19-2580; Rev 2; 5/04
IT
TION K
VALUA BLE
E
AVAILA
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
General Description
Features
♦
♦
♦
♦
♦
♦
♦
♦
♦
+3.3V or +5.0V Single-Supply Operation
40mA Supply Current at +3.3V
Programmable Bias Current from 1mA to 80mA
Programmable Modulation Current from
5mA to 75mA
Bias Current and Modulation Current Monitors
200ps Rise/Fall Time
Automatic Average Power Control with Failure
Monitor
Complies with ANSI, ITU, and Bellcore
SONET/SDH Specifications
Enable Control
MAX3663
The MAX3663 is a complete, +3.3V laser driver with auto-
matic power-control (APC) circuitry for SDH/SONET appli-
cations up to 622Mbps. It accepts differential PECL
inputs, provides bias and modulation currents, and oper-
ates over a -40°C to +85°C temperature range.
An APC feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range from 5mA to
75mA and bias current of 1mA to 80mA are easy to
program, making this product ideal for use in various
SDH/SONET applications. Two pins are provided to
monitor the current levels in the laser: BIASMON with
current proportional to laser bias current, and MODMON
with current proportional to laser modulation.
The MAX3663 also provides enable control and a failure-
monitor output to indicate when the APC loop is unable
to maintain the average optical power. The MAX3663
is available in a compact 4mm x 4mm 24-pin thin QFN
package.
Ordering Information
PART
MAX3663ETG
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 24 Thin QFN (4mm x 4mm)
Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Regenerators
FTTH/FTTC Applications
MAX3663ETG+ -40°C to +85°C 24 Thin QFN (4mm x 4mm)
+Denotes
lead-free package.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
+3.3V
+3.3V
LASER
ENABLE
FAIL
V
CC
R-
6.3Ω
OUT-
OUT+
R+
20Ω
R
D
5Ω
C
D
1µF
124Ω
124Ω
DATA+
MAX3693
4:1
SERIALIZER
WITH
CLOCK GEN
PECL
DATA-
MAX3663
84.5Ω
84.5Ω
R
FILT
20Ω
C
FILT
5pF
BIASMAX
MODSET
BIASMON
MODMON
APCSET
BIAS
CAPC
GND
MD
FERRITE
BEAD
C
MD
100pF
0.1µF
+3.3V
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
MAX3663
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
.............................................-0.5V to +7.0V
Current into BIAS ............................................-20mA to +150mA
Current into OUT+, OUT- ............................... -20mA to +100mA
Current into MD....................................................-5mA to +5mA
Voltage at DATA+, DATA-,
ENABLE,
FAIL,
BIASMON, MODMON ..................-0.5V to (V
CC
+ 0.5V)
Voltage at OUT+, OUT- .............................+1.5V to (V
CC
+ 1.5V)
Voltage at MODSET, APCSET, BIASMAX,
CAPC............................................................... -0.5V to +3.0V
Voltage at BIAS .........................................+1.0V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +85°C)
24-Lead Thin QFN
(derate 20.8mW/°C above +85°C) ........................1354mW
Operating Junction Temperature Range ...........-55°C to +150°C
Processing Temperature (Die).........................................+400°C
Storage Temperature Range ............................ -65°C to +165°C
Lead Temperature (soldering, 10s) .................................+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
= +3.14V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER
Supply Current
Bias Current Range
Bias Off Current
Bias Current Stability
Bias Current Absolute Accuracy
Differential Input Voltage
Common-Mode Input Voltage
DATA+, DATA- Input Current
Monitor Diode Current Stability
Monitor Diode Current
Absolute Accuracy
DC Monitor Diode Current
BIASMON to I
BIAS
Gain
MODMON to I
MOD
Gain
Monitor Diode Input Voltage
(MD Pin)
TTL Input High Voltage
TTL Input Low Voltage
TTL Output High Voltage (FAIL)
TTL Output Low Voltage (FAIL)
I
MD
A
BIAS
A
MOD
V
MD
V
IH
V
IL
V
OH
V
OL
Sourcing 50µA
Sinking 100µA
2.4
0.1
V
CC
- 0.3
2
0.8
V
CC
0.44
I
BIAS
/I
BIASMON
I
MOD
/I
MODMON
V
ID
V
ICM
I
IN
(Note 3)
I
MD
= 1mA
I
MD
= 18µA (Note 4)
-15
18
38
29
0.8
I
BIAS
SYMBOL
(Note 1)
V
BIAS
= V
CC
- 1.6V
ENABLE
= high (Note 2)
APC open loop
I
BIAS
= 80mA
I
BIAS
= 1mA
-15
200
V
CC
-
1.49
-1
-480
-50
35
+15
1000
V
CC
-
1.32
255
815
+15
1600
V
CC
-
V
ID
/4
+10
+480
1
CONDITIONS
MIN
TYP
40
MAX
60
80
100
UNITS
mA
mA
µA
ppm/°C
%
mV
P-P
V
µA
ppm/°C
%
µA
mA/mA
mA/mA
V
V
V
V
V
APC open loop, 3mA
≤
I
BIAS
≤
80mA
Figure 1
PECL compatible (Table 2)
2
_______________________________________________________________________________________
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
MAX3663
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.14V to +5.5V, load as shown in Figure 2, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V,
T
A
= +25°C.) (Note 6)
PARAMETER
Modulation Current Range
Modulation Off-Current
Modulation Current Stability
Modulation Current Absolute
Accuracy
Output Rise/Fall Time
Jitter Generation (Peak-to-Peak)
Pulse-Width Distortion
(Peak-to-Peak)
Enable/Startup Delay
Maximum Consecutive Identical
Digits at 622Mbps
CID
t
R,
t
F
20% to 80%,
R
L
= 10Ω
| |
20Ω load
(Note 7)
(Notes 8, 9)
Open loop
80
I
MOD
= 5mA
I
MOD
= 75mA
70
10
250
I
MOD
= 5mA
I
MOD
= 75mA
SYMBOL
I
MOD
(Note 6)
ENABLE
= high (Note 2)
I
MOD
= 75mA
I
MOD
= 5mA (Note 4)
-15
100
230
-620
-165
205
+15
200
375
100
155
135
CONDITIONS
MIN
5
TYP
MAX
75
200
+620
UNITS
mA
µA
ppm/°C
%
ps
ps
ps
ns
Bits
Note 1:
Tested with R
MODSET
= 5.11kΩ (I
MOD
≈
38mA), R
BIASMAX
= 4.56kΩ (I
BIAS
≈
52mA), excluding I
BIAS
and I
MOD
.
