Low Power, Precision Reference and Op Amp ADR821/ADR827 FEATURES FUNCTIONAL BLOCK DIAGRAM 10-lead MSOP ADR821/ADR827 1 10 V+ AMP_OUT 400 μA supply current R R 1 2 −40°C to +125°C temperature range R 2 9 R 1 2 On-board precision resistors GND 3 8 –IN Reference 4 7 +IN ADR821: 2.8 V to 15 V operation NC REF ADR827: 2.7 V to 15 V operation V– 5 6 REF_OUT ±0.2% initial accuracy NC = NO CONNECT 15 ppm/°C temperature drift maximum Figure 1. +5 mA/−3 mA output drive Amplifier ADR821 ±2.8 V to ±15 V operation Table 1. Selection Table 2.8 V to 15 V single-supply operation Reference ADR827 Reference Reference Temperature ±2.7 V to ±15 V operation Part No. V Accuracy Coefficient OUT 2.7 V to 15 V single-supply operation ADR827ARMZ 1.25 V ±0.4% 30 ppm/°C Rail-to-rail input and output ADR827BRMZ 1.25 V ±0.2% 15 ppm/°C 500 μV offset voltage maximum ADR821ARMZ 2.50 V ±0.4% 30 ppm/°C 50 nA bias current maximum ADR821BRMZ 2.50 V ±0.2% 15 ppm/°C Unity gain stable No phase reversal 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 Available with the reference at 1.25 V and at 2.5 V, the and an op amp in a 10-lead mini small outline package (MSOP). ADR821/ADR827 also come in two grades. The reference on The reference and the op amp can be operated independently, the A grade offers 30 ppm/°C temperature drift performance offering the user a range of flexibility when arranging the and ±0.4% initial accuracy. The B grade provides a tighter combination. Featuring a combined operating current of less temperature drift performance of 15 ppm/°C and only ±0.2% than 400 μA and 15 ppm/°C temperature drift on the reference, initial accuracy. All versions operate from −40°C to +125°C. the ADR821/ADR827 are ideally suited for applications requir- ing precision and low power. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06665-001 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 Applications Information .............................................................. 18 (VS = ±2.8 V)................................................................................. 4 +2.5 V and −2.5 V Outputs (ADR821) ................................... 18 ADR821 Electrical Characteristics—Amplifier 2.5 V and 5.0 V Outputs (ADR821)......................................... 18 (VS = ±15 V).................................................................................. 5 Multiple 2.5 V Outputs (ADR821)........................................... 18 ADR827 Electrical Characteristics—Reference ....................... 6 Outline Dimensions....................................................................... 19 ADR827 Electrical Characteristics—Amplifier (V = ±2.7 V)................................................................................. 7 S Ordering Guide .......................................................................... 19 ADR827 Electrical Characteristics—Amplifier (V = ±15 V).................................................................................. 