AD8237ARMZ Description

The AD8237ARMZ is a rail-to-rail input and output instrumentation amplifier with micropower and zero drift. Any gain from 1 to 1000 is set by the relative match of two resistors. With two ratio-matched resistors, the AD8237 provides exceptional gain accuracy that can be maintained at any gain.

To provide real rail-to-rail capability, the AD8237ARMZ uses an indirect current feedback architecture. The AD8237ARMZ, unlike traditional in-amps, can fully amplify signals with common-mode voltage at or slightly over its supply. This allows high common-mode voltage applications to use a smaller power supply and conserve energy. For portable systems, the AD8237ARMZ is a suitable choice. The AD8237ARMZ makes full use of a restricted power budget, offering bandwidth and drift performance ideal for bench-top systems, with a minimum supply voltage of 1.8 V, a typical supply current of 115 A, and a wide input range.

AD8237ARMZ Features

• RFI filter on-chip

• 8 kV HBM ESD rating

• 8-lead MSOP package

• Gain set with 2 external resistors

      Can achieve low gain drift at all gains

• Ideal for battery-powered instruments

      Supply current: 115 μA

      Rail-to-rail input and output

      Zero input crossover distortion

• Single-supply operation: 1.8 V to 5.5 V

• Designed for excellent dc performance

      Minimum CMRR: 106 dB

      Maximum gain error: 0.005% (all gains)

      Maximum offset voltage drift: 0.3 μV/°C

      Maximum gain drift: 0.5 ppm/°C (all gains)

      Input bias current: 1 nA guaranteed to 125°C

• Bandwidth mode pin (BW) to adjust compensation

AD8237ARMZ Applications

• Portable systems

• Bridge amplification

• Current measurement

• Pressure measurement

• Medical instrumentation

• Thermocouple interface