TABLE OF CONTENTS Features... Applications... Pin Configurations... General Description... Revision History... 2 Specifications... 3 Absolute Maximum

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1 FEATURES Offset voltage: 2.5 mv maximum Single-supply operation: 2.7 V to 5.5 V Low noise: 8 nv/ Hz Wide bandwidth: 24 MHz Slew rate: V/μs Short-circuit output current: 2 ma No phase reversal Low input bias current: pa Low supply current per amplifier: 2 ma maximum Unity gain stable 24 MHz Rail-to-Rail Amplifiers with Shutdown Option AD8646/AD8647/AD8648 PIN CONFIGURATIONS APPLICATIONS Figure 2. -Lead MSOP Battery-powered instruments Multipole filters ADC front ends OUTA INA OUTD IND +INA 3 AD IND Sensors TOP VIEW V+ 4 V Barcode scanners (Not to Scale) ASIC input or output amplifiers +INB 5 +INC INB 6 9 Audio amplifiers INC OUTB 7 8 OUTC Photodiode amplifiers Datapath/mux/switch control Figure 3. 4-Lead SOIC and TSSOP OUTA INA 2 +INA 3 V 4 AD8646 TOP VIEW (Not to Scale) 8 V+ 7 OUTB 6 INB 5 +INB Figure. 8-Lead SOIC and MSOP OUTA INA 2 +INA 3 V 4 SDA 5 AD8647 TOP VIEW (Not to Scale) V+ 9 OUTB 8 INB 7 +INB 6 SDB GENERAL DESCRIPTION The AD8646 and the AD8647 are the dual, and the AD8648 is the quad, rail-to-rail, input and output, single-supply amplifiers featuring low offset voltage, wide signal bandwidth, low input voltage, and low current noise. The AD8647 also has a low power shutdown function. The combination of 24 MHz bandwidth, low offset, low noise, and very low input bias current makes these amplifiers useful in a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from the combination of performance features. AC applications benefit from the wide bandwidth and low distortion. TheAD8646/ AD8647/AD8648 offer high output drive capability, which is excellent for audio line drivers and other low impedance applications. Applications include portable and low powered instrumentation, audio amplification for portable devices, portable phone headsets, barcode scanners, and multipole filters. The ability to swing rail to rail at both the input and output enables designers to buffer CMOS ADCs, DACs, ASICs, and other wide output swing devices in single-supply systems. Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 96, Norwood, MA , U.S.A. Tel: Fax: Analog Devices, Inc. All rights reserved.

2 TABLE OF CONTENTS Features... Applications... Pin Configurations... General Description... Revision History... 2 Specifications... 3 Absolute Maximum Ratings... 6 Thermal Resistance... 6 ESD Caution...6 Typical Performance Characteristics...7 Theory of Operation... 5 Power-Down Operation... 5 Multiplexing Operation... 5 Outline Dimensions... 6 Ordering Guide... 8 REVISION HISTORY Revision History: AD8646/AD8647/AD8648 /7 Revision B: Initial Combined Version Deleted Figure Deleted Figure...7 Deleted Figure 6 and Figure Deleted Figure Deleted Figure 27, Figure 28, Figure 3, and Figure Revision History: AD8646 /7 Rev. to Rev. B Combined with AD Universal 6/7 Rev. to Rev. A Added AD Universal Changes to General Description... Deleted Figure 4 and Figure Updated Outline Dimensions... 2 Deleted Figure Changes to Ordering Guide /7 Revision : Initial Version /6 Revision : Initial Version Revision History: AD8648 /7 Rev. A to Rev. B Combined with AD Universal Added AD Universal Rev. B Page 2 of 2