8 S REVISION HISTORY 10/07—Revision 0: Initial Version Rev. 0 | Page 2 of 20 ADR821/ADR827 SPECIFICATIONS ADR821 ELECTRICAL CHARACTERISTICS—REFERENCE V = 2.8 V to 15 V, T = 25°C, C = C = 0.1 μF, unless otherwise noted. IN A IN OUT Table 2. Parameter Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE VOUT A Grade 2.490 2.500 2.510 V B Grade 2.495 2.500 2.505 V INITIAL ACCURACY VOERR A Grade 10 mV 0.40 % B Grade 5.00 mV 0.20 % TEMPERATURE COEFFICIENT TCV −40°C < T < +125°C OUT A A Grade 30 ppm/°C B Grade 15 ppm/°C DROPOUT (V – V) V I = 0 mA 0.3 V OUT IN DO OUT LINE REGULATION ∆VOUT/∆VIN VIN = 2.8 V to 15 V, −40°C < TA < +125°C 20 50 ppm/V LOAD REGULATION ∆VOUT/∆ILOAD ILOAD = 0 mA to 5 mA, −40°C < TA < +125°C, 400 ppm/mA VIN = 5 V I = 0 mA to 5 mA, V = 5 V 80 200 ppm/mA LOAD IN I = −3 mA to 0 mA, −40°C < T < +125°C, 600 ppm/mA LOAD A V = 5 V IN ILOAD = −3 mA to +5 mA, VIN = 5 V 80 300 ppm/mA VOLTAGE NOISE e 0.1 Hz to 10 Hz 16 μV p-p N p-p BROADBAND NOISE 10 Hz to 10 kHz 430 μV p-p TURN-ON SETTLING TIME tR CIN = 0 μF 80 μs POWER SUPPLY Positive Supply Current I No load, −40°C < T < +125°C 400 μA SY+ A Negative Supply Current ISY− No load, −40°C < TA < +125°C 300 μA ON-BOARD RESISTORS R , R 1 2 Resistor Tolerance 8 10 12 kΩ Resistor Matching 0.5 % Resistor Temperature Coefficient TC ±100 ppm/°C Rev. 0 | Page 3 of 20 ADR821/ADR827 ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (V = ±2.8 V) S VCM = 0 V, TA = 25°C, unless otherwise noted. Table 3. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Input Offset Voltage VOS −40°C < TA < +125°C 100 500 μV Input Offset Voltage Drift TCVOS −40°C < TA < +125°C 2 5 μV/°C Input Bias Current IB −40°C < TA < +125°C 15 50 nA Input Offset Bias Current I −40°C < T < +125°C 5 25 nA OS A Large Signal Voltage Gain A V = −1.5 V to +1.5 V VO OUT RLOAD = 10 kΩ, −40°C < TA < +125°C 99 108 dB RLOAD = 2 kΩ, −40°C < TA < +125°C 94 100 dB Common-Mode Rejection Ratio CMRR VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C 75 100 dB 85 dB OUTPUT CHARACTERISTICS Output Voltage High VOH ILOAD = 1 mA 2.6 2.7 V I = 1 mA, −40°C < T < +125°C 2.55 V LOAD A Output Voltage Low V I = 1 mA −2.7 −2.6 V OL LOAD I = 1 mA, −40°C < T < +125°C −2.55 V LOAD A POWER SUPPLY Positive Supply Current I No load, −40°C < T < +125°C 400 μA SY+ A Negative Supply Current ISY− No load, −40°C < TA < +125°C 300 μA Power Supply Rejection Ratio PSRR VS = ±2.8 V to ±15 V 75 100 dB DYNAMIC PERFORMANCE Slew Rate SR RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 0.5 V/μs Gain Bandwidth Product GBP CLOAD = 14 pF 1.0 MHz Phase Margin φM CLOAD = 14 pF 72.5 Degrees NOISE PERFORMANCE Voltage Noise eN p-p f = 0.1 Hz to 10 Hz 0.2 μV p-p Voltage Noise Density eN f = 1 kHz 16 nV/√Hz Rev. 0 | Page 4 of 20 ADR821/ADR827 ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (V = ±15 V) S VCM= 0 V, TA = 25°C, unless otherwise noted. Table 4.A Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Input Offset Voltage VOS −40°C < TA < +125°C 100 500 μV o Input Offset Voltage Drift TCVOS −40°C < TA < +125°C 2 5 μV/ C Input Bias Current IB −40°C < TA < +125°C 10 50 nA Input Offset Bias Current I −40°C < T < +125°C 5 25 nA OS A Large Signal Voltage Gain A V = −14 V to +14 V VO OUT RLOAD = 10 kΩ, −40°C < TA < +125°C 109.5 118 dB RLOAD = 2 kΩ, −40°C < TA < +125°C 100 111 dB Common-Mode Rejection Ratio CMRR VCM = −14 V to +14 V, −40°C < TA < +125°C 75 100 dB 85 dB OUTPUT CHARACTERISTICS Output Voltage high VOH ILOAD = 1 mA 14.8 14.9 