Application scheme of domestic 32-bit ultra-high resolution AFE replacing ADS1283/1284 in hydrophone sensors

Hydrophones are widely used in underwater communication, target positioning, tracking, etc. They are important components of sonar, similar to antennas in radio equipment, and are acoustic devices that emit and receive sound waves underwater. Due to the three characteristics of "weakness, wide bandwidth, and strong interference" of underwater acoustic signals, the performance of the signal acquisition chip AFE in the sensor directly determines the accuracy and reliability of underwater information acquisition. Guoxin Sichen‘s 32-bit ultra-high resolution AFE chip can replace ADS1283/1284 as a new solution for hydrophone sensors.

Guoxin Sichen‘s high-performance AFE is a single-chip high-resolution analog-to-digital converter with extremely high performance. It includes a dual channel multiplexer, a low-noise programmable gain amplifier (PGA), a multi-stage sigma delta modulator, and a digital filter combination. A dual channel multiplexer can be used for signal measurement and input switching of ADC test signals. The signal testing mode can test the background noise of the chip through internal input short circuits, which facilitates equipment diagnosis during operation. PGA has the characteristics of high input impedance and low noise. The chip‘s ultra-high dynamic range can cover a wider range of underwater sound signal scenes.

This AFE has excellent noise, linearity, and distortion performance. The modulator output is filtered and extracted by an on-chip digital filter to generate sampled data output at a set rate. The digital filter provides data rates ranging from 250 to 4000 SPS. High pass filters (HPFs) have programmable transition frequencies and bypass modes. The on-chip gain and offset calibration registers support calibration of sampled data. Synchronize input pins to control the timing of ADC conversion. Turning off the input pin can put the ADC into shutdown power-saving mode. Main features introduction:

Resolution: 32Bits

Number of channels: 2-channel differential input

Maximum sampling rate: 4kSPS

Interface: SPI

Programmable Differential Amplifier (PGA): 1-64 times voltage amplification factor

Digital power supply: 3.3V or 1.8V

Analog power supply: 5V or ± 2.5V

Package: 5mm × 4mm VQFN (24 pins with 0.5mm spacing)

Rated operating temperature range: -40 ° C to+85 ° C

Maximum operating temperature range: -50 ° C to+125 ° C