With the AD8221 instrumentation amp from Analog Devices, you get a 90-dB common mode rejection ratio (CMRR) to 10 kHz (at gain =1), and this CMRR improves as frequency increases. Housed in an MSOP package—half the size of the more common SOIC—this amplifier is well suited for capturing low-level sensor signals despite the presence of aggressive noise from lights, motors, power supplies, etc. Offset voltage is also very low, at 100 µV, and drift is just 0.8 µV per degree C. Other key specifications also support high performance: gain drift of 100 ppm per degree C, and low RTI noise of 7 nV per ÖH at 1 kHz. The 8-pin device, targeted at medical, sensing, and industrial applications, is US$2.25 in 1000-piece lots.
With the AD8221 instrumentation amp from Analog Devices, you get a 90-dB common mode rejection ratio (CMRR) to 10 kHz (at gain =1), and this CMRR improves as frequency increases. Housed in an MSOP package—half the size of the more common SOIC—this amplifier is well suited for capturing low-level sensor signals despite the presence of aggressive noise from lights, motors, power supplies, etc. Offset voltage is also very low, at 100 µV, and drift is just 0.8 µV per degree C. Other key specifications also support high performance: gain drift of 100 ppm per degree C, and low RTI noise of 7 nV per ÖH at 1 kHz. The 8-pin device, targeted at medical, sensing, and industrial applications, is US$2.25 in 1000-piece lots.
