MAX3646 Maxim Integrated Products, MAX3646 Datasheet
MAX3646
Manufacturer Part Number
MAX3646
Description
155Mbps to 622Mbps Sff/sfp Laser Driver
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX3646.pdf
(14 pages)
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The MAX3646 is a +3.3V laser driver designed for mul-
tirate transceiver modules with data rates from
155Mbps to 622Mbps. Lasers can be DC-coupled to
the MAX3646 for reduced component count and ease
of multirate operation.
Laser extinction ratio control (ERC) combines the features
of automatic power control (APC), modulation compensa-
tion, and built-in thermal compensation. The APC loop
maintains constant average optical power. Modulation
compensation increases the modulation current in pro-
portion to the bias current. These control loops, com-
bined with thermal compensation, maintain a constant
optical extinction ratio over temperature and lifetime.
The MAX3646 accepts differential data input signals.
The wide 5mA to 60mA (up to 85mA AC-coupled) mod-
ulation current range and up to 100mA bias current
range, make the MAX3646 ideal for driving FP/DFB
lasers in fiber optic modules. External resistors set the
required laser current levels. The MAX3646 provides
transmit disable control (TX_DISABLE), single-point
fault tolerance, bias-current monitoring, and photocur-
rent monitoring. The device also offers a latched failure
output (TX_FAULT) to indicate faults, such as when the
APC loop is no longer able to maintain the average
optical power at the required level. The MAX3646 is
compliant with the SFF-8472 transmitter diagnostic and
SFP MSA timing requirements.
The MAX3646 is offered in a 4mm x 4mm, 24-pin thin
QFN package and operates over the extended -40°C to
+85°C temperature range.
19-3161; Rev 1; 7/04
Typical Application Circuit appears at end of data sheet.
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.
Multirate OC-3 to OC-12 FEC Transceivers
125Mbps Ethernet SFP, GBIC, and 1 x 9
Transceivers
Laser Driver with Extinction Ratio Control
________________________________________________________________ Maxim Integrated Products
General Description
Applications
155Mbps to 622Mbps SFF/SFP
+Denotes lead-free package.
MAX3646ETG
MAX3646ETG+
Single +3.3V Power Supply
47mA Power-Supply Current
85mA Modulation Current
100mA Bias Current
Automatic Power Control (APC)
Modulation Compensation
On-Chip Temperature Compensation
Self-Biased Inputs for AC-Coupling
Ground-Referenced Current Monitors
Laser Shutdown and Alarm Outputs
Enable Control and Laser Safety Feature
PART
THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY
GROUND ON THE CIRCUIT BOARD.
TOP VIEW
MODTCOMP
TX_DISABLE
V
V
IN+
IN-
CC
CC
-40°C to +85°C
-40°C to +85°C
1
2
3
4
5
6
RANGE
24
TEMP
7
Ordering Information
23
8
MAX3646
22
9
Pin Configuration
21
10
PIN-
PACKAGE
24 Thin QFN
24 Thin QFN
20
11
19
12
18
17
16
15
14
13
Features
MD
V
OUT+
OUT-
V
BIAS
CC
CC
PKG
CODE
T2444-1
T2444-1
1
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