Fiber-optic gyroscopes can utilize the GXSC ADC and DAC as replacements for the AD9245 and AD9764.

A fiber-optic gyroscope is a high-precision inertial sensor capable of accurately determining the orientation of a moving object. Compared to traditional gyroscopes, it offers advantages such as an all-solid-state structure, light weight, strong resistance to interference, and radiation resistance. The operating principle involves detecting the phase difference between two beams of light traveling in opposite directions to calculate the angular velocity of the carrier, thereby achieving precise attitude and heading positioning.

The measurement accuracy of a fiber-optic gyroscope depends on the precision of signal acquisition, processing, and feedback control. Among these, the analog-to-digital converter (ADC) and digital-to-analog converter (DAC) serve as the interfaces for converting analog signals to digital signals and are the key components determining system performance. This gyroscope solution utilizes GXSC’s 14-bit 80 MSPS ADC and 14-bit 125 MSPS DAC to build an efficient and stable signal conversion chain, effectively addressing the issues of low accuracy, high noise, and slow response times associated with traditional conversion devices in fiber optic gyroscope applications.

Manufactured using CMOS technology, this GXSC ADC features a wide bandwidth, excellent dynamic performance, and low power consumption. It perfectly balances the performance, cost, and integration requirements of SDR systems, making it the preferred digital solution for mid-to-high-end SDR systems. Incorporating a high-performance sample-and-hold amplifier and a voltage reference, the device utilizes a differential, multi-stage pipelined architecture with output error correction logic to provide 14-bit precision and ensure no lost counts across the full temperature range. The wideband, fully differential SHA allows for multiple selectable input ranges and a wide input common-mode range, including single-ended applications.

This GXSC DAC features a segmented current-source architecture, which not only reduces stray components but also enhances dynamic performance. It integrates an edge-triggered input latch and a 1.25V temperature-compensated bandgap reference to provide a complete monolithic digital-to-analog conversion solution. The differential current output supports both single-ended and differential applications; in differential output mode, the matching between the two current outputs affects dynamic performance. The current outputs can be connected directly to output resistors to provide two complementary single-ended voltage outputs, or they can be connected directly to a transformer.

Simplified circuit design and reduced R&D costs: Both the GXSC ADC and DAC feature high integration and flexible interface designs, enabling direct interfacing with digital processing chips such as DSPs and FPGAs without the need for additional complex conversion circuits. This simplifies the circuit design process for fiber-optic gyroscopes and shortens the R&D cycle. At the same time, the devices’ high reliability reduces system failure rates and lowers operational and maintenance costs, making them particularly well-suited for low-cost RFOG design requirements.