Ultra-precise analogue front end

Posted By : Alex Lynn
Ultra-precise analogue front end

NJU9103 is an Analog Front End (AFE) with an integrated PGA (Programmable Gain Amplifier) that has been released by NJR at Rutronik. The product can be used to process analogue signals with an amplification of G-512. Being able to configure the front end with a microcontroller via a serial peripheral interface aims to ensure an array of application opportunities.

The internal 16-bit ΔΣ A/D converter can perform sampling rates from 0.814 to 6.51ksps and is equipped with a single ended, differential and pseudo-differential input. NJU9103 provides the optimum gain for pressure and flow sensors thanks to versatile setting options. In addition to its wide input range, NJU9103 is characterised by its small package size (DFN8/SSOP8). It is, therefore, ideal for pressure sensors, flowmeters, thermostats, digital panel meters, and PLCs.

By combining NJU09103 with an STM32F429 microcontroller from ST, cost effective sensor signal processing is a quite simple and straightforward task. Signal analysis and synthesis are easy to implement with the respective evaluation boards of the front end and the microcontroller along with a few passive components.

The sinus signal can be visualised with the aid of a connected display. It operates similar to an oscilloscope but can output additional information on the slew rate, resolution, and accuracy of NJU9103.


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