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CDCE62002 Datasheet(PDF) 36 Page - Texas Instruments |
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CDCE62002 Datasheet(HTML) 36 Page - Texas Instruments |
36 / 49 page Loop Filter PFD/ CP EXT_LFN EXT_LFP external internal external internal + - VB C1 R2 C2 R3 C3 24 Registers 0 23 25 22 CDCE62002 SCAS882A – JUNE 2009 – REVISED JULY 2009.............................................................................................................................................................. www.ti.com Figure 28 depicts the loop filter topology of the CDCE62002. It facilitates both internal and external implementations providing optimal flexibility. Figure 28. CDCE62002 Loop Filter Topology Internal Loop Filter Component Configuration Figure 28 illustrates the switching between four fixed internal loop filter settings and the external loop filter setting. Table 19 shows that the CDCE62002 has 16 settings different settings for the loop filter. Four of the settings are internal and twelve are external. Table 19. CDCE62002 Loop Filter Settings Charge LFRCSEL 3 db Corner Pump 3 2 1 0 Loop Filter C1 C2 R2 R3 C3 C3R3 Current 0 0 0 0 Internal 1.5 pF 473.5 pF 4.0k 5k 2.5 pF 12 MHz 1.5 mA 0 0 0 1 Internal 1.5 pF 473.5 pF 4.0k 5k 2.5 pF 12 MHz 400 µA 0 0 1 0 Internal 1.5 pF 473.5 pF 2.7k 5k 2.5 pF 12 MHz 250 µA 0 0 1 1 Internal 1.5 pF 473.5 pF 2.7k 5k 2.5 pF 12 MHz 150 µA 0 1 0 0 External X X X 20k 112 pF 70 kHz 1.0 mA 0 1 0 1 External X X X 20k 112 pF 70 kHz 2.0 mA 0 1 1 0 External X X X 20k 112 pF 70 kHz 3.0 mA 0 1 1 1 External X X X 20k 112 pF 70 kHz 3.75 mA 1 0 0 0 External X X X 10k 100 pF 150 kHz 1.0 mA 1 0 0 1 External X X X 10k 100 pF 150 kHz 2.0 mA 1 0 1 0 External X X X 10k 100 pF 150 kHz 3.0 mA 1 0 1 1 External X X X 10k 100 pF 150 kHz 3.75 mA 1 1 0 0 External X X X 5k 100 pF 300 kHz 1.0 mA 1 1 0 1 External X X X 5k 64 pF 500 kHz 2.0 mA 1 1 1 0 External X X X 5k 48 pF 700 kHz 3.0 mA 1 1 1 1 External X X X 5k 38 pF 800 kHz 3.75 mA 36 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): CDCE62002 |
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