AD623A

AD623 AD | Alldatasheet

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REV. C 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD623 Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier CONNECTION DIAGRAM 8-Lead Plastic DIP (N), SOIC (R) and mSOIC (RM) Packages 2R G 2IN 1IN 2VS 1R G 1VS OUTPUT REF AD623 120 110 100 1 10 100 1k 10k 100k FREQUENCY – Hz CMR – dB x1000 x100 x10 Figure 1. CMR vs. Frequency, +5 V S, 0 VS

FEATURES

Higher Performance than Discrete Design Single and Dual Supply Operation Rail-to-Rail Output Swing Input Voltage Range Extends 150 mV Below Ground (Single Supply) Low Power, 575 mA Max Supply Current Gain Set with One External Resistor Gain Range 1 (No Resistor) to 1,000 HIGH ACCURACY DC PERFORMANCE 0.1% Gain Accuracy (G = 1) 0.35% Gain Accuracy (G > 1) 25 ppm Gain Drift (G = 1) 200 mV Max Input Offset Voltage (AD623A) 2 mV/8C Max Input Offset Drift (AD623A) 100 mV Max Input Offset Voltage (AD623B) 1 mV/8C Max Input Offset Drift (AD623B) 25 nA Max Input Bias Current NOISE 35 nV/ √Hz RTI Noise @ 1 kHz (G = 1) EXCELLENT AC SPECIFICATIONS 90 dB Min CMRR (G = 10); 84 dB Min CMRR (G = 5) (@ 60 Hz, 1K Source Imbalance) 800 kHz Bandwidth (G = 1) 20 ms Settling Time to 0.01% (G = 10)

APPLICATIONS

Low Power Medical Instrumentation Transducer Interface Thermocouple Amplifier Industrial Process Controls Difference Amplifier Low Power Data Acquisition PRODUCT DESCRIPTION The AD623 is an integrated single supply instrumentation am- plifier that delivers rail-to-rail output swing on a single supply (+3 V to +12 V supplies). The AD623 offers superior user flex- ibility by allowing single gain set resistor programming, and conforming to the 8-lead industry standard pinout configura- tion. With no external resistor, the AD623 is configured for unity gain (G = 1) and with an external resistor, the AD623 can be programmed for gains up to 1,000. The AD623 holds errors to a minimum by providing superior AC CMRR that increases with increasing gain. Line noise, as well as line harmonics, will be rejected since the CMRR re- mains constant up to 200 Hz. The AD623 has a wide input common- mode range and can amplify signals that have a common-mode voltage 150 mV below ground. Although the design of the AD623 has been optimized to operate from a single supply, the AD623 still provides superior performance when operated from a dual voltage supply ( ± 2.5 V to ± 6.0 V). Low power consumption (1.5 mW at 3 V), wide supply voltage range, and rail-to-rail output swing make the AD623 ideal for battery powered applications. The rail-to-rail output stage maxi- mizes the dynamic range when operating from low supply volt- ages. The AD623 replaces discrete instrumentation amplifier designs and offers superior linearity, temperature stability and reliability in a minimum of space. Until the AD623, this level of instrumentation amplifier performance has not been achieved.

–2– REV. C AD623–SPECIFICATIONS SINGLE SUPPLY Model AD623A AD623ARM AD623B Specification Conditions Min Typ Max Min Typ Max Min Typ Max Units GAIN G = 1 + (100 k/R G) Gain Range 1 1000 1 1000 1 1000 Gain Error1 G1 VOUT = 0.05 V to 3.5 V G > 1 V OUT = 0.05 V to 4.5 V Nonlinearity, G1 V OUT = 0.05 V to 3.5 V G > 1 V OUT = 0.05 V to 4.5 V G = 1–1000 50 50 50 ppm Gain vs. Temperature G = 1 5 10 5 10 5 10 ppm/ °C G > 11 50 50 50 ppm/ °C VOLTAGE OFFSET Total RTI Error = VOSI + VOSO/G Input Offset, VOSI 25 200 200 500 25 100 µV Over Temperature 350 650 160 µV Average TC 0.1 2 0.1 2 0.1 1 µV/°C Output Offset, VOSO 200 1000 500 2000 200 500 µV Over Temperature 1500 2600 1100 µV Average TC 2.5 10 2.5 10 2.5 10 µV/°C Offset Referred to the Input vs. Supply (PSR) G = 1 80 100 80 100 80 100 dB G = 10 100 120 100 120 100 120 dB G = 100 120 140 120 140 120 140 dB G = 1000 120 140 120 140 120 140 dB INPUT CURRENT Input Bias Current 17 25 17 25 17 25 nA Over Temperature 27.5 27.5 27.5 nA Average TC 25 25 25 pA/ °C Input Offset Current 0.25 2 0.25 2 0.25 2 nA Over Temperature 2.5 2.5 2.5 nA Average TC 5 5 5 pA/ °C INPUT Input Impedance Differential 2 i22 i22 i2G Ω ipF Common-Mode 2 i22 i22 i2G Ω ipF Common-Mode Rejection at

