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ADS52J90: Response Above 70MHz

Richard Elmquist
Mastermind 45250 points

Part Number: ADS52J90

I have a customer who purchased the ADS52J90EVM and realized that the device is not really meant to operate in his frequency range. Here are his questions:

It says in the datasheet that performance will be degraded above 70 MHz. Can you please provide me with a characterization plot for the signal above 70 MHz? (I am not too worried about the SNR, as I can deal with drops in the SNR). I am more interested in the attenuation of the signal, and the shape of the low pass filter above 70 MHz.

Can you provide the information for the customer?

Thanks for your help with this!

Richard Elmquist

  • 0
    TI__Expert 4145 points

    Hi Richard,

    I am not sure whether this question comes from the same customer as this thread but as I stated there, we have no characterization data for the ADS52J90 showing performance above 70MHz since the device wasn't designed for frequencies higher than 70MHz. What is the customer's application?

    I took some measurements in the lab for 16channel 10b mode, sampling frequency of 100MSPS with the following results;

    • fundamental frequency signal strength at -10.44dBFS for a 5MHz signal.
    • fundamental frequency signal strength at -11.37dBFS for a 70MHz signal. 
    • fundamental frequency signal strength at -12.64dBFS for a 105MHz signal. 
    • fundamental frequency signal strength at -13.94dBFS for a 140MHz signal. 
    • fundamental frequency signal strength at -13.28dBFS for a 180MHz signal. 
    • fundamental frequency signal strength at -15.39dBFS for a 205MHz signal. 

    Note we can't guarantee this performance for all ADS52J90s as they are not characterized for an input frequency above 70MHz.

    Sincerely,

    Olu