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| Low Power, Precision Reference and Op Amp ADR821/ADR827 FEATURES 10-lead MSOP 400 A supply current -40C to +125C temperature range On-board precision resistors Reference ADR821: 2.8 V to 15 V operation ADR827: 2.7 V to 15 V operation 0.2% initial accuracy 15 ppm/C temperature drift maximum +5 mA/-3 mA output drive Amplifier ADR821 2.8 V to 15 V operation 2.8 V to 15 V single-supply operation ADR827 2.7 V to 15 V operation 2.7 V to 15 V single-supply operation Rail-to-rail input and output 500 V offset voltage maximum 50 nA bias current maximum Unity gain stable No phase reversal FUNCTIONAL BLOCK DIAGRAM V+ 1 R1 2 GND 3 NC 4 V- 5 NC = NO CONNECT REF ADR821/ADR827 R1 R2 10 AMP_OUT 9 8 7 6 R2 -IN +IN REF_OUT Figure 1. Table 1. Selection Table Reference VOUT 1.25 V 1.25 V 2.50 V 2.50 V Reference Accuracy 0.4% 0.2% 0.4% 0.2% Reference Temperature Coefficient 30 ppm/C 15 ppm/C 30 ppm/C 15 ppm/C Part No. ADR827ARMZ ADR827BRMZ ADR821ARMZ ADR821BRMZ APPLICATIONS Battery-powered instrumentation Portable medical instrumentation Data acquisition systems Industrial process controls Automotive applications GENERAL DESCRIPTION The ADR821/ADR827 combines a precision voltage reference and an op amp in a 10-lead mini small outline package (MSOP). The reference and the op amp can be operated independently, offering the user a range of flexibility when arranging the combination. Featuring a combined operating current of less than 400 A and 15 ppm/C temperature drift on the reference, the ADR821/ADR827 are ideally suited for applications requiring precision and low power. Available with the reference at 1.25 V and at 2.5 V, the ADR821/ADR827 also come in two grades. The reference on the A grade offers 30 ppm/C temperature drift performance and 0.4% initial accuracy. The B grade provides a tighter temperature drift performance of 15 ppm/C and only 0.2% initial accuracy. All versions operate from -40C to +125C. Rev. 0 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 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2007 Analog Devices, Inc. All rights reserved. 06665-001 ADR821/ADR827 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 ADR821 Electrical Characteristics--Reference ....................... 3 ADR821 Electrical Characteristics--Amplifier (VS = 2.8 V)................................................................................. 4 ADR821 Electrical Characteristics--Amplifier (VS = 15 V).................................................................................. 5 ADR827 Electrical Characteristics--Reference ....................... 6 ADR827 Electrical Characteristics--Amplifier (VS = 2.7 V)................................................................................. 7 ADR827 Electrical Characteristics--Amplifier (VS = 15 V).................................................................................. 8 Absolute Maximum Ratings ............................................................9 Thermal Resistance .......................................................................9 ESD Caution...................................................................................9 Pin Configuration and Function Descriptions........................... 10 Typical Performance Characteristics ........................................... 