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VCSEL Driver. MAX3740A Datasheet

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VCSEL Driver. MAX3740A Datasheet






MAX3740A Driver. Datasheet pdf. Equivalent




MAX3740A Driver. Datasheet pdf. Equivalent





Part

MAX3740A

Description

SFP VCSEL Driver



Feature


www.DataSheet4U.com 19-3118; Rev 1; 6/04 3.2Gbps SFP VCSEL Driver with Diagnos tic Monitors General Description The MA X3740A is a high-speed VCSEL driver for smallform-factor (SFF) and small-form- factor pluggable (SFP) fiber optic LAN transmitters. It contains a bias genera tor, a laser modulator, and comprehensi ve safety features. The automatic power control (APC) adj.
Manufacture

Maxim Integrated Products

Datasheet
Download MAX3740A Datasheet


Maxim Integrated Products MAX3740A

MAX3740A; usts the laser bias current to maintain average optical power over changes in t emperature and laser properties. The dr iver accommodates common cathode and di fferential configurations. The MAX3740A operates up to 3.2Gbps. It can switch up to 15mA of laser modulation current and source up to 15mA of bias current. Adjustable temperature compensation is provided to keep t.


Maxim Integrated Products MAX3740A

he optical extinction ratio within speci fications over the operating temperatur e range. The MAX3740A interfaces with t he Dallas DS1858 to meet SFF-8472 timin g and diagnostic requirements. The MAX3 740A accommodates various VCSEL package s, including low-cost TO-46 headers. Th e MAX3740A safety circuit detects fault s that could cause hazardous light leve ls and disables th.


Maxim Integrated Products MAX3740A

e VCSEL output. The safety circuits are compliant with SFF and SFP multisource agreements (MSA). The MAX3740A is avail able in a compact 4mm ✕ 4mm, 24-pin t hin QFN package and operates over the - 40°C to +85°C temperature range. ♦ 2mA to 15mA Modulation Current ♦ 1mA to 15mA Bias Current ♦ Optional Peaki ng Current to Improve VCSEL Edge Speed ♦ Supports Common Cathode an.

Part

MAX3740A

Description

SFP VCSEL Driver



Feature


www.DataSheet4U.com 19-3118; Rev 1; 6/04 3.2Gbps SFP VCSEL Driver with Diagnos tic Monitors General Description The MA X3740A is a high-speed VCSEL driver for smallform-factor (SFF) and small-form- factor pluggable (SFP) fiber optic LAN transmitters. It contains a bias genera tor, a laser modulator, and comprehensi ve safety features. The automatic power control (APC) adj.
Manufacture

Maxim Integrated Products

Datasheet
Download MAX3740A Datasheet




 MAX3740A
19-3118; Rev 3; 1/10
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
General Description
The MAX3740A is a high-speed VCSEL driver for small-
form-factor (SFF) and small-form-factor pluggable (SFP)
fiber optic LAN transmitters. It contains a bias genera-
tor, a laser modulator, and comprehensive safety fea-
tures. The automatic power control (APC) adjusts the
laser bias current to maintain average optical power
over changes in temperature and laser properties. The
driver accommodates common cathode and differential
configurations.
The MAX3740A operates up to 3.2Gbps. It can switch
up to 15mA of laser modulation current and source up
to 15mA of bias current. Adjustable temperature com-
pensation is provided to keep the optical extinction
ratio within specifications over the operating tempera-
ture range. The MAX3740A interfaces with the Dallas
DS1858 to meet SFF-8472 timing and diagnostic
requirements. The MAX3740A accommodates various
VCSEL packages, including low-cost TO-46 headers.
The MAX3740A safety circuit detects faults that could
cause hazardous light levels and disables the VCSEL
output. The safety circuits are compliant with SFF and
SFP multisource agreements (MSA).
The MAX3740A is available in a compact 4mm 4mm,
24-pin thin QFN package and operates over the -40°C
to +85°C temperature range.
Applications
Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules
Gigabit Ethernet Optical Transmitters
Fibre Channel Optical Transmitters
Infiniband Optical Transmitters
Features
Supports all SFF-8472 Digital Diagnostics
2mA to 15mA Modulation Current
1mA to 15mA Bias Current
Optional Peaking Current to Improve VCSEL Edge
Speed
Supports Common Cathode and Differential
Configuration
Automatic Power Control
Safety Circuits Compliant with SFF and SFP
MSAs
4mm 4mm, 24-Pin Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3740AETG
-40°C to +85°C 24 Thin QFN-EP*
MAX3740AETG+ -40°C to +85°C 24 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit
+3.3V
TX_DISABLE
SQUELCH
VCC
FAULT
PWRMON
MODSET
4.7kΩ
RMODSET
0.1μF
IN+
MAX3740A
REF
COMP
0.1μF
RTC†
IN-
TC1
MD
BIAS
0.047μF
RBIASSET
TC2
BIASSET
GND PEAKSET
0.01μF
OUT+
OUT-
BIASMON 0.01μF
50Ω
RPEAKSET
RBIASMON
RPWRSET
L1*
CF†
RF†
OPTIONAL COMPONENT
*FERRITE BEAD
________________________________________________________________ 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.




