Low Power, Low Noise Voltage References with Sink/Source Capability
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1 Low Power, Low Noise Voltage References with Sink/Source Capability ADR36/ADR36/ADR363/ADR364/ADR365/ADR366 FEATURES Compact TSOT packages Low temperature coefficient B grade: 9 ppm/ C A grade: 25 ppm/ C Initial accuracy B grade: ±3 mv maximum A grade: ±6 mv maximum Ultralow output noise: 6.8 μv p-p (. Hz to Hz) Low dropout: 3 mv Low supply current: 9 μa maximum No external capacitor required Output current: +5 ma/ ma Wide temperature range: 4 C to +25 C Qualified for automotive applications APPLICATIONS Battery-powered instruments Portable medical instruments Data acquisition systems Industrial process controls Automotive GENERAL DESCRIPTION The ADR36/ADR36/ADR363/ADR364/ADR365/ADR366 are precision 2.48 V, 2.5 V, 3. V, 4.96 V, 5. V, and 3.3 V band gap voltage references that offer low power and high precision in tiny footprints. Using patented temperature drift curvature correction techniques from Analog Devices, Inc., the ADR36x references achieve a low temperature drift of 9 ppm/ C in a TSOT package. The ADR36x family of micropower, low dropout voltage references provides a stable output voltage from a minimum PIN CONFIGURATION NC GND 2 3 ADR36x TOP VIEW (Not to Scale) NC = NO CONNECT Figure. 5-Lead TSOT (UJ) 5 4 TRIM Table. ADR36x Family of Devices Temperature Model VOUT (V) Coefficient (ppm/ C) Accuracy (mv) ADR36B ±3 ADR36A ±6 ADR36B ±3 ADR36A ±6 ADR363B 3. 9 ±3 ADR363A ±6 ADR364B ±4 ADR364A ±8 ADR365B 5. 9 ±4 ADR365A ±8 ADR366B ±4 ADR366A ±8 Contact Analog Devices for other voltage options. supply of 3 mv above the output. Their advanced design eliminates the need for external capacitors, which further reduces board space and system cost. The combination of low power operation, small size, and ease of use makes the ADR36x precision voltage references ideally suited for battery-operated applications. See the Ordering Guide for automotive grades Rev. D 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 Configuration... General Description... Revision History... 2 Specifications... 3 ADR36 Electrical Characteristics... 3 ADR36 Electrical Characteristics... 4 ADR363 Electrical Characteristics... 5 ADR364 Electrical Characteristics... 6 ADR365 Electrical Characteristics... 7 ADR366 Electrical Characteristics... 8 Absolute Maximum Ratings... 9 Thermal Resistance...9 ESD Caution...9 Typical Performance Characteristics... Terminology... 5 Theory of Operation... 6 Device Power Dissipation Considerations... 6 Input Capacitor... 6 Output Capacitor... 6 Applications Information... 7 Basic Voltage Reference Connection... 7 Outline Dimensions... 9 Ordering Guide... 2 Automotive Products... 2 REVISION HISTORY / Rev. C to Rev. D Changes to Features Section and General Description Section. Changed Supply Voltage Headroom to Dropout Voltage Throughout... 3 Changed. Hz to Hz to f =. Hz to Hz Throughout... 3 Change to Table Changes to Figure 3... Changes to Figure Changes to Ordering Guide... 2 Added Automotive Products Section /7 Rev. B to Rev. C Changes to Ripple Rejection Ratio in Table Changes to Ripple Rejection Ratio in Table Changes to Ripple Rejection Ratio in Table Changes to Ripple Rejection Ratio in Table Changes to Ripple Rejection Ratio in Table Changes to Ripple Rejection Ratio in Table /7 Rev. A to Rev. B Changes to Table Changes to Figure 6... Changes to Figure 3, Figure 4, Figure 7, and Figure 27 Captions... 2 Changes to Ordering Guide /6 Rev. to Rev. A Changes to Figure 5 Caption... 3 Changes to Figure 2 Caption... 4 Changes to Theory of Operation Section... 6 Changes to Figure /5 Revision : Initial Version Rev. D Page 2 of 2
