AD8237ARMZ-R7 Audio Power Amplifier IC Instrumentation Amplifiers Micropower RR Zero Drift

FEATURES

• 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
• Designed for excellent dc performance Minimum CMRR: 106 dB
• Maximum offset voltage drift: 0.3 μV/°C Maximum gain error: 0.005% (all gains) 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 8 kV HBM ESD rating
• RFI filter on-chip
• Single-supply operation: 1.8 V to 5.5 V
• 8-lead MSOP package

APPLICATIONS

• Bridge amplification
• Pressure measurement
• Medical instrumentation
• Thermocouple interface
• Portable systems
• Current measurement

GENERAL DESCRIPTION

The AD8237 is a micropower, zero drift, rail-to-rail input and output instrumentation amplifier. The relative match of two resistors sets any gain from 1 to 1000. The AD8237 has excellent gain accuracy performance that can be preserved at any gain with two ratio-matched resistors.

The AD8237 employs the indirect current feedback architecture to achieve a true rail-to-rail capability. Unlike conventional in-amps, the AD8237 can fully amplify signals with common-mode voltage at or even slightly beyond its supplies. This enables applications with high common-mode voltages to use smaller supplies and save power.

The AD8237 is an excellent choice for portable systems. With a minimum supply voltage of 1.8 V, a 115 μA typical supply current, and wide input range, the AD8237 makes full use of a limited power budget, yet offers bandwidth and drift performance suitable for bench-top systems.