Precision instrumentation amp in MSOP offers high CMR

26 February 2003 Analogue, Mixed Signal, LSI

Analog Devices claims its AD8221 instrumentation amplifier provides the highest CMR (common mode rejection) over frequency of any instrumentation amplifier available in an MSOP package, which is half the size of a traditional SOIC package. CMR is the most important attribute of an instrumentation amplifier, and the AD8221 offers breakthrough performance of 90 dB (at G = 1) to 10 kHz. Also, the CMR of the device improves as the gain increases. The high CMR holds system errors to a minimum by rejecting common mode voltage noise to 10 kHz and beyond from sources including motors, repair equipment, switching power supplies, and high-frequency medical equipment.

Along with superior noise immunity, the company says the AD8221 also features low input offset voltage (100 µV), low input offset voltage drift (0,8 µV/°C), low gain drift (10 ppm/°C at G = 1), and low noise (7 nV per rt-Hz RTI noise at 1 kHz). The AD8221 operates at a quiescent current of 1 mA over a resistor-programmable gain range of 1 to 1000.

This device's small size makes it ideal for applications requiring multiple high-performance channels in a limited amount of space. Medical applications include equipment for monitoring ECGs, respiration, vital signs, and pacemakers, portable defibrillators, and surgical support. Industrial applications include programmable logic controllers, universal drives, sensor modules, and motor controllers.

Instrumentation and data acquisition applications include multichannel I/O boards, portable gas detectors, flowmeters, and automotive test equipment. The AD8221 in 8-pin MSOP package is specified over -40 to +85°C.

For more information contact Analog Data Products, 011 259 9400.

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