MAX3967 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 270Mbps SFP LED Driver

19-3252; Rev 0; 5/04
270Mbps SFP LED Driver
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.
Features
♦ 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
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
Typical Operating Circuits appear at end of data sheet.
TOP VIEW
Pin Configuration
24 23 22 21 20 19
TCNOM 1
18 MODSET
TC 2
17 MON
PB1 3
PB2 ₄
MAX3967
16 N.C.
15 VCC
PB3 ₅
14 V_CCOUT
V_{EEOUT 6}
13 VCCOUT
7 8 9 10 11 12
THIN QFN (4mm x 4mm)
THE EXPOSED PAD MUST BE CONNECTED TO GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE
________________________________________________________________ Maxim Integrated Products 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.