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19-4769; Rev 0a; 9/98
EVAALVUAAILTAIOBNLEKIT
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
General Description
The MAX3867 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. The synchronizing input latch can be bypassed if
a clock signal is not available.
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 MAX3867 also provides enable control, a program-
mable slow-start circuit to set the laser turn-on delay,
and a failure-monitor output to indicate when the APC
loop is unable to maintain the average optical power.
The MAX3867 is available in a small 48-pin TQFP pack-
age as well as dice.
Applications
SONET/SDH Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
2.5Gbps Optical Transmitters
Features
o Single +3.3V or +5V Power Supply
o 62mA Supply Current at +3.3V
o Programmable Modulation Current from
5mA to 60mA
o Programmable Bias Current from 1mA to 100mA
o Rise/Fall Time < 90ps
o Automatic Average Power Control with Failure
Monitor
o Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
o Enable Control
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3867ECM
-40°C to +85°C 48 TQFP
MAX3867E/D
-40°C to +85°C Dice*
*Dice are designed to operate over this range, but are tested and
guaranteed at TA = +25°C only. Contact factory for availability.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+3.3V
+3.3V
124124124124
MAX3890
SERIALIZER
WITH
CLOCK GEN.
84.584.584.584.5
DATA+
DATA-
CLK+ MAX3867
CLK-
25
OUT-
OUT+
BIAS
MD
*FERRITE
BEAD
LD
20
0.056µF
1000pF
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC............................................. -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-, CLK+, CLK-,
ENABLE, LATCH, FAIL, SLWSTRT.........-0.5V to (VCC + 0.5V)
Voltage at APCFILT, CAPC, MODSET,
BIASMAX, APCSET ...........................................-0.5V to +3.0V
Voltage at OUT+, OUT-.............................+1.5V to (VCC + 1.5V)
Voltage at BIAS .........................................+1.0V to (VCC + 0.5V)
Current into FAIL ...............................................-10mA to +30mA
Continuous Power Dissipation (TA = +85°C)
TQFP (derate 20.8mW/°C above +85°C) ...................1354mW
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, 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
(VCC = +3.14V to +5.5V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, IMOD = 30mA, IBIAS = 60mA, and TA = +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Current
ICC (Note 2)
62 105 mA
Bias Current Range
IBIAS (Note 3)
1 100 mA
Bias Off Current
IBIAS-OFF
Bias-Current Stability
Bias-Current Absolute Accuracy (Note 5)
ENABLE = low (Note 4)
APC open loop, IBIAS = 100mA
APC open loop, IBIAS = 1mA
APC open loop
100 µA
230
ppm/°C
900
-15 15 %
Differential Input Voltage
VID Figure 1
200 1600 mVp-p
Common-Mode Input Voltage
VICM PECL compatible
VCC -
1.49
VCC - VCC -
1.32 VID/4
V
Clock and Data Input Current
IIN
-1 10 µA
TTL Input High Voltage
(ENABLE, LATCH)
2.0 V
TTL Input Low Voltage
(ENABLE, LATCH)
TTL Output High Voltage FAIL
TTL Output Low Voltage FAIL
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
IMD
18 1000 µA
Monitor-Diode Bias Setpoint
Stability
Monitor-Diode Bias Absolute
Accuracy
(Note 6)
(Note 5)
IMD = 1mA
IMD = 18µA
-480
-15
50
90
480
ppm/°C
15 %
Note 1: Characteristics at -40°C guaranteed by design and characterization. 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.
2 _______________________________________________________________________________________

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
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, and TA =
+25°C.) (Note 7)
PARAMETER
Input Latch Setup Time
Input Latch Hold Time
Modulation-Current Range
Modulation-Off Current
Modulation-Current Stability
Modulation-Current Absolute
Accuracy
SYMBOL
tSU
tH
IMOD
IMOD-OFF
CONDITIONS
LATCH = high, Figure 3
LATCH = high, Figure 3
ENABLE = low (Note 4)
IMOD = 60mA
IMOD = 5mA
(Note 6)
MIN
100
100
5
-480
-15
TYP
-50
250
MAX
60
200
480
UNITS
ps
ps
mA
µA
ppm/°C
15 %
Output Rise Time
Output Fall Time
Output Aberrations
Enable/Start-Up Delay
tR 20% to 80% (Note 8)
tF 20% to 80% (Note 8)
(Note 8)
MAX3867ECM
MAX3867C/D
MAX3867ECM
MAX3867C/D
79
69
88 (Note 10)
79
±15
250
ps
ps
%
ns
Maximum Consecutive Identical
Digits
80 bits
Pulse-Width Distortion
Jitter Generation
PWD
(Notes 8, 9)
Jitter BW = 12kHz to 20MHz, 0-1 pattern
9 50 ps
7 20 psp-p
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.
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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
DATA+
DATA-
(DATA+) - (DATA-)
IOUT+
100mV MIN
800mV MAX
200mVp-p MIN
1600mVp-p MAX
IMOD
Figure 1. Required Input Signal and Output Polarity
VCC
A
A
A, B ARE SMD FERRITE BEADS
B = BLM11A601S MURATA ELECTRONICS
A = BLM21A102S MURATA ELECTRONICS
MAX3867
B
B
OUT-
OUT+
0.5pF
*
BIAS
15
0.056µF
25
0.056µF
OSCILLOSCOPE
5050
VCC
* TO COMPENSATE PACKAGE LEADS, NOT USED FOR DIE.
Figure 2. Output Termination for Characterization
CLK
DATA
tSU
tCLK = 402ps
tH
Figure 3. Setup/Hold Time Definition
4 _______________________________________________________________________________________

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+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
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, 48-TQFP)
50ps/div
TYPICAL DISTRIBUTION OF FALL TIME
60
50
48-TQFP
IMOD = 30mA
40
30
20 MEAN = 88ps
σ = 3.0ps
10
0
80 84 88 92 96 100
FALL TIME (ps)
DISTRIBUTION OF FALL TIME
(WORST-CASE CONDITIONS)
40
48-TQFP
35 IMOD = 30mA
VCC = +3.14V
30 TA = +85°C
25
20
15 MEAN = 111.6ps
10 σ = 2.9ps
5
0
106 108 110 112 114 116 118 120 122
FALL TIME (ps)
26mV
/div
120
100
80
60
40
20
0
1
ELECTRICAL EYE DIAGRAM
ELECTRICAL EYE DIAGRAM
RANDOM JITTER vs. IMOD
0.022
PATTERN = 213 - 1 + 80 CID
IMOD = 30mA
48-TQFP
55mV
/div
PATTERN = 213 - 1 + 80 CID
IMOD = 60mA
48-TQFP
0.020
0.018
0.016
0.014
50ps/div
50ps/div
0.012
JITTER BW = 12kHz to 20MHz
1-0 PATTERN
0.010
4
11 18 25 32 39 46 53 60
IMOD (mA)
IBIASMAX vs. RBIASMAX
10
RBIASMAX (k)
100
300
100
90
80
70
60
50
40
30
20
10
0
1
IMOD vs. RMODSET
10
RMODSET (kΩ)
100
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
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