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PDF MAX3865EGJ Data sheet ( Hoja de datos )
| Número de pieza | MAX3865EGJ | |
| Descripción | 2.5Gbps Laser Driver with Automatic Modulation Control | |
| Fabricantes | Maxim Integrated | |
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19-2247; Rev 1; 4/02
2.5Gbps Laser Driver with Automatic
Modulation Control
General Description
The MAX3865 is designed for direct modulation of laser
diodes at data rates up to 2.5Gbps. It incorporates two
feedback loops, the automatic power-control (APC)
loop and the automatic modulation-control (AMC) loop,
to maintain constant average optical output and extinc-
tion ratio over temperature and laser lifetime. External
resistors or current output DACs may set the laser out-
put levels. The driver can deliver up to100mA of laser
bias current and up to 60mA laser modulation current
with a typical (20% to 80%) edge speed of 84ps.
The MAX3865 accepts differential clock and data input
signals with on-chip 50Ω termination resistors. The inputs
can be configured for CML or other high-speed logic. An
input data-retiming latch can be enabled to reject input
pattern-dependent jitter when a clock signal is available.
The MAX3865 provides laser bias current and modulation
current monitors, as well as a failure detector, to indicate
the laser operating status. These features are all imple-
mented on an 81mil ✕ 103mil die; the MAX3865 is also
available as a 32-pin QFN package.
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 68mA Supply Current
o Up to 2.5Gbps (NRZ) Operation
o Feedback Control for Constant Average Power
o Feedback Control for Constant Extinction Ratio
o Programmable Bias Current Up to 100mA
o Programmable Modulation Current Up to 60mA
o 84ps Rise/Fall Time
o Selectable Data Retiming Latch
o Bias and Modulation Current Monitors
o Failure Detector
o ESD Protection
Ordering Information
PART
MAX3865EGJ
MAX3865E/D
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 QFN
Dice*
*Dice are designed to operate from -40°C to +85°C , but are tested
and guaranteed at TA = +25°C only. Contact factory for availability.
Pin Configuration appears at end of data sheet.
Typical Applications Circuit
DATA-
DATA+
MAX3892
2.5Gbps SERIALIZER
CLK+
CLK-
+3.3V
50Ω
50Ω
+3.3V
50Ω
50Ω
DATA-
DATA+
VDR
VCR
CLK+
CLK-
+3.3V
200Ω
200Ω
MAX3865
+3.3V
LED
LP
MODN
MODQ
BIAS
BIAS_X
MD
MD_X
LP
20Ω
20Ω
20Ω
0.056µF
15Ω
0.056µF
LASER
RMODMAX
RBIASMAX
RAPCSET
RAMCSET
REPRESENTS A CONTROLLED-IMPEDANCE
TRANSMISSION LINE
†Covered by U.S. Patent numbers 5,883,910, 5,850,409, and other patent pending.
________________________________________________________________ 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.
1 page  
2.5Gbps Laser Driver with Automatic
Modulation Control
(TA = +25°C, unless otherwise noted.)
OPTICAL EYE DIAGRAM
(EXTINCTION RATIO = 8.25dB,
213-1 PRBS AT 2.5Gbps, 1.87GHz FILTER)
Typical Operating Characteristics
ELECTRICAL EYE DIAGRAM
(IMODQ = 60mA)
ELECTRICAL EYE DIAGRAM
(IMODQ = 30mA)
PATTERN 213 - 1 PRBS
DATA RATE = 2.5Gbps
PATTERN 213 - 1 PRBS
DATA RATE = 2.5Gbps
58ps/div
58ps/div
58ps/div
SUPPLY CURRENT (ICC) vs. TEMPERATURE
(EXCLUDES BIAS AND MODULATION CURRENTS)
80
75
70 VCC = +5.0V
VCC = +3.3V
65
60
55
50
-40
-15 10 35 60
TEMPERATURE (°C)
85
DETERMINISTIC JITTER
vs. TEMPERATURE (IMODQ = 60mA)
100
90
80
70
60
50
40
30
20
10
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
TYPICAL DISTRIBUTION OF RISE TIME
(WORST-CASE CONDITIONS)
30
ELECTRICAL
MEASUREMENT
25 IMODQ = 60mA
VCC = +3.14V
20 TA = +85°C
15
10
5
0
100 102 104 106 108 110 112 114 116 118 120
RISE TIME (ps)
TYPICAL DISTRIBUTION OF FALL TIME
(WORST-CASE CONDITIONS)
30
ELECTRICAL
MEASUREMENT
25 IMODQ = 60mA
VCC = +3.14V
20 TA = +85°C
15
10
5
0
100 102 104 106 108 110 112 114 116 118 120
FALL TIME (ps)
DIFFERENTIAL |S11| vs. FREQUENCY
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
0
500 1000 1500 2000 2500 3000 3500 4000
FREQUENCY (MHz)
_______________________________________________________________________________________ 5
5 Page 
RTEN
DATA
CLK
EN0
EN1
FAIL
2.5Gbps Laser Driver with Automatic
Modulation Control
VCC
D
Q
CONTROL LOGIC
SHUTDOWN
LOOP
MONITOR
OVERCURRENT
VBG
o
MUX
1
x5 x5
VBG
MONITOR DIODE
FEEDBACK
MODULATION
CONTROL
BIAS
CONTROL
-∑
+
x320
MODN
MODQ
BIAS
MD
20Ω
IMODO
CD RD
IBIAS
IMD
-∑
+
x480
MAX3865
VBG
VBG
RAMCSET
RAPCSET
RMODMAX
RBIASMAX
Figure 4. Functional Diagram
VDR
VCC
DATA+
50Ω 50Ω
VCC
MODQ
MODN
GND
DATA-
DATA AND CLOCK INPUT CIRCUITS ARE EQUIVALENT GND
Figure 5. Equivalent Input Circuit
IMOD
GND
Figure 6. Equivalent Modulation Output Circuit
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX3865EGJ.PDF ] | |
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