The GX1278 analog-to-digital converter is software and hardware compatible with the ADS1278 and is used in sonar systems.

Sonar is a technology that utilizes the propagation and reflection characteristics of sound waves in water, combined with electroacoustic conversion and information processing, for navigation and ranging. This technology enables electronic devices to detect and communicate with underwater targets. Sonar systems operate by emitting sound waves and receiving the echoes reflected back after colliding with objects. By calculating the propagation time of the sound waves and their speed, the position and distance of underwater objects can be determined. It is primarily used in fields such as underwater navigation, communication, detection, and underwater terrain surveying.

This solution uses an eight-channel 24-bit 144 kS/s to 400 kS/s synchronous sampling analog-to-digital converter (ADC) GX1278 for signal acquisition in the sonar system. The GX1278 ADC is 100% compatible with TI‘s ADS1278 in both hardware and software, and it employs industry-leading proprietary technology design:

1. Power consumption reduced by 40% compared to TI‘s ADS1278, saving 210mW  

2. Signal-to-noise ratio improved by 3dB, with theoretical detection accuracy enhanced by 0.7 times+  

3. Total harmonic distortion (THD) improved by 8dB, with lower temperature drift

The GX1278 employs a high-order multi-bit Delta-sigma modulator to shape in-band noise, which is then filtered out via an on-chip digital decimation filter, resulting in extremely low in-band noise power. The GX1278 chip offers two on-chip digital filter options: a high-bandwidth FIR filter with an effective bandwidth reaching 90.6% of the Nyquist bandwidth, and in-band ripple less than ±0.005 dB; and a low-latency SINC filter that produces stable data output within six cycles, with superior noise performance.

GX1278 Features:

• 8-channel synchronous sampling with data rates up to 144 kS/s to 400 kS/s

• Selectable high-bandwidth FIR filter and low-latency SINC filter

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

HR mode: 20.8 mW/channel;

LP mode: 10.9 mW/channel;  

LS mode: 2.7 mW/channel;  

• Rail-to-rail input common-mode level  

• Common-mode rejection ratio: 116 dB  

• Analog power supply: 5 V; digital power supply: 1.8 V  

• I/O power supply: 1.8 V to 3.3 V  

• SPI or frame-synchronous interface, supporting daisy-chain mode

• ESD rating: HBM ±2kV, CDM ±2kV; Latch-up ±600mA

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