SP8110

Advance SP8110 Two-Channel Modulation IC for Laser Diode FEATURES 5V Single supply voltage Two output channels, suitable for different wavelength laser diodes Oscillator frequency is adjustable in both channels simultaneously Oscillator amplitude is adjustable for each output separately up to 130mA Operates two grounded laser diodes Small DFN 2 x 3mm package IA IB Rf Vcc 1 2 3 4 SP8110 8 7 6 5 Vcc-out LD_A GND LD_B APPLICATION DVD-ROM or DVD-Video applications utilizing twin laser diodes GENERAL DESCRIPTION The SP8110 is a Two-Channel Modulation IC utilizing high frequency current to suppress the noise of grounded laser diodes. Modulation frequency is adjusted in both channels simultaneously by an external resistor Rf tied to the ground. The amplitude of the high frequency current is set for each channel separately by a DC input current applied to the appropriate input pin (IA or IB for Laser A or Laser B, respectively). Current gain from input to output is 100mA/mA (typical). The input current at pins IA and IB is monitored to determine which channel is active. In the event input current in both channels is below the active threshold level (approximately 2.65mA), the SP8110 will enter Power Save mode. In the event a valid input current above the active threshold level is present on both inputs, an Error mode is assumed and the outputs of both channels are disabled. Supply current levels in Power Save and Error modes are below 0.2 and 0.8 mA respectively...