11 Reference ..................................................................................... 11 Amplifier (AD821/AD827)....................................................... 15 Applications Information .............................................................. 18 +2.5 V and -2.5 V Outputs (ADR821) ................................... 18 2.5 V and 5.0 V Outputs (ADR821)......................................... 18 Multiple 2.5 V Outputs (ADR821)........................................... 18 Outline Dimensions ....................................................................... 19 Ordering Guide .......................................................................... 19 REVISION HISTORY 10/07--Revision 0: Initial Version Rev. 0 | Page 2 of 20 ADR821/ADR827 SPECIFICATIONS ADR821 ELECTRICAL CHARACTERISTICS--REFERENCE VIN = 2.8 V to 15 V, TA = 25C, CIN = COUT = 0.1 F, unless otherwise noted. Table 2. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade B Grade TEMPERATURE COEFFICIENT A Grade B Grade DROPOUT (VOUT - VIN) LINE REGULATION LOAD REGULATION TCVOUT -40C < TA < +125C 30 15 0.3 50 400 200 600 300 ppm/C ppm/C V ppm/V ppm/mA ppm/mA ppm/mA ppm/mA V p-p V p-p s A A k % ppm/C Symbol VOUT Conditions Min 2.490 2.495 VOERR 10 0.40 5.00 0.20 mV % mV % Typ 2.500 2.500 Max 2.510 2.505 Unit V V VDO VOUT/VIN VOUT/ILOAD VOLTAGE NOISE BROADBAND NOISE TURN-ON SETTLING TIME POWER SUPPLY Positive Supply Current Negative Supply Current ON-BOARD RESISTORS Resistor Tolerance Resistor Matching Resistor Temperature Coefficient eN p-p tR ISY+ ISY- R1, R2 IOUT = 0 mA VIN = 2.8 V to 15 V, -40C < TA < +125C ILOAD = 0 mA to 5 mA, -40C < TA < +125C, VIN = 5 V ILOAD = 0 mA to 5 mA, VIN = 5 V ILOAD = -3 mA to 0 mA, -40C < TA < +125C, VIN = 5 V ILOAD = -3 mA to +5 mA, VIN = 5 V 0.1 Hz to 10 Hz 10 Hz to 10 kHz CIN = 0 F No load, -40C < TA < +125C No load, -40C < TA < +125C 8 20 80 80 16 430 80 400 300 10 0.5 100 12 TC Rev. 0 | Page 3 of 20 ADR821/ADR827 ADR821 ELECTRICAL CHARACTERISTICS--AMPLIFIER (VS = 2.8 V) VCM = 0 V, TA = 25C, unless otherwise noted. Table 3. Parameter INPUT CHARACTERISTICS Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Bias Current Large Signal Voltage Gain Symbol VOS TCVOS IB IOS AVO Conditions -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C VOUT = -1.5 V to +1.5 V RLOAD = 10 k, -40C < TA < +125C RLOAD = 2 k, -40C < TA < +125C VCM = -1.5 V to +1.5 V, -40C < TA < +125C Min Typ 100 2 15 5 99 94 75 85 2.6 2.55 108 100 100 Max 500 5 50 25 Unit V V/C nA nA dB dB dB dB V V V V A A dB V/s MHz Degrees V p-p nV/Hz Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low POWER SUPPLY Positive Supply Current Negative Supply Current Power Supply Rejection Ratio DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density CMRR VOH VOL ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C No load, -40C < TA < +125C No load, -40C < TA < +125C VS = 2.8 V to 15 V RLOAD = 10 k, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF f = 0.1 Hz to 10 Hz f = 1 kHz 2.7 -2.7 -2.6 -2.55 400 300 ISY+ ISY- PSRR SR GBP M eN p-p eN 75 100 0.5 1.0 72.5 0.2 16 Rev. 0 | Page 4 of 20 ADR821/ADR827 ADR821 ELECTRICAL CHARACTERISTICS--AMPLIFIER (VS = 15 V) VCM= 0 V, TA = 25C, unless otherwise noted. Table 4.A Parameter INPUT CHARACTERISTICS Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Bias