) Figure 15. ICC vs. Temperature I CC (ma) Figure 18. Typical ICC Distributio I DD /I SS (ma) I SS I DD VOLTAGE (V) V SS = 12V V DD = +12V V REF = +3V TEMPERATURE ( C) Figure 16. IDD/ISS vs. Temperature TEMPERATURE ( C) Figure 19. TEMP_OUT Voltage vs. Temperature V DD = 15V V SS = 15V T A = 25 C 1.0 FULL-SCALE NUMBER OF UNITS VOUTx MON_OUT (V) MIDSCALE ZERO-SCALE I DD (ma) Figure 17. Typical IDD Distributio MON_OUT CURRENT (ma) Figure 20. (VOUTx MON_OUT Voltage) vs. MON_OUT Curret Rev. A Page 13 of 28
15 TERMINOLOGY Itegral Noliearity (INL) Itegral oliearity, or relative accuracy, is a measure of the maximum deviatio from a straight lie passig through the edpoits of the DAC trasfer fuctio. It is measured after adjustig for zero-scale error ad full-scale error ad is expressed i least sigificat bits (LSB). Differetial Noliearity (DNL) Differetial oliearity is the differece betwee the measured chage ad the ideal 1 LSB chage betwee ay two adjacet codes. A specified differetial oliearity of 1 LSB maximum esures mootoicity. Zero-Scale Error Zero-scale error is the error i the DAC output voltage whe all 0s are loaded ito the DAC register. Zero-scale error is a measure of the differece betwee VOUT (actual) ad VOUT (ideal), expressed i millivolts, whe the chael is at its miimum value. Zero-scale error is maily due to offsets i the output amplifier. Full-Scale Error Full-scale error is the error i DAC output voltage whe all 1s are loaded ito the DAC register. Full-scale error is a measure of the differece betwee VOUT (actual) ad VOUT (ideal), expressed i millivolts, whe the chael is at its maximum value. It does ot iclude zeroscale error. Gai Error Gai error is the differece betwee full-scale error ad zeroscale error. It is expressed i millivolts. Gai Error = Full-Scale Error Zero-Scale Error VOUT Temperature Coefficiet This icludes output error cotributios from liearity, offset, ad gai drift. DC Output Impedace DC output impedace is the effective output source resistace. It is domiated by package lead resistace. DC Crosstalk The DAC outputs are buffered by op amps that share commo VDD ad VSS power supplies. If the dc load curret chages i oe chael (due to a update), this ca result i a further dc chage i oe or more chael outputs. This effect is more sigificat at high load currets ad reduces as the load currets are reduced. With high impedace loads, the effect is virtually immeasurable. Multiple VDD ad VSS termials are provided to miimize dc crosstalk. Output Voltage Settlig Time The amout of time it takes for the output of a DAC to settle to a specified level for a full-scale iput chage. Digital-to-Aalog Glitch Eergy This is the amout of eergy ijected ito the aalog output at the major code trasitio. It is specified as the area of the glitch i V-s. It is measured by togglig the DAC register data betwee 0x7FFF ad 0x8000 (AD5360) or 0x1FFF ad 0x2000 (AD5361). Chael-to-Chael Isolatio Chael-to-chael isolatio refers to the proportio of iput sigal from the referece iput of oe DAC that appears at the output of aother DAC operatig from aother referece. It is expressed i decibels ad measured at midscale. DAC-to-DAC Crosstalk DAC-to-DAC crosstalk is the glitch impulse that appears at the output of oe coverter due to both the digital chage ad subsequet aalog output chage at aother coverter. It is specified i V-s. Digital Crosstalk Digital crosstalk is defied as the glitch impulse trasferred to the output of oe coverter due to a chage i the DAC register code of aother coverter ad is specified i V-s. Digital Feedthrough Whe the device is ot selected, high frequecy logic activity o the device s digital iputs ca be capacitively coupled both across ad through the device to show up as oise o the VOUTx pis. It ca also be coupled alog the supply ad groud lies. This oise is digital feedthrough. Output Noise Spectral Desity Output oise spectral desity is a measure of iterally geerated radom oise. Radom oise is characterized as a spectral desity (voltage per Hz). It is measured by loadig all DACs to midscale ad measurig oise at the output. It is measured i V/ Hz. Rev. A Page 14 of 28