3 SPECIFICATIONS ADR36 ELECTRICAL CHARACTERISTICS VIN = 2.35 V to 5 V, TA = 25 C, unless otherwise noted. Table 2. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A grade V B grade V INITIAL ACCURACY VOUTERR A grade ±6 mv A grade ±.29 % B grade ±3 mv B grade ±.5 % TEMPERATURE COEFFICIENT TCVOUT A grade, 4 C < TA < +25 C 25 ppm/ C B grade, 4 C < TA < +25 C 9 ppm/ C DROPOUT VOLTAGE VIN VOUT 3 mv LINE REGULATION VOUT/ VIN VIN = 2.45 V to 5 V, 4 C < TA < +25 C.5 mv/v LOAD REGULATION VOUT/ ILOAD ILOAD = ma to 5 ma, 4 C < TA < +25 C, VIN = 3 V.37 mv/ma ILOAD = ma to ma, 4 C < TA < +25 C, VIN = 3 V.82 mv/ma QUIESCENT CURRENT IIN 4 C < TA < +25 C 5 9 μa VOLTAGE NOISE en p-p f =. Hz to Hz 6.8 μv p-p TURN-ON SETTLING TIME tr 25 μs LONG-TERM STABILITY VOUT hours 5 ppm OUTPUT VOLTAGE HYSTERESIS VOUT_HYS ppm RIPPLE REJECTION RATIO RRR fin = 6 Hz 7 db SHORT CIRCUIT TO GND ISC VIN = 5 V 25 ma VIN = 5 V 3 ma The long-term stability specification is noncumulative. The drift after the first hours is significantly lower than it is in the first hours. Rev. D Page 3 of 2
4 ADR36 ELECTRICAL CHARACTERISTICS VIN = 2.8 V to 5 V, TA = 25 C, unless otherwise noted. Table 3. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A grade V B grade V INITIAL ACCURACY VOUTERR A grade ±6 mv A grade ±.24 % B grade ±3 mv B grade ±.2 % TEMPERATURE COEFFICIENT TCVOUT A grade, 4 C < TA < +25 C 25 ppm/ C B grade, 4 C < TA < +25 C 9 ppm/ C DROPOUT VOLTAGE VIN VOUT 3 mv LINE REGULATION VOUT/ VIN VIN = 2.8 V to 5 V, 4 C < TA < +25 C.25 mv/v LOAD REGULATION VOUT/ ILOAD ILOAD = ma to 5 ma, 4 C < TA < +25 C, VIN = 3.5 V.45 mv/ma ILOAD = ma to ma, 4 C < TA < +25 C, VIN = 3.5 V mv/ma QUIESCENT CURRENT IIN 4 C < TA < +25 C 5 9 μa VOLTAGE NOISE en p-p f =. Hz to Hz 8.25 μv p-p TURN-ON SETTLING TIME tr 25 μs LONG-TERM STABILITY VOUT hours 5 ppm OUTPUT VOLTAGE HYSTERESIS VOUT_HYS ppm RIPPLE REJECTION RATIO RRR fin = 6 Hz 7 db SHORT CIRCUIT TO GND ISC VIN = 5 V 25 ma VIN = 5 V 3 ma The long-term stability specification is noncumulative. The drift after the first hours is significantly lower than it is in the first hours. Rev. D Page 4 of 2
5 ADR363 ELECTRICAL CHARACTERISTICS VIN = 3.3 V to 5 V, TA = 25 C, unless otherwise noted. Table 4. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A grade V B grade V INITIAL ACCURACY VOUTERR A grade ±6 mv A grade ±.2 % B grade ±3 mv B grade ±. % TEMPERATURE COEFFICIENT TCVOUT A grade, 4 C < TA < +25 C 25 ppm/ C B grade, 4 C < TA < +25 C 9 ppm/ C DROPOUT VOLTAGE VIN VOUT 3 mv LINE REGULATION VOUT/ VIN VIN = 3.3 V to 5 V, 4 C < TA < +25 C.5 mv/v LOAD REGULATION VOUT/ ILOAD ILOAD = ma to 5 ma, 4 C < TA < +25 C, VIN = 4 V.54 mv/ma ILOAD = ma to ma, 4 C < TA < +25 C, VIN = 4 V.2 mv/ma QUIESCENT CURRENT IIN 4 C < TA < +25 C 5 9 μa VOLTAGE NOISE en p-p f =. Hz to Hz 8.7 μv p-p TURN-ON SETTLING TIME tr 25 μs LONG-TERM STABILITY VOUT hours 5 ppm OUTPUT VOLTAGE HYSTERESIS VOUT_HYS ppm RIPPLE REJECTION RATIO RRR fin = 6 Hz 7 db SHORT CIRCUIT TO GND ISC VIN = 5 V 25 ma VIN = 5 V 3 ma The long-term stability specification is noncumulative. The drift after the first hours is significantly lower than it is in the first hours. Rev. D Page 5 of 2
