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).
♦
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
Features
MAX3676
Ordering Information
PART
MAX3676EHJ
MAX3676EHJ+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
32 TQFP
Applications
SDH/SONET Receivers and Regenerators
SDH/SONET Access Nodes
Add/Drop Multiplexers
ATM Switches
Digital Cross-Connects
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+3.3V
+3.3V
0.1μF
INSEL
V
CC
C
IN
0.01μF
Z
O
= 50Ω
100Ω
IN
OUT-
GND
COMP
220pF
CFILT OLC+ OLC- GND
C
FILT
47nF
C
OLC
33nF
R2
R1
20k
RSSI
INV
VTH LOP
Z
O
= 50Ω
82Ω
82Ω
Z
O
= 50Ω
+3.3V
C
IN
0.01μF
V
CC
ADI-
SCLKO+
130Ω
SCLKO-
Z
O
= 50Ω
130Ω
ADI+
DDI+
DDI-
SDO-
100pF
PHOTO-
DIODE
82Ω
82Ω
PHADJ+
PHADJ-
FIL+
FIL-
LOL
SDO+
Z
O
= 50Ω
Z
O
= 50Ω
C
F
2.2μF
C
LOL
0.01μF
130Ω
0.01μF
+3.3V
130Ω
FILT
MAX3664
INREF
OUT+
MAX3676
+3.3V
________________________________________________________________
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.
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
MAX3676
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..............................................-0.5V to +6.5V
Input Voltage Levels,
DDI+, DDI-, ADI+, ADI- ...........................-0.5V to (V
CC
+ 0.5V)
Input Differential Voltage (ADI+) - (ADI-)...............................±3V
PECL Output Currents, SDO+, SDO-, SCLKO+, SCLKO-...100mA
LOL,
LOP, INSEL, PHADJ+, PHADJ- .........-0.5V to (V
CC
+ 0.5V)
FIL-, OLC+, OLC-, RSSI, VTH ....................-0.5V to (V
CC
+ 0.5V)
(OLC+) - (OLC-).....................................................................±3V
FIL+..................................................Internally connected to V
CC
CFILT ...............................................(V
CC
- 2.5V) to (V
CC
+ 0.5V)
INV.........................................................................-0.5V to +2.0V
Continuous Power Dissipation (T
A
= +85°C)
TQFP (derate 18.7mW/°C above +85°C) ................1214.8mW
Operating Junction Temperature Range ...........-40°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Processing Temperature (die) .........................................+400°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Current
PECL Input-Voltage High
PECL Input-Voltage Low
PECL Input-Current High
PECL Input-Current Low
PECL Output-Voltage High
PECL Output-Voltage Low
LOP, LOL Voltage High
LOP, LOL Voltage Low
INV Input Bias Voltage
SYMBOL
I
CC
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
OH
V
OL
4kΩ between INV and VTH
1.10
1.23
T
A
= 0°C to +85°C
T
A
= -40°C
T
A
= 0°C to +85°C
T
A
= -40°C
CONDITIONS
MAX3676EHJ,
PECL outputs
unterminated
INSEL = V
CC
INSEL = GND
V
CC
- 1.16
V
CC
- 1.81
-10
-10
V
CC
- 1.025
V
CC
- 1.085
V
CC
- 1.81
V
CC
- 1.83
2.4
0.4
1.30
MIN
TYP
72
51
MAX
111
mA
81
V
CC
- 0.88
V
CC
- 1.48
10
10
V
CC
- 0.88
V
CC
- 0.88
V
CC
- 1.620
V
CC
- 1.555
V
V
μA
μA
V
V
V
V
V
UNITS
Note 1:
At T
A
= -40°C, DC characteristics are guaranteed by design and characterization.
2
_______________________________________________________________________________________
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.)
(Notes 2, 3)
PARAMETER
Differential Input Voltage
Range
Input-Referred Noise
Power-Detect Hysteresis
Limiting Amplifier Small-
Signal Bandwidth
RSSI Output Voltage
Threshold Voltage
LOP Threshold Accuracy
RSSI Linearity
RSSI Slope
Loop Bandwidth
Jitter Generation (Note 9)
Jitter-Transfer Peaking
V
TH
BW
SYMBOL
V
ID
V
N
CONDITIONS
BER < 10
-10
, ADI inputs (Note 4)
ADI inputs
(Notes 5, 6)
(Note 7)
(ADI+) - (ADI-) = 2mV
P-P
(ADI+) - (ADI-) = 20mV
P-P
(Note 6)
(Note 6)
(ADI+) - (ADI-) = 2mV
P-P
to 50mV
P-P
(ADI+) - (ADI-) = 2mV
P-P
to 50mV
P-P
(Note 8)
C
F
= 2.2μF
C
F
= 2.2μF
C
F
= 2.2μF
f = 10kHz
Jitter Tolerance (Note 10)
C
F
= 2.2μF
f = 25kHz
f = 250kHz
f = 1MHz
Maximum Consecutive Input
Run Length (1 or 0)
Clock Transition Time
Data Transition Time
Serial Clock-to-Q Delay
Serial Clock Frequency
tr, tf
tr, tf
t
CLK-Q
f
SCLK
20% to 80%
20% to 80%
140
(Note 11)
0.55
0.45
-2
±0.7
26
250
2.0
0.03
8.9
3.64
0.77
0.69
1200
205
180
275
622.08
245
230
400
Bits
ps
ps
ps
MHz
UI
500
2.6
0.08
3
650
1.40
1.93
1.41
+2
MIN
0.003
80
6
TYP
MAX
1.2000
UNITS
V
P-P
μV
RMS
dB
MHz
V
V
dB
%
mV/dB
kHz
mUI
dB
MAX3676
Note 2:
AC parameters are guaranteed by design and characterization.
