Recently, while developing a product, we used a domestic high-precision ADC, the AS1412 from Yuanzi Semiconductor. We learned about its advantages: not only high precision and good linearity, but also low power consumption. It can meet the requirements for many force sensing measurements, such as various weighing scale applications, industrial equipment, instrumentation, etc.

The main components and features of the AS1412 can be seen in the figure below.

This device primarily integrates internally: 1) A MUX (multiplexer) switch for setting sampling of external signals or the internal temperature sensor; 2) A PGA (Programmable Gain Amplifier) with settable gains of ×1, ×2, ×64, ×128; 3) An ADC core and subsequent digital processing unit, capable of outputting converted data from 10Hz to 1.25kHz after oversampling; 4) An internal temperature sensor achieving +/-1℃ accuracy after 2-point calibration; 5) Auxiliary circuit units such as a bandgap reference and clock.

Below is a schematic diagram of the AS1412 used for weighing and force measurement. The ADC can directly sample the differential output signal of the sensor. The sensor excitation and ADC reference use the same voltage source to reduce system cost. Alternatively, a constant current can drive the sensor to improve anti-interference performance.

The high integration of the AS1412 chip makes the overall application circuit very concise. In terms of software, the MCU can directly read ADC conversion data via DOUT and SCLK for subsequent processing.

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