CS2000-CP_09 Datasheet, PDF (3/36 Pages) Cirrus Logic – Fractional-N Clock Synthesizer & Clock Multiplier

CS2000-CP
8.3.3 Auxiliary Output Source Selection (AuxOutSrc[1:0]) ............................................................. 29
8.3.4 Enable Device Configuration Registers 1 (EnDevCfg1) ........................................................ 30
8.4 Device Configuration 2 (Address 04h) ........................................................................................... 30
8.4.1 Lock Clock Ratio (LockClk[1:0]) ............................................................................................ 30
8.4.2 Fractional-N Source for Frequency Synthesizer (FracNSrc) ................................................. 30
8.5 Global Configuration (Address 05h) ............................................................................................... 30
8.5.1 Device Configuration Freeze (Freeze) ................................................................................ 30
8.5.2 Enable Device Configuration Registers 2 (EnDevCfg2) ....................................................... 31
8.6 Ratio 0 - 3 (Address 06h - 15h) ...................................................................................................... 31
8.7 Function Configuration 1 (Address 16h) ........................................................................................ 31
8.7.1 Clock Skip Enable (ClkSkipEn) ............................................................................................. 31
8.7.2 AUX PLL Lock Output Configuration (AuxLockCfg) .............................................................. 32
8.7.3 Reference Clock Input Divider (RefClkDiv[1:0]) .................................................................... 32
8.8 Function Configuration 2 (Address 17h) ........................................................................................ 32
8.8.1 Enable PLL Clock Output on Unlock (ClkOutUnl) ................................................................. 32
8.8.2 Low-Frequency Ratio Configuration (LFRatioCfg) ................................................................ 32
8.9 Function Configuration 3 (Address 1Eh) ........................................................................................ 33
8.9.1 Clock Input Bandwidth (ClkIn_BW[2:0]) ................................................................................ 33
9. CALCULATING THE USER DEFINED RATIO .................................................................................... 34
9.1 High Resolution 12.20 Format ....................................................................................................... 34
9.2 High Multiplication 20.12 Format ................................................................................................... 34
10. PACKAGE DIMENSIONS .................................................................................................................. 35
THERMAL CHARACTERISTICS ......................................................................................................... 35
11. ORDERING INFORMATION .............................................................................................................. 36
12. REFERENCES .................................................................................................................................... 36
13. REVISION HISTORY .......................................................................................................................... 36
LIST OF FIGURES
Figure 1. Typical Connection Diagram ........................................................................................................ 6
Figure 2. CLK_IN Sinusoidal Jitter Tolerance ............................................................................................. 9
Figure 3. CLK_IN Sinusoidal Jitter Transfer ................................................................................................ 9
Figure 4. CLK_IN Random Jitter Rejection and Tolerance ......................................................................... 9
Figure 5. Control Port Timing - I²C Format ................................................................................................ 10
Figure 6. Control Port Timing - SPI Format (Write Only) .......................................................................... 11
Figure 7. Delta-Sigma Fractional-N Frequency Synthesizer ..................................................................... 12
Figure 8. Hybrid Analog-Digital PLL .......................................................................................................... 13
Figure 9. Fractional-N Source Selection Overview ................................................................................... 13
Figure 10. Internal Timing Reference Clock Divider ................................................................................. 14
Figure 11. REF_CLK Frequency vs a Fixed CLK_OUT ............................................................................ 14
Figure 12. External Component Requirements for Crystal Circuit ............................................................ 15
Figure 13. CLK_IN removed for > 2²³ SysClk cycles ................................................................................ 16
Figure 14. CLK_IN removed for < 2²³ SysClk cycles but > t_{CS .................................................................................. 16}
Figure 15. CLK_IN removed for < t_{CS .................................................................................................................................. 17}
Figure 16. Low bandwidth and new clock domain .................................................................................... 18
Figure 17. High bandwidth with CLK_IN domain re-use ........................................................................... 18
Figure 18. Ratio Feature Summary ........................................................................................................... 22
Figure 19. PLL Clock Output Options ....................................................................................................... 23
Figure 20. Auxiliary Output Selection ........................................................................................................ 23
Figure 21. Control Port Timing in SPI Mode ............................................................................................. 25
Figure 22. Control Port Timing, I²C Write .................................................................................................. 26
Figure 23. Control Port Timing, I²C Aborted Write + Read ....................................................................... 26
DS761F1
3