Application of the GXSC ADC as a Replacement for the LTC2255 in Microwave Backhaul Links

In recent years, with the rapid advancement of wireless communication technologies, microwave backhaul links have played a crucial role in providing high-bandwidth, low-latency data transmission, particularly in areas where fiber optic deployment is impractical or cost-inefficient. Currently, microwave backhaul solutions have evolved from traditional point-to-point connections to complex systems that include multipoint access and adaptive modulation, capable of dynamically adjusting spectrum utilization to optimize performance.

Microwave backhaul links primarily enable long-distance, highly reliable transmission of broadband data. Their technical requirements revolve around five key dimensions: signal transmission quality, bandwidth capacity, latency control, environmental adaptability, and system integration. GXSC’s 14-bit 125 Msps single-channel ADC is specifically designed for the digitization of high-frequency, wide dynamic range signals. Its core features align closely with the technical requirements of microwave backhaul links. Compared to traditional ADC solutions, it offers significant advantages in terms of accuracy, power consumption, and integration, effectively addressing the core challenges of signal digitization in microwave backhaul links.

The GXSC ADC offers selectable rates of 125 Msps or 105 Msps and operates at a low power consumption of just 3V. Designed specifically for the digitization of high-frequency, wide dynamic range signals, it is also well-suited for demanding imaging and communication applications. Its AC performance includes a 72.3 dB SNR and an 85 dB spurious-free dynamic range (SFDR) for signals at the Nyquist frequency. DC specifications include ±1 LSB INL (typical) and ±0.5 LSB DNL (typical) across the entire temperature range, with no lost codes. Its conversion noise is very low, at only 1.3 LSB RMS.

The GXSC ADC features the following:

 Performance comparable to the LTC2255, enabling seamless replacement

 Unique ESD protection circuit design, with measured ESD (HBM) >7000V (rated at 4000V)

 14-bit, 125 Msps, single-channel, low-power A/D converter

 Designed for digitizing high-frequency, wide dynamic range signals

 3V (2.85–3.4V) single-supply operation

Low power consumption: 280mW

No lost codes

Flexible input range: 1Vp-p to 2Vp-p

640MHz full-power bandwidth sampling and holding

Integrated clock duty cycle stabilizer

Supports shutdown and sleep modes