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ADS7953: 7pcs ADS7953 share one Ref?

Jimmy WANG
Genius 4085 points
Part Number: ADS7953

Tool/software:

Hi team,

The customer uses 7 ADS7953s. Can only one reference voltage IC be used to supply 7 devices?

  • 0
    TI__Genius 15160 points

    Hi Jimmy,

    It definitely can, but that also depends on the maximum supply current of the reference as well. Given that the max current consumption of the ADS7953 is 3mA, I would recommend a reference voltage that can supply higher than 25mA of current.

    An LDO with higher current sourcing capabilities is also okay to supply the +VA and VBD supplies. The reference voltage can be used to drive the REF pins, since this is what the devices uses as the ADC reference.

    Regards,
    Joel

  • 0 in reply to Joel Meraz
    Genius 4085 points

    Hi Joel,

    you mean +VA need 3mA  right? If only REFM of p31. need 3mA? 

  • 0 in reply to Jimmy WANG
    TI__Genius 15160 points

    Hi Jimmy,

    Apologies, I was unclear on whether the supply was for the analog supply or for the REFx reference voltage input. Generally, a reference voltage IC should be able to drive the reference voltage inputs of 7x ADS7953s, as the current required once local decoupling capacitors are charged is minimal.

    Regards,
    Joel