Current Large Signal Voltage Gain Symbol VOS TCVOS IB IOS AVO Conditions -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C VOUT = -14 V to +14 V RLOAD = 10 k, -40C < TA < +125C RLOAD = 2 k, -40C < TA < +125C VCM = -14 V to +14 V, -40C < TA < +125C Min Typ 100 2 10 5 109.5 100 75 85 14.8 14.75 118 111 100 Max 500 5 50 25 Unit V V/oC nA nA dB dB dB dB V V V V mA A A dB V/s MHz Degrees V p-p nV/Hz Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output Voltage high Output Voltage Low Output Current POWER SUPPLY Positive Supply Current Negative Supply Current Power Supply Rejection Ratio DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density CMRR VOH VOL ISC ISY+ ISY- PSRR SR GBP M eN p-p eN ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C Short-circuit current No load, -40C < TA < +125C No load, -40C < TA < +125C VS = 2.8 V to 15 V RLOAD = 10 k, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF f = 0.1 Hz to 10 Hz f = 1 kHz 14.9 -14.9 20 400 300 -14.8 -14.75 75 100 0.5 1.0 75.4 0.2 16 Rev. 0 | Page 5 of 20 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS--REFERENCE VIN = 2.7 V to 15 V, TA = 25C, CIN = COUT = 0.1 F, unless otherwise noted. Table 5. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade B Grade TEMPERATURE COEFFICIENT A Grade B Grade DROPOUT (VOUT - VIN) LINE REGULATION LOAD REGULATION TCVOUT -40C < TA < +125C 30 15 1.45 50 400 200 600 300 ppm/C ppm/C V ppm/V ppm/mA ppm/mA ppm/mA ppm/mA V p-p V p-p s A A k % ppm/C Symbol VOUT Conditions Min 1.245 1.2475 VOERR 5 0.40 2.50 0.20 mV % mV % Typ 1.250 1.250 Max 1.255 1.2525 Unit V V VDO VOUT/VIN VOUT/ILOAD VOLTAGE NOISE BROADBAND NOISE TURN-ON SETTLING TIME POWER SUPPLY Positive Supply Current Negative Supply Current ON-BOARD RESISTORS Resistor Tolerance Resistor Matching Resistor Temperature Coefficient eN p-p tR ISY+ ISY- R1, R2 IOUT = 0 mA VIN = 2.7 V to 15 V, -40C < TA < +125C ILOAD = 0 mA to 5 mA, -40C < TA < +125C, VIN = 3 V ILOAD = 0 mA to 5 mA, VIN = 3 V ILOAD = -3 mA to 0 mA, -40C < TA < +125C, VIN = 3 V ILOAD = -3 mA to +5 mA, VIN = 3 V 0.1 Hz to 10 Hz 10 Hz to 10 kHz CIN = 0 F, COUT = 0.1 F No load, -40C < TA < +125C No load, -40C < TA < +125C 8 20 80 80 8 260 80 400 300 10 0.5 100 12 TC Rev. 0 | Page 6 of 20 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS--AMPLIFIER (VS = 2.7 V) VCM = 0 V, TA = 25C, unless otherwise noted. Table 6. Parameter INPUT CHARACTERISTICS Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Bias Current Large Signal Voltage Gain Symbol VOS TCVOS IB IOS AVO Conditions -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C VOUT = -1.5 V to +1.5 V RLOAD = 10 k, -40C < TA < +125C RLOAD = 2 k, -40C < TA < +125C VCM = -1.5 V to +1.5 V, -40C < TA < +125C Min Typ 100 2 15 5 99 94 75 85 2.5 2.45 108 100 100 Max 500 5 50 25 Unit V V/C nA nA dB dB dB dB V V V V A A dB V/s MHz Degrees V p-p nV/Hz Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low POWER SUPPLY Positive Supply Current Negative Supply Current Power Supply Rejection Ratio DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density CMRR VOH VOL ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C No load, -40C < TA < +125C No load, -40C < TA < +125C VS = 2.7 V to 15 V RLOAD = 10 k, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF f = 0.1 Hz to 10 Hz