NJU7031D

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NJU7031D Application Field and Working Principle

NJU7031D is a high-performance, low-noise, low-power MOSFET-input instrumentation amplifier from NJRC. As a part of its linear amplifiers, instrumentation amps, op amps and buffer amps, NJU7031D features high accuracy, low noise, low power consumption and fast speed.

Features

The main characteristic features of the NJU7031D are as follows:

 
• Low power consumption: 13mA. It has an overall fourfold improvement in power consumption compared to competitors.
 
• High accuracy: the maximum input offset voltage is 1.5 mV, and the input bias current is 0.1 nA. These features lead to more accurate data sampling.
 
• Low noise: the NJU7031D has a noise level of 150nV/√Hz and a power spectral density of -90 dBV/√Hz. This makes the device ideal for high frequency applications.
 
• High speed: the device has a high slew rate of 8 V/μs, which makes it suitable for rapid data acquisition.

Applications

NJU7031D is suitable for a range of applications in the industrial, automotive, medical and aerospace sectors. Due to its high level of accuracy and low-noise, the device is well suited for applications such as:

 
• Data-acquisition systems
 
• Measurement and control systems
 
• Multi-channel analog-to-digital converters
 
• Line receivers

Working Principle

NJU7031D is based on NJR’s Class AB MOSFET input stage. This input stage is designed to provide exceptional linearity and low noise performance, which is beneficial for high-precision applications. The input stage uses two pairs of MOSFETs, operating in the linear region, to create a differential amplifier with a single-ended input. The differential output from the MOSFETs is expressed as the differential voltage between the two output pins. This differential voltage is amplified using a gain factor of up to 50 V/V and presented as the amplified output. A second gain stage utilizes an additional MOSFET to amplify the output of the first stage and provide base stability. The NJU7031D also includes an integrated feedback circuit to provide stability and accurate gain control.

Conclusion

NJU7031D is ideal for applications requiring high accuracy, fast speed, low noise and low power consumption. Its features include a high accuracy of 1.5 mV maximum input offset voltage, a low noise level of 150 nV/√Hz and a power spectral density of -90 dBV/√Hz, and a fast slew rate of 8 V/μs. It is suitable for a range of applications in the industrial, automotive, medical and aerospace sectors.

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