ADI's Instrumentation Amplifier for Portable Medical, Instrumentation and Consumer Devices
News Release from:
14 August 2012
ADI has today unveiled 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 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 Micro-power, Zero-Drift Instrumentation Amplifier Key Features:
• Gain Range: 1 to 1000
• CMRR: 114 dB
• DC Precision
o Input offset voltage: 75 µV
o 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
The AD8237 operates well in a system with a variety of SAR A/D converters such as the AD7988-1 ultralow power 16-bit SAR converter.
The AD8237 is available for sampling now in an 8-lead MSOP package. It has a temperature range of --40˚C to 125˚C. The AD8237 is priced at $0.93 (USD) each per 1,000.