Date: 16/08/2012

Amplifier for medical electronics with low I/P offset drift of <0.3 micro Volts/ Deg C

Analog Devices, Inc. (ADI) has introduced AD8237 micro-power, zero-drift precision instrumentation amplifier featuring low input offset drift of less than 0.3 micro Volts/ Deg C) and with input signal range that extends 300 mV beyond the supply rails. Other highlights include maximum gain error and drift of 0.005% and 0.5 ppm/°C respectively, and CMRR (common-mode rejection ratio) of 114 dB. With a low quiescent supply current of just over 100 µA, the amplifier is designed 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 Micro-power, Zero-Drift Instrumentation Amplifier Key Features:

Gain Range: 1 to 1000
CMRR: 114 dB
DC Precision
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 uVp-p
Product Sample Availability Temperature Range Price Each Per 1,000 Packaging
AD8237 Now -40°C to 125°C $0.93 8-lead MSOP