3 SPECIFICATIONS VSY = 5 V, VCM = VSY/2, TA = +25 o C, unless otherwise noted. Table. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS VCM = V to 5V mv 4 C < TA < +25 C 3.2 mv Offset Voltage Drift ΔVOS/ΔT 4 C < TA < +25 C μv/ C Input Bias Current IB.3 pa 4 C < TA < +85 C 5 pa 4 C < TA < +25 C 55 pa Input Offset Current IOS..5 pa 4 C < TA < +85 C 5 pa 4 C < TA < +25 C 25 pa Input Voltage Range VCM 5 V Common-Mode Rejection Ratio CMRR VCM = V to 5 V db Large Signal Voltage Gain AVO RL = 2 kω, VO =.5 V to 4.5 V 4 6 db Input Capacitance Differential CDIFF 2.5 pf Common Mode CCM 6.7 pf OUTPUT CHARACTERISTICS Output Voltage High VOH IOUT = ma V 4 C < TA < +25 C 4.9 V IOUT = ma V 4 C < TA < +25 C 4.7 V Output Voltage Low VOL IOUT = ma mv 4 C < TA < +25 C 4 mv IOUT = ma mv 4 C < TA < +25 C 2 mv Output Current Isc Short circuit ±2 ma Closed-Loop Output Impedance ZOUT At MHz, AV = 5 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VSY = 2.7 V to 5.5 V 63 8 db Supply Current per Amplifier ISY.5 2. ma 4 C < TA < +25 C 2.5 ma Supply Current Shutdown Mode (AD8647) ISD Shutdown of both amplifiers (AD8647 only) na 4 C < TA < +25 C μa SHUTDOWN INPUTS (AD8647) Logic High Voltage (Enabled) VINH 4 C < TA < +25 C +2. V Logic Low Voltage (Power-Down) VINL 4 C < TA < +25 C +.8 V Logic Input Current (Per Pin) IIN 4 C < TA < +25 C μa Output Pin Leakage Current 4 C < TA < +25 C (shutdown active) na DYNAMIC PERFORMANCE Slew Rate SR RL = 2 kω V/μs Gain Bandwidth Product GBP 24 MHz Phase Margin Øm 74 Degrees Settling Time ts To.%.5 μs Amplifier Turn-On Time (AD8647) ton 25 C, AV =, RL = kω (see Figure 44) μs Amplifier Turn-Off Time (AD8647) toff 25 C, AV =, RL = kω (see Figure 45) μs Rev. B Page 3 of 2

4 AD8646/AD8647/AD8648 Parameter Symbol Conditions Min Typ Max Unit NOISE PERFORMANCE Peak-to-Peak Noise en p-p. Hz to Hz 2.3 μv Voltage Noise Density en f = khz 8 nv/ Hz f = khz 6 nv/ Hz Channel Separation CS f = khz 5 db f = khz db Total Harmonic Distortion Plus Noise THD + N V p-p =. V, RL = 6 Ω, f = 25 khz, TA = 25 C AV = +. % AV =.2 % Rev. B Page 4 of 2

5 VSY = 2.7 V, VCM = VSY/2, TA = +25 o C, unless otherwise noted. Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS VCM = V to 2.7 V mv 4 C < TA < +25 C 3.2 mv Offset Voltage Drift ΔVOS/ΔT 4 C < TA < +25 C.8 7. μv/ C Input Bias Current IB.2 pa 4 C < TA < +85 C 5 pa 4 C < TA < +25 C 55 pa Input Offset Current IOS..5 pa 4 C < TA < +85 C 5 pa 4 C < TA < +25 C 25 pa Input Voltage Range VCM 2.7 V Common-Mode Rejection Ratio CMRR VCM = V to 2.7 V db Large Signal Voltage Gain AVO RL = 2 kω, VO =.5 V to 2.2 V 95 2 db Input Capacitance Differential CDIFF 2.5 pf Common Mode CCM 7.8 pf OUTPUT CHARACTERISTICS Output Voltage High VOH IOUT = ma V 4 C < TA < +25 C 2.6 V Output Voltage Low VOL IOUT = ma 25 mv 4 C < TA < +25 C 3 mv Output Current IOUT Short circuit ±63 ma Closed-Loop Output Impedance ZOUT At MHz, AV = 5 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VSY = 2.7 V to 5.5 V 63 8 db Supply Current per Amplifier ISY.6 2. ma 4 C < TA < +25 C 2.5 ma Supply Current Shutdown Mode (AD8647) ISD Shutdown of both amplifiers (AD8647 only) na 4 C < TA < +25 C μa SHUTDOWN INPUTS (AD8647) Logic High Voltage (Enabled) VINH 4 C < TA < +25 C +2. V Logic Low Voltage (Power-Down) VINL 4 C < TA < +25 C +.8 V Logic Input Current (Per Pin) VIN 4 C < TA < +25 C μa Output Pin Leakage Current 4 C < TA < +25 C (shutdown active) na DYNAMIC PERFORMANCE Slew Rate SR RL = 2 kω V/μs Gain Bandwidth Product GBP 24 MHz Phase Margin Øm 53 Degrees Settling Time ts To.%.3 μs Amplifier Turn-On Time (AD8647) ton 25 C, AV =, RL = kω (see Figure 4).2 μs Amplifier Turn-Off Time (AD8647) toff 25 C, AV =, RL = kω (see Figure 42) μs NOISE PERFORMANCE Peak-to-Peak Noise en p-p. Hz to Hz 2.3 μv Voltage Noise Density en f = khz 8 nv/ Hz f = khz 6 nv/ Hz Channel Separation CS f = khz 5 db f = khz db Rev. B Page 5 of 2

