The USRP has a 64 MHz clock onboard which gives a 64 MS/s ADC and 128 MS/s DAC. To change that, you can use the external clock mode, or you can replace the clock with another one. The pin-compatible family is from CTS and contains many different frequencies. The 64 MHz clock is part number CTX286LVCT-ND from Digikey. Make sure you get an LVCT version.
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