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MAX3740A Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX3740A
Description  3.2Gbps SFP VCSEL Driver with Diagnostic Monitors
Download  14 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3740A Datasheet(HTML) 1 Page - Maxim Integrated Products

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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
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
VCC
REF
COMP
MD
BIAS
OUT+
OUT-
MODSET
BIASSET
RBIASSET
PWRMON
TC1
TC2
IN+
IN-
TX_DISABLE
FAULT
SQUELCH
GND
0.01µF
0.01µF
50Ω
L1*
0.047µF
+3.3V
0.1µF
0.1µF
RTC†
OPTIONAL COMPONENT
*FERRITE BEAD
PEAKSET
RPEAKSET
CF†
RF†
BIASMON
RBIASMON
4.7kΩ
RPWRSET
RMODSET
MAX3740A
19-3118; Rev 1; 6/04
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.
PART
TEMP RANGE PIN-PACKAGE
MAX3740AETG
-40°C to +85°C 24 Thin QFN (4mm x 4mm)
MAX3740AETG+
-40°C to +85°C 24 Thin QFN (4mm x 4mm)
Typical Application Circuit
+Denotes lead-free package.


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