GXSC analog-to-digital converter software and hardware replacement for ADS1278 applied in underwater sonar system

Underwater sonar is a technology that utilizes sound waves to propagate in water and is widely used for underwater detection, positioning, and communication. Underwater sound wave propagation is easily affected by factors such as temperature, salinity, and water flow, leading to signal attenuation, scattering, and distortion. The target echo signal is often weak and accompanied by strong environmental noise. At the same time, sonar systems need to adapt to extreme temperature, humidity, high pressure, and spatial constraints underwater, taking into account technical requirements such as the number of channels, sampling accuracy, noise performance, reliability, and power consumption of analog-to-digital converters.

The GXSC‘s 8-channel synchronous sampling 24 bit Δ - ∑ analog-to-digital converter (ADC) fully meets the requirements of underwater sonar systems. The chip can replace ADS1278 with PIN TO PIN, providing a highly integrated and reliable signal acquisition solution for underwater sonar. The comparison of domestic analog-to-digital converters and key performance parameters is as follows:

The GXSC analog-to-digital converter can choose from four modes based on speed, accuracy, and power consumption requirements: High Speed (HS) mode, which has the fastest speed and can achieve 144kSps with a 37MHz clock, and a -3dB bandwidth of 70kHz; High precision (HR) mode, with the highest accuracy, SNR up to 111.7dB, THD up to -122.9dB, and power consumption of only 20.8mW/channel; Low power (LP) mode, with the same output rate as HR mode but almost halved power consumption; Low speed (LS) mode, suitable for low-speed acquisition, with power consumption as low as 2.7mW/channel. This chip is directly controlled by PIN pins, without the need to compile registers, making it easy for engineers to use.  

Introduction to the characteristics of GXSC analog-to-digital converter:

8-channel synchronous sampling, data rate can reach 144kS/s-400kS/s

High bandwidth FIR filters and low latency SINC filters are optional

Low power consumption: HS mode: 34.0mW/channel;

HR mode: 20.8mW/channel;

LP mode: 10.9mW/channel;

LS mode: 2.7mW/channel;

Rail to rail input common mode level

Common mode rejection ratio: 116dB

Analog power supply 5V; digital power supply 1.8V

IO power supply: 1.8V~3.3V

SPI or frame synchronization interface, supporting daisy chain mode

ESD level: HBM ± 2kV, CDM ± 2kV; Latch up ± 600mA

• Operating temperature range: -40 ° C to+85 ° C

The GXSC analog-to-digital converter uses a high-order multi bit Delta sigma modulator to shape the in band noise and filter it out through an on-chip digital extraction filter, resulting in very low in band noise power. There are two types of on-chip digital filters to choose from: a high bandwidth FIR filter with an effective bandwidth of 90.6% of the Nyquist bandwidth and an in band ripple of less than ± 0.005dB; and a low latency SINC filter that can generate stable data output within 6 cycles and has better noise performance. In addition, the domestically produced analog-to-digital converter also has stable temperature characteristics, suitable for industrial applications in high temperature ranges.