V I = 1 mA, −40°C < T < +125°C 14.75 V LOAD A Output Voltage Low V I = 1 mA −14.9 −14.8 V OL LOAD I = 1 mA, −40°C < T < +125°C −14.75 V LOAD A Output Current ISC Short-circuit current ±20 mA POWER SUPPLY Positive Supply Current ISY+ No load, −40°C < TA < +125°C 400 μA Negative Supply Current ISY− No load, −40°C < TA < +125°C 300 μA Power Supply Rejection Ratio PSRR VS = ±2.8 V to ±15 V 75 100 dB DYNAMIC PERFORMANCE Slew Rate SR RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 0.5 V/μs Gain Bandwidth Product GBP CLOAD = 14 pF 1.0 MHz Phase Margin φ C = 14 pF 75.4 Degrees M LOAD NOISE PERFORMANCE Voltage Noise eN p-p f = 0.1 Hz to 10 Hz 0.2 μV p-p Voltage Noise Density e f = 1 kHz 16 nV/√Hz N Rev. 0 | Page 5 of 20 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 Symbol Conditions Min Typ Max Unit OUTPUT VOLTAGE V OUT A Grade 1.245 1.250 1.255 V B Grade 1.2475 1.250 1.2525 V INITIAL ACCURACY V OERR A Grade 5 mV 0.40 % B Grade 2.50 mV 0.20 % TEMPERATURE COEFFICIENT TCVOUT −40°C < TA < +125°C A Grade 30 ppm/°C B Grade 15 ppm/°C DROPOUT (VOUT – VIN) VDO IOUT = 0 mA 1.45 V LINE REGULATION ∆VOUT/∆VIN VIN = 2.7 V to 15 V, −40°C < TA < +125°C 20 50 ppm/V LOAD REGULATION ∆V /∆I I = 0 mA to 5 mA, −40°C < T < +125°C, 400 ppm/mA OUT LOAD LOAD A VIN = 3 V ILOAD = 0 mA to 5 mA, VIN = 3 V 80 200 ppm/mA ILOAD = −3 mA to 0 mA, −40°C < TA < +125°C, 600 ppm/mA V = 3 V IN I = −3 mA to +5 mA, V = 3 V 80 300 ppm/mA LOAD IN VOLTAGE NOISE eN p-p 0.1 Hz to 10 Hz 8 μV p-p BROADBAND NOISE 10 Hz to 10 kHz 260 μV p-p TURN-ON SETTLING TIME t C = 0 μF, C = 0.1 μF 80 μs R IN OUT POWER SUPPLY Positive Supply Current I No load, −40°C < T < +125°C 400 μA SY+ A Negative Supply Current I No load, −40°C < T < +125°C 300 μA SY− A ON-BOARD RESISTORS R1, R2 Resistor Tolerance 8 10 12 kΩ Resistor Matching 0.5 % Resistor Temperature Coefficient TC ±100 ppm/°C Rev. 0 | Page 6 of 20 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (V = ±2.7 V) S VCM = 0 V, TA = 25°C, unless otherwise noted. Table 6. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Input Offset Voltage VOS −40°C < TA < +125°C 100 500 μV Input Offset Voltage Drift TCVOS −40°C < TA < +125°C 2 5 μV/°C Input Bias Current IB −40°C < TA < +125°C 15 50 nA Input Offset Bias Current I −40°C < T < +125°C 5 25 nA OS A Large Signal Voltage Gain A V = −1.5 V to +1.5 V VO OUT RLOAD = 10 kΩ, −40°C < TA < +125°C 99 108 dB RLOAD = 2 kΩ, −40°C < TA < +125°C 94 100 dB Common-Mode Rejection Ratio CMRR VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C 75 100 dB 85 dB OUTPUT CHARACTERISTICS Output Voltage High VOH ILOAD = 1 mA 2.5 2.6 V I = 1 mA, −40°C < T < +125°C 2.45 V LOAD A Output Voltage Low V I = 1 mA −2.6 −2.5 V OL LOAD I = 1 mA, −40°C < T < +125°C −2.45 V LOAD A POWER SUPPLY Positive Supply Current I No load, −40°C < T < +125°C 400 μA SY+ A Negative Supply Current ISY− No load, −40°C < TA < +125°C 300 μA Power Supply Rejection Ratio PSRR VS = ±2.7 V to ±15 V 75 100 dB DYNAMIC PERFORMANCE Slew Rate SR RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 0.5 V/μs Gain Bandwidth Product GBP CLOAD = 14 pF 1.0 MHz Phase Margin φM CLOAD = 14 pF 71.3 Degrees NOISE PERFORMANCE Voltage Noise eN p-p f = 0.1 Hz to 10 Hz 0.2 μV p-p Voltage Noise Density eN f = 1 kHz 16 nV/√Hz Rev. 0 | Page 7 of 20 ADR821/ADR827 ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (V = ±15 V) S VCM = 0 V, TA = 25°C, unless otherwise noted. Table 7. