GXSC Analog-to-Digital Converter Replaces AD9268 for Base Station RF Signal Digitization

RF signal digitization is a critical component in modern communication base stations, determining the base station‘s signal demodulation accuracy, multi-mode compatibility, interference suppression capability, and network coverage quality. With the widespread adoption of 5G technology and the large-scale deployment of multi-mode base stations, base stations must process multi-band signals including GSM, EDGE, W-CDMA, LTE, and 5G NR. This necessitates analog-to-digital converters with high-speed sampling, high-precision conversion, and low-power consumption characteristics.

GXSC‘s four-channel 14-bit 125MHz ADC features high sampling rates, high signal-to-noise ratio, intermediate frequency sampling capability, and a compact package design. It is ideally suited for base station RF signal digitization requirements and serves as the preferred component for applications including multi-mode base stations, smart antenna systems, and software-defined radio. Each channel‘s ADC core employs a multi-stage, differential pipeline architecture and integrates output error correction logic. Each ADC incorporates a wide-bandwidth, differential sampling-and-hold analog input amplifier supporting user-selectable input ranges. Key product advantages include:

- Package size and functional compatibility with AD9268

- Low power consumption, no heat sink required

- Selectable on-chip jitter

- Programmable internal ADC reference voltage source

- Single 1.8 V supply operation

 Flexible analog input range: 1Vpp to 2VpP

Flexible power-down modes

The GXSC ADC outputs data directly to two external 16-bit output ports configurable as 1.8V CMOS or LVDS. Flexible power-down options significantly reduce power consumption when needed. Configuration and control utilize a three-wire SPI-compatible serial interface. To accommodate diverse application requirements and scenarios, this ADC offers a product family with selectable speed grades of 60MSPS, 80MSPS, 105MSPS, and 125MSPS, enabling flexible power management. Speed grades are identified via dedicated registers. Key features include:

• Integrated dual-channel 125MSPS ADC

• Low power consumption, no heat sink required

• Optional on-chip jitter

• Programmable internal ADC reference voltage source

• Integrated ADC sample-and-hold input

• Single 1.8V power supply

• 1.8V CMOS/LVDS output

• Flexible analog input range: 1Vpp to 2Vpp

• Serial port control

• Flexible power-saving shutdown modes