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ADS7865: Minimum Clock Frequency

Part Number: ADS7865

Hi,

The datasheet for the ADS7865 specify a minimum fCLK of 1MHz. Is this just due to the sample and hold stage (self discharge of Cs) or is the converter not functional at all with a lower fCLK?

The reason for this question is that I need to check if I can control the ADS7865 over boundary scan. The fastest clock I can generate is in the range of 58kHz.

Best regards,

Patrick

  • Hi Patrick,

    Thank you for your post. 

    I imagine the ADS7865 is still functional at lower clock speeds, but I'm not sure what are the consequences for using a CLK frequency below 1 MHz. This would simply lead to a longer conversion time, for which there is no maximum.

    This minimum clock frequency also creates a minimum specified data rate. It may be that we simply chose not to characterize the performance of the device below this data rate if it was not an expected use case.

    Regards,

  • Hi Ryan,

    Thanks for the answer.

    First attempts show that a fCLK of approx 58kHz does the job as well. But I can't tell anything about the precision yet.

    Regards,

    Patrick