Replacement of AD7609 with GXSC Analog-to-Digital Converter in Power Line Protection Systems

The power line protection system serves as the first line of defense for grid safety, requiring real-time monitoring of critical electrical parameters such as voltage, current, and power. In the event of a fault, it must accurately determine the type and location of the fault, swiftly initiate protective actions like tripping and current limiting, and minimize the impact of the fault. This process demands high precision in signal acquisition, multi-channel synchronization, and high reliability. The GXSC‘s 8-channel 18-bit analog-to-digital converter is specifically designed for multi-channel high-precision signal acquisition, perfectly meeting the core requirements of power line protection systems for synchronous collection of multiple parameters such as "three-phase voltage, three-phase current, and zero-sequence components.".

The GXSC analog-to-digital converter integrates eight 18-bit fast, low-power successive approximation register (SAR) ADCs. Each channel of this ADC achieves a conversion rate of up to 200 kSPS and operates on a single 5V power supply, enabling the conversion of true bipolar differential input signals ranging from ±20V to +10V. It supports both parallel and serial modes, configurable via different hardware pin connection schemes, which provides multiple interface options for connecting the device to FPGAs, microprocessors, or DSPs.

To simplify the PCB design of the data acquisition system, the GXSC analog-to-digital converter incorporates an input buffer with 1MΩ input impedance and an anti-aliasing filter for direct analog signal acquisition. Additionally, it integrates a flexibly configurable high-precision reference voltage generator and buffer.

Advantages of GXSC Analog-to-Digital Converter Products:

Product dimensions, pins, functions, and timing are compatible with the reference product, supporting Pin-to-Pin drop-in replacement for the AD7609

Single 5V power supply, true bipolar differential analog input

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

Higher channel isolation

ENOB: 14.9 Bits (Typical)

SNR: 91.8 dB (typical value)

SINAD: 91.5dB (Typical Value)

SFDR: -110dB (typical)

INL: ±2.5LSB (typical)

DNL: ±0.75 LSB (typical value)

Operating power consumption: 120mW (internal reference)

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

64-pin LQFP package