f = 1 kHz 2.6 -2.6 -2.5 -2.45 400 300 ISY+ ISY- PSRR SR GBP M eN p-p eN 75 100 0.5 1.0 71.3 0.2 16 Rev. 0 | Page 7 of 20 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS--AMPLIFIER (VS = 15 V) VCM = 0 V, TA = 25C, unless otherwise noted. Table 7. Parameter INPUT CHARACTERISTICS Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Bias Current Large Signal Voltage Gain Symbol VOS TCVOS IB IOS AVO Conditions -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C VOUT = -14 V to +14 V RLOAD = 10 k, -40C < TA < +125C RLOAD = 2 k, -40C < TA < +125C VCM = -14 V to +14 V, -40C < TA < 125C Min Typ 100 2 10 5 109.5 100 75 85 14.8 14.75 118 111 100 Max 500 5 50 25 Unit V V/C nA nA dB dB dB dB V V V V mA A A dB V/s MHz Degrees V p-p nV/Hz Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Output Current POWER SUPPLY Positive Supply Current Negative Supply Current Power Supply Rejection Ratio DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density CMRR VOH VOL ISC ISY+ ISY- PSRR SR GBP M eN p-p eN ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C ILOAD = 1 mA ILOAD = 1 mA, -40C < TA < +125C Short-circuit current No load, -40C < TA < +125C No load, -40C < TA < +125C VS = 2.7 V to 15 V RLOAD = 10 k, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF f = 0.1 Hz to 10 Hz f = 1 kHz 14.9 -14.9 20 400 300 -14.8 -14.75 75 100 0.5 1.0 75.4 0.2 16 Rev. 0 | Page 8 of 20 ADR821/ADR827 ABSOLUTE MAXIMUM RATINGS TA= 25C, unless otherwise noted. Table 8. Parameter Supply Voltage Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) Rating 18 V Indefinite -65C to +125C -40C to +125C -65C to +125C 300C THERMAL RESISTANCE JA is specified for the worst-case conditions, that is, JA is specified for device soldered in circuit board for surface-mount packages. Table 9. Thermal Resistance Package Type 10-Lead MSOP (RM-10) JA 172 JC 50 Unit C/W 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. ESD CAUTION Rev. 0 | Page 9 of 20 ADR821/ADR827 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS V+ 1 R1 2 GND 3 NC 4 V- 5 10 AMP_OUT R2 -IN +IN 06665-002 ADR821/ ADR827 TOP VIEW (Not to Scale) 9 8 7 6 REF_OUT NC = NO CONNECT Figure 2. Pin Configuration Table 10. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 Mnemonic V+ R1 GND NC V- REF_OUT +IN -IN R2 AMP_OUT Description Input Voltage of the Reference/Positive Supply of the Amplifier Resistance Tied to Positive Input of the Amplifier Ground Do Not Connect Any External Components to This Pin Negative Supply of the Amplifier Output Voltage of the Reference Positive Input of the Amplifier Negative Input of the Amplifier Resistance Tied to Positive Input of the Amplifier Output Pin of the Amplifier Rev. 0 | Page 10 of 20 ADR821/ADR827 TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE 2.512 2.508 CIN = 0.1F COUT = 0.1F VIN = 15V 1.260 1.258 1.256 1.254 CIN = 0.1F COUT = 0.1F VIN = 15V 2.504 VOUT (V) VOUT (V) 06665-005 1.252 1.250 1.248 1.246 1.244 1.242 2.500 2.496 2.492 -25 -10 5 20 35 50 65 80 95 110 125 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) TEMPERATURE (C) Figure 3. ADR821 VOUT vs. Temperature Figure 6. ADR827 VOUT vs. Temperature 4 3 CIN = 0.1F COUT = 0.1F VIN = 15V 14 12 CIN = 0.1F COUT = 0.1F VIN = 15V LINE REGULATION (ppm/V) LINE REGULATION (ppm/V) 10 8 6 4 2 0 -40 2 1 0 -1 06665-006 -25 -10 5 20 35 50 65 80 95 110 125 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) TEMPERATURE (C) Figure 4. ADR821 Line Regulation vs. Temperature Figure 7. ADR827 Line Regulation vs. Temperature 0.40 0.35 0.30 CIN = 0.1F COUT = 0.1F 0.40 0.35 0.30 CIN = 0.1F COUT = 0.1F +125C 0.25 +25C -40C +125C +25C -40C ISY+ (mA) ISY+ (mA) 0.25 0.20 0.15 0.10 0.05 2.5 0.20 0.15 0.10 0.05 0 2.5 06665-007 5.0 7.5 10.0 12.5 15.0 5.0 7.5 10.0 12.5 15.