AD8421-EP Datasheet

The AD8421-EP is a low cost, low power, extremely low noise,ultralow bias current, high speed instrumentation amplifier that is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This product features extremely high CMRR, allowing it to extract low level signals in the presence of high frequency common-mode noise over a wide temperature range.

The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling time to 0.001% (G = 10) allow the AD8421-EP to amplify high speed signals and excel in applications that require high channel count, multiplexed systems. Even at higher gains, the current feedback architecture maintains high performance; for example,at G = 100, the bandwidth is 2 MHz and the settling time is 0.8 μs. The AD8421-EP has excellent distortion performance,making it suitable for use in demanding applications such as vibration analysis.

The AD8421-EP delivers 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise with only 2 mA quiescent current,making it an ideal choice for measuring low level signals. For applications with high source impedance, the AD8421-EP employs innovative process technology and design techniques to provide noise performance that is limited only by the sensor.

The AD8421-EP uses unique protection methods to ensure robust inputs while still maintaining very low noise. This protection allows input voltages up to 40 V from the opposite supply rail without damage to the part.

A single resistor sets the gain from 1 to 10,000. The referencepin can be used to apply a precise offset to the output voltage.

The AD8421-EP is specified over the military temperature range of −55°C to +125°C. It is available in an 8-lead MSOP package.

Additional application and technical information can be found in the AD8421 data sheet.