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MAX3872 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX3872
Description  Multirate Clock and Data Recovery with Limiting Amplifier
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX3872 Datasheet(HTML) 1 Page - Maxim Integrated Products

 
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General Description
The MAX3872 is a compact, multirate clock and data
recovery with limiting amplifier for OC-3, OC-12, OC-24,
OC-48, OC-48 with FEC SONET/SDH and Gigabit
Ethernet (1.25Gbps/2.5Gbps) applications. Without using
an external reference clock, the fully integrated phase-
locked loop (PLL) recovers a synchronous clock signal
from the serial NRZ data input. The input data is then
retimed by the recovered clock, providing a clean data
output. An additional serial input (SLBI
±) is available for
system loopback diagnostic testing. Alternatively, this
input can be connected to a reference clock to maintain a
valid clock output in the absence of data transitions. The
device also includes a loss-of-lock (LOL) output.
The MAX3872 contains a vertical threshold control to
compensate for optical noise due to EDFAs in DWDM
transmission systems. The recovered data and clock
outputs are CML with on-chip 50
Ω back termination on
each line. Its jitter performance exceeds all
SONET/SDH specifications.
The MAX3872 operates from a single +3.3V supply and
typically consumes 580mW. It is available in a 5mm x
5mm 32-pin thin QFN with exposed-pad package and
operates over a -40
°C to +85°C temperature range.
Applications
SONET/SDH Receivers and Regenerators
Add/Drop Multiplexers
Digital Cross-Connects
SONET/SDH Test Equipment
DWDM Transmission Systems
Access Networks
Features
o Multirate Data Input: 2.667Gbps (FEC), 2.488Gbps,
1.244Gbps, 622.08Mbps, 155.52Mbps,
1.25Gbps/2.5Gbps (Ethernet)
o Reference Clock Not Required for Data
Acquisition
o Exceeds ANSI, ITU, and Bellcore SONET/SDH
Jitter Specifications
o 2.7mUIRMS Jitter Generation
o 10mVP-P Input Sensitivity Without Threshold
Adjust
o 0.65UIP-P High-Frequency Jitter Tolerance
o ±170mV Input Threshold Adjust Range
o Clock Holdover Capability Using Frequency-
Selectable Reference Clock
o Serial Loopback Input Available for System
Diagnostic Testing
o Loss-of-Lock (LOL) Indicator
Multirate Clock and Data Recovery
with Limiting Amplifier
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
SDI+
CAZ-
CAZ+ FREFSET VCC
CAZ
0.1
µF
SDI-
SLBI-
SIS LREF LOL
+3.3V
SYSTEM
LOOPBACK DATA
+3.3V
VCTRL
MAX3872
SLBI+
CML
CML
SDO+
SDO-
SCLKO-
CFIL
0.82
µF
SCLKO+
RATESET
RS2
RS1
GND
VREF
+3.3V
+3.3V
VCC_VCO
FIL
+3.3V
FILTER
IN
GND
OUT+
OUT-
VCC
+3.3V
MAX3745*
*FUTURE PRODUCT
Typical Application Circuit
19-2709; Rev 1; 5/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION
KIT
AVAILABLE
Pin Configuration appears at end of data sheet.
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX3872EGJ
-40°C to +85°C
32 QFN
G3255-1


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