GXSC Dual-Channel 14-Bit 250 MSPS Analog-to-Digital Converter Replaces AD9643 in Multi-Mode Digital Receivers

The primary function of a multi-mode digital receiver is to support multiple communication standards, enabling the precise reception, sampling, and digital processing of signals across different frequency bands and modulation formats, such as WCDMA, TD-SCDMA, LTE, WiMAX, GSM/EDGE, and others. They must efficiently receive and digitally process signals across different frequency bands and modulation formats in complex electromagnetic environments. For the signal acquisition stage, a high-performance analog-to-digital converter is required to meet the application demands of multi-mode digital receivers.

This solution recommends the GXSC dual-channel 14-bit 250 MSPS analog-to-digital converter, which delivers outstanding performance in signal processing. At an input frequency of 185 MHz and a sampling rate of 250 MSPS, it achieves a signal-to-noise ratio (SNR) of 70.6 dBFS and a spurious-free dynamic range (SFDR) of 85 dBc. Furthermore, under conditions of 185 MHz, −1 dBFS (AIN), and 250 MSPS, the input noise is as low as −151.6 dBFS/Hz. These performance metrics effectively reduce signal distortion and noise interference, providing cleaner and more accurate signals for data processing.

Rich feature set: An integrated ADC voltage reference simplifies the design process and reduces the need for external components. It also features a flexible analog input range (1.4 Vp-p to 2.0 Vp-p, 1.75 Vp-p nominal) to accommodate the input requirements of various signal sources. Furthermore, the ADC clock duty cycle stabilizer compensates for variations in the clock duty cycle, ensuring the converter consistently maintains excellent performance.

Low-Power Design: Power consumption is only 785 mW at a sampling rate of 250 MSPS. The chip also offers flexible power-saving and power-down modes, allowing power consumption to be reduced according to the needs of the specific application, thereby extending device battery life or reducing thermal requirements.

Flexible Power Supply and Output: The 1.8V supply voltage reduces system power supply complexity and power consumption. The output uses an LVDS (ANSI-644 level) interface, offering advantages such as high speed, low power consumption, and strong immunity to interference, enabling efficient connectivity with various digital systems.