●Product Details
●The AD8421 is a low cost, low power, extremely low noise, ultra-low bias current, high speed instrumentation amplifier which is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This breakthrough product features the highest CMRR available, 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 0.7 µs settling time to 0.01% (G = 1) allow the AD8421 to amplify high-speed signals and excel in applications that require high channel-count multiplexed systems. Even at high gain, the current feedback architecture preserves this performance, for example, at G = 100, the bandwidth is 2 MHz and the settling time is 0.6 µs. The AD8421 has excellent distortion performance, allowing use in demanding applications such as vibration analysis.
●The AD8421 delivers industry-leading 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 significant source impedance, the AD8421 employs novel process technology and innovative design techniques to provide groundbreaking noise performance limited only by the sensor.
●The AD8421 uses a unique input protection method to give it robust inputs while still maintaining very low noise. This input protection allows voltages 40 V from the opposite supply rail without damage.
●A single resistor sets gains between 1 and 10,000. The reference pin can be used to apply a precise offset to the output voltage.
●The AD8421 performance is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in MSOP and SOIC packages.
●Applications
● Medical instrumentation
● Precision data acquisition
● Microphone preamplification
● Vibration analysis
● Multiplexed input applications
● ADC driver
●### Features and Benefits
● Low power
● 2.3 mA maximum supply current
● Low noise
● 3.2 nV/√Hz maximum input voltage noise at 1 kHz
● 200 fA/√Hz current noise at 1 kHz
● Excellent ac specifications
● 10 MHz bandwidth (G = 1)
● 2 MHz bandwidth (G = 100)
● 0.6 µs settling time to 0.001% (G = 10)
● 80 dB CMRR to 20 kHz (G = 1)
● 35 V/µs slew rate
● See data sheet for additional features
● AD8421-EP supports defense and aerospace applications (AQEC standard)
● Download AD8421-EP data sheet (pdf)
● Military temperature range (−55°C to +125°C)
● Controlled manufacturing baseline
● One assembly/test site
● One fabrication site
● Enhanced product change notification
● Qualification data available on request
● V62/13625 DSCC Drawing Number