16 FUNCTIONAL DESCRIPTION DAC ARCHITECTURE The AD5360/AD5361 cotai 16 DAC chaels ad 16 output amplifiers i a sigle package. The architecture of a sigle DAC chael cosists of a 16-bit resistor-strig DAC i the case of the AD5360 ad a 14-bit DAC i the case of the AD5361, followed by a output buffer amplifier. The resistor-strig sectio is simply a strig of resistors, of equal value, from VREF0 or VREF1 to AGND. This type of architecture guaratees DAC mootoicity. The 16-/14-bit biary digital code loaded to the DAC register determies at which ode o the strig the voltage is tapped off before beig fed ito the output amplifier. The output amplifier multiplies the DAC output voltage by 4. The omial output spa is 12 V with a 3 V referece ad 20 V with a 5 V referece. CHANNEL GROUPS The 16 DAC chaels of the AD5360/AD5361 are arraged ito two groups of eight chaels. The eight DACs of Group 0 derive their referece voltage from VREF0. Group 1 derives its referece voltage from VREF1. Each group has its ow sigal groud pi. Table 6. AD5360/AD5361 Registers Register Name Word Legth i Bits Descriptio X1A (group) (chael) 16 (14) Iput Data Register A, oe for each DAC chael. X1B (group) (chael) 16 (14) Iput Data Register B, oe for each DAC chael. M (group) (chael) 16 (14) Gai trim register, oe for each DAC chael. C (group) (chael) 16 (14) Offset trim register, oe for each DAC chael. X2A (group) (chael) 16 (14) Output Data Register A, oe for each DAC chael. These registers store the fial, calibrated DAC data after gai ad offset trimmig. They are ot readable or directly writable. X2B (group) (chael) 16 (14) Output Data Register B, oe for each DAC chael. These registers store the fial, calibrated DAC data after gai ad offset trimmig. They are ot readable or directly writable. DAC (group) (chael) Data registers from which the DACs take their fial iput data. The DAC registers are updated from the X2A or X2B registers. They are ot readable or directly writable. OFS0 14 Offset DAC 0 data register, sets offset for Group 0. OFS1 14 Offset DAC 1 data register, sets offset for Group 1. Cotrol 5 Cotrol register. Moitor 6 Moitor eable ad cofiguratio register. GPIO 2 GPIO cofiguratio register. Table 7. AD5360/AD5361 Iput Register Default Values Register Name AD5360 Default Value AD5361 Default Value X1A, X1B 0x8000 0x2000 M 0xFFFF 0x3FFF C 0x8000 0x2000 OFS0, OFS1 0x2000 0x2000 Cotrol 0x00 0x00 A/B Select 0 ad A/B Select 1 0x00 0x00 Rev. A Page 15 of 28
17 A/B S GAIN/OFFSET ADJUSTMENT Each DAC chael has seve data registers. The actual DAC data word ca be writte to either the X1A or X1B iput register, depedig o the settig of the A/B bit i the cotrol register. If the A/B bit is 0, data is writte to the X1A register. If the A/B bit is 1, data is writte to the X1B register. Note that this sigle bit is a global cotrol ad affects every DAC chael i the device. It is ot possible to set up the device o a perchael basis so that some writes are to the X1A register ad some writes are to the X1B register. X1A X1B M C MUX X2A X2B MUX DAC Figure 21. Data Registers Associated with Each DAC Chael DAC Each DAC chael also has a gai register (M) ad a offset (C) register, which allow trimmig out of the gai ad offset errors of the etire sigal chai. Data from the X1A register is operated o by a digital multiplier ad adder by the cotets of the M ad C registers. The calibrated DAC data is the stored i the X2A register. Similarly, data from the X1B register is operated o by the multiplier ad adder ad stored i the X2B register. Although a multiplier ad adder symbol are show for each chael, there is oly oe multiplier ad oe adder i the device, which are shared