6 ADR364 ELECTRICAL CHARACTERISTICS VIN = 4.4 V to 5 V, TA = 25 C, unless otherwise noted. Table 5. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A grade V B grade V INITIAL ACCURACY VOUTERR A grade ±8 mv A grade ±.2 % B grade ±4 mv B grade ±. % TEMPERATURE COEFFICIENT TCVOUT A grade, 4 C < TA < +25 C 25 ppm/ C B grade, 4 C < TA < +25 C 9 ppm/ C DROPOUT VOLTAGE VIN VOUT 3 mv LINE REGULATION VOUT/ VIN VIN = 4.4 V to 5 V, 4 C < TA < +25 C.25 mv/v LOAD REGULATION VOUT/ ILOAD ILOAD = ma to 5 ma, 4 C < TA < +25 C, VIN = 5 V.735 mv/ma ILOAD = ma to ma, 4 C < TA < +25 C, VIN = 5 V.75 mv/ma QUIESCENT CURRENT IIN 4 C < TA < +25 C 5 9 μa VOLTAGE NOISE en p-p f =. Hz to Hz μv p-p TURN-ON SETTLING TIME tr 25 μs LONG-TERM STABILITY VOUT hours 5 ppm OUTPUT VOLTAGE HYSTERESIS VOUT_HYS ppm RIPPLE REJECTION RATIO RRR fin = 6 Hz 7 db SHORT CIRCUIT TO GND ISC VIN = 5 V 25 ma VIN = 5 V 3 ma The long-term stability specification is noncumulative. The drift after the first hours is significantly lower than it is in the first hours. Rev. D Page 6 of 2
7 ADR365 ELECTRICAL CHARACTERISTICS VIN = 5.3 V to 5 V, TA = 25 C, unless otherwise noted. Table 6. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A grade V B grade V INITIAL ACCURACY VOUTERR A grade ±8 mv A grade ±.6 % B grade ±4 mv B grade ±.8 % TEMPERATURE COEFFICIENT TCVOUT A grade, 4 C < TA < +25 C 25 ppm/ C B grade, 4 C < TA < +25 C 9 ppm/ C DROPOUT VOLTAGE VIN VOUT 3 mv LINE REGULATION VOUT/ VIN VIN = 5.3 V to 5 V, 4 C < TA < +25 C.25 mv/v LOAD REGULATION VOUT/ ILOAD ILOAD = ma to 5 ma, 4 C < TA < +25 C, VIN = 6V.9 mv/ma ILOAD = ma to ma, 4 C < TA < +25 C, VIN = 6 V 2 mv/ma QUIESCENT CURRENT IIN 4 C < TA < +25 C 5 9 μa VOLTAGE NOISE en p-p f =. Hz to Hz 2.8 μv p-p TURN-ON SETTLING TIME tr 2 μs LONG-TERM STABILITY VOUT hours 5 ppm OUTPUT VOLTAGE HYSTERESIS VOUT_HYS ppm RIPPLE REJECTION RATIO RRR fin = 6 Hz 7 db SHORT CIRCUIT TO GND ISC VIN = 5 V 25 ma VIN = 5 V 3 ma The long-term stability specification is noncumulative. The drift after the first hours is significantly lower than it is in the first hours. Rev. D Page 7 of 2
8 ADR366 ELECTRICAL CHARACTERISTICS VIN = 3.6 V to 5 V, TA = 25 C, unless otherwise noted. Table 7. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A grade V B grade V INITIAL ACCURACY VOUTERR A grade ±8 mv A grade ±.25 % B grade ±4 mv B grade ±.25 % TEMPERATURE COEFFICIENT TCVOUT A grade, 4 C < TA < +25 C 25 ppm/ C B grade, 4 C < TA < +25 C 9 ppm/ C DROPOUT VOLTAGE VIN VOUT 3 mv LINE REGULATION VOUT/ VIN VIN = 3.6 V to 5 V, 4 C < TA < +25 C.65 mv/v LOAD REGULATION VOUT/ ILOAD ILOAD = ma to 5 ma, 4 C < TA < +25 C, VIN = 4.2 V.6 mv/ma ILOAD = ma to 8 ma, 4 C < TA < +25 C, VIN 4.75 V.6 mv/ma ILOAD = ma to ma, 4 C < TA < +25 C, VIN = 4.2 V.35 mv/ma QUIESCENT CURRENT IIN 4 C < TA < +25 C 5 9 μa VOLTAGE NOISE en p-p f =. Hz to Hz 9.3 μv p-p TURN-ON SETTLING TIME tr 25 μs LONG-TERM STABILITY VOUT hours 5 ppm OUTPUT VOLTAGE HYSTERESIS VOUT_HYS ppm RIPPLE REJECTION RATIO RRR fin = 6 Hz 7 db SHORT CIRCUIT TO GND ISC VIN = 5 V 25 ma VIN = 5 V 3 ma The long-term stability specification is noncumulative. The drift after the first hours is significantly lower than it is in the first hours. Rev. D Page 8 of 2
