I need to synchronize the McBSPs with a signal generator, so I'd like to use the 10 MHz reference output of the signal generator as an external clock. I want to connect the reference output to the CLKR0 pin of the DSP, but I'm worried about improper impedance matching and reflections generating voltages outside the safe range of this pin. I'm using a Spectrum Digital development board which has a 33.1 ohm resistor in series with the CLKR0 pin. I'm planning on using a CDCLVC1102 clock buffer, so the setup I'm thinking of is:
Signal Generator 10 MHz reference clock (50 ohm) --> long BNC cable (50 ohm) --> CDCLVC1102 (~50 ohm output) --> short wire --> 33.1 ohm resistor --> CLKR0 pin
I want to mount the clock buffer chip as close to the 33.1 ohm resistor on the development board as possible and minimize the length of the connecting wire. I didn't see impedance information in the TMS320VC5509A data sheet, so is it safe to assume CLKR0 is 50 ohms? Do you think a 50 ohm output from the clock buffer, to a short wire, to the 33.1 ohm resistor, to the pin is a good enough match to minimize reflections?