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Input Offset Voltage VOS −40°C < TA < +125°C 100 500 μV Input Offset Voltage Drift TCVOS −40°C < TA < +125°C 2 5 μV/°C Input Bias Current IB −40°C < TA < +125°C 10 50 nA Input Offset Bias Current I −40°C < T < +125°C 5 25 nA OS A Large Signal Voltage Gain A V = −14 V to +14 V VO OUT RLOAD = 10 kΩ, −40°C < TA < +125°C 109.5 118 dB RLOAD = 2 kΩ, −40°C < TA < +125°C 100 111 dB Common-Mode Rejection Ratio CMRR VCM = −14 V to +14 V, −40°C < TA < 125°C 75 100 dB 85 dB OUTPUT CHARACTERISTICS Output Voltage High VOH ILOAD = 1 mA 14.8 14.9 V I = 1 mA, −40°C < T < +125°C 14.75 V LOAD A Output Voltage Low V I = 1 mA −14.9 −14.8 V OL LOAD I = 1 mA, −40°C < T < +125°C −14.75 V LOAD A Output Current ISC Short-circuit current ±20 mA POWER SUPPLY Positive Supply Current ISY+ No load, −40°C < TA < +125°C 400 μA Negative Supply Current ISY− No load, −40°C < TA < +125°C 300 μA Power Supply Rejection Ratio PSRR VS = ±2.7 V to ±15 V 75 100 dB DYNAMIC PERFORMANCE Slew Rate SR RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1 0.5 V/μs Gain Bandwidth Product GBP CLOAD = 14 pF 1.0 MHz Phase Margin φ C = 14 pF 75.4 Degrees M LOAD NOISE PERFORMANCE Voltage Noise eN p-p f = 0.1 Hz to 10 Hz 0.2 μV p-p Voltage Noise Density e f = 1 kHz 16 nV/√Hz N Rev. 0 | Page 8 of 20 ADR821/ADR827 ABSOLUTE MAXIMUM RATINGS TA= 25°C, unless otherwise noted. THERMAL RESISTANCE θJA is specified for the worst-case conditions, that is, θJA is Table 8. specified for device soldered in circuit board for surface-mount Parameter Rating packages. Supply Voltage ±18 V Output Short-Circuit Duration to GND Indefinite Table 9. Thermal Resistance Storage Temperature Range –65°C to +125°C Package Type θ θ Unit JA JC Operating Temperature Range –40°C to +125°C 10-Lead MSOP (RM-10) 172 50 °C/W Junction Temperature Range –65°C to +125°C Lead Temperature (Soldering, 60 sec) 300°C Stresses above those listed under Absolute Maximum Ratings ESD CAUTION 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. 0 | Page 9 of 20 ADR821/ADR827 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS V+ 1 10 AMP_OUT R 2 9 R 1 2 ADR821/ GND 3 ADR827 8 –IN TOP VIEW NC 4 7 +IN (Not to Scale) V– 5 6 REF_OUT NC = NO CONNECT Figure 2. Pin Configuration Table 10. Pin Function Descriptions Pin No. Mnemonic Description 1 V+ Input Voltage of the Reference/Positive Supply of the Amplifier 2 R Resistance Tied to Positive Input of the Amplifier 1 3 GND Ground 4 NC Do Not Connect Any External Components to This Pin 5 V− Negative Supply of the Amplifier 6 REF_OUT Output Voltage of the Reference 7 +IN Positive Input of the Amplifier 8 −IN Negative Input of the Amplifier 9 R2 Resistance Tied to Positive Input of the Amplifier 10 AMP_OUT Output Pin of the Amplifier Rev. 0 | Page 10 of 20 06665-002 ADR821/ADR827 TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE 2.512 1.260 C = 0.1µF C = 0.1µF IN IN C = 0.1µF C = 0.1µF OUT 1.258 OUT V = 15V V = 15V IN IN 2.508 1.256 1.254 2.504 1.252 2.500 1.250 1.248 2.496 1.246 1.244 2.492 1.242 