What is the maximum sample rate for the MAX2769C's ADC?
According to the MAX2769C's datasheet (page 16), it is stated that the ADC's maximum sampling rate is approximately 50Msps.
While it is true that the ADC hardware can operate at 50Msps, the clock supplied to the ADC is limited to 32MHz for the MAX2769C. There are internal limitations that prevent the clock from exceeding 32 MHz. Therefore, the MAX2769C has a maximum sample rate of 32Msps.
The MAX2771 uses the same ADC hardware and is capable of sampling at approximately 50Msps as long as the 50MHz clock is provided externally.