Suitable Driver for AD9681 ADC, ADL5566 or AD8351 or else?

Dear engineers!

I am looking for a suitable driver for the AD9681 8-channel 14bit ADC. Currently we are working with the ADL5566 and an ADC of a different vendor. We would like to replace our current ADC with the AD9681 due to its lower power consumption. I am therefore asking for your advise for an ADC driver (that also does single-ended to differential conversion).

Do you have any experience with interfacing the ADL5566 with the AD9681?

Our signals are gain scaled and bandpass filtered in front of the ADC driver and are AC coupled only. Between driver and ADC we only would like to have a simple AA-LPF (400MHz). The signals are of <5MHz BW with a center frequency in the range of 100..350MHz and undersampled (downconversion is done digitally in the FPGA).

The big advantage of the ADL5566 is its linearity (when compared to the AD8351) and the fact that it houses two diffamps (space), however, it uses slightly more power. We would run it on 3.3V (or slightly more).

Thank you for your input!

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  • Hi bsam.

    thanks a lot.

    I would like to use the ADL5566 to drive the AD9681 and do SE-Diff conversion. In front of the ADL5566 i have a single ended (SE) bandpass (switched) and I need a max of 60dB gain - of which I would like to have at least some 30dB programmable. Do you recommend some good single ended parts by Analog or this?

    I was considering the SPF-5122Z as gain block and first stage amp and am looking for some linear, low power DGAs to put after that. I have used the AD8368 before but this one does not meet the specs in terms of linearity (plus it is analog controlled - digital is desired.

    Or would it be advisable to change the topology to e.g.:

    SE in -> SPF-5122Z -> AD8376 -> diff ->  ADL5202 -> BPF -> ADL5566 -> LPF-> AD9681

    Thank you

Reply
  • Hi bsam.

    thanks a lot.

    I would like to use the ADL5566 to drive the AD9681 and do SE-Diff conversion. In front of the ADL5566 i have a single ended (SE) bandpass (switched) and I need a max of 60dB gain - of which I would like to have at least some 30dB programmable. Do you recommend some good single ended parts by Analog or this?

    I was considering the SPF-5122Z as gain block and first stage amp and am looking for some linear, low power DGAs to put after that. I have used the AD8368 before but this one does not meet the specs in terms of linearity (plus it is analog controlled - digital is desired.

    Or would it be advisable to change the topology to e.g.:

    SE in -> SPF-5122Z -> AD8376 -> diff ->  ADL5202 -> BPF -> ADL5566 -> LPF-> AD9681

    Thank you

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