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 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.
|Title||Content Type||File Type|
|AD8224: Precision, Dual-Channel, JFET Input, Rail-to-Rail Instrumentation Amplifier Data Sheet (Rev C, 12/2013) (pdf, 884 kB)||Data Sheets|
|Biopotential Electrode Sensors in ECG/EEG/EMG Systems (pdf, 122 kB)||White Papers|
|A Designer's Guide to Instrumentation Amplifiers (3rd Edition)||Design Handbooks||HTML|
|Biopotential Electrode Sensors in ECG/EEG/EMG Systems (pdf, 122 kB)||Technical Articles|
(doc, 75 kB)
A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature.
High-performance Adder Uses Instrumentation Amplifiers
Make an adder circuit using instrumentation amplifiers to increase input impedance.
|Low Cost, Low Power, High Performance AED||Technical Articles||HTML|
|Biopotential Electrode Sensing in ECG, EMG, and EEG Monitors||Technical Articles||HTML|
|Biopotential Electrode Sensors in ECG/EEG/EMG Systems (pdf, 122 kB)||Technical Documentation|
|Leading Inside Advertorials: Applying Instrumentation Amplifiers EffectivelyThe Importance of an Input Ground Return (pdf, 121 kB)||Overview|
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
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|AD8224 SPICE Macro-Model||SPICE Models||HTML|
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