ADC GX1258 (compatible with ADS1258) for electromagnetic flow meter

Electromagnetic flowmeter is mainly used for measuring water consumption on water pipes in chemical plants. Electromagnetic flowmeter is installed on the water pipe, which has two electrodes, and the current of the electrodes is sensed by the coil, and then it is given to the ADC for AD conversion and then to the main control for data processing, which requires a low-noise ADC for processing.

GXSC GX1258 is a 16-channel 24-bit ADC, able to single conversion at 1.8k to 23.7k channel scan rate (SPS) to stabilize the acquisition of data, the GX1258 is used in electromagnetic flow meter, through the electrode coil on the water pipe electrodes to sense the current of the electrodes, and then given to the GX1258 for AD conversion processing, the output to the MCU.

From the package diagram can be seen on the core blaze technology GX1258 for the QFN48 package, the package is very small, there are 16 channels and 8 GPIOs, with I2C interface; from the parameter table can be seen, the GX1258 resolution of 24bit, the data rate of up to 125kSPS, the noise is as low as 2.8μVRMS, the common-mode rejection ratio of up to 100dB, can be seen in the noise and the common-mode rejection ratio indicators are very good.

GX1258 advantages:

1, built-in programmable gain amplifier, can improve the dynamic range of the circuit, and can be adjusted in real time ADC input signal amplitude. 2, 16-channel 24-bit, channel data rate up to 125kSPS.

3, noise as low as 2.8μVRMS, 0.02μV/°C offset drift, 0.4ppm/°C gain drift.

4, using unipolar +5V power supply operation.

5, small package size QFN48 package.