9 ABSOLUTE MAXIMUM RATINGS TA = 25 C, unless otherwise noted. Table 8. Parameter Rating Supply Voltage 8 V Output Short-Circuit Duration to GND VIN < 5 V Indefinite VIN > 5 V sec Storage Temperature Range 65 C to +25 C Operating Temperature Range 4 C to +25 C Junction Temperature Range 65 C to +5 C Lead Temperature (Soldering, 6 sec) 3 C THERMAL RESISTANCE θja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 9. Thermal Resistance Package Type θja θjc Unit 5-Lead TSOT (UJ) C/W ESD CAUTION 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. Rev. D Page 9 of 2
10 TYPICAL PERFORMANCE CHARACTERISTICS (V) 2.48 (V) TEMPERATURE ( C) Figure 2. ADR36 Output Voltage vs. Temperature TEMPERATURE ( C) Figure 5. ADR365 Output Voltage vs. Temperature C (V) I DD (ma) C 4 C TEMPERATURE ( C) Figure 3. ADR36 Output Voltage vs. Temperature (V) Figure 6. ADR36 Supply Current vs. Input Voltage C (V) I DD (ma) C 4 C TEMPERATURE ( C) Figure 4. ADR363 Output Voltage vs. Temperature (V) Figure 7. ADR365 Supply Current vs. Input Voltage Rev. D Page of 2
11 LOAD REGULATION (mv/ma) = 9V = 3.5V LINE REGULATION (ppm/v) TEMPERATURE ( C) Figure 8. ADR36 Load Regulation vs. Temperature TEMPERATURE ( C) Figure. ADR36 Line Regulation vs. Temperature, VIN = 2.8 V to 5 V LOAD REGULATION (mv/ma).2. = 9V.8.6 = 6V TEMPERATURE ( C) Figure 9. ADR365 Load Regulation vs. Temperature LINE REGULATION (ppm/v) TEMPERATURE ( C) Figure 2. ADR365 Line Regulation vs. Temperature, VIN = 5.3 V to 5 V LINE REGULATION (ppm/v) DROPOUT VOLTAGE (V) C +25 C +25 C TEMPERATURE ( C) Figure. ADR36 Line Regulation vs. Temperature, VIN = 2.45 V to 5 V LOAD CURRENT (ma) Figure 3. ADR36 Dropout Voltage vs. Load Current Rev. D Page of 2
12 C DROPOUT VOLTAGE (V) C C µV/DIV TIME = s/div LOAD CURRENT (ma) Figure 4. ADR365 Dropout Voltage vs. Load Current Figure 7. ADR363. Hz to Hz Noise 2µV/DIV TIME = s/div µV/DIV TIME = s/div Figure 5. ADR36. Hz to Hz Noise Figure 8. ADR363 Hz to khz Noise 5µV/DIV TIME = s/div µV/DIV TIME = s/div Figure 6. ADR36 Hz to khz Noise Figure 9. ADR365. Hz to Hz Noise Rev. D Page 2 of 2
13 5mV/DIV 5mV/DIV µv/div TIME = s/div Figure 2. ADR365 Hz to khz Noise µs/DIV Figure 23. ADR36 Line Transient Response (Increasing), No Capacitors OUTPUT IMPEDANCE (Ω) k k k FREQUENCY (Hz) Figure 2. Output Impedance vs. Frequency mV/DIV 5mV/DIV µs/div Figure 24. ADR36 Line Transient Response (Decreasing), No Capacitors RIPPLE REJECTION RATIO (db) k k k FREQUENCY (Hz) Figure 22. Ripple Rejection Ratio vs. Frequency M mV/DIV 2mV/DIV µs/div Figure 25. ADR36 Line Transient Response,. μf Input Capacitor Rev. D Page 3 of 2
14 LOAD OFF LOAD ON 5V/DIV INPUT mv/div 2.5V/DIV OUTPUT 2ms/DIV Figure 26. ADR36 Load Transient Response ns/DIV Figure 29. ADR36 Turn-Off Response Time at 5 V LOAD ON 5V/DIV mv/div 2V/DIV µs/div Figure 27. ADR36 Load Transient Response with. μf Output Capacitor µs/div Figure 3. ADR36 Turn-On Response Time,. μf Output Capacitor V/DIV INPUT 5V/DIV 2.5V/DIV OUTPUT 2V/DIV µs/div Figure 28. ADR36 Turn-On Response Time at 5 V ms/DIV Figure 3. ADR36 Turn-Off Response Time,. μf Output Capacitor Rev. D Page 4 of 2
