AD8421ARZ Amplifier Description


The AD8421ARZ is a low-cost, low-power, ultralow bias current, high-speed instrumentation amplifier that is well-suited for a wide range of signal conditioning and data acquisition applications. This product has an extremely high CMRR, which enables it to extract low-level signals in the presence of high-frequency common-mode noise over a wide temperature range.
The AD8421ARZ's 10 MHz bandwidth, 35 V/s slew rate, and 0.6 s settling time to 0.001 percent (G = 10) enable it to amplify high-speed signals and excel in applications requiring multiplexed systems with a large channel count. The existing feedback architecture retains great performance even at larger gains; for example, at G = 100, the bandwidth is 2 MHz and the settling time is 0.8 s. Because of its exceptional distortion performance, the AD8421ARZ is well suited for use in demanding applications such as vibration analysis.


AD8421ARZ Amplifier Features


94 dB CMRR minimum (G = 1)
Low power: 2.3 mA maximum supply current
80 dB CMRR at 20 kHz (G = 1)
1 ppm/°C maximum gain drift (G = 1)
Low noise: 3.2 nV/√Hz maximum input voltage noise at 1 kHz
±2.5 V to ±18 V dual supply (5 V to 36 V single supply)
Inputs protected to 40 V from opposite supply
0.6 μs settling time to 0.001% (G = 10)
10 MHz bandwidth (G = 1)
0.2 μV/°C maximum input offset voltage drift
500 pA maximum input bias current
2 MHz bandwidth (G = 100)
Available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC
35 V/μs slew rate
Gain set with a single resistor (G = 1 to 10,000)


AD8421ARZ Amplifier Applications


Precision data acquisition
Vibration analysis
ADC driver
Medical instrumentation
Multiplexed input applications
Microphone preamplification