Application of GXSC ADC Replacing ADS8568 in Multi-Axis Motor Coordinated Control System

In high-end equipment such as industrial robots, CNC machining centers, and automated production lines, multi-axis motor coordinated control is a core technology for achieving complex motion trajectories and high-precision positioning. The key to control accuracy lies in the synchronous and precise acquisition of critical parameters such as current, voltage, and position for multi-axis motors. The analog-to-digital converter (ADC) serves as the core component for signal conversion and must simultaneously meet requirements for multi-channel operation, high synchronization, high precision, and anti-interference capability.

The performance characteristics of the eight-channel 16-bit ADC in the GXSC are highly compatible with multi-axis control design, as it specifically addresses the signal acquisition challenges in multi-axis motor control:

Multi-channel synchronous sampling capability: Supports synchronous sampling of 8 channels, enabling simultaneous data acquisition of phase currents and bus voltages for 4 dual-axis motors or 2 triple-axis motors, thereby eliminating phase deviation in multi-axis coordination caused by inter-channel delays.

High Precision and Low Distortion in Performance: With 16-bit resolution, the differential nonlinearity error (DNL) is as low as ±0.5LSB, and the integral nonlinearity error (INL) is only ±1.0LSB. It operates on a single 5V power supply and supports true bipolar input signals with a conversion range of up to +10V, enabling accurate detection of subtle current fluctuations during motor startup or load changes.

High Adaptability and Integration: To simplify the PCB design of data acquisition systems, the ADC incorporates an input buffer with a 1MΩ input impedance and an anti-aliasing filter for direct analog signal acquisition. It also features a flexibly configurable high-precision reference voltage generator and buffer. The chip supports both parallel and serial modes, which can be configured via different hardware pin connection schemes, creating multiple interface conditions for connecting the device to microprocessors or DSPs.

GXSC ADC Product Advantages:

ENOB: 14.6 bits (typical)

SNR: 90dB (typical value)

SINAD: 89.5 dB (typical value)

SFDR: -105dB (typical value)

INL: ±1LSB (typical)

DNL: ±0.5LSB (typical)

Operating power consumption: 350mW (internal reference)

Operating temperature: -55°C to +125°C

Product dimensions, pins, functions, and timing-compatible alternative to ADS8568

Single 5V power supply, compatible with ±15V power pins, for easy application

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

Higher channel isolation