15 TERMINOLOGY Temperature Coefficient The change of output voltage with respect to operating temperature changes normalized by the output voltage at 25 C. This parameter is expressed in ppm/ C and can be determined by VOUT ( T2 ) VOUT ( T ) 6 TCV OUT[ ppm/ C] = V 25 C T T OUT where: VOUT (25 C) = VOUT at 25 C. VOUT (T) = VOUT at Temperature. VOUT (T2) = VOUT at Temperature 2. ( ) ( ) Line Regulation The change in output voltage due to a specified change in input voltage. This parameter accounts for the effects of self-heating. Line regulation is expressed in either percent per volt, parts per million per volt, or microvolts per volt change in input voltage. Load Regulation The change in output voltage due to a specified change in load current. This parameter accounts for the effects of self-heating. Load regulation is expressed in either microvolts per milliampere, parts per million per milliampere, or ohms of dc output resistance. 2 Long-Term Stability The typical shift of output voltage at 25 C on a sample of parts subjected to a test of hours at 25 C. where: Δ V ΔV OUT OUT = VOUT ( t ) VOUT ( t ) VOUT ( t ) VOUT ( t ) [ ] ( ) 6 ppm = VOUT t VOUT (t) = VOUT at 25 C at Time. VOUT (t) = VOUT at 25 C after hours operation at 25 C. Thermal Hysteresis The change of output voltage after the device is cycled from +25 C to 4 C to +25 C and back to +25 C. This is a typical value from a sample of parts put through such a cycle. V OUT _ HYS = VOUT ( 25 C) VOUT _ TC VOUT ( 25 C) VOUT _ TC 6 V OUT _ HYS [ ppm ] = V ( 25 C) OUT where: VOUT (25 C) = VOUT at 25 C. VOUT_TC = VOUT at 25 C after temperature cycle at +25 C to 4 C to +25 C and back to +25 C. Rev. D Page 5 of 2
16 THEORY OF OPERATION Band gap references are the high performance solution for low supply voltage and low power voltage reference applications, and the ADR36x family is no exception. The uniqueness of these products lies in their architecture. The ideal zero TC band gap voltage is referenced to the output, not to ground (see Figure 32). Therefore, if noise exists on the ground line, it is greatly attenuated on VOUT. The band gap cell consists of the PNP pair Q53 and Q52 running at unequal current densities. The difference in VBE results in a voltage with a positive TC, which is amplified by a ratio of R59 2 R54 This PTAT voltage, combined with the VBE of Q53 and Q52, produces the stable band gap voltage. Reduction in the band gap curvature is performed by the ratio of Resistor R44 and Resistor R59, one of which is linearly temperature dependent. Precision laser trimming and other patented circuit techniques are used to further enhance the drift performance. Q53 R59 R54 R6 R53 R58 Q2 R44 Q52 R6 Q6 R R Q Q6 Figure 32. Simplified Schematic R49 62kΩ R5 3kΩ R48 (FORCE) (SENSE) TRIM DEVICE POWER DISSIPATION CONSIDERATIONS The ADR36x family is capable of delivering load currents to 5 ma with an input voltage ranging from V (ADR36 only) to 8 V. When this device is used in applications with large input voltages, care should be taken to avoid exceeding the specified maximum power dissipation or junction temperature because it may result in premature device failure. Use the following formula to calculate a device s maximum junction temperature or dissipation: P where: D TJ T = θ JA A TJ and TA are the junction and ambient temperatures, respectively. PD is the device power dissipation. θja is the device package thermal