2.488 1.240 –40 –25 –10 5 20 35 50 65 80 95 110 125 –40 –25 –10 5 20 355065 8095 110 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 3. ADR821 V vs. Temperature Figure 6. ADR827 V vs. Temperature OUT OUT 4 14 C = 0.1µF IN C = 0.1µF IN C = 0.1µF OUT C = 0.1µF OUT V = 15V IN V = 15V 12 IN 3 10 2 8 1 6 0 4 –1 2 –2 0 –40 –25 –10 5 20 35 50 65 80 95 110 125 –40 –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 0.40 C = 0.1µF C = 0.1µF IN IN C = 0.1µF C = 0.1µF OUT OUT 0.35 0.35 0.30 0.30 +125°C +125°C 0.25 +25°C 0.25 +25°C 0.20 –40°C 0.20 –40°C 0.15 0.15 0.10 0.10 0.05 0.05 0 2.5 5.0 7.5 10.0 12.5 15.0 2.5 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 I (mA) V (V) SY+ OUT LINE REGULATION (ppm/V) 06665-006 06665-005 06665-007 I (mA) V (V) SY+ OUT LINE REGULATION (ppm/V) 06665-009 06665-010 06665-008 ADR821/ADR827 0.25 0.25 C = 0.1µF C = 0.1µF IN IN C = 0.1µF C = 0.1µF OUT OUT 0.20 +125°C 0.20 +125°C 0.15 +25°C 0.15 +25°C –40°C –40°C 0.10 0.10 0.05 0.05 0 0 2.5 5.0 7.5 10.0 12.5 15.0 2.5 5.0 7.5 10.0 12.5 15.0 SUPPLY VOLTAGE (±V) SUPPLY VOLTAGE (±V) Figure 9. ADR821 Supply Current (−) vs. Supply Voltage Figure 12. ADR827 Supply Current (−) vs. Supply Voltage 1.2 2.0 C = 0.1µF C = 0.1µF IN IN C = 0.1µF C = 0.1µF OUT OUT 1.8 1.0 1.6 1.4 –40°C 0.8 +125°C 1.2 +25°C 0.6 1.0 +25°C 0.8 +125°C 0.4 –40°C 0.6 0.4 0.2 0.2 0 0 –3 –2 –1 0 123456 7 –3 –2 –1 0 1 2 3 4 5 6 7 LOAD CURRENT (mA) LOAD CURRENT (mA) Figure 10. ADR821 Dropout vs. Load Current Figure 13. ADR827 Dropout vs. Load Current 50 80 I = 3mA I = 3mA SINK SINK C = C = 0.1µF C = C = 0.1µF IN OUT IN OUT 45 70 40 V = 5V S 35 V = 15V 60 S 30 25 V = 15V S V = 3V S 50 20 15 40 10 5 30 –40 –25 –10 5 20 35 50 65 80 95 110 125 –40 –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 I (mA) LOAD REGULATION (ppm/mA) DROPOUT (V) SY– 06665-013 06665-012 06665-011 I (mA) LOAD REGULATION (ppm/mA) DROPOUT (V) SY– 06665-016 06665-015 06665-014 ADR821/ADR827 0 0 I = 5mA I = 5mA SOURCE SOURCE C = C = 0.1µF C = C = 0.1µF IN OUT IN OUT –20 –20 V = 3V S V = 5V S –40 –40 V = 15V –60 –60 S –80 –80 V = 15V S –100 –100 –120 –120 –140 –140 –40 –25 –10 5 20 35 50 65 80 95 110 125 –40 –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 C = C = 0.1µF C = C = 0.1µF IN OUT IN OUT 15.6µV p-p 8.3µV p-p 2.78µV rms 1.33µV rms 1 1 TIME (1s/DIV) TIME (1s/DIV) Figure 16. ADR821 0.1 Hz to 10 Hz Noise Figure 19. ADR827 0.1 Hz to 10 Hz Noise C = C = 0.1µF C = C = 0.1µF IN OUT IN OUT 258µV p-p 426µV p-p 34.6µV rms 55.6µV rms 1 1 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 LOAD REGULATION (ppm/mA) 100µV/DIV 10µV/DIV 06665-019 06665-018 06665-017 LOAD REGULATION (ppm/mA) 100µV/DIV 5µV/DIV 06665-022 06665-021 06665-020 ADR821/ADR827 CHANNEL 2: CHANNEL 2: V = 500mV/DIV V = 1V/DIV OUT OUT 2 2 CHANNEL 1: CHANNEL 1: V = 2V/DIV V = 2V/DIV IN IN C = 0µF C = 0µF IN IN C = 0.1µF C = 0.1µF 1 1 L L TIME = 20µs/DIV TIME = 20µs/DIV Figure 21. ADR821 Turn-On Response Figure 22. ADR827 Turn-On Response Rev. 0 | Page 14 of 20 06665-023 06665-024 ADR821/ADR827 AMPLIFIER (AD821/AD827) 120 500 V = ±15V SY V = ±15V T = 25°C SY 400 A T = 25°C A 100 300 200 80 100 60 0 –100 40 –200 –300 20 –400 0 –500 –500 –400 –300 –200 –100 0 100 200 300 400 500 –15–12 –9 –6 –3 0369 12 15 V (µV) V (V) OS CM Figure 23. Input Offset Voltage Distribution Figure 26. Input Offset Voltage vs. Common-Mode Voltage 160 200 V = ±15V V = ±15V SY SY 140 120 100 100 80 0 60 40 –100 20 0 –200 –5 –4 –3 –2 –1 0 1 2 3 4 5 –55 –40 –25 –10 5 20 35 50 65 80 95 110 125 140 155 TCV (µV/°C) OS TEMPERATURE (°C) Figure 24. Offset Voltage Drift Distribution Figure 27. Input Offset Voltage vs. Temperature 100000 60 V = ±15V SY V = ±15V T = 25°C SY A 50 T = 25°C A 10000 40 30 1000 20 V SINKING OL 100 10 V – V SOURCING 0 SY OH 10 –10 –20 1 –30 0.1 –40 0.01 0.1 1 10 100 –13 –11 –9 –7 –5 –3 –1 1 3 5 7 9 11 13 V (V) LOAD CURRENT (mA) CM Figure 28. Output Swing Saturation Voltage vs. Load Current Figure 25. Input Bias Current vs. Common-Mode Voltage Rev. 0 | Page 15 of 20 NUMBER OF SAMPLES I (nA) NUMBER OF SAMPLES B 06665-030 06665-026 06665-025 OUTPUT SWING SATURATION VOLTAGE (mV) V (µV) V (µV) OS OS 06665-027 06665-029 06665-028 ADR821/ADR827 70 120 140 V = ±15V V = ±15V SY SY 105 T = 25°C T = 25°C A A 120 50 90 75 PHASE 100 30 60 45 80 10 30 GAIN 60 15 –10 0 40 –15 –30 –30 20 –45 –50 –60 0 100 1k 10k 100k 1M 10M 100M 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 29. Open-Loop Gain and Phase vs. Frequency Figure 32. CMRR vs. Frequency 50 140 V = ±15V V = ±15V SY SY G = 100 40 T = 25°C T = 25°C A A 120 30 G = 10 20 100 10 G = 1 80 0 –10 60 PSRR+ –20 40 –30 PSRR– –40 20 –50 –60 0 100 1k 10k 100k 1M 10M 100M 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 30. Closed-Loop Gain vs. Frequency Figure 33. PSRR vs. Frequency 1200 V = ±15V SY R = 10kΩ LOAD T = 25°C A C = 10pF LOAD V = ±15V SY 1000 800 600 2 400 200 G = 100 G = 10 G = 1 0 10 100 1k 10k 100k 1M 10M TIME = 10µs/DIV FREQUENCY (Hz) Figure 31. ZOUT vs. Frequency Figure 34. Large Signal Transient Response Rev. 0 | Page 16 of 20 GAIN (dB) A (dB) Z (Ω) CL OUT 06665-033 06665-032 PHASE (Degrees) 06665-031 PSRR (dB) CMRR (dB) V = 2V/DIV OUT 06665-036 06665-035 06665-034 ADR821/ADR827 1000 V = ±15V R = 10kΩ SY L T = 25°C C = 10pF A L V = ±15V SY 100 2 10 1 TIME = 1µs/DIV 1 10 100 1000 10000 FREQUENCY (Hz) Figure 35. Small Signal Transient Response, C = 10 pF Figure 37. Voltage Noise Density L R = 10kΩ L C = 100pF L V = ±15V SY 2 TIME = 1µs/DIV Figure 36. Small Signal Transient Response, CL = 100 pF Rev. 0 | Page 17 of 20 V = 50mV/DIV V = 50mV/DIV OUT OUT 06665-038 06665-037 EN (nV/ Hz) 06665-039 ADR821/ADR827 APPLICATIONS INFORMATION fed to the amplifier noninverting input. The op amp is config- +2.5 V AND −2.5 V OUTPUTS (ADR821) ured as a noninverting amplifier with a gain of +2, which produces 5 V at the output of the op amp. Using the guaranteed REF_OUT +2.5V REF maximum offset voltage over the temperature, and the typical 0.1µF V+ TC ratio of the resistors over the full temperature range, the +IN AMP_OUT output is within 15 mV of the calculated value. –2.5V MULTIPLE 2.5 V OUTPUTS (ADR821) V– R R 1 10kΩ 10kΩ 2 REF_OUT 2.5V Figure 38. +2.5 V and −2.5 V Outputs REF 0.1µF V+ In many dual-supply applications, it is desirable to have ±2.5 V +IN AMP_OUT references. Using the configuration shown in Figure 38, it is 2.5V 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+ V– 10kΩ 10kΩ R 1 R and V− should be greater than +2.8 V and −2.8 V, respectively. 