Note 2:
Both the bias and modulation currents are disabled if any of the current set pins are shorted to ground.
Note 3:
Guaranteed by design and characterization. This assumes that the laser to monitor diode transfer function does not change
with temperature.
Note 4:
See the
Typical Operating Characteristics
for worst-case distributions.
Note 5:
AC characteristics are guaranteed by design and characterization.
Note 6:
Total I
MOD
out of OUT+. See the
Design Procedure
section for information regarding current delivered to the laser.
Note 7:
Input signal is a 622Mbps, 2
13
- 1 PRBS with eighty inserted 0s.
Note 8:
Input signal is a 622Mbps, 11110000 pattern.
Note 9:
PWD = (wider pulse - narrower pulse) / 2.
V
CC
DATA+
DATA-
(DATA+) - (DATA-)
100mV MIN
800mV MAX
OUT-
200mV
P-P
MIN
1600mV
P-P
MAX
20Ω
1µF
10Ω
20Ω
MAX3663
OUT+
1µF
OSCILLOSCOPE
I
OUT
+
I
MOD
I
OUT+
BIAS
12.4Ω
15Ω
V
CC
50Ω
Figure 1. Required Input Signal and Output Polarity
Figure 2. Output Termination for Characterization
3
_______________________________________________________________________________________
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
MAX3663
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
EYE DIAGRAM
(622Mbps, 1300nm LASER
WITH 467MHz FILTER)
2
23
- 1 PRBS
MAX3663 toc01
ELECTRICAL EYE DIAGRAM
(I
MOD
= 35mA)
MAX3663 toc02
ELECTRICAL EYE DIAGRAM
(I
MOD
= 75mA)
622Mbps DATA RATE
MAX3663 toc03
622Mbps DATA RATE
PATTERN = 2
13
- 1 + 80 CID
I
MOD
= 35mA
PATTERN = 2
13
- 1 + 80 CID
I
MOD
= 75mA
200ps/div
200ps/div
200ps/div
MONITOR DIODE CURRENT
vs. APC SET RESISTOR
MAX3663 toc04
BIAS CURRENT
vs. MAXIMUM BIAS SET RESISTOR
MAX3663 toc05
MODULATION CURRENT
vs. MODULATION SET RESISTOR
MAX3663 toc06
10
1000
100
1
I
MD
(mA)
I
BIAS
(mA)
100
I
MOD
(mA)
10
1
1
10
R
APCSET
(kΩ)
100
0.1
1
10
R
BIASMAX
(kΩ)
100
10
0.1
0.01
1
0.1
1
10
R
MODSET
(kΩ)
100
1000
RANDOM JITTER
vs. MODULATON CURRENT
MAX3663 toc07
PULSE-WIDTH DISTORTION
vs. MODULATION CURRENT
MAX3663 toc08
SUPPLY CURRENT
vs. TEMPERATURE
V
CC
= 5.0V
50
SUPPLY CURRENT (mA)
40
30
20
10
0
I
BIAS
= 48mA
I
MOD
= 27mA
-40
-15
10
35
60
85
V
CC
= 3.3V
MAX3663 toc09
21
INCLUDES RANDOM JITTER
DUE TO MEASUREMENT
EQUIPMENT
50
45
40
35
PWD (ps)
60
20
RANDOM JITTER (ps
P-P
)
19
30
25
20
15
18
17
10
5
16
0
20
40
I
MOD
(mA)
60
80
0
0
20
40
I
MOD
(mA)
60
80
TEMPERATURE (°C)
4
_______________________________________________________________________________________
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
MAX3663
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
DISTRIBUTION OF MODULATION CURRENT
STABILITY (WORST CASE)
T
A
= -40°C TO +85°C
I
MOD
= 5mA
MAX3663 toc10
DISTRIBUTION OF MONITOR DIODE CURRENT
STABILITY (WORST CASE)
T
A
= -40°C TO +85°C
I
MD
= 18µA
20
PERCENT OF UNITS (%)
MAX3663 toc11
35
30
25
UNITS (%)
20
15
10
5
0
25
15
10
5
-125
-25
75
175
275
375
475
575
0
-500
MODULATION CURRENT STABILITY (ppm/°C)
-100
100
300
500
-300
MONITOR DIODE CURRENT STABILITY (ppm/°C)
RATIO OF I
MOD
vs. I
MODMON
MAX3663 toc12
RATIO OF I
BIAS
vs. I
BIASMON
40
I
BIAS
/I
BIASMON
(mA/mA)
35
30
25
20
15
10
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
MAX3663 toc13
35
T
A
= +85°C
30
I
MOD
/I
MODMON
(mA/mA)
25
20
15
10
5
0
0
20
40
I
MOD
(mA)
60
T
A
= -40°C
T
A
= +25°C
45
5
0
80
0
20
40
I
BIAS
(mA)
60
80
_______________________________________________________________________________________
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