resistance. INPUT CAPACITOR Input capacitors are not required on the ADR36x. There is no limit for the value of the capacitor used on the input, but a μf to μf capacitor on the input improves transient response in applications where the supply suddenly changes. An additional. μf capacitor in parallel also helps reduce noise from the supply. OUTPUT CAPACITOR The ADR36x does not require output capacitors for stability under any load condition. An output capacitor, typically. μf, filters out low level noise voltage and does not affect the operation of the part. On the other hand, the load transient response can improve with an additional μf to μf output capacitor placed in parallel with the. μf capacitor. The additional capacitor acts as a source of stored energy for a sudden increase in load current, and the only parameter that degrades is the turn-on time. The amount of degradation depends on the size of the capacitor chosen. Rev. D Page 6 of 2
17 APPLICATIONS INFORMATION BASIC VOLTAGE REFERENCE CONNECTION The circuit in Figure 33 illustrates the basic configuration for the ADR36x family. Decoupling capacitors are not required for circuit stability. The ADR36x family is capable of driving capacitive loads from μf to μf. However, a. μf ceramic output capacitor is recommended to absorb and deliver the charge, as is required by a dynamic load. Two reference ICs are used and fed from an unregulated input, VIN. The outputs of the individual ICs are connected in series, which provides two output voltages, VOUT and VOUT2. VOUT is the terminal voltage of U, and VOUT2 is the sum of this voltage and the terminal voltage of U2. U and U2 are chosen for the two voltages that supply the required outputs (see Table ). For example, if both U and U2 are ADR36s, VOUT is 2.5 V and VOUT2 is 5. V. INPUT.µF 2 3 NC GND ADR36x TRIM Figure 33. Basic Configuration for the ADR36x Family Stacking Reference ICs for Arbitrary Outputs 5 4 OUTPUT.µF Some applications require two reference voltage sources, which are a combined sum of standard outputs. Figure 34 shows how this stacked output reference can be implemented Table. Output U/U2 VOUT (V) VOUT2 (V) ADR36/ADR ADR36/ADR ADR365/ADR Negative Precision Reference Without Precision Resistors A negative reference is easily generated by adding an op amp, A (see Figure 35). VOUTF and VOUTS are at virtual ground and therefore the negative reference can be taken directly from the output of the op amp. The op amp must be dual-supply, low offset, and rail-to-rail if the negative supply voltage is close to the reference output. NC TRIM 5 C2.µF 2 3 GND ADR36x 4 2 +V DD 2 3 NC GND ADR36x TRIM 5 4 C.µF 2 NC GND TRIM ADR36x 5 V REF A 3 Figure 34. Stacking Voltage References with the ADR36x V DD Figure 35. Negative Reference Rev. D Page 7 of 2
18 General-Purpose Current Source Often in low power applications, the need arises for a precision current source that can operate on low supply voltages. The ADR36x can be configured as a precision current source (see Figure 36). The circuit configuration illustrated is a floating current source with a grounded load. The output voltage of the reference is bootstrapped across RSET, which sets the output current of the load. With this configuration, circuit precision is maintained for load currents ranging from the reference