GXSC ADC Replaces AD9694 in Ultra-Wideband Satellite Receivers

Broadband satellite receivers serve as the signal exchange hub between the ground and satellites, performing the reception, acquisition, quantization, and preprocessing of wide-band satellite signals. The operational chain consists of antenna reception—RF conditioning—analog-to-digital conversion—digital signal processing—data output. Among these stages, the analog-to-digital conversion stage acts as the pivotal link between analog satellite signals and the digital processing system, determining the accuracy of downstream signal demodulation and decoding as well as the overall communication quality of the system.

 

The GXSC four-channel 14-bit 500 MSPS ADC, with its wide input bandwidth, excellent linearity, and low power consumption, is ideally suited for the signal acquisition requirements of ultra-wideband satellite receivers. It eliminates the need for complex front-end conditioning and signal preprocessing circuits, significantly simplifying the hardware architecture of ultra-wideband satellite receivers while ensuring the integrity and purity of satellite signals.

 

As satellite communication technology evolves toward higher bandwidths, faster data rates, and multi-constellation coordination, the signal acquisition requirements for ultra-wideband satellite receivers will continue to increase. The GXSC ADC features four-channel synchronous acquisition capability, with each channel independently configurable and supporting a flexible differential input range (1.44 V p-p to 2.16 V p-p), perfectly meeting the multi-channel, multi-band acquisition needs of ultra-wideband satellite receivers. The chip features on-chip buffers and a sample-and-hold circuit designed for low power consumption, compact size, and ease of use. With a -3dB input bandwidth of 1.4 GHz and power consumption approximately 53% that of reference chips, it effectively reduces the overall power consumption of system solutions, offering advantages such as high sampling rates, excellent linearity, a small package size, and low power consumption.

 

The GXSC ADC core employs a multi-stage differential pipeline architecture and integrates output error correction logic. Each ADC features a wide-bandwidth input and supports various user-selectable input ranges, with both analog inputs and clock signals provided as differential inputs. The data output of this domestically produced ADC is connected to four digital downconverters (DDCs) via an internal multiplexer. Each DDC consists of multiple cascaded signal processing stages, including a 48-bit frequency converter (digital controlled oscillator) and up to four half-band decimation filters. Switching between DDC modes can be controlled via SPI programming.

 

GXSC ADC Product Advantages:

1. GXSC ADC package dimensions are compatible with the reference model, supporting in-place replacement of the AD9694

2. Power consumption is approximately 53% of the reference chip, effectively reducing the overall power consumption of the system solution

3. Wider operating temperature range of -55°C to +125°C, providing better environmental adaptability

4. Small package size, effectively reducing system volume

5. High integration, incorporating digital down-conversion and filters, which helps reduce system costs

6. 204B high-speed interface, facilitating user layout and routing