19-2710; Rev 4; 7/06
2.488Gbps/2.667Gbps Clock and
Data Recovery with Limiting Amplifier
General Description
Features
♦ 2.488Gbps and 2.667Gbps Input Data Rates
The MAX3874 is a compact, dual-rate clock and data
recovery with limiting amplifier for OC-48 and OC-48
with FEC SONET/SDH 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 this 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.
♦ Reference Clock Not Required for Data
Acquisition
♦ Exceeds ANSI, ITU, and Bellcore SONET/SDH
Jitter Specifications
♦ 2.7mUI
Clock Jitter Generation
RMS
♦ 10mV
Input Sensitivity Without Threshold
P-P
Adjust
♦ 0.65UI
High-Frequency Jitter Tolerance
P-P
♦ ±170mV Wide Input Threshold Adjust Range
The MAX3874 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 50Ω back termination on
each line. Its jitter performance exceeds all SONET/
SDH specifications. The MAX3874A is the MAX3874
with a voltage-controlled oscillator (VCO) centered at
2.0212GHz.
♦ Clock Holdover Capability Using Frequency-
Selectable Reference Clock
♦ Serial Loopback Input Available for System
Diagnostic Testing
♦ Loss-of-Lock (LOL) Indicator
♦ Small 5mm ✕ 5mm 32-Pin QFN Package
The MAX3874 operates from a single +3.3V supply and
typically consumes 580mW. It is available in a 5mm ✕
5mm 32-pin QFN with exposed pad package and oper-
ates over the -40°C to +85°C temperature range.
Ordering Information
PIN-
PKG
PART
TEMP RANGE
PACKAGE
CODE
Applications
SONET/SDH Receivers and Regenerators
Add/Drop Multiplexers
32 QFN
32 QFN
32 TQFN
MAX3874EGJ
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
G3255-1
G3255-1
T3255-3
MAX3874AEGJ**
MAX3874AETJ+**
Digital Cross-Connects
**Contains a VCO centered at 2.0212GHz.
+Denotes lead-free package.
SONET/SDH Test Equipment
DWDM Transmission Systems
Access Networks
Pin Configuration appears at end of data sheet.
Typical Application Circuit
+3.3V
+3.3V
CAZ
0.1µF
C
FIL
+3.3V +3.3V
0.068µF
V
CC
FIL VCC_VCO CAZ- CAZ+ FREFSET V
CC
FILTER
OUT+
OUT-
SDI+
2.488Gbps DATA
MAX3745
SDO+
SDO-
SDI-
CML
CML
IN
SLBI+
SLBI-
MAX3874
GND
SCLKO+
SCLKO-
+3.3V
V
V
CTRL
REF
2.488Gbps SYSTEM
LOOPBACK DATA
SIS
LREF LOL
+3.3V
RATESET GND
________________________________________________________________ Maxim Integrated Products
1
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.
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