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MAX3967

Maxim
Part Number MAX3967
Manufacturer Maxim
Description 270Mbps SFP LED Driver
Published Jun 13, 2005
Detailed Description 19-3252; Rev 0; 5/04 270Mbps SFP LED Driver MAX3967 General Description The MAX3967 is a programmable LED driver for fi...
Datasheet PDF File MAX3967 PDF File

MAX3967
MAX3967

Overview
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 driver with programmable temperature coefficient (tempco), 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 programmed 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 constant 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 TA = +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 VEE TX_DISABLE Pin Configuration 24 23 22 21 20 19 18 17 16 MODSET MON N.
C.
VCC VCCOUT VCCOUT MAX3967 4 5 6 7 VEEOUT 8 OUT+ 9 OUT+ 10 OUT11 OUT12 N.
C.
15 14 13 Typical Operating Circuits appear at end of data sheet.
PB3 VEEOUT THIN QFN (4mm x 4mm) THE EXPOSED PAD MUST BE CONNECT...


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