GXSC Analog-to-Digital Converter Replaces AD7864 in Servo Control Systems

Servo drives serve as critical control components in industrial automation and smart manufacturing, ensuring stable operation in scenarios such as machine tool processing, robotic maintenance, and automated production lines. Within servo control systems, the acquisition and conversion of current feedback signals and voltage feedback signals play a vital role in enhancing system control performance, demanding high sampling accuracy and stability. GXSC‘s four-channel 12-bit 500kSPS analog-to-digital converter fully meets these requirements.

Servo drives require synchronous acquisition of three-phase stator currents and position feedback signals from encoders. Single-channel or asynchronous sampling approaches are prone to signal timing misalignment, causing closed-loop control lag. The GXSC ADC features four independent analog input channels supporting synchronous quad-channel sampling. This enables simultaneous acquisition and conversion of multiple signals, ensuring temporal consistency for critical parameters like current and position. This approach eliminates issues such as speed fluctuations and positional offset caused by sampling errors at the source.

The GXSC demonstrates superior performance in high-speed, high-precision data acquisition applications. It employs a high-speed successive approximation register (SAR) architecture, integrating four 12-bit fast, low-power ADCs. Each ADC channel achieves a conversion rate of up to 500kSPS. The chip utilizes both the input signal and an internal oscillator to control the conversion process and data acquisition. Powered solely by a 5V supply, it supports true bipolar input signals of +10V and +5V.

The GXSC ADC features one high-speed parallel interface and one high-speed serial interface, enabling seamless connection to microprocessors or DSPs. Packaged in a plastic LQFP44, it is compatible with the imported ADI AD7864. Key product features include:

 Single 5V power supply for convenient application

Product dimensions, pinout, and functionality are compatible with reference product AD7864

Improved signal-to-noise ratio and higher linearity

Lower bipolar zero-level error and reduced positive/negative full-scale error

Enhanced channel isolation

ENOB: 11.9 bits (typical)

SINAD: 73.4 dB (typical)

 SFDR: 92 dB (typical)

INL: ±0.1 LSB (typical)

DNL: ±0.1 LSB (typical)

Operating power consumption: 100 mW (typical)