Precision, Dual-Channel, JFET Input, Rail-to-Rail Instrumentation Amplifier

The AD8224 is the first single-supply, JFET input Instrumentation Amplifier available in the space-saving 16-lead, 4 mm 4 mm LFCSP. It requires the same board area as a typical single Instrumentation Amplifier yet doubles the channel density and offers a lower cost per channel without compromising performance.
Designed to meet the needs of high performance, portable instrumentation, the AD8224 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 10 kHz for G = 1. Maximum input bias current is 10 pA and typically remains below 300 pA over the entire industrial temperature range. Despite the JFET inputs, the AD8224 typically has a noise corner of only 10 Hz.
With the proliferation of Mixed-Signal processing, the number of power supplies required in each system has grown.
Designed to alleviate this problem, the AD8224 CAN operate on a 18 V dual supply, as well as on a single +5 V supply. The devices Rail-to-Rail output stage maximizes dynamic range on the low voltage supplies common in portable applications. Its ability to run on a single 5 V supply eliminates the need for higher voltage, dual supplies. The AD8224 draws 750 A of quiescent current per Amplifier making it ideal for battery powered devices.
In addition, the AD8224 CAN be configured as a single-channel, differential output, Instrumentation Amplifier Differential outputs provide high noise immunity, which CAN be useful when the output signal must travel through a noisy environment, such as with remote Sensors The configuration CAN also be used to drive differential input ADCs
For a single-channel version, use the AD8220.
Applications Medical instrumentation Precision data acquisition Transducer Interfaces Differential drives for high resolution input ADCs Remote sensors
Data Sheet, Rev. A, 4/07
By Analog Devices, Inc.