Precision instrumentation amp in MSOP package has high CMR

10 March 2004 Analogue, Mixed Signal, LSI Perimeter Security, Alarms & Intruder Detection Products & Solutions

The AD8221 instrumentation amplifier provides the highest CMR (common mode rejection) over frequency of any instrumentation amplifier available in an MSOP package (half the size of a traditional SOIC package) according to Analog Devices. CMR is the most important attribute of an instrumentation amplifier, and the AD8221 provides high 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 immunity, 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.

The AD8221's small size makes it ideal for applications requiring multiple high-performance channels in a limited amount of space.

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