Product Details
●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 device’s 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 μA 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
●### Features and Benefits
● Two channels in a small 4 mm × 4 mm LFCSP
● Custom LFCSP package with hidden paddle
● Permits routing and vias underneath package
● Allows full bias current performance
● Low input currents
● 10 pA maximum input bias current (B grade)
● 0.6 pA maximum input offset current (B grade)
● High CMRR
● 100 dB CMRR (minimum), G = 10 (B grade)
● 90 dB CMRR (minimum) to 10 kHz, G = 10 (B grade)
● Excellent ac specifications and low power
● 1.5 MHz bandwidth (G = 1)
● 14 nV/√Hz input noise (1 kHz)
● Slew rate: 2 V/µs
● 750 µA quiescent current per amplifier
● Versatility
●See the AD8224 data sheet for details
