Pressure sensor module available with GX7798, replacing AD7798

The working principle of the pressure sensor module is to convert physical quantities into tiny electrical signals, amplify and convert the signals through bridge circuits, amplifiers and AD converters, and finally output digital signals. The solution communicates with the ADC through a microcontroller or other data acquisition device to collect the converted pressure data for further processing and analysis.

The AD7798 ADC is often used in electronic scales, pressure measurement, strain gauge sensors, gas analysis, industrial process control, instrumentation, portable instruments, blood analysis, smart transmitters, liquid/gas chromatography, and other fields. This article introduces a low-noise, low-drift and high-resolution 16/24-bit GX7798, which is fully compatible with the AD7798, with technical support available from GXSC.

The GX7798 integrates a programmable gain amplifier (PGA) and a low-drift on-chip reference voltage source to provide a high-precision measurement solution for bridge sensors, thermocouples, and resistance-temperature devices (RTDs). Ideally suited for pressure-sensor modules, the GX7798‘s output data rate can be configured from 4.17SPS to as high as 890SPS, with simultaneous rejection options for 50Hz/60Hz. And it provides a burn-in current source at the analog input of the sensor connection diagnostics.

The GX7798 is described as follows:

1, 1.17V/2.5V internal reference voltage source, with 4ppm/°C drift

2, Programmable gain: 1/2/4/8/16/32/64/128;

3, offset drift: 5nV/°C (gain = 128); gain drift: 1ppm/°C

4, industrial-grade temperature range: -40 ° C to 125 ° C;

5, Support 16-pin TSSOP package;