AD620_05 AD | Alldatasheet
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Rev. G Information furn ished by An alog D evices is believed to be accurate and reliable. However, n o resp onsibility is assume d b y A nalog De vices fo r 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 p atent rights of Analog De vices. Trademarks an d registered trademarks are the property of their respective owners. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
FEATURES
Gain set with one external resistor (Gain range 1 to 10,000) Wide power supply range (±2.3 V to ±18 V) Higher performance than 3 op amp IA designs Available in 8-lead DIP and SOIC packaging Low power, 1.3 mA max supply current Excellent dc performance (B grade) 50 µV max, input offset voltage 0.6 µV/°C max, input offset drift 1.0 nA max, input bias current 100 dB min common-mode rejection ratio (G = 10) Low noise 9 nV/√Hz @ 1 kHz, input voltage noise 0.28 µV p-p noise (0.1 Hz to 10 Hz) Excellent ac specifications 120 kHz bandwidth (G = 100) 15 µs settling time to 0.01%
APPLICATIONS
ECG and medical instrumentation Transducer interface Data acquisition systems Industrial process controls Battery-powered and portable equipment CONNECTION DIAGRAM –IN RG –VS +IN RG +VS OUTPUT REF 5AD620 TOP VIEW 00775-0-001 Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R) Packages good fit for battery-powered, portable (or remote) applications. systems, such as weigh scales and transducer interfaces. as ECG and noninvasive blood pressure monitors.
3 OP AMP
Figure 2. Three Op Amp IA Designs vs. AD620 Figure 3. Total Voltage Noise vs. Source Resistance
Rev. G | Page 2 of 20 TABLE OF CONTENTS
REVISION HISTORY
12/04—Rev. F to Rev. G 7/03—Data Sheet changed from REV . E to REV . F Edit to GROUND RETURNS FOR INPUT BIAS CURRENTS
Rev. G | Page 3 of 20 SPECIFICATIONS Typical @ 25°C, VS = ±15 V , and RL = 2 kΩ, unless otherwise noted. Table 1. AD620A AD620B AD620S1 Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Unit GAIN G = 1 + (49.4 kΩ/RG) Gain Range 1 10,000 1 10,000 1 10,000 Gain Error2 VOUT = ±10 V Nonlinearity VOUT = −10 V to +10 V G = 1–1000 RL = 10 kΩ 10 40 10 40 10 40 ppm G = 1–100 RL = 2 kΩ 10 95 10 95 10 95 ppm Gain vs. Temperature G = 1 10 10 10 ppm/°C Gain >12 −50 −50 −50 ppm/°C VOLTAGE OFFSET (Total RTI Error = VOSI + VOSO/G) Input Offset, VOSI VS = ±5 V to ± 15 V 30 125 15 50 30 125 µV Overtemperature VS = ±5 V to ± 15 V 185 85 225 µV Average TC VS = ±5 V to ± 15 V Output Offset, VOSO VS = ±15 V 400 1000 200 500 400 1000 µV V S = ± 5 V 1500 750 1500 µV Overtemperature VS = ±5 V to ± 15 V 2000 1000 2000 µV Average TC VS = ±5 V to ± 15 V 5.0 15 2.5 7.0 5.0 15 µV/°C Offset Referred to the Input vs. Supply (PSR) VS = ±2.3 V to ±18 V G = 1 80 100 80 100 80 100 dB G = 10 95 120 100 120 95 120 dB G = 100 110 140 120 140 110 140 dB G = 1000 110 140 120 140 110 140 dB INPUT CURRENT Overtemperature 2.5 1.5 4 nA Average TC 3.0 3.0 8.0 pA/°C Overtemperature 1.5 0.75 2.0 nA Average TC 1.5 1.5 8.0 pA/°C INPUT Input Impedance Differential 10||2 10||2 10||2 GΩ_pF Common-Mode 10||2 10||2 10||2 GΩ_pF Input Voltage Range3 VS = ±2.3 V to ±5 V V S = ± 5 V to ±18 V