6 AD8646/AD8647/AD8648 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating Supply Voltage 6 V Input Voltage GND to VSY Differential Input Voltage ±3 V Output Short Circuit to GND Indefinite Storage Temperature Range 65 C to +5 C Operating Temperature Range 4 C to +25 C Lead Temperature (Soldering 6 sec) 3 C Junction Temperature 5 C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE θja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 4. Thermal Resistance Package Type θja θjc Unit 8-Lead SOIC_N C/W 8-Lead MSOP 2 45 C/W -Lead MSOP 2 44 C/W 4-Lead SOIC_N 2 36 C/W 4-Lead TSSOP 8 35 C/W ESD CAUTION Rev. B Page 6 of 2

7 TYPICAL PERFORMANCE CHARACTERISTICS 3 25 V CM =.35V 2244 AMPLIFIERS V CM = 2.5V 2244 AMPLIFIERS AD8646/AD8647/AD8648 NUMBER OF AMPLIFIERS 2 5 NUMBER OF AMPLIFIERS V OS (mv) V OS (mv) Figure 4. Input Offset Voltage Distribution Figure 7. Input Offset Voltage Distribution C < T A < +25 C C < T A < +25 C NUMBER OF AMPLIFIERS 25 NUMBER OF AMPLIFIERS TCV OS (µv/ C) TCV OS (µv/ C) Figure 5. VOS Drift (TCVOS) Distribution Figure 8. VOS Drift (TCVOS) Distribution V SY =5V T A =25 C INPUT OFFSET VOLTAGE (µv) INPUTOFFSETVOLTAGE(µV) INPUT COMMON-MODE VOLTAGE (V) Figure 6. Input Offset Voltage vs. Input Common-Mode Voltage INPUT COMMON-MODE VOLTAGE (V) Figure 9. Input Offset Voltage vs. Input Common-Mode Voltage Rev. B Page 7 of 2

8 OUTPUT SATURATION VOLTAGE (mv) V OL V SY V OH OUTPUT SATURATION VOLTAGE (mv) V SY V OH.... LOAD CURRENT (ma) Figure. Output Saturation Voltage vs. Load Current V OL.... LOAD CURRENT (ma) Figure 3. Output Saturation Voltage vs. Load Current OUTPUT SATURATION VOLTAGE (mv) I L = ma V SY V OH OUTPUT SATURATION VOLTAGE (mv) V SY V OH = ma V OL = ma V OL 4 2 V SY V OH = ma TEMPERATURE ( C) Figure. Output Saturation Voltage vs. Temperature V OL = ma TEMPERATURE ( C) Figure 4. Output Saturation Voltage vs. Temperature T A = 25 C 3 25 T A = 25 C INPUT BIAS CURRENT (pa) 2 5 INPUT BIAS CURRENT (pa) COMMON-MODE VOLTAGE (V) Figure 2. Input Bias Current vs. Common-Mode Voltage COMMON-MODE VOLTAGE (V) Figure 5. Input Bias Current vs. Common-Mode Voltage Rev. B Page 8 of 2

9 OPEN-LOOP GAIN (db) Ф M = 52 R L = kω C L = pf OPEN-LOOP PHASE SHIFT (Degrees) OPEN-LOOP GAIN (db) GAIN PHASE Ф M = 74 R L = kω C L = pf OPEN-LOOP PHASE SHIFT (Degrees) 4 k 27 k M M M Figure 6. Open-Loop Gain and Phase vs. Frequency k k M M M Figure 9. Open-Loop Gain and Phase vs. Frequency A V = 6 4 A V = CLOSED-LOOP GAIN (db) A V = A V = CLOSED-LOOP GAIN (db) A V = 2 A V = k k k M M M Figure 7. Closed-Loop Gain vs. Frequency k k k M M M Figure 2. Closed-Loop Gain vs. Frequency Z OUT (Ω) A V = A V = A V = Z OUT (Ω) A V = A V = A V = k k k M FREQUENCY (khz) Figure 8. ZOUT vs. Frequency k k k M FREQUENCY (khz) Figure 2. ZOUT vs. Frequency Rev. B Page 9 of 2