s supply current, typically 5 μa, up to approximately 5 ma. Trim Terminal The ADR36x trim terminal can be used to adjust the output voltage over a nominal voltage. This feature allows a system designer to trim system errors by setting the reference to a voltage other than the standard voltage option. Resistor R is used for fine adjustments and can be omitted if desired. The resistor values should be carefully chosen to ensure that the maximum current drive of the part is not exceeded. R2 kω +V DD 2 3 NC GND TRIM ADR36x 5 4 R SET R I SET +V DD 2 3 NC GND ADR36x TRIM 5 4 R kω POT kω I SY P Figure 37. ADR36x Trim Configuration R L Figure 36. Precision Current Source I SET + I SY Rev. D Page 8 of 2
19 OUTLINE DIMENSIONS 2.9 BSC BSC 2.8 BSC 2 3 * PIN.9 BSC.95 BSC *. MAX. MAX.5 SEATING.3 PLANE *COMPLIANT TO JEDEC STANDARDS MO-93-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS. Figure Lead Thin Small Outline Transistor Package [TSOT] (UJ-5) Dimensions shown in millimeters Rev. D Page 9 of 2
20 ORDERING GUIDE Model, 2 Output Voltage Initial Accuracy, ± (VOUT) (mv) (%) Temperature Coefficient (ppm/ C) Package Description Package Option Temperature Range Ordering Quantity ADR36AUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RC ADR36AUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RC ADR36BUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RD ADR36BUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RD ADR36AUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RE ADR36AUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RE ADR36BUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RF ADR36BUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RF ADR363AUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RG ADR363AUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RG ADR363BUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RH ADR363BUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RH ADR364AUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RJ ADR364AUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RJ ADR364BUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RK ADR364BUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RK ADR365AUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RL ADR365AUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RL ADR365BUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, RM ADR365BUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 RM ADR365WAUJZ-R Lead TSOT UJ-5 4 C to +25 C 3, RL ADR365WAUJZ-RL Lead TSOT UJ-5 4 C to +25 C, RL ADR366AUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, R8 ADR366AUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 R8 ADR366BUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, R9 ADR366BUJZ-R Lead TSOT UJ-5 4 C to +25 C 25 R9 ADR366WAUJZ-REEL Lead TSOT UJ-5 4 C to +25 C 3, R8 Z = RoHS Compliant Part. 2 W = Qualified for Automotive Applications. Branding AUTOMOTIVE PRODUCTS The ADR365W and ADR366W models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. Note that these automotive models may have specifications that differ from the commercial models; therefore, designers should review the Specifications section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D5467--/(D) Rev. D Page 2 of 2
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