Note 3:
The MAX3676 is characterized with a PRBS of 2
23
- 1 maintaining a BER of
≤
10
-10
having a confidence level of 99.9%.
Note 4:
A lower minimum input voltage of 2mV
P-P
is achievable; however, the LOP hysteresis is not guaranteed below 3.6mV
P-P
.
Note 5:
Hysteresis = 20log(V
RELEASE
/V
ASSERT
).
Note 6:
R
1
= 20kΩ, R
2 =
3.0kΩ, resulting in V
RELEASE
≈
3.6mV
P-P
.
Note 7:
Small-signal bandwidth cannot be measured directly.
Note 8:
RSSI slope = [V
RSSI2
- V
RSSI1
]/[20log (V
ID2
/V
ID1
)].
Note 9:
1UI = 1 unit interval = (622.08MHz)
-1
= 1.608ns.
Note 10:
At jitter frequencies <10kHz, the jitter tolerance characteristics exceed the ITU/Bellcore specifications. The low-frequency
jitter tolerance outperforms the instrument’s measurement capability.
Note 11:
See
Typical Operating Characteristics
for worst-case distribution.
_______________________________________________________________________________________
3
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
MAX3676
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
RECOVERED DATA AND
CLOCK (SINGLE-ENDED)
MAX3676 toc01
RECOVERED CLOCK JITTER
2
23
-1 PATTERN
DATA
BIT-ERROR RATE
MAX3676 toc02
BIT-ERROR RATE
vs. ADI INPUT VOLTAGE
10
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
400μ 500μ 600μ 700μ 800μ 900μ 1m 1.1m 1.2m
INPUT VOLTAGE (V)
2
23
-1 PATTERN
MAX3676 toc03
10
-2
2
23
-1 PATTERN
CLOCK
WIDEBAND RMS
JITTER = 5.84ps
400ps/div
20ps/div
JITTER TOLERANCE
MAX3676 toc04
JITTER TRANSFER
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
-1.8
-2.0
-2.2
-2.4
-2.6
-2.8
-3.0
2k
MAX3676 toc05
DISTRIBUTION OF JITTER TOLERANCE
(WORST-CASE CONDITIONS)
MEAN = 2.42UI
σ
= 0.227UI
f
JITTER
= 25kHz
V
CC
= +3.0V
T
A
= +85°C
MAX3676 toc06
10
2
23
-1 PATTERN
30
25
PERCENT OF UNITS (%)
20
15
10
5
0
1
JITTER TRANSFER (dB)
BELLCORE
MASK
INPUT JITTER (UI
P-P
)
BELLCORE
MASK
0.1
10k
100k
1M
10M
JITTER FREQUENCY (Hz)
2
23
- 1 PRBS
10k
100k
700k
1.5
2.0 2.2 2.4 2.6 2.8 3.0
JITTER TOLERANCE (UI
P-P
)
3.5
JITTER FREQUENCY (Hz)
4
_______________________________________________________________________________________
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
LOSS-OF-POWER
ASSERT AND RELEASE LEVEL
vs. DETECTOR THRESHOLD VOLTAGE
2
23
-1 PATTERN
ANALOG VOLTAGE (mVp-p)
MAX3676 toc09
MAX3676
LOSS-OF-POWER
HYSTERESIS vs. TEMPERATURE
2
23
-1 PATTERN
V
CC
= +3.3V OR +5.0V
MAS3676 toc07
RECEIVED-SIGNAL-STRENGTH INDICATOR
vs. INPUT VOLTAGE
2.5
2.3
2
23
-1 PATTERN
MAX3676 toc08
5.0
4.5
HYSTERESIS (dB)
4.0
2.7
100
LOP RELEASE
10
LOP ASSERT
RSSI (V)
2.1
1.9
1.7
1.5
1010 PATTERN
3.5
3.0
2.5
2.0
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (°C)
1.3
1.1
0.1
1.0
10
100
1000
INPUT VOLTAGE (mV
P-P
)
1
1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4
DETECTOR THRESHOLD VOLTAGE, V
TH
(V)
RECEIVED-SIGNAL-STRENGTH INDICATOR
vs. INPUT VOLTAGE
MAX3676 toc10
SUPPLY CURRENT
vs. TEMPERATURE
MAX3676 toc11
2.7
2.5
2.3
RSSI (V)
2.1
1.9
1.7
1.5
1.3
1.1
0.1
1.0
10
100
2
23
-1 PATTERN
V
CC
= +3.3V OR +5.0V
100
90
SUPPLY CURRENT (mA)
80
70
60
50
40
30
-40
-20
0
20
40
60
80
V
CC
= +3.3V
V
CC
= +5.0V
1000
100
INPUT VOLTAGE (mV
P-P
)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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