10 8 8 CMRR (db) 6 4 CMRR (db) k k k M Figure 22. CMRR vs. Frequency M M k k k M Figure 25. CMRR vs. Frequency M M PSRR+ PSRR+ 8 8 PSRR PSRR (db) PSRR PSRR (db) k k k M Figure 23. PSRR vs. Frequency M k k k M Figure 26. PSRR vs. Frequency M V SY = ±.35V OS 7 6 R L = kω OVERSHOOT (%) OS OVERSHOOT (%) OS+ OS C LOAD (pf) Figure 24. Overshoot vs. Load Capacitance C LOAD (pf) Figure 27. Overshoot vs. Load Capacitance Rev. B Page of 2

11 , V CM =.35V, V IN = mv p-p,, R L = kω, C L = pf, V CM = 2.5V, V IN = mv p-p,, R L = kω, C L = pf (5mV/DIV) (2ns/DIV) Figure 28. Small-Signal Transient Response , V IN = 2V p-p,, R L = kω, C L = pf (2V/DIV) (5mV/DIV) (2ns/DIV) Figure 3. Small-Signal Transient Response, V IN = 4V p-p,, R L = kω, C L = pf (2V/DIV) (2ns/DIV) (2ns/DIV) Figure 29. Large-Signal Transient Response Figure 32. Large-Signal Transient Response V SY = ±2.5V R L = 6Ω A V = V SY = ±2.5V R L = 6Ω A V = THD + N (%) THD + N (%) k k k Figure 3. THD + Noise vs. Frequency k k k Figure 33. THD + Noise vs. Frequency Rev. B Page of 2

12 TO 5V. VOLTAGE (µv/div) THD + N (%). TIME (s/div) Figure 34.. Hz to Hz Voltage Noise A V = BW = 3kHz R L = kω f = khz.... OUTPUT AMPLITUDE (V rms) Figure 37. THD + Noise vs. Output Amplitude TO 5V VOLTAGE NOISE DENSITY (nv/ Hz) INPUT BIAS CURRENT (pa) k k Figure 35. Voltage Noise Density vs. Frequency TEMPERATURE ( C) Figure 38. Input Bias Current vs. Temperature SUPPLY CURRENT PER AMPLIFIER (ma) OUTPUT SWING (V p-p) V IN = 4.9V A V = R L = kω SUPPLY VOLTAGE (V) Figure 36. Supply Current per Amplifier vs. Supply Voltage k k FREQUENCY (khz) Figure 39. Maximum Output Swing vs. Frequency Rev. B Page 2 of 2

13 SUPPLY CURRENT PER AMPLIFIER (ma) V OUT = V SY /2 CHANNEL SEPARATION (db) R L = 2kΩ A V = CS (db) = 2 log (V OUT / = V IN ) V+ V IN U V+ V V R3 2kΩ 5 V IN = 2V p-p R 2Ω V U2 V V+ V+ 6 7 R2 2Ω TEMPERATURE ( C) V IN =.5V p-p 2 k k k Figure 4. Supply Current per Amplifier vs. Temperature Figure 43. Channel Separation VOLTAGE (V/DIV) SHUTDOWN PIN R L = kω A V = VOLTAGE (V/DIV) R L = kω A V = SHUTDOWN PIN AMPLIFIER OUTPUT AMPLIFIER OUTPUT TIME (2ns/DIV) TIME (2ns/DIV) Figure 4. Turn-On Time Figure 44. Turn-On Time R L = kω A V = R L = kω A V = VOLTAGE (V/DIV) SHUTDOWN PIN VOLTAGE (V/DIV) SHUTDOWN PIN AMPLIFIER OUTPUT AMPLIFIER OUTPUT TIME (2ns/DIV) TIME (2ns/DIV) Figure 42. Turn-Off Time Figure 45. Turn-Off Time Rev. B Page 3 of 2

14 AD8646/AD8647/AD8648 I SY (na) I SY (na) TEMPERATURE ( C) Figure 46. Supply Current with Op-Amp Shutdown vs. Temperature TEMPERATURE ( C) Figure 47. Supply Current with Op-Amp Shutdown vs. Temperature Rev. B Page 4 of 2

