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CDCE62002 Datasheet(PDF) 29 Page - Texas Instruments

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Part # CDCE62002
Description  Four Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs
PDF  49 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CDCE62002 Datasheet(HTML) 29 Page - Texas Instruments

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Reference Input Buffer
UniversalInputControl
PN
PP
Register 0
0
1
4
Register 0
0
5
REF_IN
Vbb
1uF
Vbb
0.0
0.1
0.4
0.5
INBUFSELX
INBUFSELY
ACDCSEL
TERMSEL
P
N
VBB
0
0
X
1
OFF OFF
0
1
1
OFF
1
0
0
0
ON
ON
0
1
0
ON
ON
SWITCHStatus VBB
Settings
1
X
X
0
ON
ON
1
1
0
1.9V
ON
ON
1.2V
1.2V
1.2V
BitName -->
Register.Bit -->
INBUFSELX
INBUFSELY
0.0
0.1
LVDS
0
0
Disabled
0
1
LVPECL
1
0
LVCMOS
1
1
InputBufferSelect
InputBuffer
Mode
5k
5k
Smart Multiplexer Dividers
ReferenceDivider
/1 - /8
REF_IN
XTAL /
AUX _IN
Smart
MUX
SmartMUX
Control
2
3
Register 0
8
7
6
Register 0
9
1
Register 0
SmartMultiplexer
Pre-Divider
/1 or /2
0
REFSEL AUXSEL
0.2
0.3
AUXSelect
0
0
Reserved
1
0
REFSelect
0
1
AutoSelect
1
1
Setting
SmartMux
Mode
CDCE62002
www.ti.com.............................................................................................................................................................. SCAS882A – JUNE 2009 – REVISED JULY 2009
Figure 22 shows the key elements of a Universal Input Buffer (UIB). A UIB supports multiple formats along with
different termination and coupling schemes. The CDCE62002 implements the UIB by including on board
switched termination, a programmable bias voltage generator, and a multiplexer. The CDCE62002 provides a
high degree of configurability on the UIB to facilitate most existing clock input formats.
Figure 22. CDCE62002 Universal Input Buffer
Figure 23. CDCE62002 Smart Multiplexer
In Auto Select Mode the Smart Mux switches automatically between Reference input and Auxiliary input with a
preference to the Reference input. In order for the Smart Mux to function correctly the frequency after the
reference divider and the Auxiliary Input signal frequency should be within 20% of each other or one of them
should be zero or ground. In This mode a valid frequency needs to be present on AUX_IN before the /PD is
deasserted or power is applied.
Copyright © 2009, Texas Instruments Incorporated
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