Features
Setting the Gain from 1 to 10,000 using an external resistor
High CMRR (Common Mode Rejection Ratio): 93 dB (Min), G = 10
Low Input Offset Voltage: 125 µV (Max)
Low Input Offset Voltage Drift: 0.3 µV/°C
Low Input Bias Current: 0.5 nA (Max)
Low Input Voltage Noise: 8 nV/√Hz
Low frequency noise: 2 µVP-P (0.1 to 10 Hz, G = 1)
Bandwidth: 625 kHz @ G = 10
Power supply current: 3.3 mA
Supply voltage: ± 2.4 V to ± 18 V
Wide temperature range: -40 °C to + 85 °C
Description
The AWS72922/AWS72928 is a precision, low-noise instrumentation amplifier that can be used to set the gain range from 1 to 10,000 with a single external resistor.
The AWS72922/AWS72928 is based on classic three-op-amp structure to provide high common-mode rejection ratio (CMRR) over 93dB at the gain of 10. This allows it to accurately amplify useful signals in the presence of large external interference, which is a common situation in precision data acquisition, bridge sensor interface, thermocouples, and medical signal acquisition.
The AWS72922/AWS72928 has both excellent DC and fast AC performance. Its input offset voltage is less than 125 µV, with a typical temperature drift coefficient of 0.2 µV/°C and an input bias current within 0.5 nA, significantly simplifying system calibration costs. The noise is 8 nV/√Hz at 1 kHz, and the 0.1 Hz to 10 Hz noise is 2 µVpp at the gain of 10, making it highly suitable for the first stage of precision circuits. At a gain of 10, the AWS72922/AWS72928 has a bandwidth of 625kHz, a slew rate of 2V/µs, and a 0.01% settling time of 6.3µs, making it suitable for precision multi-channel switching data acquisition systems.
AWS72922/AWS72928 guarantees performance over a wide temperature range from -40 °C to +85 °C. It can operate with a maximum supply voltage of ±18 V and a minimum supply voltage of ±2.4 V. The AWS72922/AWS72928 is available in a SOP-8L package.