60 Hz with 1 kΩ Source

G = 1 V CM = 0 V to 3 V 70 80 70 80 77 86 dB G = 10 V CM = 0 V to 3 V 90 100 90 100 94 100 dB G = 100 V CM = 0 V to 3 V 105 110 105 110 105 110 dB G = 1000 V CM = 0 V to 3 V 105 110 105 110 105 110 dB OUTPUT DYNAMIC RESPONSE Small Signal –3 dB Bandwidth G = 1 800 800 800 kHz G = 10 100 100 100 kHz G = 100 10 10 10 kHz G = 1000 2 2 2 kHz Slew Rate 0.3 0.3 0.3 V/ µs Settling Time to 0.01% V S = +5 V G = 1 Step Size: 3.5 V 30 30 30 µs G = 10 Step Size: 4 V, VCM = 1.8 V 20 20 20 µs (typical @ +258C Single Supply, V S = +5 V, and R L = 10 kV, unless otherwise noted)

–3–REV. C AD623 DUAL SUPPLIES Model AD623A AD623ARM AD623B Specification Conditions Min Typ Max Min Typ Max Min Typ Max Units GAIN G = 1 + (100 k/R G) Gain Range 1 1000 1 1000 1 1000 Gain Error

1 G1 VOUT =

–4.8 V to 3.5 V G > 1 V OUT = 0.05 V to 4.5 V Nonlinearity, G1 V OUT = –4.8 V to 3.5 V G > 1 VOUT = –4.8 V to 4.5 V G = 1–1000 50 50 50 ppm Gain vs. Temperature G = 1 5 10 5 10 5 10 ppm/ °C G > 11 50 50 50 ppm/ °C VOLTAGE OFFSET Total RTI Error = VOSI + VOSO/G Input Offset, VOSI 25 200 200 500 25 100 µV Over Temperature 350 650 160 µV Average TC 0.1 2 0.1 2 0.1 1 µV/°C Output Offset, VOSO 200 1000 500 2000 200 500 µV Over Temperature 1500 2600 1100 µV Average TC 2.5 10 2.5 10 2.5 10 µV/°C Offset Referred to the Input vs. Supply (PSR) G = 1 80 100 80 100 80 100 dB G = 10 100 120 100 120 100 120 dB G = 100 120 140 120 140 120 140 dB G = 1000 120 140 120 140 120 140 dB INPUT CURRENT Input Bias Current 17 25 17 25 17 25 nA Over Temperature 27.5 27.5 27.5 nA Average TC 25 25 25 pA/ °C Input Offset Current 0.25 2 0.25 2 0.25 2 nA Over Temperature 2.5 2.5 2.5 nA Average TC 5 5 5 pA/ °C INPUT Input Impedance Differential 2 i22 i22 i2G Ω ipF Common-Mode 2 i22 i22 i2G Ω ipF Common-Mode Rejection at G = 1 V CM = +3.5 V to –5.15 V 70 80 70 80 77 86 dB G = 10 V CM = +3.5 V to –5.15 V 90 100 90 100 94 100 dB G = 100 V CM = +3.5 V to –5.15 V 105 110 105 110 105 110 dB G = 1000 V CM = +3.5 V to –5.15 V 105 110 105 110 105 110 dB OUTPUT DYNAMIC RESPONSE Small Signal –3 dB Bandwidth G = 1 800 800 800 kHz G = 10 100 100 100 kHz G = 100 10 10 10 kHz G = 1000 2 2 2 kHz Slew Rate 0.3 0.3 0.3 V/ µs Settling Time to 0.01% V S = ± 5 V, 5 V Step G = 1 30 30 30 µs G = 10 20 20 20 µs (typical @ +258C Dual Supply, VS = 65 V, and RL = 10 kV, unless otherwise noted)

