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MAX3967

Description
270Mbps SFP LED Driver
File Size319KB,14 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX3967 Overview

270Mbps SFP LED Driver

19-3252; Rev 0; 5/04
270Mbps SFP LED Driver
MAX3967
General Description
The MAX3967 is a programmable LED driver for fiber
optic transmitters operating at data rates up to
270Mbps. The circuit contains a high-speed current dri-
ver with programmable temperature coefficient (temp-
co), adjustments for LED prebias voltage, and a disable
feature. The circuit accepts PECL data inputs, and
operates from a single +2.97V to +5.5V power supply.
The SFP LED driver can switch up to 100mA into typical
high-speed light-emitting diodes. As temperature
increases, the device’s modulation current increases
with a tempco that is programmable from 2500ppm/°C
to 12,000ppm/°C. The modulation current is pro-
grammed with a single external resistor.
The MAX3967’s LED prebias voltage is programmable
from 400mV to 925mV. The prebias circuit produces
peaking current, which improves the LED switching
speed.
Complementary current outputs help to maintain a con-
stant supply current, reducing EMI and supply noise
generated by the transmitter module. The MAX3967 is
available in die form, or in a 4mm x 4mm, 24-pin thin
QFN package.
TX_DISABLE for SFP Compatibility
Single +2.97V to +5.5V Power Supply
Adjustable Temperature Compensation
Adjustable Modulation Current
Complementary Output Reduces Supply Noise
Programmable LED Prebias Voltage
Available in 24-Pin QFN or Die
Features
Ordering Information
PART
MAX3967ETG
MAX3967E/D
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 Thin QFN
Dice*
*Dice
are tested and guaranteed only at T
A
= +25°C.
Applications
Multimode LED Transmitters
Fast Ethernet/FDDI
155Mbps LAN ATM Transceivers
ESCON Receivers
SFP Transceivers
TCNOM
TC
PB1
PB2
1
2
3
TOP VIEW
TCMIN
V
EE
TX_DISABLE
Pin Configuration
24
23
22
21
20
19
18
17
16
MODSET
MON
N.C.
V
CC
V
CCOUT
V
CCOUT
MAX3967
4
5
6
7
V
EEOUT
8
OUT+
9
OUT+
10
OUT-
11
OUT-
12
N.C.
15
14
13
Typical Operating Circuits appear at end of data sheet.
PB3
V
EEOUT
THIN QFN (4mm x 4mm)
THE EXPOSED PAD MUST BE CONNECTED TO GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE
________________________________________________________________
Maxim Integrated Products
V
CC
IN+
IN-
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.

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