What crystals are used in the different XO and VCXO product families?
There are currently 3 different crystals used in Silicon Labs' XO and VCXO product families as listed below: 1. 114.285 MHz 3rd overtone mode - Si53x/55x/57x 2. 39.17 MHz fundamental mode - Si59x 3. 31.98 MHz fundamental mode - Si51x These are all AT-cut crystals intended to operate over -40C to +85C ambient temperature. The crystal selection for a particular device family is based on a cost versus performance trade-off.