GXSC Analog-to-Digital Converter Replaces AD9689 in Ground Surveillance Radar Systems

Ground surveillance radars primarily enable precise detection, tracking, and identification of vehicles, personnel, and low-altitude targets. With the escalating demands for security and civilian surveillance, these radars are evolving toward wide-area coverage, high-precision detection, robust anti-interference capabilities, and miniaturization. High-performance ADCs are a critical component in system upgrades.

To ensure detection accuracy, stability, and anti-interference capability in ground surveillance radars, engineering designs must prioritize signal capture bandwidth, digitization precision, multi-channel synchronization, and anti-interference performance. Particular attention is required to address challenges such as noise interference, overlapping multi-target signals, and harsh outdoor environments. GXSC‘s dual-channel 14-bit 2.6GSPS high-speed ADC offers advantages including large input bandwidth, high sampling rate, excellent linearity, compact packaging, and low power consumption. It is highly suited to the signal digitization requirements of ground surveillance radars, enabling the construction of a highly reliable and efficient front-end acquisition chain for radar systems.

The GXSC ADC integrates two independent high-performance ADC cores with a multi-stage pipeline architecture and on-chip digital calibration algorithms. Each ADC features a wide input bandwidth and supports various user-selectable input ranges. An integrated reference voltage source simplifies design complexity. Analog inputs and clock signals are differential inputs. The device incorporates an on-chip buffer, enabling direct sampling of analog signals up to 5GHz bandwidth for communication applications.

The GXSC also incorporates several features to simplify automatic gain control (AGC) in communication receivers. A programmable threshold detector enables monitoring of incoming signal power using a fast detection control bit in the ADC register. Beyond the fast detection output, this ADC provides signal monitoring capabilities. The signal monitoring module provides additional information about the signal being digitized by the ADC. Users can configure the JESD204B Subclass 1 high-speed serial output for multiple channel modes—including single-channel, dual-channel, quad-channel, and octal-channel modes—based on data configuration and the acceptable channel data rate of the receiving logic device. The ADC supports multi-device synchronization via the SYSREF+ and SYNCINB± input pins.

GXSC Analog-to-Digital Converter Product Advantages:

- Package size compatible with reference model, supporting functional replacement for AD9689

- Power consumption approximately 60% of reference chip, effectively reducing overall system power consumption

- Wide operating temperature range of -55°C to +105°C with robust performance across the range

 Compact FCBGA196 plastic package reduces system footprint

High integration with built-in digital downconverter and filter lowers system cost

204B high-speed interface simplifies user layout and routing

Full power bandwidth: 6.0GHz

Full power bandwidth: 6GHz (-3dB)

Dynamic performance (fs=2.4GSPS, input signal power -2dBFS)

-fin=155MHz; ENOB=9.42 bits, SFDR=72.94 dBFS, SNR=59 dBFS

-fin=750MHz; ENOB=9.23 bits, SFDR=68.42 dBFS, SNR=57.9 dBFS

-fin=900MHz; ENOB=9.17 bits, SFDR=69.34 dBFS, SNR=57.3 dBFS

-fin=1800MHz; ENOB=8.96 bits, SFDR=66.68 dBFS, SNR=56.3 dBFS

-fin=2100MHz; ENOB=8.74 bits, SFDR=65 dBFS, SNR=55 dBFS

-fin=3300MHz; ENOB=8.3 bits, SFDR=60.2 dBFS, SNR=52.5 dBFS

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