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19-1570; Rev 4; 1/05
EVAALVUAAILTAIOBNLEKIT
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
General Description
The MAX3869 is a complete, single +3.3V laser driver
for SDH/SONET applications up to 2.5Gbps. The
device accepts differential PECL data and clock inputs
and provides bias and modulation currents for driving a
laser. A synchronizing input latch can be used (if a
clock signal is available) to reduce jitter.
An automatic power control (APC) feedback loop is
incorporated to maintain a constant average optical
power over temperature and lifetime. The wide modula-
tion current range of 5mA to 60mA and bias current of
1mA to 100mA are easy to program, making this prod-
uct ideal for use in various SDH/SONET applications.
The MAX3869 also provides enable control, two current
monitors that are directly proportional to the laser bias and
modulation currents, and a failure-monitor output to indi-
cate when the APC loop is unable to maintain the average
optical power. The MAX3869 is available in 32-pin TQFP
and small 32-pin QFN packages as well as dice.
Applications
SONET/SDH Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
2.5Gbps Optical Transmitters
Pin Configuration appears at end of data sheet.
+3.3V
124124124124
MAX3890
SERIALIZER
WITH
CLOCK GEN.
84.584.584.584.5
DATA+
DATA-
CLK+
CLK-
Features
Single +3.3V or +5V Power Supply
64mA Supply Current at +3.3V
Programmable Bias Current from 1mA to 100mA
Programmable Modulation Current from
5mA to 60mA
Bias Current and Modulation Current Monitors
87ps Rise/Fall Time
Automatic Average Power Control with Failure
Monitor
Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
Enable Control
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3869EHJ
-40°C to +85°C 32 TQFP-EP*
MAX3869EHJ+
-40°C to +85°C 32 TQFP-EP*
MAX3869EGJ
-40°C to +85°C 32 QFN**
MAX3869E/D
-40°C to +85°C Dice***
*Exposed pad.
**Package Code: G3255-1
***Dice are designed to operate over this range, but are tested and
guaranteed at TA = +25°C only. Contact factory for availability.
+Denotes lead-free package.
Typical Application Circuit
+3.3V
25
MAX3869
OUT-
OUT+
BIAS
MD
FERRITE
BEAD
0.01µF
LD
23
0.056µF
BIASMON
MODMON
1000pF
+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.

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC............................................. -0.5V to +7.0V
Current into BIAS ...........................................-20mA to +150mA
Current into OUT+, OUT- ................................-20mA to +100mA
Voltage at BIAS .........................................+1.0V to (VCC + 0.5V)
Continuous Power Dissipation (TA = +85°C)
32-Pin TQFP-EP (derate 22.2mW/°C above +85°C) ..1444mW
Current into MD.....................................................-5mA to +5mA
32-Pin QFN (derate 20.84mW/°C above +85°C) .......1667mW
Voltage at DATA+, DATA-, CLK+, CLK-, ENABLE,
LATCH, FAIL, BIASMON, MODMON .....-0.5V to (VCC + 0.5V)
Voltage at APCFILT, CAPC, MODSET,
BIASMAX, APCSET ...........................................-0.5V to +3.0V
Storage Temperature Range .............................-65°C to +165°C
Operating Junction Temperature Range ...........-55°C to +150°C
Processing Temperature (die) .........................................+400°C
Lead Temperature (soldering, 10s) .................................+300°C
Voltage at OUT+, OUT-.............................+1.5V to (VCC + 1.5V)
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
(VCC = +3.14V to +5.5V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, IMOD = 30mA, IBIAS = 60mA, TA = +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Current
Bias Current Range
Bias Off-Current
ICC
IBIAS
IBIAS-OFF
Bias-Current Stability
Bias-Current Absolute Accuracy (Note 5)
(Note 2)
(Note 3)
ENABLE = low (Note 4)
APC open loop
IBIAS = 100mA
IBIAS = 1mA
APC open loop
64 112 mA
1 100 mA
100 µA
230
ppm/°C
900
-15 15 %
Differential Input Voltage
Common-Mode Input Voltage
VID
VICM
Figure 1
PECL compatible
200
VCC -
1.49
VCC -
1.32
1600
VCC -
VID/4
mVp-p
V
Clock and Data Input Current
TTL Input High Voltage
IIN
ENABLE, LATCH
-1 10 µA
2.0 V
TTL Input Low Voltage
TTL Output High Voltage FAIL
TTL Output Low Voltage FAIL
ENABLE, LATCH
Sourcing 50µA
Sinking 100µA
0.8
2.4 VCC - 0.3 VCC
0.1 0.44
V
V
V
Monitor-Diode Reverse Bias
Voltage
1.5 V
Monitor-Diode DC Current Range
Monitor-Diode Bias Setpoint
Stability
Monitor-Diode Bias Absolute
Accuracy
IMD
(Note 6)
(Note 5)
IMD = 1mA
IMD = 18µA
18 1000 µA
-480
50
90
480
ppm/°C
-15 15 %
BIASMON to IBIAS Gain
MODMON to IMOD Gain
ABIAS
AMOD
IBIAS/IBIASMON
IMOD/IMODMON
37 A/A
29 A/A
2 _______________________________________________________________________________________