amog all chaels. This has implicatios for the update speed whe several chaels are updated at oce, as described i the Register Update Rates sectio. Each time data is writte to the X1A register, or to the M or C register with the A/B cotrol bit set to 0, the X2A data is recalculated ad the X2A register is automatically updated. Similarly, X2B is updated each time data is writte to X1B, or to M or C with A/B set to 1. The X2A ad X2B registers are ot readable or directly writable by the user. Data output from the X2A ad X2B registers is routed to the fial DAC register by a multiplexer. A 8-bit A/B select register associated with each group of eight DACs cotrols whether each idividual DAC takes its data from the X2A or X2B register. If a bit i this register is 0, the DAC takes its data from the X2A register; if 1, the DAC takes its data from the X2B register (Bit 0 through Bit 7 cotrol DAC 0 through DAC 7, respectively). Note that because there are 16 bits i two registers, it is possible to set up, o a per-chael basis, whether each DAC takes its data from the X2A register or X2B register. A global commad is also provided that sets all bits i the A/B select registers to 0 or to All DACs i the AD5360/AD5361 ca be updated simultaeously by takig LDAC low, whe each DAC register is updated from either its X2A or X2B register, depedig o the settig of the A/B select registers. The DAC register is ot readable or directly writable by the user. OFFSET DACs I additio to the gai ad offset trim for each DAC, there are two 14-bit offset DACs, oe for Group 0, ad oe for Group 1. These allow the output rage of all DACs coected to them to be offset withi a defied rage. Thus, subject to the limitatios of headroom, it is possible to set the output rage of Group 0 ad/or Group 1 to be uipolar positive, uipolar egative, or bipolar (either symmetrical or asymmetrical) about 0 V. The DACs i the AD5360/AD5361 are factory trimmed with the offset DACs set at their default values. This gives the best offset ad gai performace for the default output rage ad spa. Whe the output rage is adjusted by chagig the value of the offset DAC, a extra offset is itroduced due to the gai error of the offset DAC. The amout of offset is depedet o the magitude of the referece ad how much the offset DAC moves from its default value. This offset is show i Table 1. The worst-case offset occurs whe the offset DAC is at positive full scale or egative full scale. This value ca be added to the offset preset i the mai DAC of a chael to give a idicatio of the overall offset for that chael. I most cases, the offset ca be removed by programmig the C register of the chael with a appropriate value. The extra offset caused by the offset DACs eeds to be take ito accout oly whe the offset DAC is chaged from its default value. Figure 22 shows the allowable code rage that ca be loaded to the offset DAC, ad this is depedet o the referece value used. Thus, for a 5 V referece, the offset DAC should ot be programmed with a value greater tha 8192 (0x2000). VREF (V) OFFSET DAC CODE Figure 22. Offset DAC Code Rage RESERVED Rev. A Page 16 of 28
18 OUTPUT AMPLIFIER Because the output amplifiers ca swig to 1.4 V below the positive supply ad 1.4 V above the egative supply, this limits how much the output ca be offset for a give referece voltage. For example, it is ot possible to have a uipolar output rage of 20 V because the maximum supply voltage is ±16.5 V. SIGGND R4 60kΩ OFFSET DAC DAC CHANNEL R3 20kΩ R5 60kΩ R1 20kΩ R2 20kΩ S2 CLR S1 CLR R6 10kΩ S3 SIGGND Figure 23. Output Amplifier ad Offset DAC OUTPUT Figure 23 shows details of a DAC output amplifier ad its coectios to the offset DAC. O power-up, S1 is ope, discoectig the amplifier from the output. S3 is closed, so the output is pulled to SIGGND. S2 is also closed to prevet the output amplifier from beig ope-loop. If CLR is low at power-up, the output