The AD8220 features an extremely low input bias current of just 4 pA (pico amps), which is less than half the level of competing components and addresses a significant source of signal error in precision instruments. The AD8220 also achieves an 80 dB common mode rejection ratio (CMRR) up to 10 kHz (G=1), while competing in-amps guarantee only 72 dB to 200 Hz. With significantly lower input bias current and higher CMRR, health care professionals can now measure heart pulses, electrical brain waves, and other patient vital signs at previously undetectable levels. The high CMRR, meanwhile, shields these signals from outside interference by rejecting electrical noise from other parts of the human body.

“For monitoring devices that measure very small electrical currents, the small package of the AD8220 enables designers to increase system channel density, which means we can fit more of these critical signal conditioning functions into a given space,” said Lew Counts, vice president, Advanced Linear Products at Analog Devices. “At the same time, we guarantee to reject high frequency noise at levels competing solutions can not. The significance is engineers designing patient monitoring equipment with ADI’s AD8220 in-amp improve overall system dynamic range and performance, without compromising on power or cost."