Low Power, Precision Reference and Op Amp ADR821/ADR827 10-lead MSOP 400 μA supply current −40°C to +125°C 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 μV offset voltage maximum 50 nA bias current maximum Unity gain stable No phase reversal FUNCTIONAL BLOCK DIAGRAM V+ 1 R1 2 ADR821/ADR827 R1 R2 GND 3 NC 4 REF V– 5 10 AMP_OUT 9 R2 8 –IN 7 +IN 6 REF_OUT NC = NO CONNECT 06665-001 FEATURES Figure 1. Table 1. Selection Table Part No. ADR827ARMZ ADR827BRMZ ADR821ARMZ ADR821BRMZ 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 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 μA 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 −40°C to +125°C. 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 ©2007 Analog Devices, Inc. All rights reserved. ADR821/ADR827 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................9 Applications....................................................................................... 1 Thermal Resistance .......................................................................9 Functional Block Diagram .............................................................. 1 ESD Caution...................................................................................9 General Description ......................................................................... 1 Pin Configuration and Function Descriptions........................... 10 Revision History ............................................................................... 2 Typical Performance Characteristics ........................................... 11 Specifications..................................................................................... 3 Reference ..................................................................................... 11 ADR821 Electrical Characteristics—Reference ....................... 3 Amplifier (AD821/AD827)....................................................... 15 ADR821 Electrical Characteristics—Amplifier (VS = ±2.8 V)................................................................................. 4 Applications Information .............................................................. 18 +2.5 V and −2.5 V Outputs (ADR821) ................................... 18 ADR821 Electrical Characteristics—Amplifier (VS = ±15 V).................................................................................. 5 2.5 V and 5.0 V Outputs (ADR821)......................................... 18 ADR827 Electrical Characteristics—Reference ....................... 6 Multiple 2.5 V Outputs (ADR821)........................................... 18 ADR827 Electrical Characteristics—Amplifier (VS = ±2.7 V)................................................................................. 7 Outline Dimensions ....................................................................... 19 Ordering Guide .......................................................................... 19 ADR827 Electrical Characteristics—Amplifier (VS = ±15 V).................................................................................. 8 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 = 25°C, CIN = COUT = 0.1 μF, unless otherwise noted. Table 2. