MAX3676_09 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 622Mbps, 3.3V Clock-Recovery and Data-Retiming IC with Limiting Amplifier

19-1537; Rev 4; 3/09
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
General Description
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.
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.
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).
Applications
SDH/SONET Receivers and Regenerators
SDH/SONET Access Nodes
Add/Drop Multiplexers
ATM Switches
Digital Cross-Connects
Features
♦ Single +3.3V or +5.0V Power Supply
♦ Exceeds ITU/Bellcore SDH/SONET Regenerator
Specifications
♦ Low Power: 237mW at +3.3V
♦ Selectable Data Inputs, Differential PECL or
Analog
♦ Received-Signal-Strength Indicator
♦ Loss-of-Power and Loss-of-Lock Monitors
♦ Differential PECL Clock and Data Outputs
♦ No External Reference Clock Required
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3676EHJ
-40°C to +85°C
32 TQFP
MAX3676EHJ+
-40°C to +85°C
32 TQFP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
100pF
PHOTO-
DIODE
+3.3V
+3.3V
C_F
2.2μF
0.01μF
0.1μF
INSEL PHADJ+ PHADJ-
FIL+
FIL- LOL
DDI+
V_CC
FILT
DDI-
MAX3664
INREF
OUT+
Z_O = 50Ω
C_IN
0.01μF
ADI+
MAX3676
100Ω
IN
OUT-
Z_O = 50Ω
ADI-
GND COMP
220pF
+3.3V
C_IN
0.01μF
V_CC
CFILT OLC+ OLC- GND RSSI INV
SDO+
SDO-
SCLKO+
SCLKO-
VTH LOP
C_FILT
47nF
C_OLC
33nF
R2
R1
20k
C_LOL
0.01μF
+3.3V
130Ω
130Ω
Z_O = 50Ω
Z_O = 50Ω
82Ω
82Ω
+3.3V
130Ω
Z_O = 50Ω
Z_O = 50Ω
82Ω
130Ω
82Ω
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.