looking for below A/D:
Look at the ADS4249. It runs up to 250 MSPS, has 14-bit resolution, and > 70 dB SNR. In CMOS mode running at 200 MSPS, the power should be 400 mW total (200 mW per channel). If you use a lower sampling rate then the power will be lower. There are plots in the datasheet to show the power vs sampling rate. There are also 12-bit and slower versions of the part available (ADS422x and ADS424x series parts).
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