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade Symbol VOUT Conditions Min Typ Max Unit 2.490 2.495 2.500 2.500 2.510 2.505 V V 10 0.40 5.00 0.20 mV % mV % 30 15 0.3 50 400 ppm/°C ppm/°C V ppm/V ppm/mA 80 200 600 ppm/mA ppm/mA 80 16 430 80 300 ppm/mA μV p-p μV p-p μs 400 300 μA μA 12 kΩ % ppm/°C VOERR B Grade TEMPERATURE COEFFICIENT A Grade B Grade DROPOUT (VOUT – VIN) LINE REGULATION LOAD REGULATION 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 TCVOUT VDO ∆VOUT/∆VIN ∆VOUT/∆ILOAD eN p-p tR ISY+ ISY− R1, R2 −40°C < TA < +125°C IOUT = 0 mA VIN = 2.8 V to 15 V, −40°C < TA < +125°C ILOAD = 0 mA to 5 mA, −40°C < TA < +125°C, VIN = 5 V ILOAD = 0 mA to 5 mA, VIN = 5 V ILOAD = −3 mA to 0 mA, −40°C < TA < +125°C, 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 μF 20 No load, −40°C < TA < +125°C No load, −40°C < TA < +125°C 8 TC Rev. 0 | Page 3 of 20 10 0.5 ±100 ADR821/ADR827 ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±2.8 V) VCM = 0 V, TA = 25°C, 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 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 Symbol Conditions VOS TCVOS IB IOS AVO −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C VOUT = −1.5 V to +1.5 V RLOAD = 10 kΩ, −40°C < TA < +125°C RLOAD = 2 kΩ, −40°C < TA < +125°C VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C CMRR VOH VOL ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C ISY+ ISY− PSRR No load, −40°C < TA < +125°C No load, −40°C < TA < +125°C VS = ±2.8 V to ±15 V SR GBP φM eN p-p eN Min Typ Max Unit 100 2 15 5 500 5 50 25 μV μV/°C nA nA 99 94 75 85 108 100 100 dB dB dB dB 2.6 2.55 2.7 V V V V −2.7 −2.6 −2.55 100 μA μA dB RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF 0.5 1.0 72.5 V/μs MHz Degrees f = 0.1 Hz to 10 Hz f = 1 kHz 0.2 16 μV p-p nV/√Hz Rev. 0 | Page 4 of 20 400 300 75 ADR821/ADR827 ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±15 V) VCM= 0 V, TA = 25°C, 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 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 Symbol Conditions VOS TCVOS IB IOS AVO −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C VOUT = −14 V to +14 V RLOAD = 10 kΩ, −40°C < TA < +125°C RLOAD = 2 kΩ, −40°C < TA < +125°C VCM = −14 V to +14 V, −40°C < TA < +125°C CMRR VOH ISC ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C Short-circuit current ISY+ ISY− PSRR No load, −40°C < TA < +125°C No load, −40°C < TA < +125°C VS = ±2.8 V to ±15 V SR GBP φM eN p-p eN VOL Min Typ Max Unit 100 2 10 5 500 5 50 25 μV μV/oC nA nA 109.5 100 75 85 118 111 100 dB dB dB dB 14.8 14.75 14.9 V V V V mA −14.9 −14.8 −14.75 ±20 100 μA μA dB RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF 0.5 1.0 75.4 V/μs MHz Degrees f = 0.1 Hz to 10 Hz f = 1 kHz 0.2 16 μV p-p nV/√Hz Rev. 0 | Page 5 of 20 400 300 75 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS—REFERENCE VIN = 2.7 V to 15 V, TA = 25°C, CIN = COUT = 0.1 μF, unless otherwise noted. Table 5. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade Symbol VOUT Conditions Min Typ Max Unit 1.245 1.2475 1.250 1.250 1.255 1.2525 V V 5 0.40 2.50 0.20 mV % mV % 30 15 1.45 50 400 ppm/°C ppm/°C V ppm/V ppm/mA 80 200 600 ppm/mA ppm/mA 80 8 260 80 300 ppm/mA μV p-p μV p-p μs 400 300 μA μA 12 kΩ % ppm/°C VOERR B Grade TEMPERATURE COEFFICIENT A Grade B Grade DROPOUT (VOUT – VIN) LINE REGULATION LOAD REGULATION 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 TCVOUT VDO ∆VOUT/∆VIN ∆VOUT/∆ILOAD eN p-p tR ISY+ ISY− R1, R2 −40°C < TA < +125°C IOUT = 0 mA VIN = 2.7 V to 15 V, −40°C < TA < +125°C ILOAD = 0 mA to 5 mA, −40°C < TA < +125°C, VIN = 3 V ILOAD = 0 mA to 5 mA, VIN = 3 V ILOAD = −3 mA to 0 mA, −40°C < TA < +125°C, 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 μF, COUT = 0.1 μF 20 No load, −40°C < TA < +125°C No load, −40°C < TA < +125°C 8 TC Rev. 0 | Page 6 of 20 10 0.5 ±100 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±2.7 V) VCM = 0 V, TA = 25°C, 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 