SNAS722A December 2017 – October 2018 LMK61E07
Consider a typical digital subscriber line (DSL) application, in which a local modem must track the clock signal of a network modem to ensure accurate and efficient data transfer. In such systems, a DCXO is implemented to allow a local processor to digitally control the oscillator frequency to maintain synchronization. An example of such a clock frequency would be 70.656 MHz.
The typical schematic above shows the I2C connection to the processor and output configurations for LVPECL AC coupling..
The Detailed Design Procedure below describes the procedure to generate and adjust the required output frequency for the above scenario using LMK61E07.