The four-channel 12-bit 50kSPS synchronous sampling analog-to-digital converter GX7874 replaces AD7874 for application in sonar systems

The sonar system utilizes the propagation characteristics of sound waves underwater, employing electroacoustic conversion and signal processing to accomplish tasks such as underwater detection, positioning, and communication. When sound waves propagate underwater and encounter a target object, they reflect back and are captured by the sonar‘s receiving device. These received acoustic signals are first converted into analog electrical signals, and the analog-to-digital converter is responsible for acquiring these analog signals.

In sonar systems, accurate analog-to-digital conversion is crucial. The GXSC data acquisition system, the GX7874, is pin-to-pin compatible with the AD7874 and can be applied in sonar systems. Its 12-bit precision meets the signal acquisition requirements of sonar systems. The GX7874 features a built-in 12-bit ADC, on-chip reference voltage source, on-chip clock, and four sample-and-hold amplifiers. The on-chip reference provides a stable voltage for the device, while the ADC offers an accurate timing reference, ensuring coordinated operation among various functional modules. Additionally, it allows simultaneous sampling of four input channels while maintaining a consistent phase relationship among them.

The four sample-and-hold amplifiers of the GX7874 feature minimal aperture delay with minimum and maximum limits, enabling multiple chips to simultaneously sample multiple input channels without causing phase errors between signals connected to multiple devices. The reference voltage output/input feature also allows multiple chips to be driven by the same reference voltage source. The GX7874 includes standard digital interfaces, facilitating connections between the device and microprocessors or DSPs.

Product Advantages of GX7874:

Single 5V power supply, compatible with ±5V power pins, for easy application

Product dimensions, pinout, and functional compatibility with the AD7874

Supports conversion of true bipolar input signals with ±10V range

Better signal-to-noise ratio, higher linearity

Lower bipolar output error, lower positive and negative full-scale error

Higher channel isolation

ENOB: 11.8 Bits (Typical Value)

SINAD: 73.4dB (typical value)

SFDR: 95dB (typical)

INL: ±0.1LSB (typical)

DNL: +0.1LSB (typical)

Operating power consumption: 70mW (typical value)