Rev. G | Page 4 of 20 AD620A AD620B AD620S1 Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Unit Common-Mode Rejection Ratio DC to 60 Hz with 1 kΩ Source Imbalance VCM = 0 V to ± 10 V G = 1 73 90 80 90 73 90 dB G = 10 93 110 100 110 93 110 dB G = 100 110 130 120 130 110 130 dB G = 1000 110 130 120 130 110 130 dB OUTPUT Output Swing RL = 10 kΩ V S = ±2.3 V to ± 5 V −VS + 1.1 VS = ±5 V to ± 18 V Short Circuit Current ±18 ±18 ±18 mA DYNAMIC RESPONSE Small Signal –3 dB Bandwidth G = 1 1000 1000 1000 kHz G = 10 800 800 800 kHz G = 100 120 120 120 kHz G = 1000 12 12 12 kHz Settling Time to 0.01% 10 V Step G = 1–100 15 15 15 µs G = 1000 150 150 150 µs NOISE Voltage Noise, 1 kHz 2 2 )/()( GeeNoiseRTITotal noni += Input, Voltage Noise, eni 9 13 9 13 9 13 nV/√Hz Output, Voltage Noise, eno 72 100 72 100 72 100 nV/√Hz RTI, 0.1 Hz to 10 Hz Current Noise f = 1 kHz 100 100 100 fA/√Hz
0.1 Hz to 10 Hz 10 10 10 pA p-p
RIN 20 20 20 kΩ IIN VIN+, VREF = 0 50 60 50 60 50 60 µA Gain to Output 1 ± 0.0001 1 ± 0.0001 1 ± 0.0001 POWER SUPPLY Operating Range4 ±2.3 ±18 ±2.3 ±18 ±2.3 ±18 V Quiescent Current VS = ±2.3 V to ±18 V TEMPERATURE RANGE For Specified Performance −40 to +85 −40 to +85 −55 to +125 °C 1 See Analog Devices military data sheet for 883B tested specifications. 2 Does not include effects of external resistor RG. 3 One input grounded. G = 1. 4 This is defined as the same supply range that is used to specify PSR.
Rev. G | Page 5 of 20 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Supply Voltage ±18 V Internal Power Dissipation1 650 mW Input Voltage (Common-Mode) ±VS Differential Input Voltage 25 V Output Short-Circuit Duration Indefinite Storage Temperature Range (Q) −65°C to +150°C Storage Temperature Range (N, R) −65°C to +125°C Operating Temperature Range AD620 (A, B) −40°C to +85°C AD620 (S) −55°C to +125°C Lead Temperature Range (Soldering 10 seconds) 300°C
1 Specification is for device in free air:
8-Lead Plastic Package: θJA = 95°C 8-Lead CERDIP Package: θJA = 110°C 8-Lead SOIC Package: θJA = 155°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 condition s 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 ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Figure 4. Metallization Photograph. Dimensions shown in inches and (mm). Contact sales for latest dimensions.
Figure 38. Simplified Schematic of AD620 of performance inherent in this circuit. lower input bias current thanks to Superϐeta processing. yielding a single-ended output referred to the REF pin potential. resistance of the input devices. accurately with a single external resistor.
inputs, both contributing to the overall input error. Figure 39. Make vs. Buy Table 3. Make vs. Buy Error Budget
current of the op amp, then flows out to the load. Figure 42. Precision Voltage-to-Current Converter (Operates on 1.8 mA, ±3 V) precisely, by whatever impedance appears between Pins 1 and 8. resistors. Table 4 shows required values of RG for various gains. than 10 ppm/°C—for the best performance. Table 4. Required Values of Gain Resistors kept to a minimum for optimum CMR. All instrumentation amplifiers rectify small out of band signals.
Rev. G | Page 20 of 20 ORDERING GUIDE Model Temperature Range Package Option1 AD620AN −40°C to +85°C N-8 AD620ANZ2 −40°C to +85°C N-8 AD620BN −40°C to +85°C N-8 AD620BNZ2 −40°C to +85°C N-8 AD620AR −40°C to +85°C R-8 AD620ARZ2 −40°C to +85°C R-8 AD620AR-REEL −40°C to +85°C 13" REEL AD620ARZ-REEL2 −40°C to +85°C 13" REEL AD620AR-REEL7 −40°C to +85°C 7" REEL AD620ARZ-REEL72 −40°C to +85°C 7" REEL AD620BR −40°C to +85°C R-8 AD620BRZ2 −40°C to +85°C R-8 AD620BR-REEL −40°C to +85°C 13" REEL AD620BRZ-RL2 −40°C to +85°C 13" REEL AD620BR-REEL7 −40°C to +85°C 7" REEL AD620BRZ-R72 −40°C to +85°C 7" REEL AD620ACHIPS −40°C to +85°C Die Form AD620SQ/883B −55°C to +125°C Q-8 1 N = Plastic DIP; Q = CERDIP; R = SOIC. 2 Z = Pb-free part. © 2004 Analo g D evices, Inc. All rights reser ved. Trademarks and registered trademarks are the property of their respective owners. C00775–0–12/04(G)