External MHz Oscillator for RF Reference Frequency | Cypress Semiconductor
External MHz Oscillator for RF Reference Frequency
I am finding myself in a position where I am needing 3 different crystals in my application. Two for the PSoC (RTC and MHz crystal for CAN) and one for a 915 MHz ZigBee transceiver. What I would like to do is instead have the two on the PSoC and then output a clock signal to the transceiver. My question is, assuming I can route the clock trace on the board to not pick up a lot of noise, how much noise would I be adding to the clock signal by routing it out a GPIO pin from the MHz ECO (16MHz crystal). I wouldn't be routing through the PLL. Just straight from the ECO to the GPIO. Obviously the phase noise, jitter, etc. needs to be pretty small for the RF reference frequency, but I haven't found any specs for the ECO. Anyone have any thoughts?