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 Symbol Conditions VOS TCVOS IB IOS AVO −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C VOUT = −1.5 V to +1.5 V RLOAD = 10 kΩ, −40°C < TA < +125°C RLOAD = 2 kΩ, −40°C < TA < +125°C VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C CMRR VOH VOL ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C ISY+ ISY− PSRR No load, −40°C < TA < +125°C No load, −40°C < TA < +125°C VS = ±2.7 V to ±15 V SR GBP φM eN p-p eN Min Typ Max Unit 100 2 15 5 500 5 50 25 μV μV/°C nA nA 99 94 75 85 108 100 100 dB dB dB dB 2.5 2.45 2.6 V V V V −2.6 −2.5 −2.45 100 μA μA dB RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF 0.5 1.0 71.3 V/μs MHz Degrees f = 0.1 Hz to 10 Hz f = 1 kHz 0.2 16 μV p-p nV/√Hz Rev. 0 | Page 7 of 20 400 300 75 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±15 V) VCM = 0 V, TA = 25°C, 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 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 Symbol Conditions VOS TCVOS IB IOS AVO −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C VOUT = −14 V to +14 V RLOAD = 10 kΩ, −40°C < TA < +125°C RLOAD = 2 kΩ, −40°C < TA < +125°C VCM = −14 V to +14 V, −40°C < TA < 125°C CMRR VOH ISC ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C ILOAD = 1 mA ILOAD = 1 mA, −40°C < TA < +125°C Short-circuit current ISY+ ISY− PSRR No load, −40°C < TA < +125°C No load, −40°C < TA < +125°C VS = ±2.7 V to ±15 V SR GBP φM eN p-p eN VOL Min Typ Max Unit 100 2 10 5 500 5 50 25 μV μV/°C nA nA 109.5 100 75 85 118 111 100 dB dB dB dB 14.8 14.75 14.9 V V V V mA −14.9 −14.8 −14.75 ±20 100 μA μA dB RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 CLOAD = 14 pF CLOAD = 14 pF 0.5 1.0 75.4 V/μs MHz Degrees f = 0.1 Hz to 10 Hz f = 1 kHz 0.2 16 μV p-p nV/√Hz Rev. 0 | Page 8 of 20 400 300 75 ADR821/ADR827 ABSOLUTE MAXIMUM RATINGS TA= 25°C, unless otherwise noted. THERMAL RESISTANCE Table 8. θJA is specified for the worst-case conditions, that is, θJA is specified for device soldered in circuit board for surface-mount packages. 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 –65°C to +125°C –40°C to +125°C –65°C to +125°C 300°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. Table 9. Thermal Resistance Package Type 10-Lead MSOP (RM-10) ESD CAUTION Rev. 0 | Page 9 of 20 θJA 172 θJC 50 Unit °C/W ADR821/ADR827 V+ 1 10 AMP_OUT R1 2 9 R2 8 –IN 7 +IN 6 REF_OUT GND 3 NC 4 V– 5 ADR821/ ADR827 TOP VIEW (Not to Scale) NC = NO CONNECT 06665-002 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 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 1.260 CIN = 0.1µF COUT = 0.1µF VIN = 15V 1.256 1.254 VOUT (V) 2.504 VOUT (V) CIN = 0.1µF COUT = 0.1µF VIN = 15V 1.258 2.500 2.496 1.252 1.250 1.248 1.246 1.244 2.492 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 1.240 –40 06665-005 –25 –25 50 65 80 95 110 125 CIN = 0.1µF COUT = 0.1µF VIN = 15V 12 2 1 0 –1 10 8 6 4 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 0 –40 06665-006 5 20 35 0.40 0.35 ISY+ (mA) 0.25 +25°C 0.20 –40°C 95 110 125 +25°C 0.20 –40°C 0.15 0.15 0.10 0.10 0.05 5.0 7.5 10.0 12.5 SUPPLY VOLTAGE (±V) 15.0 06665-007 0.05 2.5 80 +125°C +125°C 0.25 65 CIN = 0.1µF COUT = 0.1µF 0.30 0.30 50 Figure 7. ADR827 Line Regulation vs. Temperature CIN = 0.1µF COUT = 0.1µF 0.35 –10 TEMPERATURE (°C) Figure 4. ADR821 Line Regulation vs. Temperature 0.40 –25 Figure 5. ADR821 Supply Current (+) vs. Supply Voltage 0 2.5 5.0 7.5 10.0 12.5 SUPPLY VOLTAGE (±V) Figure 8. ADR827 Supply Current (+) vs. Supply Voltage Rev. 0 | Page 11 of 20 15.0 06665-010 –25 06665-009 2 –2 –40 ISY+ (mA) 35 14 LINE REGULATION (ppm/V) LINE REGULATION (ppm/V) 20 Figure 6. ADR827 VOUT vs. Temperature CIN = 0.1µF COUT = 0.1µF VIN = 15V 3 5 TEMPERATURE (°C) Figure 3. ADR821 VOUT vs. Temperature 4 –10 06665-008 1.242 2.488 –40 ADR821/ADR827 0.25 CIN = 0.1µF COUT = 0.1µF 0.20 +125°C 0.20 0.15 +25°C 0.15 ISY– (mA) –40°C 0.10 0.05 +125°C +25°C –40°C 0.10 0.05 5.0 7.5 10.0 15.0 12.5 SUPPLY VOLTAGE (±V) 0 2.5 06665-011 0 2.5 1.2 5.0 7.5 10.0 15.0 12.5 SUPPLY VOLTAGE (±V) Figure 9. ADR821 Supply Current (−) vs. Supply Voltage Figure 12. ADR827 Supply Current (−) vs. Supply Voltage 2.0 CIN = 0.1µF COUT = 0.1µF CIN = 0.1µF 1.8 COUT = 0.1µF 1.0 1.6 1.4 0.8 +125°C DROPOUT (V) DROPOUT (V) CIN = 0.1µF COUT = 0.1µF 06665-014 ISY– (mA) 0.25 0.6 +25°C 0.4 –40°C –40°C 1.2 +25°C 1.0 0.8 +125°C 0.6 0.4 0.2 0 1 2 3 4 5 6 7 LOAD CURRENT (mA) 0 –3 –2 80 LOAD REGULATION (ppm/mA) ISINK = 3mA CIN = COUT = 0.1µF 40 VS = 5V 35 30 25 1 2 3 4 5 6 7 110 125 Figure 13. ADR827 Dropout vs. Load Current VS = 15V 20 15 ISINK = 3mA CIN = COUT = 0.1µF 70 60 VS = 15V 50 VS = 3V 40 10 5 –40 –25 –10 5 20 35 50 65 80 95 110 TEMPERATURE (°C) 125 06665-013 LOAD REGULATION (ppm/mA) 45 0 LOAD CURRENT (mA) Figure 10. ADR821 Dropout vs. Load Current 50 –1 06665-015 –1 06665-012 –2 06665-016 0.2 0 –3 Figure 11. ADR821 Load Regulation vs. Temperature 30 –40 –25 –10 5 20 35 50 65 80 95 TEMPERATURE (°C) Figure 14. ADR827 Load Regulation vs. Temperature Rev. 0 | Page 12 of 20 ADR821/ADR827 –20 VS = 5V –40 –60 –80 VS = 15V –100 VS = 15V –60 –80 –100 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) –140 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) Figure 15. ADR821 Load Regulation vs. Temperature Figure 18. ADR827 Load Regulation vs. Temperature CIN = COUT = 0.1µF 15.6µV p-p 2.78µV rms 5µV/DIV CIN = COUT = 0.1µF 8.3µV p-p 1.33µV rms TIME (1s/DIV) 1 06665-018 1 TIME (1s/DIV) Figure 16. ADR821 0.1 Hz to 10 Hz Noise Figure 19. ADR827 0.1 Hz to 10 Hz Noise CIN = COUT = 0.1µF 426µV p-p 55.6µV rms 100µV/DIV CIN = COUT = 0.1µF 258µV p-p 34.6µV rms TIME (1s/DIV) 06665-019 1 1 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 06665-020 –10 06665-021 –25 06665-017 –140 –40 10µV/DIV VS = 3V –40 –120 –120 100µV/DIV ISOURCE = 5mA CIN = COUT = 0.1µF 06665-022 LOAD REGULATION (ppm/mA) –20 0 ISOURCE = 5mA CIN = COUT = 0.1µF LOAD REGULATION (ppm/mA) 0 ADR821/ADR827 CHANNEL 2: VOUT = 500mV/DIV CHANNEL 2: VOUT = 1V/DIV 2 1 Figure 21. ADR821 Turn-On Response CHANNEL 1: VIN = 2V/DIV CIN = 0µF CL = 0.1µF TIME = 20µs/DIV Figure 22. ADR827 Turn-On Response Rev. 0 | Page 14 of 20 06665-024 CHANNEL 1: VIN = 2V/DIV CIN = 0µF CL = 0.1µF TIME = 20µs/DIV 06665-023 1 2 ADR821/ADR827 AMPLIFIER (AD821/AD827) 120 400 VSY = ±15V TA = 25°C 300 200 80 VOS (µV) NUMBER OF SAMPLES 100 500 VSY = ±15V TA = 25°C 60 40 100 0 –100 –200 –300 20 0 100 200 300 400 500 VOS (µV) –500 –15 06665-025 0 –500 –400 –300 –200 –100 –12 –9 –6 –3 0 3 6 9 12 15 VCM (V) Figure 23. Input Offset Voltage Distribution 06665-029 –400 Figure 26. Input Offset Voltage vs. Common-Mode Voltage 160 200 VSY = ±15V VSY = ±15V 120 100 100 VOS (µV) NUMBER OF SAMPLES 140 80 0 60 40 –100 –3 –2 –1 0 1 2 3 4 5 TCVOS (µV/°C) –200 –55 –40 –25 –10 100000 OUTPUT SWING SATURATION VOLTAGE (mV) VSY = ±15V TA = 25°C 40 30 10 0 –10 –20 –30 –5 –3 –1 1 3 5 7 9 11 VCM (V) 13 06665-030 IB (nA) 20 –7 35 50 65 80 95 110 125 140 155 Figure 27. Input Offset Voltage vs. Temperature 60 –40 –13 –11 –9 20 TEMPERATURE (°C) Figure 24. Offset Voltage Drift Distribution 50 5 VSY = ±15V TA = 25°C 10000 1000 VOL SINKING 100 VSY – VOH SOURCING 10 1 