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 5. ADR821 Supply Current (+) vs. Supply Voltage Figure 8. ADR827 Supply Current (+) vs. Supply Voltage Rev. 0 | Page 11 of 20 06665-010 06665-009 -2 -40 06665-008 2.488 -40 1.240 -40 ADR821/ADR827 0.25 CIN = 0.1F COUT = 0.1F +125C 0.25 CIN = 0.1F COUT = 0.1F +125C 0.20 0.20 ISY- (mA) ISY- (mA) 0.15 +25C -40C 0.15 +25C -40C 0.10 0.10 0.05 0.05 06665-011 5.0 7.5 10.0 12.5 15.0 5.0 7.5 10.0 12.5 15.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 9. ADR821 Supply Current (-) vs. Supply Voltage 1.2 Figure 12. ADR827 Supply Current (-) vs. Supply Voltage 2.0 CIN = 0.1F COUT = 0.1F CIN = 0.1F 1.8 COUT = 0.1F 1.6 1.4 -40C +25C +125C 1.0 0.8 DROPOUT (V) DROPOUT (V) +125C 1.2 1.0 0.8 0.6 0.4 0.2 0.6 +25C 0.4 -40C 0.2 06665-012 -2 -1 0 1 2 3 4 5 6 7 -2 -1 0 1 2 3 4 5 6 7 LOAD CURRENT (mA) LOAD CURRENT (mA) Figure 10. ADR821 Dropout vs. Load Current 50 45 80 Figure 13. ADR827 Dropout vs. Load Current ISINK = 3mA CIN = COUT = 0.1F ISINK = 3mA CIN = COUT = 0.1F LOAD REGULATION (ppm/mA) 40 VS = 5V 35 30 25 20 15 10 06665-013 LOAD REGULATION (ppm/mA) 70 60 VS = 15V VS = 15V 50 VS = 3V 40 -25 -10 5 20 35 50 65 80 95 110 125 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) TEMPERATURE (C) Figure 11. ADR821 Load Regulation vs. Temperature Figure 14. ADR827 Load Regulation vs. Temperature Rev. 0 | Page 12 of 20 06665-016 5 -40 30 -40 06665-015 0 -3 0 -3 06665-014 0 2.5 0 2.5 ADR821/ADR827 0 -20 ISOURCE = 5mA CIN = COUT = 0.1F VS = 5V 0 -20 LOAD REGULATION (ppm/mA) ISOURCE = 5mA CIN = COUT = 0.1F VS = 3V LOAD REGULATION (ppm/mA) -40 -60 -80 -100 -120 -140 -40 -40 -60 -80 -100 -120 -140 -40 VS = 15V VS = 15V 06665-017 -25 -10 5 20 35 50 65 80 95 110 125 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) TEMPERATURE (C) Figure 15. ADR821 Load Regulation vs. Temperature Figure 18. ADR827 Load Regulation vs. Temperature CIN = COUT = 0.1F 15.6V p-p 2.78V rms CIN = COUT = 0.1F 8.3V p-p 1.33V rms 10V/DIV 1 5V/DIV 1 06665-018 TIME (1s/DIV) TIME (1s/DIV) Figure 16. ADR821 0.1 Hz to 10 Hz Noise CIN = COUT = 0.1F 426V p-p 55.6V rms Figure 19. ADR827 0.1 Hz to 10 Hz Noise CIN = COUT = 0.1F 258V p-p 34.6V rms 100V/DIV 1 100V/DIV 1 06665-019 TIME (1s/DIV) TIME (1s/DIV) Figure 17. ADR821 10 Hz to 10 kHz Noise Figure 20. ADR827 10 Hz to 10 kHz Noise Rev. 0 | Page 13 of 20 06665-022 06665-021 06665-020 ADR821/ADR827 CHANNEL 2: VOUT = 1V/DIV CHANNEL 2: VOUT = 500mV/DIV 2 2 Figure 21. ADR821 Turn-On Response 06665-023 Figure 22. ADR827 Turn-On Response Rev. 0 | Page 14 of 20 06665-024 1 CHANNEL 1: VIN = 2V/DIV CIN = 0F CL = 0.1F TIME = 20s/DIV 1 CHANNEL 1: VIN = 2V/DIV CIN = 0F CL = 0.1F TIME = 20s/DIV ADR821/ADR827 AMPLIFIER (AD821/AD827) 120 VSY = 15V TA = 25C 500 400 300 200 VOS (V) VSY = 15V TA = 25C 100 NUMBER OF SAMPLES 80 100 0 -100 -200 -300 -400 60 40 20 06665-025 0 100 200 300 400 500 -12 -9 -6 -3 0 VCM (V) 3 6 9 12 