Power Electronics

Instrumentation Amplifier Combines Power Efficiency, Zero-Drift Accuracy

Analog Devices, Inc. (ADI) introduced the AD8237 micro-power, zero-drift precision instrumentation amplifier, offering a power-efficient solution for precision signal and sensor conditioning at a competitive price. The AD8237 features a low input offset drift (< 0.3µV/ºC) and an industry leading input signal range that extends 300 mV beyond the supply rails. Combined with a maximum gain error and drift of 0.005% and 0.5 ppm/°C respectively, and CMRR (common-mode rejection ratio) of 114 dB, the device offers an unmatched level of precision measurement, even at low gain.

With a low quiescent supply current of just over 100 µA, the amplifier is well suited for signal conditioning bridge, temperature and other similar sensors used in low-power designs. Target applications for the AD8237 include portable and battery-powered healthcare, consumer and precision instrumentation equipment such as infusion pumps, mobile blood pressure monitors, 4- to 20-mA sensors, gaming peripherals and consumer weigh scales.

The AD8237 operates off a single supply voltage of 1.8 V to 5.5 V and ships in a compact MSOP-8 package. The gain (1 to 1000) is set by the ratio of two external resistors, which combined with industry leading gain error performance, provides superior gain accuracy over temperature.

AD8237 Features:

  • Gain Range: 1 to 1000
  • CMRR: 114 dB
  • Input offset voltage: 75 µV
  • Offset drift: 0.3 µV/°C
  • Supply Current: 115 µA
  • Supply Range: 1.8V to 5.5V
  • Bandwidth (G=100): 10 kHz
  • Gain Error: 0.005%
  • Gain Drift: 0.5ppm/°C
  • Input Voltage Noise: 1.5 µVp-p
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