Amplifier rejects common-mode noise

With a minimum CMR of 80dB at frequencies up to 10kHz, the AD8225 instrumentation amplifier can extract low-level differential signals in the presence of high common-mode voltage levels.

With a minimum CMR of 80dB at frequencies up to 10kHz, the AD8225 instrumentation amplifier can extract low-level differential signals in the presence of high common-mode voltage levels, even at low supply voltages.

Ambient electrical noise from nearby power sources, their transmission lines, industrial equipment, motors and repair equipment on factory floors can prevent the successful processing of an intended signal.

Common mode rejection (CMR) is the ability to cancel out this unwanted noise - which is common to both amplifier inputs - while amplifying the differential signal.

The AD8225 has excellent dynamic performance, including 900kHz bandwidth, 5V/us minimum slew rate and 80dB minimum CMR to 10kHz, plus outstanding DC precision, including 86dB minimum CMR, 5ppm/C maximum gain drift, 150uV maximum input offset voltage, 2uV/C maximum offset drift, and 1.2nA maximum input bias current.

Along with industrial environments, where electrical noise is abundant, medical applications also need higher CMR performance for their highly precise applications, such as ECGs, respiration monitors, portable defibrillators, pace maker monitors, vital sign monitors, and surgical support equipment.

The ability of the AD8225 to extract signals from ambient noise makes it a superb choice in aerospace applications and instrumentation applications in bridge transducers, signal conditioning, and 4 to 20mA convertors.

The AD8225 is packaged in an 8-lead SOIC and is rated to work over the industrial temperature range, -40 to +85C.

Samples and production volumes are available now.

The AD8225 is priced at $2.95 per unit in 1000-piece quantities.

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