General Description

The EL6259C is a low noise four channel laser diode current amplifier that provides controlled current to a grounded laser diode. The four amplifiers can provide up to 150 mA per channel of DC or pulsed current. 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.

Features

• Low output noise = 4.0nA/rt-Hz

• High-performance laser diode driver

• Pin compatible with EL6257

• Voltage-controlled output current source to 150 mA per channel, requiring one external set resistor per channel

• Current-controlled output current source to 150 mA per channel

• Rise time = 1.0 ns

• Fall time = 1.1 ns

• On chip oscillator with frequency and amplitude control by use of external resistors to ground

• Oscillator to 500 MHz

• Oscillator to 100 mA pk/pk

• Single +5V supply (±10)

• Disable feature for power-up protection and power savings

• TTL/CMOS control signals

Applications

• DVD-RAM high speed drives

• CD-RW applications

• Writable optical drives

• Laser diode current switching