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CDCE72010RGCT Datasheet(PDF) 58 Page - Texas Instruments |
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CDCE72010RGCT Datasheet(HTML) 58 Page - Texas Instruments |
58 / 70 page EXTERNAL/HOLD FUNCTION INTERNAL/HOLD FUNCTION 3-State ChargePump yes yes no PLL Out-of-Lock PLL-Lock OutputSet no 64PFD LockCycles Ref.Clock isBack no no Start PLL isout- of-lockifthephase differenceof ReferenceClock and FeedbackClock atPFDareoutsidethe predefinedLock-Detect-Windoworifa Cycle- Slipoccurs. FrequencyHold-OverFunctionworksin combinationwiththe AnalogLock -Detect Charge- Pumpisswitchedinto 3-State. PLL hastobeinLOCKtostart HOLD-Function. ( The AnalogLockoutputisnotresetbythefirstOut-of- Lockevent. Itstays ‘High’ dependingontheanalogtime delay ( outputC-load). Thetimedelaymustbelongenough toguaranteeproperHOLDfunction) TheCharge-Pumpremainsinto 3-State untilthe ReferenceClock isback. The 1 st valid ReferenceClock atthePFDreleases theCharge- Pump. ThePLL acquire 64 lockcyclestophase aligntotheinputclock. CDCE72010 SCAS858 – JUNE 2008...................................................................................................................................................................................................... www.ti.com The Charge Pump can directly be switched into 3-State. This function is also available via SPI register. If logic low is applied to HOLD pin the Charge Pump will be switched to 3-State. After HOLD pin is released, the charge pump is switched back in to normal operation, with the next valid reference clock cycle at PRI_REF or SEC_REF and the next valid feedback clock cycle at the PFD. During HOLD, all divider and all outputs are at normal operation. In Internal HOLD Function or HOLD-Over-Function the PLL has to be in lock to start the HOLD function. It switches the Charge Pump in to 3-State when an ‘out-of-lock’ event occurs. It leaves the ‘3-State Charge Pump’ state when the Reference Clock is back. Then it starts a locking sequence of 64 cycles before it goes back to the beginning of the HOLD-Over loop. Figure 24. Frequency Hold Over 58 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): CDCE72010 |
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