GXSC High-Performance, High-Resolution AFE Replaces ADS1283/ADS1284 for High-Precision Instruments

High-precision instruments play a vital role in promoting the development of many industries such as scientific research, industrial production and medical treatment, etc. Among the core components of these instruments, the performance of AFEs directly affects the measurement accuracy and reliability of the instruments. Its high-precision conversion capability is a key advantage when applied to high-precision instruments. This paper focuses on a GXSC high-performance high-resolution AFE to replace the ADS1283/ADS1284 applied to high-precision instruments.

In scientific research experiments, such as physics experiments on the measurement of small physical quantities, chemical analysis on the precise detection of the composition of substances, need to be able to capture the extremely small signal changes. GXSCAFE through the advanced over-sampling and digital filtering technology, the input analog signals for the detailed quantization, can distinguish extremely small voltage differences, 24-bit high-precision, to be able to these weak signals are converted into digital signals for the subsequent accurate conversion of the signal. 24-bit high precision, can accurately convert these weak signals into digital signals, for subsequent data analysis and processing to provide a precise data base.

The GXSC high-performance AFE is an extremely high-performance, single-chip, high-resolution analog-to-digital converter that internally contains a dual-channel multiplexer, a low-noise programmable gain amplifier (PGA), a multistage sigma-delta modulator, and a combination of digital filters. The dual-channel multiplexer can be used for signal measurement and input switching of ADC test signals. The signal test mode allows testing of chip noise floor by internal input shorting for easy runtime device diagnostics, and the PGA features high input impedance and low noise.

This AFE has excellent noise, linearity and distortion performance. The modulator output is filtered and extracted by an on-chip digital filter to produce a set-rate sample data output. The digital filter provides data rates from 250 to 4000 SPS. The high-pass filter (HPF) has a programmable turn frequency and bypass mode. On-chip gain and offset calibration registers support calibration of the sampled data. The synchronization input pin controls the timing of the ADC conversion. The shutdown input pin places the ADC in power-down power-saving mode.