4-Channel Laser Diode Driver + Oscillator

The EL6146 is a four channel laser diode current amplifier that provides controlled current to a grounded laser diode. Channels 2, 3, and 4 must be used as the write channels, with switching speeds of approximately one nanosecond rise/fall time. All four channels are summed together at the IOUT output, allowing the user to create multilevel waveforms in order to optimize laser diode performance. The level of the output current is set by an analog voltage applied to an external resistor which converts the voltage into a current at the IIN pin (virtually ground). The current seen at this pin is then amplified to become a current source at pin IOUT.

Features

? “Shrink-small” Outline Package

? Voltage-controlled output current source requiring one

external set resistor per channel

? Current-controlled output current source

? Rise time = 0.8ns

? Fall time = 0.8ns

? On chip oscillator with frequency and amplitude control by

use of external resistors to ground

? Oscillator to 500MHz

? Oscillator to 100mAPK/PK

? Single +5V supply (±10)

? Disable feature for power-up protection and power savings

? CMOS control signals

Applications

? CD-RW applications

? Writable optical drives

? Laser diode current switching