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ADS42LB69EVM: Analogue signal generator as a clock

Spilios Dellis
Prodigy 20 points
Part Number: ADS42LB69EVM

What are the specifications for an analogue signal generator to be used as a clock in the ADS42LB69EVM?

Would the RIGOL DSG815 be a good solution? 

Would it be possible for an arbitrary waveform generator to be used instead of an analogue signal generator?
  • 0
    TI__Mastermind 23760 points

    Hi Spilios,

    The requirement for clock input on this ADC itself is in the datasheet and can be either a single ended or differential sinewave input between 0.3Vpp and 1.6Vpp (differentially). This clock input must be AC coupled. On our EVM, we have the clock input SMA (J3) pass through the balun (T5) to convert to differential signal. The requirements for this input will be approximately (0dBm - 15dBm) or so. We recommend to always use an RF analog signal generator to achieve best performance. Using the Rigol arbitrary waveform generator you list above will not yield best performance of this device as these waveform generators will typically have much worse phase noise/elevated output jitter, which is directly proportional to the maximum attainable SNR of the data converter. The EVM will work if the level is satisfactory but note that the performance will be degraded from the specified values in our datasheet.

    Thanks, Chase

  • 0 in reply to Chase W
    Prodigy 20 points

    Hi Chase,

    the RIGOL DSG815  is an RF signal generator, not an arbitrary waveform generator.

    Thus if I understand correctly any RF signal generator that can provide at least 15dBm will be ok for my application. 

    Thanks, 

    Spilios

  • +1 in reply to Spilios Dellis
    TI__Mastermind 23760 points

    Hi Spilios,

    Understood. I hadn't searched the model number to find that out and assumed it was the AWG. It will certainly work. I'm not sure on the performance of this signal generator (as compared to something such as a Rohde & Schwarz SMA100A) but functionally, it most certainly will suffice for your evaluation.

    Thanks, Chase