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Original question:

ADS8684: Query regarding differential signal measuring using ADC

ADS7066: ADS7066 Reference Buffer

Alexander Doknjas
Prodigy 60 points
Part Number: ADS7066
Other Parts Discussed in Thread: ADS7067, , OPA320, OPA388

Hello,

I am looking for a recommendation for a ADS7066/ADS7067 reference buffer. I see the REF60xx is what is used in the EVM, but I need the ability to aggressively trim the reference voltage via a digipot and buffer combination so the REF60xx integrated buffer is not much benefit. I am looking at using a REF50xx with a OPAx388 or a OPAx365 as they are parts we are already using. If no recommendation can be provided, can the ADS7066/7067 reference current be provided so I can calculate the required parameters for one?

Thanks,


- Alex

  • 0
    TI__Guru 66926 points

    Hi Alex,

    Thank you for your post.

    If you require a discrete buffer in order to trim the reference voltage, then perhaps REF50xx family is the best option. Besides the two amplifiers you listed above, OPA320 is another popular choice for a reference buffer. Noise is slightly higher than the OPA388, but it offers 2x the GBW (20 MHz).

    Regards,

    Ryan