0.1 0.01 0.1 1 10 100 LOAD CURRENT (mA) Figure 28. Output Swing Saturation Voltage vs. Load Current Figure 25. Input Bias Current vs. Common-Mode Voltage Rev. 0 | Page 15 of 20 06665-028 –4 06665-026 0 –5 06665-027 20 ADR821/ADR827 70 VSY = ±15V TA = 25°C 50 120 75 45 10 30 GAIN 15 –10 0 100 CMRR (dB) 60 PHASE (Degrees) PHASE 80 60 40 –15 –30 VSY = ±15V TA = 25°C 105 90 30 –30 20 1k 10k 100k 1M –60 100M 10M 0 100 06665-031 –50 100 FREQUENCY (Hz) 1k 40 140 10M 100M VSY = ±15V TA = 25°C 120 30 20 1M Figure 32. CMRR vs. Frequency VSY = ±15V TA = 25°C G = 100 100k FREQUENCY (Hz) Figure 29. Open-Loop Gain and Phase vs. Frequency 50 10k 06665-034 –45 G = 10 100 0 G=1 PSRR (dB) ACL (dB) 10 –10 80 60 PSRR+ –20 40 –30 –40 PSRR– 20 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 0 100 06665-032 –60 100 10k 100k 1M 10M 100M FREQUENCY (Hz) Figure 30. Closed-Loop Gain vs. Frequency 1200 1k Figure 33. PSRR vs. Frequency VSY = ±15V TA = 25°C RLOAD = 10kΩ CLOAD = 10pF VSY = ±15V 1000 VOUT = 2V/DIV 800 600 400 2 200 100 1k 10k 100k FREQUENCY (Hz) G=1 1M 10M Figure 31. ZOUT vs. Frequency TIME = 10µs/DIV Figure 34. Large Signal Transient Response Rev. 0 | Page 16 of 20 06665-036 0 10 G = 10 06665-033 G = 100 06665-035 –50 ZOUT (Ω) GAIN (dB) 140 120 ADR821/ADR827 1000 VSY = ±15V TA = 25°C EN (nV/ Hz) 100 2 TIME = 1µs/DIV 1 1 10 100 1000 FREQUENCY (Hz) Figure 37. Voltage Noise Density Figure 35. Small Signal Transient Response, CL = 10 pF 2 TIME = 1µs/DIV 06665-038 VOUT = 50mV/DIV RL = 10kΩ CL = 100pF VSY = ±15V Figure 36. Small Signal Transient Response, CL = 100 pF Rev. 0 | Page 17 of 20 10000 06665-039 10 06665-037 VOUT = 50mV/DIV RL = 10kΩ CL = 10pF VSY = ±15V ADR821/ADR827 APPLICATIONS INFORMATION 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. +2.5 V AND −2.5 V OUTPUTS (ADR821) REF REF_OUT +2.5V 0.1µF V+ AMP_OUT V– R1 10kΩ 10kΩ –2.5V MULTIPLE 2.5 V OUTPUTS (ADR821) 06665-003 +IN R2 Figure 38. +2.5 V and −2.5 V Outputs REF REF_OUT 2.5V 0.1µF 2.5 V AND 5.0 V OUTPUTS (ADR821) REF REF_OUT 2.5V 0.1µF V+ AMP_OUT V– R1 10kΩ 10kΩ 5.0V R2 –IN 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 V+ +IN R1 AMP_OUT V– 10kΩ 10kΩ –IN 2.5V R2 06665-040 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 kΩ 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 μV 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. Figure 40. Multiple 2.5 V Outputs 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 μV 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 ADR821/ADR827 OUTLINE DIMENSIONS 3.10 3.00 2.90 6 10 3.10 3.00 2.90 1 5.15 4.90 4.65 5 PIN 1 0.50 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.05 0.33 0.17 SEATING PLANE 0.23 0.08 0.80 0.60 0.40 8° 0° COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-BA Figure 41. 10-Lead Mini Small Outline Package [MSOP] (RM-10) Dimensions shown in millimeters ORDERING GUIDE Models Temperature Range Output Voltage (VOUT) ADR821ARMZ-REEL71 ADR821ARMZ-R21 ADR821BRMZ-REEL71 ADR821BRMZ-R21 ADR827ARMZ-REEL71 ADR827ARMZ-R21 ADR827BRMZ-REEL71 ADR827BRMZ-R21 −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C 2.500 2.500 2.500 2.500 1.250 1.250 1.250 1.250 1 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) Package Description Package Option Ordering Quantity Branding 30 30 15 15 30 30 15 15 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP RM-10 RM-10 RM-10 RM-10 RM-10 RM-10 RM-10 RM-10 1,000 250 1,000 250 1,000 250 1,000 250 R2G R2G R2H R2H R0Z R0Z R2B R2B Z = RoHS Compliant Part. Rev. 0 | Page 19 of 20 ADR821/ADR827 NOTES ©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