19-1631; Rev 0; 1/00
2.5Gbps, Low-Power, +3.3V
Clock Recovery and Data Retiming IC
General Description
Features
The MAX3876 is a compact, low-power clock recovery
and data retiming IC for 2.488Gbps SDH/SONET appli-
cations. The fully integrated phase-locked loop (PLL)
recovers a synchronous clock signal from the serial
NRZ data input. The data is retimed by the recovered
clock. Differential CML outputs are provided for both
clock and data signals, and an additional 2.488Gbps
serial input is available for system loopback diagnostic
testing. The device also includes a TTL-compatible
loss-of-lock (LOL) monitor.
ꢀ Exceeds ANSI, ITU, and Bellcore SONET/SDH
Regenerator Specifications
ꢀ 440mW Power Dissipation (at +3.3V)
ꢀ Clock Jitter Generation: 3.7mUI
RMS
ꢀ +3.3V or +5V Single Power Supply
ꢀ Fully Integrated Clock Recovery and Data Retiming
ꢀ Additional High-Speed Input Facilitates System
Loopback Diagnostic Testing
The MAX3876 is designed for both section-regenerator
and terminal-receiver applications in OC-48/STM-16
transmission systems. Its jitter performance exceeds all
of the SONET/SDH specifications.
ꢀ Tolerates >2500 Consecutive Identical Digits
ꢀ Loss-of-Lock Indicator
ꢀ Differential CML Data and Clock Outputs
This device operates from a +3.3V or +5.0V single sup-
ply over a -40°C to +85°C temperature range. Power
consumption is typically only 445mW with a +3.3V sup-
ply. The MAX3876 is available in a 32-pin TQFP pack-
age as well as in die form.
Ordering Information
Applications
SDH/SONET Receivers and Regenerators
Add/Drop Multiplexers
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
MAX3876EHJ
MAX3876E/D
Dice*
Digital Cross-Connects
*Dice are designed to operate over this range, but are tested
2.488Gbps ATM Receiver
and guaranteed at T = +25°C only. Contact factory for
A
Digital Video Transmission
availability.
Pin Configuration appears at end of data sheet.
SDH/SONET Test Equipment
Intrarack/Subrack Interconnects
Typical Application Circuit
+3.3V
+3.3V
TTL
0.01µF
+3.3V
V
LOL
CC
FILT
IN
V
CC
SDO+
SDO-
OUT+
OUT-
PHOTO-
DIODE
SDI+
SDI-
MAX3866
0.01µF
MAX3831
PREAMPLIFIER
MAX3876
4:1/1:4
TRANSCEIVER
SLBI+
SLBI-
SCLKO+
SCLKO-
SIS
FIL+
FIL-
SYSTEM
LOOPBACK
TTL
1µF
________________________________________________________________ Maxim Integrated Products
1
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