FEATURES EASY TO USE Gain Set with One External Resistor (Gain Range to 1000} Wide Power Supply Range 18 V) Higher Performance than Three Op Amp IA Designs Available in 8-Pin DIP and SOIC Packaging Low Power, 1.3 mA max Supply Current EXCELLENT DC PERFORMANCE ("A GRADE") 125 V max, Input Offset Voltage (50 V max "B" Grade) 1 V/C max, Input Offset Drift 2.0 nA max, Input Bias Current 93 dB min Common-Mode Rejection Ratio = 10) LOW NOISE 9 nV/ Hz, @ 1 kHz, Input Voltage Noise 0.28 V p-p Noise to 10 Hz) EXCELLENT AC SPECIFICATIONS 120 kHz Bandwidth 15 s Settling Time to 0.01% APPLICATIONS Weigh Scales ECG and Medical Instrumentation Transducer Interface Data Acquisition Systems Industrial Process Controls Battery Powered and Portable Equipment PRODUCT DESCRIPTION
CONNECTION DIAGRAM 8-Pin Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages
power (only 1.3 mA max supply current), making it a good fit for battery powered, portable (or remote) applications. The AD620, with its high accuracy of 40 ppm maximum nonlinearity, low offset voltage 50 µV max and offset drift of 0.6 µV/°C max, is ideal for use in precision data acquisition systems, such as weigh scales and transducer interfaces. Furthermore, the low noise, low input bias current, and low power of the AD620 make it well suited for medical applications such as ECG and noninvasive blood pressure monitors. The low input bias current 1.0 nA max is made possible with the use of Supereta processing in the input stage. The AD620 works well as a preamplifier due to its low input voltage noise of 9 nV/Hz at 1 kHz, 0.28 µV p-p in the 10 Hz band, 0.1 pA/Hz input current noise. Also, the AD620 is well suited for multiplexed applications with its settling time to 0.01% and its cost is low enough to enable designs with one in amp per channel.
The is a low cost, high accuracy instrumentation amplifier which requires only one external resistor to set gains to 1000. Furthermore, the AD620 features 8-pin SOIC and DIP packaging that is smaller than discrete designs, and offers lower
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Model GAIN Gain Range Gain = 1000 Nonlinearity, = 1100 Gain vs. Temperature VOLTAGE OFFSET Input Offset, VOSI Over Temperature Average TC Output Offset, V OSO Over Temperature Average TC Offset Referred to the Input vs. Supply (PSR) = 1000 INPUT CURRENT Input Bias Current Over Temperature Average TC Input Offset Current Over Temperature Average TC INPUT Input Impedance Differential Common-Mode Input Voltage Range 3 Over Temperature Over Temperature Common-Mode Rejection Ratio 60 Hz with I k Source Imbalance G= 1000 OUTPUT Output Swing Over Temperature Over Temperature Short Current Circuit Conditions G k/R G) VOUT 10 V
Model Conditions Min AD620A Typ Max Min AD620B Typ Max Min AD620S1 Typ Max Units DYNAMIC RESPONSE Small Signal 3 dB Bandwidth = 1000 Slew Rate Settling Time 10 V Step = 1000 NOISE Voltage Noise, 1 kHz Input, Voltage Noise, e ni Output, Voltage Noise, e no RTI, = 1001000 Current Noise 10 Hz REFERENCE INPUT RIN IIN Voltage Range Gain to Output POWER SUPPLY Operating Range 4 Quiescent Current Over Temperature TEMPERATURE RANGE For Specified Performance
NOTES 1 Does not include effects of external resistor G. 2 One input grounded. 1. 3 This is defined as the same supply range which is used to specify PSR. 4 See Analog Devices military data sheet for 883B tested specifications. Specifications subject to change without notice.