–4– REV. C AD623–SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS 1 Storage Temperature Range Operating Temperature Range ESD SUSCEPTIBILITY ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the AD623 features proprietary ESD protection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality. BOTH DUAL AND SINGLE SUPPLIES Model AD623A AD623ARM AD623B Specification Conditions Min Typ Max Min Typ Max Min Typ Max Units NOISE Voltage Noise, 1 kHz Total RTI Noise = eni + eno /G Input, Voltage Noise, eni 35 35 35 nV/ √Hz Output, Voltage Noise, eno 50 50 50 nV/ √Hz RTI, 0.1 Hz to 10 Hz G = 1 3.0 3.0 3.0 µV p-p G = 1000 1.5 1.5 1.5 µV p-p Current Noise f = 1 kHz 100 100 100 fA/ √Hz 0.1 Hz to 10 Hz 1.5 1.5 1.5 pA p-p REFERENCE INPUT RIN 100 ± 20% 100 ± 20% 100 ± 20% k Ω IIN VIN+, VREF = 0 +50 +60 +50 +60 +50 +60 µA Voltage Range –V S +VS –VS +VS –VS +VS V Gain to Output 1 ± 0.0002 1 ± 0.0002 1 ± 0.0002 V POWER SUPPLY Operating Range Dual Supply ± 2.5 ± 6 ± 2.5 ± 6 ± 2.5 ± 6V Single Supply +2.7 +12 +2.7 +12 +2.7 +12 V Quiescent Current Dual Supply 375 550 375 550 375 550 µA Single Supply 305 480 305 480 305 480 µA Over Temperature 625 625 625 µA TEMPERATURE RANGE For Specified Performance –40 to +85 –40 to +85 –40 to +85 °C NOTES 1Does not include effects of external resistor R G. 2One input grounded. G = 1. Specifications subject to change without notice. WARNING! ESD SENSITIVE DEVICE ORDERING GUIDE Temperature Package Package Brand Model Range Description Option Code AD623AN –40 °C to +85°C 8-Lead Plastic DIP N-8 AD623AR –40 °C to +85°C 8-Lead SOIC SO-8 AD623ARM –40 °C to +85°C 8-Lead µSOIC RM-8 J0A AD623AR-REEL –40 °C to +85°C 13" Tape and Reel SO-8 AD623AR-REEL7 –40 °C to +85°C 7" Tape and Reel SO-8 AD623ARM-REEL –40 °C to +85°C 13" Tape and Reel RM-8 J0A AD623ARM-REEL7 –40 °C to +85°C 7" Tape and Reel RM-8 J0A AD623BN –40 °C to +85°C 8-Lead Plastic DIP N-8 AD623BR –40 °C to +85°C 8-Lead SOIC SO-8 AD623BR-REEL –40 °C to +85°C 13" Tape and Reel SO-8 AD623BR-REEL7 –40 °C to +85°C 7" Tape and Reel SO-8 Lead Temperature Range NOTES 1Stresses above those listed under Absolute Maximum Ratings may cause perma- nent 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. 2Specification is for device in free air: 8-Lead Plastic DIP Package: qJA = 95°C/W 8-Lead SOIC Package: qJA = 155°C/W 8-Lead µSOIC Package: qJA = 200°C/W

and C3, has a –3 dB frequency equal to: 1/(2 p (R1+R2) (C3)). in amp must drive a lower impedance load. devices to avoid degrading the circuit’s common-mode rejection. PPS film capacitors are recommended. Figure 43. Circuit to Attenuate RF Interference tance mismatch between the inputs. Figure 44. Common-Mode Shield Driver low impedance point for optimal CMR. impedance of ground returns (and hence the size of dc errors).

12 AGND V DD

Figure 45. Optimal Grounding Practice for a Bipolar Supply Environment with Separate Analog and Digital Supplies

12 DGNDVDD

Figure 46. Optimal Ground Practice in a Single Supply Environment

0.1 V below ground, it is possible to measure small differential

J-type thermocouple is grounded. Figure 50. Amplifying Bipolar Signals with Low Common- Figure 51. Simplified Block Diagram will be the lesser of the two equations. to be lower according the equation. different supply conditions in the Specifications section. the lesser of the two equations. because the REF pin must be at midsupply. enced to the voltage on the REF pin.

1. The inverting input on the AD623 is grounded. So when the

voltage of –10 mV (i.e., +IN – –IN).

–16– REV. C C3202c–0–9/99PRINTED IN U.S.A. 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84) 0.280 (7.11) 0.240 (6.10) PIN 1 SEATING PLANE0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) MIN 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) BSC 0.160 (4.06) 0.115 (2.93) 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 8-Lead SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) BSC 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 0.0196 (0.50) 0.0099 (0.25)3 458 8-Lead mSOIC (RM-8) 8 5 0.122 (3.10) 0.114 (2.90) 0.199 (5.05) 0.187 (4.75) PIN 1 0.0256 (0.65) BSC 0.122 (3.10) 0.114 (2.90) SEATING PLANE 0.006 (0.15) 0.002 (0.05) 0.018 (0.46) 0.008 (0.20) 0.043 (1.09) 0.037 (0.94) 0.120 (3.05) 0.112 (2.84) 0.011 (0.28) 0.003 (0.08) 0.028 (0.71) 0.016 (0.41) 33° 27° 0.120 (3.05) 0.112 (2.84) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Table IV. Maximum Attainable Gain and Resulting Output Swing for Different Input Conditions Supply Max Closest 1% Resulting Output VCM VDIFF REF Pin Voltages Gain Gain Resistor, V Gain Swing 0 V ± 10 mV 2.5 V +5 V 118 866 116 ± 1.2 V 0 V ± 10 mV 0 V ± 5 V 490 205 488 ± 4.8 V 0 V ± 100 mV 0 V ± 5 V 49 2.1 k 48.61 ± 4.8 V 0 V ± 1 V 0 V ± 5 V 4.9 26.1 k 4.83 ± 4.8 V 2.5 V ± 10 mV 2.5 V +5 V 242 422 238 ± 2.3 V 1.5 V ± 10 mV 1.5 V +3 V 142 715 141 ± 1.4 V 0 V ± 10 mV 1.5 V +3 V 118 866 116 ± 1.1 V