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difference between LTC6946-3 and LTC6948-3


 our company using LTC6946-3 generate 800MHz from 16M source,  LTC6946-3  Will be discontinued soon, these two devices Pins are incompatible i want using LTC6948-3 to replace,  i want to know  Whether i  need to make very big changes code  about  the SPI driver code and Associated registers between these two devices, thanks a lot.