MAX3676EHJ+ Maxim Integrated Products, MAX3676EHJ+ Datasheet

IC CLOCK RECOVERY 32-TQFP

MAX3676EHJ+

Manufacturer Part Number
MAX3676EHJ+
Description
IC CLOCK RECOVERY 32-TQFP
Manufacturer
Maxim Integrated Products
Type
Clock and Data Recovery (CDR)r
Datasheet

Specifications of MAX3676EHJ+

Input
PECL
Output
PECL
Frequency - Max
622MHz
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-TQFP, 32-VQFP
Frequency-max
622MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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).
19-1537; Rev 4; 3/09
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.
SDH/SONET Receivers and Regenerators
SDH/SONET Access Nodes
Add/Drop Multiplexers
ATM Switches
Digital Cross-Connects
PHOTO-
DIODE
100pF
________________________________________________________________ Maxim Integrated Products
Data-Retiming IC with Limiting Amplifier
FILT
INREF
IN
General Description
GND
MAX3664
COMP
+3.3V
622Mbps, 3.3V Clock-Recovery and
V
OUT+
CC
OUT-
220pF
Applications
0.01μF
Z
Z
O
O
= 50Ω
= 50Ω
100Ω
+3.3V
0.01μF
0.01μF
C
47nF
C
C
FILT
IN
IN
0.1μF
DDI+
DDI-
ADI+
ADI-
V
CFILT OLC+ OLC-
CC
+3.3V
INSEL
PHADJ+ PHADJ-
C
33nF
OLC
♦ ♦ Single +3.3V or +5.0V Power Supply
♦ ♦ Exceeds ITU/Bellcore SDH/SONET Regenerator
♦ ♦ Low Power: 237mW at +3.3V
♦ ♦ Selectable Data Inputs, Differential PECL or
♦ ♦ Received-Signal-Strength Indicator
♦ ♦ Loss-of-Power and Loss-of-Lock Monitors
♦ ♦ Differential PECL Clock and Data Outputs
♦ ♦ No External Reference Clock Required
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.
MAX3676EHJ
MAX3676EHJ+
Specifications
Analog
GND
MAX3676
PART
RSSI
FIL+
INV
2.2μF
Typical Operating Circuit
C
20k
R1
F
R2
FIL-
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
VTH LOP
SCLKO+
SCLKO-
Ordering Information
SDO+
SDO-
LOL
Z
Z
O
O
Z
Z
C
0.01μF
O
O
= 50Ω
= 50Ω
LOL
= 50Ω
= 50Ω
82Ω
82Ω
130Ω
130Ω
PIN-PACKAGE
32 TQFP
32 TQFP
+3.3V
+3.3V
Features
82Ω
82Ω
130Ω
130Ω
1

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MAX3676EHJ+ Summary of contents

Page 1

... Received-Signal-Strength Indicator ♦ ♦ Loss-of-Power and Loss-of-Lock Monitors ♦ ♦ Differential PECL Clock and Data Outputs ♦ ♦ No External Reference Clock Required PART MAX3676EHJ MAX3676EHJ+ Applications + Denotes a lead(Pb)-free/RoHS-compliant package. Pin Configuration appears at end of data sheet. +3.3V 0.1μF 0.01μ ...

Page 2

Clock-Recovery and Data-Retiming IC with Limiting Amplifier ABSOLUTE MAXIMUM RATINGS Supply Voltage, V ..............................................-0.5V to +6.5V CC Input Voltage Levels, DDI+, DDI-, ADI+, ADI- ...........................-0. Input Differential Voltage (ADI+) - (ADI-)...............................±3V PECL Output Currents, SDO+, SDO-, ...

Page 3

Clock-Recovery and Data-Retiming IC with Limiting Amplifier AC ELECTRICAL CHARACTERISTICS (V = +3.0V to +5.5V -40°C to +85°C, unless otherwise noted. Typical values are (Notes 2, 3) PARAMETER SYMBOL Differential Input Voltage ...

Page 4

Clock-Recovery and Data-Retiming IC with Limiting Amplifier (V = +3.3V +25°C, unless otherwise noted RECOVERED DATA AND CLOCK (SINGLE-ENDED PATTERN 400ps/div JITTER TOLERANCE PATTERN 1 BELLCORE MASK ...

Page 5

Clock-Recovery and Data-Retiming IC with Limiting Amplifier (V = +3.3V +25°C, unless otherwise noted LOSS-OF-POWER HYSTERESIS vs. TEMPERATURE 5 PATTERN V = +3.3V OR +5.0V CC 4.5 4.0 3.5 3.0 2.5 ...

Page 6

Clock-Recovery and Data-Retiming IC with Limiting Amplifier PIN NAME 1 OLC+ Positive Offset-Correction Loop Capacitor Input 2 OLC- Negative Offset-Correction Loop Capacitor Input 3 RSSI Received-Signal-Strength Indicator Output 4, 8, 16, GND Supply Ground 24 INV ...

Page 7

Clock-Recovery and Data-Retiming IC with Limiting Amplifier LOL V CC 6kΩ DDI+ DDI- PECL INSEL ADI- LIMITER BIAS 42dB ADI+ POWER DETECT OFFSET CORRECTION OLC+ OLC- CFILT Figure 1. Functional Diagram _______________Detailed Description The block diagram in Figure ...

Page 8

Clock-Recovery and Data-Retiming IC with Limiting Amplifier The phase detector produces a voltage proportional to the phase difference between the incoming data and the internal clock. Because of its feedback nature, the PLL drives the error voltage to ...

Page 9

Clock-Recovery and Data-Retiming IC with Limiting Amplifier The comparator is configured with an active-high LOP output. An on-chip, 6kΩ pull-up resistor is provided to reduce the external part count. Setting the Loop Filter The MAX3676 is designed for ...

Page 10

Clock-Recovery and Data-Retiming IC with Limiting Amplifier Note that the LOL monitor is only valid when a data stream is present on the inputs to the MAX3676 result, LOL does not detect a loss-of-power condition resulting ...

Page 11

Clock-Recovery and Data-Retiming IC with Limiting Amplifier Reduced Power Consumption Without the Limiting Amplifier The limiting amplifier is biased independently from the clock recovery circuitry. Grounding INSEL turns off the limiting amplifier and selects the PECL DDI inputs. ...

Page 12

Clock-Recovery and Data-Retiming IC with Limiting Amplifier Optical receivers, incorporating transimpedance preamplifiers and limiting postamplifiers, can signifi- cantly clean up the effects of dispersion and attenua- tion. In addition, these amplifiers can provide fast transitions with minimal aberrations ...

Page 13

Clock-Recovery and Data-Retiming IC with Limiting Amplifier allowable pattern-dependent jitter, peak-to-peak (seconds); and BW = typical system bandwidth, nor- mally 0.6 to 1.0 times the data rate (Hertz). If the PDJ is still larger than desired, continue increasing ...

Page 14

Clock-Recovery and Data-Retiming IC with Limiting Amplifier ___________________Pin Configuration TOP VIEW GND 25 DDI+ 26 DDI- 27 MAX3676 INSEL 28 ADI- 29 ADI CFILT 32 TQFP × (5mm 5mm) PLCC 14 ______________________________________________________________________________________ TRANSISTOR COUNT: ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2009 Maxim Integrated Products ...

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