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SP8110

Rev 0.1 (12-03-03): SP8110 – Two-Channel Modulation IC

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IA

IB

Rf

Vcc

Vcc-out

LD_A

GND

LD_B

SP8110

FEATURES

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5V Single supply voltage

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Two output channels, suitable for different

wavelength laser diodes

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Oscillator frequency is adjustable in both

channels simultaneously

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Oscillator amplitude is adjustable for each

output separately up to 130mA

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Operates two grounded laser diodes

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Small DFN 2 x 3mm package

APPLICATION

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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 µm CMOS technology.

Two-Channel Modulation IC for Laser Diode