Overview

Features and Benefits

  • 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 negative logic
  • Independent TTL oscillator enables positive logic
  • 170 mA minimum output current for the read channel
  • 510 mA minimum output current for Write
    Channel 1
  • 330 mA minimum output current for Write
    Channel 2
  • 165 mA minimum output current for Write
    Channel 3
  • 950 mA typical total output current
  • Typical rise time/fall time of  0.8 ns
  • Low power consumption
  • Single 5 V power supply (±10%)

Product Details

The AD9665 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 WxDIS and RDIS pins are active low logic. The OSCEN pin is controlled by an active high TTL signal. All active channels are summed at the output where Write Channel 1 can contribute at least 325 mA output current, and Write Channel 2 and Write Channel 3 can contribute at least 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 WxSET pin.

An on-chip oscillator is provided to allow output current modulation and to reduce laser-mode hopping. Four external resistors permit the setting of two distinct values for the frequency and swing of the oscillator. The oscillator can output up to 100 mA p-p of current (push-pull oscillator) with a frequency range of 200 MHz to 500 MHz.

APPLICATIONS

  • DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM supercombo drives
  • Magneto-optical (MO) drives
  • Laser diode current switching
  • OTDR laser drivers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy


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