The AD620 is a low cost, high accuracy instrumentationamplifier that requires only one external resistor to set gains of1 to 10,000. Furthermore, the AD620 features 8-lead SOIC andDIP packaging that is smaller than discrete designs and offerslower power (only 1.3 mA max supply current), making it agood fit for battery-powered, portable (or remote) applications.The AD620, with its high accuracy of 40 ppm maximumnonlinearity, low offset voltage of 50 μV max, and offset drift of0.6 μV/°C max, is ideal for use in precision data acquisitionsystems, such as weigh scales and transducer interfaces.Furthermore, the low noise, low input bias current, and low powerof the AD620 make it well suited for medical applications, suchas ECG and noninvasive blood pressure monitors.The low input bias current of 1.0 nA max is made possible withthe use of Superϐeta processing in the input stage. The AD620works well as a preamplifier due to its low input voltage noise of9 nV/√Hz at 1 kHz, 0.28 μV p-p in the 0.1 Hz to 10 Hz band,and 0.1 pA/√Hz input current noise. Also, the AD620 is wellsuited for multiplexed applications with its settling time of 15 μsto 0.01%, and its cost is low enough to enable designs with onein-amp per channel.