GENERAL DESCRIPTION

The AD9664 is a laser diode driver for high performance CD-RW and DVD recordable drives. It includes four channels for four different optical power levels: the Read Channel generates a continuous output power level, whereas Channel 1, Channel 2, and Channel 3 can be used as write channels that can be controlled with an LVDS or TTL interface. The OSCEN pin is controlled by a TTL signal. All channels are summed at the selected LD output pin where Write Channel 1 can contribute a minimum 325 mA maximum output current, and Write Channel 2 and Write Channel 3 can contribute a minimum of 250 mA and 150 mA, respectively. The level of the output current is set by an external resistor, which converts this voltage into a current at the xSET pin.

FEATURES

  Dual-current controlled output current sources with 4 input channels

  TTL selectable output

  Stable on-chip oscillators with independent frequency and amplitude control

  TTL or LVDS selectable write channel enables

  Independent TTL oscillator enable

  150 mA minimum output current for Read Channel

  325 mA minimum output current for Write Channel 1

  250 mA minimum output current for Write Channel 2

  150 mA minimum output current for Write Channel 3

  Rise time/fall time of ≤0.8 ns

  Low output overshoot

  Low power consumption

  Single 5 V power supply (±10%)

APPLICATIONS

  DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM supercombo drives

  MO drives

  Laser diode current switching