• Low-power (3.3V and 2.5V) operation
(power dissipation approximately 750 mW at 2.5V)
•
No external references
•
Programmable for operation up to 3.2 Gbps
• SmartCenter™ CDR architecture, jitter tolerance
> 0.7 UI
•
196-pin BGA
n e t w o r k a c c e s s p r o d u c t s
2.5 Gbps Quad Clock
and Data Recovery
C X 2 0 4 6 4
The CX20464 is used to retime signals in large switch
matrices. CDRs are critical elements in the SONET/SDH
telecom transmission system, providing internal retiming
of high-speed signals. Conexant’s quad OC-48 CDR is one of
very few commercially available quad 3.2 Gbps retimers, and
can be used with the CX20462 and the CX20472 crosspoint
switches. It enables the development of high-density switch
cores, while substantially reducing the number of ICs on a
single board. This also reduces power dissipation, a critical
objective of today’s telecom system designers.
D i s t i n g u i s h i n g F e a t u r e s
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[3]
LOS[3]
LOL[3]
Doutp/n[3]
Coutp/n[3]
LPPp/n/f[3]
Tclkp/n[3]
EXTRes[3]
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[2]
LOS[2]
LOL[2]
Doutp/n[2]
Coutp/n[2]
LPPp/n/f[2]
Tclkp/n[2]
EXTRes[2]
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[1]
LOS[1]
LOL[1]
Doutp/n[1]
Coutp/n[1]
LPPp/n/f[1]
Tclkp/n[1]
EXTRes[1]
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[0]
LOS[0]
LOL[0]
Doutp/n[0]
Coutp/n[0]
LPPp/n/f[0]
Tclkp/n[0]
EXTRes[0]
SDO
FTEST[0:3,a:d]
TEST[0:3,a:c]
SDI
SCLK
xCS
xRST
xENCLK
Serial Interface
and Registers