The LMK5B33216 integrates a VCBO into APLL3 (the BAW APLL) to achieve ultra-low phase noise and jitter. The VCBO is a high-Q BAW resonator that is co-packaged with the LMK5B33216 silicon IC and divided down to generate low-jitter Ethernet clocks.

Figure 2-3 shows the composition of the BAW resonator technology. The structure includes a thin layer of piezoelectric film between two metal films and other layers that confine the mechanical energy. The BAW utilizes this piezoelectric transduction to generate a vibration, therefore, outputting a clock frequency. For more information on the BAW, refer to our list of BAW Application Notes.

Figure 2-3 Basic Structure of a Bulk Acoustic Wave Resonator

BAW technology greatly reduces the phase noise and RMS jitter of the synchronized output clock, thereby meeting and exceeding the challenging system requirements for 400 Gbps and 800 Gbps systems by a comfortable margin.