remais i this coditio util CLR is take high. The DAC registers ca be programmed, ad the outputs assume the programmed values whe CLR is take high. Eve if CLR is high at power-up, the output remais i this coditio util VDD > 6 V ad VSS < 4 V ad the iitializatio sequece has fiished. The outputs the go to their power-o default values. TRANSFER FUNCTION The output voltage of a DAC i the AD5360/AD5361 is depedet o the value i the iput register, the value of the M ad C registers, ad the value i the offset DAC. The trasfer fuctios for the AD5360/AD5361 are show i the followig sectios. AD5360 Trasfer Fuctio The iput code is the value i the X1A or X1B register that is applied to DAC (X1A, X1B default code = 32,768) DAC_CODE = INPUT_CODE (M + 1)/ C 2 15 DAC output voltage VOUT = 4 VREF (DAC_CODE (OFFSET_CODE 4))/ VSIGGND where: DAC_CODE should be withi the rage of 0 to 65,535. VREF = 3.0 V, for a 12 V spa. VREF = 5.0 V, for a 20 V spa. M = code i gai register default code = C = code i offset register default code = CLR OFFSET_CODE is the code loaded to the offset DAC. It is multiplied by 4 i the trasfer fuctio because this DAC is a 14-bit device. O power-up, the default code loaded to the offset DAC is 8192 (0x2000). With a 10 V referece, this gives a spa of 10 V to +10 V. AD5361 Trasfer Fuctio The iput code is the value i the X1A or X1B register that is applied to DAC (X1A, X1B default code = 8192) DAC_CODE = INPUT_CODE (M + 1)/ C 2 13 DAC output voltage VOUT = 4 VREF (DAC_CODE OFFSET_CODE)/ VSIGGND where: DAC_CODE should be withi the rage of 0 to 16,383. VREF = 3.0 V, for a 12 V spa. VREF = 5.0 V, for a 20 V spa. M = code i gai register default code = C = code i offset register default code = OFFSET_CODE is the code loaded to the offset DAC. O power-up, the default code loaded to the offset DAC is 8192 (0x2000). With a 5 V referece, this gives a spa of 10 V to +10 V. REFERENCE SELECTION The AD5360/AD5361 have two referece iput pis. The voltage applied to the referece pis determies the output voltage spa o VOUT0 to VOUT15. VREF0 determies the voltage spa for VOUT0 to VOUT7 (Group 0), ad VREF1 determies the voltage spa for VOUT8 to VOUT15 (Group 1). The referece voltage applied to each VREF pi ca be differet, if required, allowig each group of eight chaels to have a differet voltage spa. The output voltage rage ad spa ca be adjusted by programmig the offset register ad gai register for each chael as well as programmig the offset DAC. If the offset ad gai features are ot used (that is, the M ad C registers are left at their default values), the required referece levels ca be calculated as follows: VREF = (VOUTMAX VOUTMIN)/4 If the offset ad gai features of the AD5360/AD5361 are used, the required output rage is slightly differet. The chose output rage should take ito accout the system offset ad gai errors that eed to be trimmed out. Therefore, the chose output rage should be larger tha the actual, required rage. The required referece levels ca be calculated as follows: 1. Idetify the omial output rage o VOUT. 2. Idetify the maximum offset spa ad the maximum gai required o the full output sigal rage. 3. Calculate the ew maximum output rage o VOUT, icludig the expected maximum offset ad gai errors. Rev. A Page 17 of 28
19 4. Choose the ew required VOUTMAX ad VOUTMIN, keepig the VOUT limits cetered o the omial values. Note that VDD ad VSS must provide sufficiet headroom. 