CDCE62002 Datasheet, PDF (40/49 Pages) Texas Instruments – Four Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs

CDCE62002
SCAS882A – JUNE 2009 – REVISED JULY 2009.............................................................................................................................................................. www.ti.com
SERDES Startup and Clock Cleaner
The CDCE62002 can serve as a SERDES device companion by providing a crystal based reference for the
SERDES device to lock to receive data stream and when the SERDES locks to the data and outputs the
recovered clock the CDCE62002 can switch and use the recovered clock and serve as a jitter cleaner.
Data
SERDES
Cleaned Clock
Recovered Clock
REF_IN
XTAL /AUX_IN
EXT_LFP
Reference
Divider
Input
Divider
Feedback
Divider
PFD /
CP
EXT _LFN
Output
Divider 0
Prescaler
Output
Divider 1
U0P
U0N
U1P
U1N
Figure 34. CDCE62002 Clocking SERDES
Since the jitter of the recovered clock can be above 100 ps (RMS) the output jitter from CDCE62002 can be as
low and 6 ps (RMS) depending on the external loop filter configuration.
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