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CDCE62005 Datasheet(PDF) 65 Page - Texas Instruments

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Part # CDCE62005
Description  Five/Ten Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs
PDF  80 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CDCE62005 Datasheet(HTML) 65 Page - Texas Instruments

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1
=
´ ´
Vout
i
t
C
´
=
out
V
C
t
i
10
3.3
1.8
1.8 10
164
110
=
=
\
@
=
´
=
@
cc
H
Out
C
nF
V
V
V
V
V
n
t
s
5 pF
Locked
Unlocked
80k
110 uA
110 uA
Vcc
PFD/
CP
FromInputDivider
FromFeedbackDivider
C
PLL_LOCK
ToHost
Lock_I
CDCE62005
www.ti.com
SCAS862C – NOVEMBER 2008 – REVISED FEBRUARY 2010
Analog Lock Detect
Figure 38 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 100mA 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.
(7)
Solving for t yields:
(8)
VH = 0.55 × VCC
VL = 0.35 × VCC
For Example, let:
(9)
Figure 38. CDCE62005 Analog Lock Detect
Copyright © 2008–2010, Texas Instruments Incorporated
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