 MAX3740A
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ..............................................-0.5V to 6.0V
Voltage at TX_DISABLE, IN+, IN-, FAULT,
SQUELCH, TC1, TC2, MODSET, PEAKSET, BIASSET,
BIAS, BIASMON, COMP, MD, REF,
PWRMON ...............................................-0.5V to (VCC + 0.5V)
Voltage at OUT+, OUT- .........................(VCC - 2V) to (VCC + 2V)
Current into FAULT ............................................ -1mA to +25mA
Current into OUT+, OUT- ....................................................60mA
Continuous Power Dissipation (TA = +85°C)
24-Lead Thin QFN
(derate 20.8mW/°C above +85°C).................................1354mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°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.
ELECTRICAL CHARACTERISTICS
(VCC = +2.97V to +3.63V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, TC1 and TC2 are shorted, PEAKSET open, TA =
+25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Current
FAULT OUTPUT
Output High Voltage
Output Low Voltage
TX_DISABLE INPUT
Input Impedance
Input High Voltage
Input Low Voltage
Power-Down Time
SQUELCH
Squelch Threshold
Squelch Hysteresis
Time to Squelch Data
Time to Resume from Squelch
BIAS GENERATOR (Note 4)
Bias Current
Accuracy of Programmed Bias
Current
ICC
ICC-SHDN
SQUELCH set low,
TX_DISABLE set low,
peaking is not used
(Note 1)
IMOD = 2mAP-P
IMOD = 15mAP-P
Additional current when peaking is used
(Note 2)
Additional current when SQUELCH is high
Total current when TX_DISABLE is high
VOH
VOL
RLOAD = 10kΩ to 2.97V
RLOAD = 4.7kΩ to 3.63V
VIH
VIL
The time for ICC to reach ICC-SHDN when
TX_DISABLE transitions high
(Note 3)
(Note 3)
IBIAS
ΔBIAS
Minimum
Maximum
5mA IBIAS 15mA
1mA IBIAS 5mA
32
55 68
mA
15 20
5 10
3.9 5
2.4 V
0.4 V
4.7 10.0 kΩ
2.0 V
0.8 V
50 µs
25
10
0.02
0.02
15
-8
-12
85
5.00
5.00
mVP-P
mVP-P
µs
µs
1
mA
+8
%
+12
2 _______________________________________________________________________________________




 MAX3740A
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.97V to +3.63V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, TC1 and TC2 are shorted, PEAKSET open, TA =
+25°C, unless otherwise noted.)
PARAMETER
Bias Current During Fault
SYMBOL
IBIAS_OFF
BIASMON Gain
BIASMON Stability
AUTOMATIC POWER CONTROL (APC)
CONDITIONS
Current out of the BIAS pin
1mA < IBIAS < 3mA
3mA IBIAS 15mA
(Notes 5,6)
MD Nominal Voltage
VMD APC loop is closed
Voltage at REF
MD Voltage During Fault
MD Input Current
APC Time Constant
PWRMON Nominal Gain
LASER MODULATOR (Note 7)
Data Input Voltage Swing
Output Resistance
Modulation Current
Minimum Peaking Current Range
Maximum Peaking Current Range
Peaking Current Duration
VREF
Normal operation (FAULT = low)
CCOMP = 0.047µF (Note 6)
VPWRMON / (VREF - VMD)
VID
IMOD
Minimum
Maximum
Single-ended resistance at OUT+
Single-ended resistance at OUT-
Minimum
Maximum
MIN
0.0875
0.085
-10
TYP
1.5
0.105
0.105
MAX
10
0.1375
0.125
+10
UNITS
µA
mA/mA
%
1
1.2
-2
5
1.85
VREF -
0.16
1.8
0
0.7
20
2.15
2
2.2
+2
2.45
V
V
V
µA
µs
V/V
2200
80
72
15
0.2
2
80
250
mVP-P
105
Ω
100
2
mAP-P
mA
mA
ps
Tolerance of Programmed
Modulation Current
TC1 is shorted to TC2
-10 +10 %
Minimum Programmable
Temperature Coefficient
0 ppm/°C
Maximum Programmable
Temperature Coefficient
Modulation Transition Time
Deterministic Jitter
Random Jitter
Laser Modulation During Fault or
while Squelch is Active
Input Resistance
Temperature range 0°C to +70°C
tR, tF
DJ
RJ
5mA IMOD 15mA, 20% to 80% (Note 6)
5mA IMOD 15mA, 3.2Gbps (Notes 6, 8)
(Note 6)
IMOD_OFF
Differential resistance
+5000
ppm/°C
65 95
ps
12 20 psP-P
1.3 4 psRMS
15 50 µAP-P
85 100 115
Ω
Input Bias Voltage
VIN
VCC -
0.3
V
_______________________________________________________________________________________ 3






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