15 VOS (V) Figure 23. Input Offset Voltage Distribution Figure 26. Input Offset Voltage vs. Common-Mode Voltage 160 VSY = 15V 140 120 100 80 60 40 20 06665-026 200 VSY = 15V NUMBER OF SAMPLES 100 VOS (V) 0 -100 -4 -3 -2 -1 0 1 2 3 4 5 5 20 35 50 65 80 95 110 125 140 155 TCVOS (V/C) TEMPERATURE (C) Figure 24. Offset Voltage Drift Distribution Figure 27. Input Offset Voltage vs. Temperature 60 50 40 30 20 VSY = 15V TA = 25C OUTPUT SWING SATURATION VOLTAGE (mV) 100000 VSY = 15V TA = 25C 10000 1000 VOL SINKING 100 VSY - VOH SOURCING 10 IB (nA) 10 0 -10 -20 -30 06665-030 1 -7 -5 -3 -1 1 3 5 7 9 11 13 0.1 1 LOAD CURRENT (mA) 10 100 VCM (V) Figure 25. Input Bias Current vs. Common-Mode Voltage Figure 28. Output Swing Saturation Voltage vs. Load Current Rev. 0 | Page 15 of 20 06665-028 -40 -13 -11 -9 0.1 0.01 06665-027 0 -5 -200 -55 -40 -25 -10 06665-029 0 -500 -400 -300 -200 -100 -500 -15 ADR821/ADR827 70 VSY = 15V TA = 25C 120 105 90 PHASE 30 75 120 100 140 VSY = 15V TA = 25C 50 PHASE (Degrees) 60 45 CMRR (dB) 06665-031 GAIN (dB) 80 60 40 20 0 100 10 GAIN -10 30 15 0 -15 -30 -30 -45 1k 10k 100k 1M 10M 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 29. Open-Loop Gain and Phase vs. Frequency Figure 32. CMRR vs. Frequency 50 40 30 20 10 G = 10 G = 100 VSY = 15V TA = 25C 140 120 100 VSY = 15V TA = 25C PSRR (dB) ACL (dB) 0 -10 -20 -30 -40 -50 G=1 80 60 40 20 0 100 PSRR+ PSRR- 06665-032 1k 10k 100k 1M 10M 100M 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 30. Closed-Loop Gain vs. Frequency 1200 Figure 33. PSRR vs. Frequency VSY = 15V TA = 25C 1000 RLOAD = 10k CLOAD = 10pF VSY = 15V 800 600 VOUT = 2V/DIV ZOUT () 2 400 200 G = 100 0 10 100 1k 10k G = 10 100k G=1 1M 10M 06665-033 06665-036 TIME = 10s/DIV FREQUENCY (Hz) Figure 31. ZOUT vs. Frequency Figure 34. Large Signal Transient Response Rev. 0 | Page 16 of 20 06665-035 -60 100 06665-034 -50 100 -60 100M ADR821/ADR827 1000 RL = 10k CL = 10pF VSY = 15V VSY = 15V TA = 25C VOUT = 50mV/DIV 100 2 EN (nV/ Hz) 10 06665-037 TIME = 1s/DIV 1 10 100 FREQUENCY (Hz) 1000 10000 Figure 35. Small Signal Transient Response, CL = 10 pF Figure 37. Voltage Noise Density RL = 10k CL = 100pF VSY = 15V VOUT = 50mV/DIV 2 TIME = 1s/DIV Figure 36. Small Signal Transient Response, CL = 100 pF 06665-038 Rev. 0 | Page 17 of 20 06665-039 1 ADR821/ADR827 APPLICATIONS INFORMATION +2.5 V AND -2.5 V OUTPUTS (ADR821) REF V+ +IN AMP_OUT -2.5V 06665-003 REF_OUT +2.5V 0.1F fed to the amplifier noninverting input. The op amp is configured as a noninverting amplifier with a gain of +2, which produces 5 V at the output of the op amp. Using the guaranteed maximum offset voltage over the temperature, and the typical TC ratio of the resistors over the full temperature range, the output is within 15 mV of the calculated value. R1 10k V- MULTIPLE 2.5 V OUTPUTS (ADR821) REF V+ +IN AMP_OUT 2.5V REF_OUT 0.1F 2.5V 10k R2 Figure 38. +2.5 V and -2.5 V Outputs In many dual-supply applications, it is desirable to have 2.5 V references. Using the configuration shown in Figure 38, it is possible to generate -2.5 V with the help of a +2.5 V reference, an internal op amp, and 10 k resistors. The supply voltages V+ and V- should be greater than +2.8 V and -2.8 V, respectively. The op amp is configured as an inverting amplifier with a gain of -1, which produces -2.5 V at the output of the op amp. The output of the reference is fed to the amplifier inverting input. Because the op amp has very low input offset voltage (500 V over the full temperature range) and the TC ratio of the resistors is typically 25 ppm/C, the -2.5 V output is less than 7 mV away from the theoretical value. -IN Figure 40. Multiple 2.5 V Outputs 2.5 V AND 5.0 V OUTPUTS (ADR821) REF V+ +IN AMP_OUT 5.0V REF_OUT 0.1F 2.5V R1 10k V- 10k R2 06665-004 -IN Figure 39. 