5. Calculate the value of VREF as follows: VREF = (VOUTMAX VOUTMIN)/4 Referece Selectio Example Nomial output rage = 20 V ( 10 V to +10 V) Offset error = ±100 mv Gai error = ±3% SIGGND = AGND = 0 V Gai error = ±3% Maximum positive gai error = +3% Output rage icludig gai error = (20) = 20.6 V Offset error = ±100 mv Maximum offset error spa = 2 (100 mv) = 0.2 V Output rage icludig gai error ad offset error = 20.6 V V = 20.8 V VREF calculatio Actual output rage = 20.6 V, that is, 10.3 V to V (cetered); VREF = (10.3 V V)/4 = 5.15 V If the solutio yields a icoveiet referece level, the user ca adopt oe of the followig approaches: Use a resistor divider to divide dow a coveiet, higher referece level to the required level. Select a coveiet referece level above VREF ad modify the gai ad offset registers to digitally dowsize the referece. I this way, the user ca use almost ay coveiet referece level but may reduce the performace by overcompactio of the trasfer fuctio. Use a combiatio of these two approaches. CALIBRATION The user ca perform a system calibratio o the AD5360 ad AD5361 to reduce gai ad offset errors to below 1 LSB. This is achieved by calculatig ew values for the M ad C registers ad reprogrammig them. Reducig Zero-Scale ad Full-Scale Error Zero-scale error ca be reduced as follows: 1. Set the output to the lowest possible value. 2. Measure the actual output voltage ad compare it with the required value. This gives the zero-scale error. 3. Calculate the umber of LSBs equivalet to the error ad add this from the default value of the C register. Note that oly egative zero-scale error ca be reduced. Full-scale error ca be reduced as follows: 1. Measure the zero-scale error. 2. Set the output to the highest possible value. 3. Measure the actual output voltage ad compare it with the required value. Add this error to the zero-scale error. This is the spa error, which icludes full-scale error. 4. Calculate the umber of LSBs equivalet to the spa error ad subtract it from the default value of the M register. Note that oly positive full-scale error ca be reduced. The M ad C registers should ot be programmed util both zero-scale errors ad full-scale errors have bee calculated. AD5360 Calibratio Example This example assumes that a 10 V to +10 V output is required. The DAC output is set to 10 V but is measured at V. This gives a zero-scale error of 30 mv. 1 LSB = 20 V/65,536 = μv 30 mv = 98 LSBs The full-scale error ca ow be removed. The output is set to +10 V, ad a value of V is measured. The full-scale error is +20 mv. The spa error is +20 mv ( 30 mv) = +50 mv. +50 mv = 164 LSBs The errors ca ow be removed LSBs should be added to the default C register value; (32, ) = 32, ,866 should be programmed to the C register LSBs should be subtracted from the default M register value; (65, ) = 65, ,371 should be programmed to the M register. Additioal Calibratio The techiques described i the previous sectio are usually eough to reduce the zero-scale errors ad full-scale errors i most applicatios. However, there are limitatios whereby the errors may ot be sufficietly removed. For example, the offset (C) register ca oly be used to reduce the offset caused by the egative zero-scale error. A positive offset caot be reduced. Likewise, if the maximum voltage is below the ideal value, that is, a egative full-scale error, the gai (M) register caot be used to icrease the gai to compesate for the error. These limitatios ca be overcome by icreasig the referece value. With a 2.5 V referece, a 10 V spa is achieved. The ideal voltage rage, for the AD5360 or AD5361, is 5 V to +5 V. Usig a 2.6 V referece icreases the rage to 5.2 V to +5.2 V. Clearly, i this case, the offset ad gai errors are isigificat ad the M ad C registers ca be used to raise the egative voltage to 5 V ad the reduce the maximum voltage dow to +5 V to give the most accurate values possible. Rev. A Page 18 of 28
