@Mr_Vancouver I’d respectfully call a time-out here; your text and your schematic snippet makes it appear to me as if you’re intending to simply hook a 20 MHz crystal up to the SCLK input of an ADS7952. If that indeed was your intent, it suggests a fundamental misunderstanding of the character of the ADC’s serial interface.
Any crystal or other frequency source in your system would not normally connect to an ADS7952 directly, but rather to the microcontroller, FPGA, or similar “intelligent” device having a serial interface peripheral which subsequently drives the SCLK pin in coordination with the SDI, SDO, and CS pins in order to transfer data and do something with it.
Questions of load capacitance and whatnot are all very pertinent and briefly discussed here, but are at best a topic of secondary importance to the issue of getting the lines drawn correctly in the block diagram of one’s system.