19-1537; Rev 4; 3/09
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
MAX376
General Description
Features
The MAX3676 is a complete clock-recovery and data-
retiming IC incorporating a limiting amplifier. It is intend-
ed for 622Mbps SDH/SONET applications and operates
from a single +3.3V supply.
♦ Single +3.3V or +5.0V Power Supply
♦ Exceeds ITU/Bellcore SDH/SONET Regenerator
Specifications
♦ Low Power: 237mW at +3.3V
The MAX3676 is designed for both section-regenerator
and terminal-receiver applications in OC12/STM-4 trans-
mission systems. Its jitter performance exceeds all
SONET/SDH specifications.
♦ Selectable Data Inputs, Differential PECL or
Analog
♦ Received-Signal-Strength Indicator
The MAX3676 has two differential input amplifiers: one
accepts positive-referenced emitter-coupled logic
(PECL) levels, while the other accepts small-signal ana-
log levels. The analog inputs access the limiting amplifi-
er stage, which provides both a received-signal-strength
indicator (RSSI) and a programmable-threshold loss-of-
power (LOP) monitor. Selecting the PECL amplifier dis-
ables the limiting amplifier, conserving power. A
loss-of-lock (LOL) monitor is also incorporated as part of
the fully integrated phase-locked loop (PLL).
♦ Loss-of-Power and Loss-of-Lock Monitors
♦ Differential PECL Clock and Data Outputs
♦ No External Reference Clock Required
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
MAX3676EHJ
MAX3676EHJ+
32 TQFP
Applications
+Denotes a lead(Pb)-free/RoHS-compliant package.
SDH/SONET Receivers and Regenerators
SDH/SONET Access Nodes
Add/Drop Multiplexers
Pin Configuration appears at end of data sheet.
ATM Switches
Digital Cross-Connects
Typical Operating Circuit
+3.3V
C
LOL
C
2.2μF
F
+3.3V
0.01μF
+3.3V
130Ω
130Ω
0.1μF
0.01μF
Z
Z
= 50Ω
O
FIL+
FIL- LOL
SDO+
INSEL PHADJ+ PHADJ-
DDI+
= 50Ω
O
V
CC
FILT
DDI-
SDO-
82Ω
82Ω
C
IN
100pF
MAX3664
0.01μF
INREF
PHOTO-
DIODE
OUT+
Z
Z
= 50Ω
ADI+
ADI-
O
MAX3676
+3.3V
100Ω
= 50Ω
IN
SCLKO+
SCLKO-
OUT-
O
130Ω
130Ω
C
IN
+3.3V
0.01μF
GND
COMP
Z
Z
= 50Ω
= 50Ω
O
V
CC
220pF
CFILT OLC+ OLC- GND
RSSI
INV
VTH LOP
O
C
FILT
47nF
82Ω
82Ω
C
33nF
OLC
R2
R1
20k
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.