20 RESET FUNCTION The reset fuctio is iitiated by the RESET pi. O the risig edge of RESET, the AD5360/AD5361 state machie iitiates a reset sequece to reset the X, M, ad C registers to their default values. This sequece typically takes 300 μs, ad the user should ot write to the part durig this time. O power-up, it is recommeded that the user brig RESET high as soo as possible to properly iitialize the registers. Whe the reset sequece is complete (ad provided that CLR is high), the DAC output is at a potetial specified by the default register settigs, which are equivalet to SIGGNDx. The DAC outputs remai at SIGGNDx util the X, M, or C register is updated ad LDAC is take low. The AD5360/AD5361 ca be retured to the default state by pulsig RESET low for at least 30 s. Note that, because the reset fuctio is risig edge triggered, brigig RESET low has o effect o the operatio of the AD5360/AD5361. CLEAR FUNCTION CLR is a active low iput that should be high for ormal operatio. The CLR pi has a iteral 500 kω pull-dow resistor. Whe CLR is low, the iput to each of the DAC output buffer stages (VOUT0 to VOUT15) is switched to the exterally set potetial o the relevat SIGGNDx pi. While CLR is low, all LDAC pulses are igored. Whe CLR is take high agai, the DAC outputs retur to their previous values. The cotets of iput registers ad DAC Register 0 to DAC Register 15 are ot affected by takig CLR low. To prevet glitches appearig o the outputs, CLR should be brought low wheever the output spa is adjusted by writig to the offset DAC. BUSY AND LDAC FUNCTIONS The value of a X2 (A or B) register is calculated each time the user writes ew data to the correspodig X1, C, or M register. Durig the calculatio of X2, the BUSY output goes low. While BUSY is low, the user ca cotiue writig ew data to the X1, M, or C register (see the Register Update Rates sectio for more details), but o DAC output updates ca take place. The BUSY pi is bidirectioal ad has a 50 kω iteral pull-up resistor. Whe multiple AD5360 or AD5361 devices may be used i oe system, the BUSY pis ca be tied together. This is useful whe it is required that o DAC i ay device be updated util all other DACs are ready. Whe each device has fiished updatig the X2 (A or B) register, it releases the BUSY pi. If aother device has ot fiished updatig its X2 registers, it holds BUSY low, thus delayig the effect of LDAC goig low. The DAC outputs are updated by takig the LDAC iput low. If LDAC goes low while BUSY is active, the LDAC evet is stored ad the DAC outputs update immediately after BUSY goes high. A user ca also hold the LDAC iput permaetly low. I this case, the DAC outputs update immediately after BUSY goes high. Wheever the A/B select registers are writte to, BUSY also goes low, for approximately 600 s. The AD5360/AD5361 have flexible addressig that allows writig of data to a sigle chael, all chaels i a group, the same chael i Group 0 ad Group 1, or all chaels i the device. This meas that 1, 2, 8, or 16 DAC register values may eed to be calculated ad updated. Because there is oly oe multiplier shared amog 16 chaels, this task must be doe sequetially, so the legth of the BUSY pulse varies accordig to the umber of chaels beig updated. Table 8. BUSY Pulse Widths Actio BUSY Pulse Width 1 Loadig Iput, C, or M to 1 Chael μs maximum Loadig Iput, C, or M to 2 Chaels 2.1 μs maximum Loadig Iput, C, or M to 8 Chaels 5.7 μs maximum Loadig Iput, C, or M to 16 Chaels 10.5 μs maximum 1 BUSY pulse width = ((umber of chaels + 1) 600 s) s. 2 A sigle chael update is typically 1 μs. The AD5360/AD5361 cotai a extra feature whereby a DAC register is ot updated uless its X2A or X2B register has bee writte to sice the last time LDAC was brought low. Normally, whe LDAC is brought low, the DAC registers are filled with the cotets of the X2A or X2B registers, depedig o the settig of the A/B select register. However, the AD5360/ AD5361 update the DAC register oly if the X2A or X2B data has chaged, thereby removig uecessary digital crosstalk. BIN/2SCOMP PIN The BIN/2SCOMP pi determies if the output data is preseted as offset biary or twos complemet. If this pi is low, the data is straight biary. If it is high, the data is twos complemet. This affects oly the X, C, ad offset DAC registers; the M register ad the cotrol ad commad data are iterpreted as straight biary. TEMPERATURE SENSOR The o-chip temperature sesor provides a voltage output at the TEMP_OUT pi that is liearly proportioal to the Cetigrade temperature scale. The typical accuracy of the temperature sesor is ±1 C at +25 C ad ±5 C over the 40 C to +85 C rage. Its omial output voltage is 1.46 V at +25 C, varyig at 4.4 mv/ C. Its low output impedace, low selfheatig, ad liear output simplify iterfacig to temperature cotrol circuitry ad aalog-to-digital coverters. Rev. A Page 19 of 28
