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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 (maximum values).
The SP8110 is manufactured in 0.5/0.6 碌m CMOS technology.
Rev 0.1 (12-03-03): SP8110 鈥?Two-Channel Modulation IC
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