2.5 V and 5.0 V Outputs In many single-supply applications, it is desirable to have multiple reference voltages. Using the configuration shown in Figure 39, it is possible to generate 5.0 V with the help of a 2.5 V reference, an internal op amp, and resistors. V+ should be kept at greater than 5.8 V and V- can be connected either to ground or to negative supply. The output of the reference is On some boards, sensitive analog circuits, such as a VCO, exist with noisy digital circuits. If the supply current requirements are low (less than 3 mA), series references and op amps can be used. Using the configuration shown in Figure 40, two different 2.5 V supplies can be created using a single ADR821. The supply voltage V+ should be greater than 2.8 V and V- can be connected to ground or a negative voltage. The op amp is configured as a voltage follower with a gain of +1, which produces 2.5 V at the output of the op amp. The output of the reference is fed to the amplifier noninverting input. Because the op amp has very low input offset voltage (500 V maximum over the full temperature range), the output voltage from the op amp section tracks the reference voltage within 1 mV. For a dynamic load, such as the reference input pin on some analog-to-digital converters, the load should be connected to an op amp output and the noise sensitive circuitry, such as a VCO, should be connected to the reference output. If the dynamic load is connected to the reference voltage, any perturbations appear as a signal to the input of the voltage follower and appear on the other output. Rev. 0 | Page 18 of 20 06665-040 R1 10k V- 10k R2 ADR821/ADR827 OUTLINE DIMENSIONS 3.10 3.00 2.90 3.10 3.00 2.90 PIN 1 0.50 BSC 0.95 0.85 0.75 0.15 0.05 0.33 0.17 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-BA 1.10 MAX 8 0 0.80 0.60 0.40 10 6 5.15 4.90 4.65 1 5 SEATING PLANE 0.23 0.08 Figure 41. 10-Lead Mini Small Outline Package [MSOP] (RM-10) Dimensions shown in millimeters ORDERING GUIDE Models ADR821ARMZ-REEL71 ADR821ARMZ-R21 ADR821BRMZ-REEL71 ADR821BRMZ-R21 ADR827ARMZ-REEL71 ADR827ARMZ-R21 ADR827BRMZ-REEL71 ADR827BRMZ-R21 1 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Output Voltage (VOUT) 2.500 2.500 2.500 2.500 1.250 1.250 1.250 1.250 Initial Accuracy (mV) (%) 10.00 0.40 10.00 0.40 5.00 0.20 5.00 0.20 5.00 0.40 5.00 0.40 2.50 0.20 2.50 0.20 Temperature Coefficient (ppm/C) 30 30 15 15 30 30 15 15 Package Description 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP Package Option RM-10 RM-10 RM-10 RM-10 RM-10 RM-10 RM-10 RM-10 Ordering Quantity 1,000 250 1,000 250 1,000 250 1,000 250 Branding R2G R2G R2H R2H R0Z R0Z R2B R2B Z = RoHS Compliant Part. Rev. 0 | Page 19 of 20 ADR821/ADR827 NOTES (c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06665-0-10/07(0) Rev. 0 | Page 20 of 20 |
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