21 MONITOR FUNCTION The AD5360/AD5361 cotai a chael moitor fuctio that cosists of a aalog multiplexer addressed via the serial iterface, allowig ay chael output to be routed to this pi for moitorig usig a exteral ADC. I additio, two moitor iputs, MON_IN0 ad MON_IN1, are provided, which ca also be routed to MON_OUT. The moitor fuctio is cotrolled by the moitor register, which allows the moitor output to be eabled or disabled, ad selectio of a DAC chael or oe of the moitor pis. Whe disabled, the moitor output is high impedace, so several moitor outputs ca be coected i parallel ad oly oe eabled at a time. Table 9 shows the cotrol register settigs relevat to the moitor fuctio. Table 9. Cotrol Register Moitor Fuctios F5 F4 F3 F2 F1 F0 Fuctio 0 X X X X X MON_OUT disabled 1 X X X X X MON_OUT eabled MON_OUT = VOUT MON_OUT = VOUT MON_OUT = VOUT MON_OUT = MON_IN MON_OUT = MON_IN1 The multiplexer is implemeted as a series of aalog switches. Because this could coceivably cause a large amout of curret to flow from the iput of the multiplexer, that is, VOUTx or MON_INx to the output of the multiplexer, MON_OUT, care should take to esure that whatever is coected to the MON_OUT pi is of high eough impedace to prevet the cotiuous curret limit specificatio from beig exceeded. Because the MON_OUT pi is ot buffered, the amout of curret draw from this pi creates a voltage drop across the switches, which i tur leads to a error i the voltage beig moitored. Where accuracy is importat, it is recommeded that the MON_OUT pi be buffered. Figure 20 shows the typical error due to the MON_OUT curret GPIO PIN The AD5360/AD5361 have a geeral-purpose I/O pi, GPIO. This ca be cofigured as a iput or a output ad read back or programmed (whe cofigured as a output) via the serial iterface. Typical applicatios for this pi iclude moitorig the status of a logic sigal, moitorig a limit switch, or cotrollig a exteral multiplexer. The GPIO pi is cofigured by writig to the GPIO register, which has the special fuctio code of (see Table 14 ad Table 15 ). Whe Bit F1 is set, the GPIO pi becomes a output ad F0 determies whether the pi is high or low. The GPIO pi ca be set as a iput by writig 0 to both F1 ad F0. The status of the GPIO pi ca be determied by iitiatig a read operatio usig the appropriate bits i Table 16. The status of the pi is idicated by the LSB of the register read. POWER-DOWN MODE The AD5360/AD5361 ca be powered dow by settig Bit 0 i the cotrol register to 1. This turs off the DACs, thus reducig the curret cosumptio. The DAC outputs are coected to their respective SIGGND potetials. The power-dow mode does ot chage the cotets of the registers, ad the DACs retur to their previous voltage whe the power-dow bit is cleared to 0. THERMAL MONITORING FUNCTION The AD5360/AD5361 ca be programmed to power dow the DACs if the temperature o the die exceeds 130 C. Settig Bit 1 i the cotrol register to 1 (see Table 15) eables this fuctio. If the die temperature exceeds 130 C, the AD5360/AD5361 eter a temperature power-dow mode, which is equivalet to settig the power-dow bit i the cotrol register. To idicate that the AD5360/AD5361 have etered temperature shutdow mode, Bit 4 of the cotrol register is set to 1. The AD5360/AD5361 remai i temperature shutdow mode, eve if the die temperature falls, util Bit 1 i the cotrol register is cleared to 0. TOGGLE MODE The AD5360/AD5361 have two X2 registers per