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
See the AD8224 data sheet for 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.
- Medical instrumentation
- Precision data acquisition
- Transducer interfaces
- Differential drives for high resolution input ADCs
- Remote sensors
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The AD8224-EVALZ has two AD8224 instrumentation amplifier circuits: one circuit is configured for dual-channel operation, and the other is configured for single-channel, differential output operation. The inputs, outputs, references, and supplies are routed to screw terminals for easy connectivity. See AD8224-EVALZ data sheet for further details.
Documentation & Resources
AN-1401: Instrumentation Amplifier Common-Mode Range: The Diamond Plot (Rev. 0)10/14/2016656 K
Auto-Zero Amplifiers3/1/2010DOC75 kB
High-performance Adder Uses Instrumentation Amplifiers9/3/2009
Biopotential Electrode Sensors in ECG/EEG/EMG Systems4/1/2008
Tools & Simulations
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In-Amp Diamond Plot Tool
The Diamond Plot Tool is a web application that generates a configuration-specific Output Voltage Range vs. Input Common-Mode Voltage graph, also known as the Diamond Plot, for Analog Devices Instrumentation Amplifiers. Based on user inputs such as supply voltage, gain, and input signal range, the tool detects saturation and recommends in-amps for which the input signal is in-range and the configuration is valid. Avoid saturation, find the best in-amp for your design, and save time.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.