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ADC3221: 2-Vpp correct? Does this specification refer to the input at the ADC?

Franz Schellhase
Expert 3605 points
Part Number: ADC3221
Other Parts Discussed in Thread: THS4541

Hi team,

Can you have a look at the following customer question and suggest an opamp, please?

For a current project I am currently looking for a measurement technique with 12-ADC and >=25MHz for 2 channels (simultaneous).
A passive anti aliasing filter is planned (calculated with Ri = Ro = 50Ohm).
Draft of the block diagram

One possibility would be the ADC3221.
Analog input voltage range +/-0.5V - so the voltages from above are to be halved.
Or not?
Here is an extract from the datasheet:



Is the specification 2-Vpp correct? Does this specification refer to the input at the ADC?

Which amplifier(s) would you suggest for this application?

Thank you,

Franz

  • 0
    TI__Guru* 91947 points

    Franz,

    Yes, this is across the two input pins. Per the data sheet, differential analog input can be 2Vpp but only if the frequency is below 450MHz. For inputs between 650MHz and 450MHz the max input is 1Vpp.

    The ADC32xxEVM (see attached) has a THS4541 differential amplifier that could possibly be an option. I would suggest checking with the high speed amplifier group for more options.

    Regards,

    Jim

    1464.ADC32XXEVM-SCH_C.pdf