MAX3905 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – 150Mbps Automotive VCSEL Driver

19-3242; Rev 0; 4/04
150Mbps Automotive VCSEL Driver
General Description
The MAX3905 150Mbps automotive VCSEL driver
implements low-cost transmitters operating from 8Mbps
to 150Mbps at junction temperatures up to +140°C. The
device accepts single-ended TTL, differential PECL or
LVDS input data, and provides bias and modulation
currents for driving a VCSEL. The output is DC-coupled
to the VCSEL to minimize component count.
The driver provides temperature compensation to
VCSEL high and low currents. Adjustments of the bias
current, modulation current, bias-current temperature
coefficient, and center of the temperature-stable bias
current region are all programmable by wirebond
options. The power-reduction feature decreases output
modulation by approximately 50%. The data squelch
feature disables the VCSEL current when no data is
present.
The MAX3905 is available in die form and operates
from -40°C to +140°C junction temperature, over a +3.0V
to +5.25V supply range.
Applications
Optical Transmitters for Automotive Networks
Polymer-Clad Silica Fiber-Based Networks
Features
♦ -40°C to +140°C Operating Junction Temperature
Range
♦ +3.0V to +5.25V Supply Voltage
♦ TTL/CMOS-, LVDS-, or PECL-Compatible Data
Input
♦ Compatible with SP1 Automotive Network
Interface
♦ Wirebond-Adjustable VCSEL Low and High
Currents
♦ Optical Power-Reduction Feature
♦ Output Squelch
Ordering Information
PART
MAX3905E/D
TEMP RANGE
-40°C to +140°C
PIN-PACKAGE
Dice*
*Dice are designed to operate from T_J = -40°C to +140°C, but
are tested and guaranteed at T_A = +49°C only.
Typical Application Circuits
+5V AUTOMOTIVE TRANSMITTER (TTL NETWORK CHIP INTERFACE, DATA RATE < 50Mbps)
V_CC = +5V
R_GAIN
V_CC
SUPPLY FILTER
GAIN
MODULATION
CONTROL DRIVER TO SET
TRANSMIT OPTICAL SUBASSEMBLY (TOSA)
TX
TTL OUTPUT
DATA
(SP1 AUTOMOTIVE
NETWORK INTERFACE)
3DB MOD1 MOD2 DT01 DT02 V_CC
IN_TTL
OUT
IN+
MAX3905
IN-
OUT
SQEN
DIFF LOW1 LOW2 TC1 TC2 TC3 VEE
VCSEL
GND
BIAS SET
Typical Application Circuits continued at end of data sheet.
BIAS
TEMPERATURE
COEFFICIENT
INDICATES OPTIONAL
WIREBOND CONNECTION
________________________________________________________________ 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.