MAX3740AETG+T Maxim Integrated Products, MAX3740AETG+T Datasheet

IC DRIVER SFP VCSEL 24-TQFN

MAX3740AETG+T

Manufacturer Part Number
MAX3740AETG+T
Description
IC DRIVER SFP VCSEL 24-TQFN
Manufacturer
Maxim Integrated Products
Type
Laser Diode Driverr
Datasheet

Specifications of MAX3740AETG+T

Data Rate
3.2Gbps
Number Of Channels
1
Voltage - Supply
2.97 V ~ 3.63 V
Current - Supply
55mA
Current - Modulation
15mA
Current - Bias
15mA
Operating Temperature
-40°C ~ 85°C
Package / Case
24-TQFN Exposed Pad
Mounting Type
Surface Mount
Supply Voltage (max)
6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Supply Current
55 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
24-pin thin QFN package and operates over the -40°C
to +85°C temperature range.
19-3118; Rev 3; 1/10
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.
Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules
Gigabit Ethernet Optical Transmitters
Fibre Channel Optical Transmitters
Infiniband Optical Transmitters
3.2Gbps SFP VCSEL Driver with Diagnostic
________________________________________________________________ Maxim Integrated Products
General Description
Applications
4mm,
♦ Supports all SFF-8472 Digital Diagnostics
♦ 2mA to 15mA Modulation Current
♦ 1mA to 15mA Bias Current
♦ Optional Peaking Current to Improve VCSEL Edge
♦ Supports Common Cathode and Differential
♦ Automatic Power Control
♦ Safety Circuits Compliant with SFF and SFP
♦ 4mm
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX3740AETG
MAX3740AETG+
Speed
Configuration
MSAs
R
BIASSET
R
PART
TC
*FERRITE BEAD
0.1μF
OPTIONAL COMPONENT
0.1μF
4mm, 24-Pin Thin QFN Package
TX_DISABLE
SQUELCH
IN+
IN-
TC1
TC2
BIASSET
GND
Typical Application Circuit
PEAKSET
MAX3740A
R
PEAKSET
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
+3.3V
V
Ordering Information
CC
BIASMON
PWRMON
MODSET
FAULT
COMP
OUT+
OUT-
BIAS
REF
MD
R
BIASMON
0.01μF
0.01μF
4.7kΩ
0.047μF
R
MODSET
Monitors
50Ω
PIN-PACKAGE
24 Thin QFN-EP*
24 Thin QFN-EP*
C
R
F
F
Features
R
PWRSET
L1*
1

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MAX3740AETG+T Summary of contents

Page 1

... Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules Gigabit Ethernet Optical Transmitters Fibre Channel Optical Transmitters Infiniband Optical Transmitters ________________________________________________________________ Maxim Integrated Products 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. ♦ Supports all SFF-8472 Digital Diagnostics ♦ ...

Page 2

SFP VCSEL Driver with Diagnostic Monitors ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) ..............................................-0.5V to 6.0V CC Voltage at TX_DISABLE, IN+, IN-, FAULT, SQUELCH, TC1, TC2, MODSET, PEAKSET, BIASSET, BIAS, BIASMON, COMP, MD, REF, PWRMON ...............................................-0. Voltage ...

Page 3

SFP VCSEL Driver with Diagnostic ELECTRICAL CHARACTERISTICS (continued +2.97V to +3.63V -40°C to +85°C. Typical values are +25°C, unless otherwise noted.) PARAMETER SYMBOL Bias Current During Fault I BIAS_OFF BIASMON Gain ...

Page 4

SFP VCSEL Driver with Diagnostic Monitors ELECTRICAL CHARACTERISTICS (continued +2.97V to +3.63V -40°C to +85°C. Typical values are +25°C, unless otherwise noted.) PARAMETER SYMBOL SAFETY FEATURES (see the Typical Operating Characteristics ...

Page 5

SFP VCSEL Driver with Diagnostic (V = +3.3V 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT noted.) ELECTRICAL EYE MAX3740A toc01 3.2Gbps, K28.5, 10mA MODULATION, PEAKING OFF 73mV/div 50ps/div OPTICAL ...

Page 6

SFP VCSEL Driver with Diagnostic Monitors (V = +3.3V 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT noted.) BIAS CURRENT vs. R BIASSET 100m 10m 1m 100μ 1k 10k R ...

Page 7

SFP VCSEL Driver with Diagnostic (V = +3.3V 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT noted.) HOT PLUG WITH TX_DISABLE LOW MAX3740A toc19 3. FAULT LOW ...

Page 8

SFP VCSEL Driver with Diagnostic Monitors PIN NAME 1, 10, 13 GND Ground Transmit Disable. Driver output is disabled when TX_DISABLE is high or left unconnected. The 2 TX_DISABLE driver output is enabled when the pin is asserted low. ...

Page 9

SFP VCSEL Driver with Diagnostic REF 1.8V R PWRSET MD SMOOTH- START COMP Figure 1. Bias Generator Detailed Description The MAX3740A contains a bias generator with automat- ic power control (APC), safety circuit, and a laser ...

Page 10

SFP VCSEL Driver with Diagnostic Monitors Table 2. Circuit Response to Various Single-Point Faults (Closed-Loop APC Configuration) PIN NAME CIRCUIT RESPONSE TO V FAULT Does not affect laser power. TX_DISABLE Modulation and bias current are disabled. IN+ Does not ...

Page 11

SFP VCSEL Driver with Diagnostic TX_DISABLE BIAS V - 0.2V CC BIASMON 0.8V PWRMON 0.8V TX_DISABLE Figure 2. Safety Circuit MAX3740A INPUT BUFFER IN+ 100Ω IN- SQUELCH TEMPERATURE COMPENSATION TC1 R Figure 3. Modulation Circuit ______________________________________________________________________________________ V FAULT BIAS ...

Page 12

SFP VCSEL Driver with Diagnostic Monitors Programming Modulation Current The modulation current output of the MAX3740A is con- trolled by a resistor (R MODSET MODSET and ground. The R MODSET the amount of current being sourced to the VCSEL. ...

Page 13

SFP VCSEL Driver with Diagnostic OUT- OUT+ Figure 5. Simplified Output Structure V CC MAX3740A Figure 6. Fault Circuit Interface Applications Information Interface Models Figures 4 and 5 show simplified input and output circuits for ...

Page 14

SFP VCSEL Driver with Diagnostic Monitors TX_DISABLE SQUELCH IN+ 100Ω IN- Chip Information TRANSISTOR COUNT: 3806 PROCESS: SiGe BIPOLAR Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2010 Maxim Integrated Products DESCRIPTION - 0 ...

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