SNAA345 December   2020 LMK5C33216

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Wander Generation
    1. 2.1 Wander Generation MTIE Option 1, G.8262 EEC Option 1
    2. 2.2 Wander Generation TDEV G.8262 EEC Option 1
    3. 2.3 Wander Generation MTIE Stratum ITU-T G.8262 EEC Option 2
    4. 2.4 Wander Generation TDEV G.8262 EEC Option 2
  4. 3 Wander Transfer
    1. 3.1 Transfer Function of the PLL for Option 1 and Option 2
    2. 3.2 Wander Transfer TDEV G.8262 Option 2
  5. 4 Wander Tolerance
    1. 4.1 Wander Tolerance G.8262 Option 1
    2. 4.2 Wander Tolerance G.8262 Option 2
  6. 5 Jitter Tolerance
    1. 5.1 Jitter Tolerance G.8262 Option 1 and Option 2
  7. 6 Phase Transient Generation
    1. 6.1 Short-Term Phase Transient Response G.8262 Option 1
    2. 6.2 Short-Term Phase Transient Response G.8262 Option 2
    3. 6.3 Phase Transient Generation With Signal Interruptions G.8262 EEC Option 1
    4. 6.4 Phase Discontinuity G.8262 Option 1
    5. 6.5 Phase Discontinuity G.8262 Option 2
  8. 7 Holdover
    1. 7.1 Holdover G.8262 Option 1
    2. 7.2 Holdover G.8262 Option 2
  9. 8 Free-Run Accuracy
    1. 8.1 Free-Run Accuracy G.8262 Option 1 and Option 2
  10. 9 Pull-In and Hold-In
    1. 9.1 Pull-In Range G.8262 Option 1 and Option 2
  11. 10Conclusion
  12. 11References

3.1 Transfer Function of the PLL for Option 1 and Option 2

Wander transfer is determined by the DPLL loop BW and peaking. For Option 1, the DPLL loop bandwidth was set to 10 Hz and for Option 2, the DPLL loop bandwidth was set to 0.1 Hz. Both Option 1 and Option 2 require < 0.2 dB of peaking. The LMK5C33216 meets the requirements for the transfer function of the PLL for EEC Option 1 and Option 2 as shown in Figure 3-2 and Figure 3-3. The results show a close match between expected bandwidth and measured bandwidth on LMK5C33216. For Option 1, the expected bandwidth is 10 Hz and the measured bandwidth is around 10 Hz. For Option 2, the expected bandwidth is 0.1 Hz and the measured bandwidth is around 0.1 Hz.

GUID-20201210-CA0I-LN17-2H9V-QQ6W3WR6KWCQ-low.svgFigure 3-2 Wander Transfer EEC Option 1 With Max DPLL Bandwidth of 10 Hz
GUID-20201218-CA0I-15D9-5MHB-1NGWV8FTLH5F-low.svgFigure 3-3 Wander Transfer EEC Option 2 With Max DPLL Bandwidth of 0.1 Hz