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CDCE62005 Datasheet(PDF) 47 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 47 Page - Texas Instruments |
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47 / 85 page  PFD/ CP FromInputDivider FromFeedback Divider ToLoopFilter FromInputDivider FromFeedback Divider Locked Unlocked FromInputDivider FromFeedback Divider 25 24 23 22 Register 5 Lock Detect Window (Max) Lock Detect Window Adjust (a) (b) 27 26 FromDigital Lock Detector PLL_LOCK 1 = Locked O = Unlocked (c) CDCE62005 www.ti.com SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 Table 33. CDCE62005 Internal Loop Filter – R3 Settings R3 SETTINGS BIT NAME → LFRCSEL20 LFRCSEL19 RESISTOR VALUE → 10 k 5 k REGISTER.BIT → 7.20 7.19 RESISTOR VALUE (k Ω) 0 0 20 0 1 15 1 0 10 1 1 5 8.3.5.20 External Loop Filter Component Configuration To implement an external loop filter, set EXLFSEL bit (6.26) high. Setting all of the control switches low that control capacitors C1 and C2 (see Table 29 and Table 30) remove them from the loop filter circuit. This is necessary for an external loop filter implementation. 8.3.6 Digital Lock Detect The CDCE62005 provides both an analog and a digital lock detect circuit. With respect to lock detect, two signals whose phase difference is less than a prescribed amount are ‘locked’ otherwise they are ‘unlocked’. The phase frequency detector / charge pump compares the clock provided by the input divider and the feedback divider; using the input divider as the phase reference. The digital lock detect circuit implements a programmable lock detect window. Table 34 shows an overview of how to configure the digital lock detect feature. When selecting the digital PLL lock option, the PLL_LOCK pin will possibly jitter several times between lock and out of lock until the PLL achieves a stable lock. If desired, choosing a wide loop bandwidth and a high number of successive clock cycles virtually eliminates this characteristic. PLL_LOCK will return to out of lock, if just one cycle is outside the lock detect window or if a cycle slip occurs. Figure 31. CDCE62005 Digital Lock Detect Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 47 Product Folder Links: CDCE62005 |
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