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RF system-on-chip (RFSoC) devices provide the potential for implementing acomplete radio astronomy receiver on a single board, but performance of theintegrated analogue-to-digital converters is critical. We have evaluated theperformance of the data converters in the Xilinx ZU28DR RFSoC, which are12-bit, 8-fold interleaved converters with a maximum sample speed of 4.096Giga-sample per second (GSPS). We measured the spurious-free dynamic range(SFDR), signal-to-noise and distortion (SINAD), effective number of bits(ENOB), intermodulation distortion (IMD) and cross-talk between adjacentchannels over the bandwidth of 2.048 GHz. We both captured data for off-lineanalysis with floating-point arithmetic, and implemented a real-time integerarithmetic spectrometer on the RFSoC. The performance of the ADCs is sufficientfor radio astronomy applications and close to the vendor specifications in mostof the scenarios. We have carried out spectral integrations of up to 100 s andstability tests over tens of hours and find thermal noise-limited performanceover these timescales.

Characterising the Performance of High-Speed Data Converters for RFSoC-based Radio Astronomy Receivers