15 THEORY OF OPERATION POWER-DOWN OPERATION The shutdown function of the AD8647 is referenced to the negative supply voltage of the operational amplifier. A logic level high (> 2. V) enables the device, while a logic level low (<.8 V) disables the device and places the output in a high impedance condition. Several outputs can be wire-or ed, thus eliminating a multiplexer. The logic input is a high impedance CMOS input. If dual or split supplies are used, the logic signals must be properly referred to the negative supply voltage. MULTIPLEXING OPERATION Because each op amp has a separate logic input enable pin, the outputs can be connected together if it can be guaranteed that only one op amp is active at any time. By connecting the op amps as shown in Figure 48, a multiplexer can be eliminated. With the reasonably short turn-on and turn-off times, low frequency signal paths can be smoothly selected. The turn-off time is slightly faster than the turn-on time so, even when using sections from two different packages, the overlap is less than 3 nanoseconds. 2V V /2 8 AD kHz 5V /2 AD kHz 4 2 2kHz Figure 48. AD8647 Output Switching V 5V V TIME (2µs/DIV) Figure 49. Switching Waveforms Rev. B Page 5 of 2

16 OUTLINE DIMENSIONS 5. (.968) 4.8 (.89) 4. (.574) 3.8 (.497) (.244) 5.8 (.2284).25 (.98). (.4) COPLANARITY. SEATING PLANE.27 (.5) BSC.75 (.688).35 (.532).5 (.2).3 (.22) 8.25 (.98).7 (.67).5 (.96).25 (.99).27 (.5).4 (.57) 45 COMPLIANT TO JEDEC STANDARDS MS-2-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 5. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 247-A PIN.65 BSC COPLANARITY.. MAX SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-87-AA Figure 5. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev. B Page 6 of 2

17 PIN.5 BSC COPLANARITY.. MAX SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-87-BA Figure 52. Lead Mini Small Outline Package [MSOP] (RM-) Dimensions shown in millimeters BSC PIN BSC MAX SEATING PLANE.2.9 COPLANARITY. 8 COMPLIANT TO JEDEC STANDARDS MO-53-AB- Figure Lead Thin Shrink Small Outline Package [TSSOP] (RU-4) Dimensions shown in millimeters Rev. B Page 7 of 2

18 8.75 (.3445) 8.55 (.3366) 4. (.575) 3.8 (.496) (.244) 5.8 (.2283).25 (.98). (.39) COPLANARITY..27 (.5) BSC.5 (.2).3 (.22).75 (.689).35 (.53) SEATING PLANE 8.25 (.98).7 (.67).5 (.97).25 (.98).27 (.5).4 (.57) 45 COMPLIANT TO JEDEC STANDARDS MS-2-AB CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-4) Dimensions shown in millimeters and (inches) 666-A ORDERING GUIDE Model Temperature Range Package Description Package Option Branding AD8646ARZ 4 C to +25 C 8-Lead SOIC_N R-8 AD8646ARZ-REEL 4 C to +25 C 8-Lead SOIC_N R-8 AD8646ARZ-REEL7 4 C to +25 C 8-Lead SOIC_N R-8 AD8646ARMZ-R2 4 C to +25 C 8-Lead MSOP RM-8 AV AD8646ARMZ-REEL 4 C to +25 C 8-Lead MSOP RM-8 AV AD8647ARMZ-R2 4 C to +25 C -Lead MSOP RM- AW AD8647ARMZ-REEL 4 C to +25 C -Lead MSOP RM- AW AD8648ARZ 4 C to +25 C 4-Lead SOIC_N R-4 AD8648ARZ-REEL 4 C to +25 C 4-Lead SOIC_N R-4 AD8648ARZ-REEL7 4 C to +25 C 4-Lead SOIC_N R-4 AD8648ARUZ 4 C to +25 C 4-Lead TSSOP RU-4 AD8648ARUZ-REEL 4 C to +25 C 4-Lead TSSOP RU-4 Z = RoHS Compliant Part. Rev. B Page 8 of 2

19 AD8646/AD8647/AD8648 NOTES Rev. B Page 9 of 2

20 AD8646/AD8647/AD8648 NOTES Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D6527--/7(B) Rev. B Page 2 of 2

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