Features: · Programmable LED Prebias Voltage
· Single +3V to +5.5V Power Supply
· Complementary Output Reduces Supply Noise
· Adjustable Modulation Current
· Adjustable Temperature Compensation
· Available in 16-Pin/24-Pin QSOP or DieApplication· Multimode LED Transmitters
· FDDI
· Fast Ethernet
· 155Mbps ATMs
· ESCON
· 266Mbps Fibre ChannelPinout
SpecificationsSupply Voltage at VCC, VCCOUT (VEE = 0V) ...............-0.5V to 7V
Current into OUT+, OUT- ..................................-40mA to 160mA
Differential Output Voltage (VOUT+ to VOUT-) ........-3.3V to 3.3V
Voltage at M1, M2, M3, PB1, PB2, PB3,
IN+, IN-, OUT+, OUT-, VBB .........................-0.5V to (VCC + 0.5V)
Voltage at TCMIN, TCNOM, TC, MOD..........................-0.5V to 2V
Continuous Power Dissipation (TA = +70°C)
16-pin QSOP (derate 8.3mW/°C above +70°C).........667mW/°C
24-pin QSOP (derate 10mW/°C above +70°C)..........770mW/°C
Operating Junction Temperature Range...........-50°C to +150°C
Die Attach Temperature..................................................+400°C
Storage Temperature Range .............................-50°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX3966 is a programmable LED driver for fiber optic transmitters operating at data rates up to 266Mbps. The circuit contains a high-speed current driver with programmable temperature coefficient (tempco), adjustments for LED prebias voltage, and a VBB reference voltage generator. The circuit accepts PECL data inputs, and operates from a single +3V to +5.5V power supply.
The MAX3966 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 MAX3966'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 MAX3966 is available in die form, or in 16-pin and 24-pin QSOP packages.
MAX3966 Data Sheet