chael, X2A ad X2B, which ca be used to switch the DAC output betwee two levels with ease. This approach greatly reduces the overhead required by a microprocessor, which would otherwise have to write to each chael idividually. Whe the user writes to either the X1A, X2A, M, or C register, the calculatio egie takes a certai amout of time to calculate the appropriate X2A or X2B values. If the applicatio oly requires that the DAC output switch betwee two levels, such as a data geerator, ay method that reduces the amout of calculatio time ecoutered is advatageous. For the data geerator example, the user should set the high ad low levels for each chael oce, by writig to the X1A ad X1B registers. The values of X2A ad X2B are calculated ad stored i their respective registers. The calculatio delay, therefore, oly happes durig the setup phase, that is, whe programmig the iitial values. To toggle a DAC output betwee the two levels, it is oly required to write to the relevat A/B select register to set the MUX 2 register bit. Furthermore, because there are eight MUX 2 cotrol bits per register, it is possible to update eight chaels with a sigle write. Table 17 shows the bits that correspod to each DAC output. Rev. A Page 20 of 28
22 SERIAL INTERFACE The AD5360/AD5361 cotai a high speed SPI operatig at clock frequecies up to 50 MHz (20 MHz for read operatios). To miimize both the power cosumptio of the device ad o-chip digital oise, the iterface powers up fully oly whe the device is beig writte to, that is, o the fallig edge of SYNC. The serial iterface is 2.5 V LVTTL-compatible whe operatig from a 2.5 V to 3.6 V DVCC supply. It is cotrolled by four pis: SYNC (frame sychroizatio iput), SDI (serial data iput), SCLK (clockig of data i ad out of the device), ad SDO (serial data output for data readback). SPI WRITE MODE The AD5360/AD5361 allow writig of data via the serial iterface to every register directly accessible to the serial iterface, which are all registers except the X2A, X2B, ad DAC registers. The X2A ad X2B registers are updated whe writig to the X1A, X1B, M, ad C registers, ad the DAC registers are updated by LDAC. The serial word (see Table 10 or Table 11) is 24 bits log; 16 or 14 of these bits are data bits, six bits are address bits, ad two bits are mode bits that determie what is doe with the data. Two bits are reserved o the AD5361. The serial iterface works with both a cotiuous ad a burst (gated) serial clock. Serial data applied to SDI is clocked ito the AD5360/AD5361 by clock pulses applied to SCLK. The first fallig edge of SYNC starts the write cycle. At least 24 fallig clock edges must be applied to SCLK to clock i 24 bits of data, before SYNC is take high agai. If SYNC is take high before the 24th fallig clock edge, the write operatio is aborted. If a cotiuous clock is used, SYNC must be take high before the 25th fallig clock edge. This ihibits the clock withi the AD5360/AD5361. If more tha 24 fallig clock edges are applied before SYNC is take high agai, the iput data is corrupted. If a exterally gated clock of exactly 24 pulses is used, SYNC may be take high ay time after the 24th fallig clock edge. The iput register addressed is updated o the risig edge of SYNC. For aother serial trasfer to take place, SYNC must be take low agai. Table 10. AD5360 Serial Word Bit Assigatio I23 I22 I21 I20 I19 I18 I17 I16 I15 I14 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0 M1 M0 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Table 11. AD5361 Serial Word Bit Assigatio I23 I22 I21 I20 I19 I18 I17 I16 I15 I14 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 1 I0 1 M1 M0 A5 A4 A3 A2 A1 A0 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D I1 ad I0 are reserved for future use ad should be 0 whe writig the serial word. These bits read back as 0. Rev. A Page 21 of 28
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