2 The op amp is configured as an inverting amplifier with a gain –IN of −1, which produces −2.5 V at the output of the op amp. The Figure 40. Multiple 2.5 V Outputs output of the reference is fed to the amplifier inverting input. Because the op amp has very low input offset voltage (500 μV On some boards, sensitive analog circuits, such as a VCO, exist over the full temperature range) and the TC ratio of the with noisy digital circuits. If the supply current requirements resistors is typically ±25 ppm/°C, the −2.5 V output is less than are low (less than 3 mA), series references and op amps can be 7 mV away from the theoretical value. used. Using the configuration shown in Figure 40, two different 2.5 V supplies can be created using a single ADR821. The supply 2.5 V AND 5.0 V OUTPUTS (ADR821) voltage V+ should be greater than 2.8 V and V− can be con- nected to ground or a negative voltage. The op amp is configured REF_OUT 2.5V REF as a voltage follower with a gain of +1, which produces 2.5 V at 0.1µF the output of the op amp. The output of the reference is fed V+ +IN to the amplifier noninverting input. Because the op amp has AMP_OUT 5.0V very low input offset voltage (500 μV maximum over the full temperature range), the output voltage from the op amp section V– R R tracks the reference voltage within 1 mV. For a dynamic load, 1 10kΩ 10kΩ 2 such as the reference input pin on some analog-to-digital converters, the load should be connected to an op amp output –IN and the noise sensitive circuitry, such as a VCO, should be Figure 39. 2.5 V and 5.0 V Outputs connected to the reference output. If the dynamic load is con- In many single-supply applications, it is desirable to have nected to the reference voltage, any perturbations appear as a multiple reference voltages. Using the configuration shown in signal to the input of the voltage follower and appear on the Figure 39, it is possible to generate 5.0 V with the help of a other output. 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 Rev. 0 | Page 18 of 20 06665-004 06665-003 06665-040 ADR821/ADR827 OUTLINE DIMENSIONS 3.10 3.00 2.90 10 6 5.15 3.10 4.90 3.00 4.65 2.90 1 5 PIN 1 0.50 BSC 0.95 0.85 1.10 MAX 0.75 0.80 8° 0.15 0.60 0.33 SEATING 0.23 0° 0.05 PLANE 0.40 0.17 0.08 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 Initial Output Temperature Accuracy Temperature Voltage Coefficient Package Package Ordering Models Range (VOUT) (mV) (%) (ppm/°C) Description Option Quantity Branding 1 ADR821ARMZ-REEL7 −40°C to +125°C 2.500 10.00 ±0.40 30 10-Lead MSOP RM-10 1,000 R2G 1 ADR821ARMZ-R2 −40°C to +125°C 2.500 10.00 ±0.40 30 10-Lead MSOP RM-10 250 R2G 1 ADR821BRMZ-REEL7 −40°C to +125°C 2.500 5.00 ±0.20 15 10-Lead MSOP RM-10 1,000 R2H 1 ADR821BRMZ-R2 −40°C to +125°C 2.500 5.00 ±0.20 15 10-Lead MSOP RM-10 250 R2H 1 ADR827ARMZ-REEL7 −40°C to +125°C 1.250 5.00 ±0.40 30 10-Lead MSOP RM-10 1,000 R0Z 1 ADR827ARMZ-R2 −40°C to +125°C 1.250 5.00 ±0.40 30 10-Lead MSOP RM-10 250 R0Z 1 ADR827BRMZ-REEL7 −40°C to +125°C 1.250 2.50 ±0.20 15 10-Lead MSOP RM-10 1,000 R2B 1 ADR827BRMZ-R2 −40°C to +125°C 1.250 2.50 ±0.20 15 10-Lead MSOP RM-10 250 R2B 1 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