General Description
The EL6257C is a high-performance 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
• High-performance laser diode driver
• 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%)
• Current amplification = 100
• Disable feature for power-up protection and power savings
• TTL/CMOS control signals

APPLICATIONs
• DVD drives
• CD-RW applications
• Writable optical drives
• Laser diode current switching