Description
The ZL40539 is a high performance laser diode driver capable of driving two separate cathode grounded laser diodes (e.g., 650 nm and 780 nm laser diodes).
The ZL40539 contains a 150 mA low noise read channel (ChR), and three >450 mA write channels (Ch2, Ch3 and Ch4). Each channel amplifies the positive current supplied at its reference input (INR, IN2, IN3, IN4) by a fixed factor of 100, 250, 150 and 100 respectively.

FEATUREs
• Pin compatible with EL6839
• Dual output for CD/DVD laser
• LVDS control signal, internal 100 ohms
• Rise time 1.0 ns, Fall time 1.1 ns typical
• Low noise read channel with gain of 100x to 150 mA
• Channel 2 gain of 250x to 550 mA
• Channel 3 gain of 150x to 500 mA
• Channel 4 gain of 100x to 450 mA
• Combined total output current 700 mA
• On-chip oscillator with frequency and amplitude control by external resistors
• Oscillator frequency to 575 MHz, amplitude to 100 mA pk to pk
• Power Up/Down control
• > 2 kV ESD Single 5 V supply (±10%)
• 32-pin QFN package

APPLICATIONs
• DVD±RW/RAM
• DVD±R
• CD-RW
• CD-R
• Write optical drives
• Laser Diode current switch
• Supports double density DVD