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Hi Jainendra,
This schematic looks fine to me. I don't see any issues.
Regards,
Rob
Hi Rob,
Thanks for your feedback.
We have used ADS4149 interfacing with the device part#THS4541RGT. Is it ok?
One more part #OPA857 has been used with the part#THS4541RGT. Is it ok?
Kindly review the schematic.
Regards,
Jainendra
Hi Jainendra,
Not sure the common mode voltage will work between the THS amplifier and ADC. I am forwarding this onto the amplifier team to review.
Regards,
Rob
Hello Jainendra,
ADS4149 requires a pretty low input common-mode voltage of 0.95V. The schematic you shared shows that you are setting the VCM of the THS4541 to 0.95ishV via voltage divider which is correct. However, do take note of decrease in distortion performance and lower I/O headroom due to the deviation from common mode of VS+/2. Please read Section 8.3 in the THS4541 datasheet for more details.
Otherwise, your schematic looks good. At the output of the amplifier, it looks like you are AC coupling, so depending on your input signal, you may instead set VCM to VS+/2 for better performance, and then set output stage post DC-blocking caps to 0.95V (ADC VCM).
Thank you,
Sima