Analog Devices introduces the AD8220 JFET-input instrumentation amplifier. The AD8220 operates on a single low-voltage power supply that draws 700 µA. The device also achieves an 80 dB common mode rejection ratio (CMRR) up to 10 kHz (G=1). With JFET (junction field effect transistor) inputs, the AD8220 in-amp achieves a guaranteed input bias current of 20 pA, maximum, and 4 pA, typical. It specifies a 1-nA input bias current over temperature, and 2 µV/°C input offset voltage temperature drift.

The AD8220 is suited for patient monitoring systems such as ECG and EEG systems. The low input bias and high CMRR characteristics also make the AD8220 a fit for industrial automotation applications, such as electrometers and other precision instrumentation systems where extremely small currents must be measured in electrically noisy environments.

The AD8220 is currently sampling and available in an 8-lead MSOP. The AD8220 is priced at $2.29 per unit, in 1,000-piece quantities.