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.14V to +5.5V, load as shown in Figure 2, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, IMOD = 30mA, TA = +25°C.)
(Note 7)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Latch Setup Time
Input Latch Hold Time
Modulation-Current Range
Modulation-Off Current
Modulation-Current Stability
tSU
tH
IMOD
IMOD-OFF
LATCH = high, Figure 3
LATCH = high, Figure 3
ENABLE = low (Note 4)
IMOD = 60mA
IMOD = 5mA
100
100
5
-480
-8
300
ps
ps
60 mA
200 µA
480
ppm/°C
Modulation-Current Absolute
Accuracy
(Note 5)
-15 15 %
Output Rise-Time
Output Fall- Time
tR 20% to 80% (Note 8)
tF 20% to 80% (Note 8)
MAX3869EHJ
MAX3869E/D
MAX3869EHJ
MAX3869E/D
78
69
87 (Note 10)
79
ps
ps
Output Aberrations
(Note 8)
±15 %
Enable and Start-Up Delay
250 ns
Maximum Consecutive Identical
Digits
80 bits
Pulse-Width Distortion
PWD (Notes 8, 9)
14 50 ps
Jitter Generation
Jitter BW = 12kHz to 20MHz, 0-1 pattern
7 20 psp-p
Note 1: Dice are tested at TA = +25°C only.
Note 2: Tested at RMODSET = 2.49k, RBIASMAX = 1.69k, excluding IBIAS and IMOD.
Note 3: Voltage on BIAS pin is (VCC - 1.6V).
Note 4: Both the bias and modulation currents will be switched off if any of the current set pins are grounded.
Note 5: Accuracy refers to part-to-part variation.
Note 6: Assuming that the laser to monitor-diode transfer function does not change with temperature. Guaranteed by design and
characterization.
Note 7: AC characteristics are guaranteed by design and characterization.
Note 8: Measured with 622Mbps 0-1 pattern, LATCH = high.
Note 9: PWD = (wider pulse - narrower pulse) / 2.
Note 10: See Typical Operating Characteristics for worst-case distribution.
DATA+
DATA-
(DATA+) - (DATA-)
IOUT+
100mV MIN
800mV MAX
200mVp-p MIN
1600mVp-p MAX
IMOD
Figure 1. Required Input Signal and Output Polarity
_______________________________________________________________________________________ 3

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
VCC
A
A
A, B ARE SMD FERRITE BEADS:
B = BLM11A601S MURATA ELECTRONICS
A = BLM21A102S MURATA ELECTRONICS
MAX3869
B
B
OUT-
OUT+
IOUT+
BIAS
15
0.056µF
25
0.056µF
OSCILLOSCOPE
5050
VCC
Figure 2. Output Termination for Characterization
CLK
DATA
tSU
tCLK = 402ps
tH
Figure 3. Setup/Hold Time Definition
Typical Operating Characteristics
(VCC = +3.3V, load as shown in Figure 2, TA = +25°C, unless otherwise noted.)
EYE DIAGRAM
(2.488Gbps, 1300nm FP LASER,
1.87GHz FILTER, 32 TQFP-EP)
48ps/div
MITSUBISHI ML725C8F LASER DIODE
TYPICAL DISTRIBUTION OF FALL TIME
25
32 TQFP-EP
IMOD = 30mA
20
15
MEAN = 87.3ps
σ = 1.6ps
10
5
0
83 84 85 86 87 88 89 90 91 92
FALL TIME (ps)
DISTRIBUTION OF FALL TIME
(WORST-CASE CONDITIONS)
35
32 TQFP-EP
30 IMOD = 60mA
VCC = 3.14V
25 TA = +85°C
20
15
MEAN = 119.1ps
σ = 2.0ps
10
5
0
113 114.5 116 117.5 119 120.5 122 123.5 125 126.5
FALL TIME (ps)
4 _______________________________________________________________________________________

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
Typical Operating Characteristics (continued)
(VCC = +3.3V, load as shown in Figure 2, TA = +25°C, unless otherwise noted.)
ELECTRICAL EYE DIAGRAM
(IMOD = 30mA, 213-1 +80 CID, 32 TQFP-EP)
ELECTRICAL EYE DIAGRAM
(IMOD = 60mA, 213-1 +80 CID, 32 TQFP-EP)
120
100
80
60
40
20
0
1
100ps/div
IBIASMAX vs. RBIASMAX
10
RBIASMAX (k)
100
300
100
90
80
70
60
50
40
30
20
10
0
1
100ps/div
IMOD vs. RMODSET
10
RMODSET (kΩ)
100
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
5
RANDOM JITTER vs. IMOD
10 15 20 25 30 35 40 45 50
IMOD (mA)
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1
IMD vs. RAPCSET
1 10
RAPCSET (k)
100
SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDE IBIAS, IMOD, 25LOAD)
100
90
80 VCC = +5.5V
70
60 VCC = +3.14V
50
40
30
20
10
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
BIAS-CURRENT MONITOR GAIN
vs. TEMPERATURE
50
40 IBIAS = 100mA, IMOD = 50mA
IBIAS = 10mA, IMOD = 10mA
30
20
10
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5