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CDCE62005 Datasheet(PDF) 51 Page - Texas Instruments

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Part # CDCE62005
Description  3:5 Clock Generator
Download  85 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

CDCE62005 Datasheet(HTML) 51 Page - Texas Instruments

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5 pF
Locked
Unlocked
80k
110 uA
110 uA
Vcc
PFD/
CP
FromInputDivider
FromFeedbackDivider
C
PLL_LOCK
ToHost
Lock_I
10
3.3
1.8
1.8 10
164
110
=
=
\
@
=
´
=
@
cc
H
Out
C
nF
V
V
V
V
V
n
t
s
´
=
out
V
C
t
i
1
=
´ ´
Vout
i
t
C
CDCE62005
www.ti.com
SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015
8.3.10 Analog Lock Detect
Figure 33 shows the Analog Lock Detect circuit. Depending upon the phase relationship of the two signals
presented at the PFD/CP inputs, the lock detect circuit either charges (if the PLL is locked) or discharges (if PLL
is unlocked) the circuit shown via 110
μA current sources. An external capacitor determines the sensitivity of the
lock detect circuit. The value of the capacitor determines the rate of change of the voltage presented on the
output pin PLL_LOCK and hence how quickly the PLL_LOCK output toggles based on a change of PLL locked
status. The PLL_LOCK pin is an analog output in analog lock detect mode.
(9)
Solving for t yields:
(10)
VH = 0.55 × VCC
(11)
VL = 0.35 × VCC
(12)
For Example, let:
(13)
Figure 33. CDCE62005 Analog Lock Detect
Copyright © 2008–2015, Texas Instruments Incorporated
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