SP8110 Advance 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 8 2 7 3 4 SP8110 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 (maximum values). The SP8110 is manufactured in 0.5/0.6 µm CMOS technology. Rev 0.1 (12-03-03): SP8110 – Two-Channel Modulation IC SIPEX RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-978-667-8700. SIPEX CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE OR COPY page 1 of 3 Advance SP8110 INPUT CHARACTERISTICS: IA/IB INPUT CURRENT VS INPUT VOLTAGE MODE SELECTION IA current > 2.65 mA < 2.5 mA > 2.65 mA < 2.5 mA IB current < 2.5 mA > 2.65 mA > 2.65 mA < 2.5 mA Mode LD_A output active LD_B output active Error Power Save PIN ASSIGNMENTS Pin No. 1 2 3 Pin Name IA IB RFreq 4 5 Vcc LD_B 6 7 GND LD_A 8 Vcc_out Function Amplitude setting for output LD_A Amplitude setting for output LD_B Modulation Frequency adjusting pin (An external resistor is connected between this pin and ground.) Power supply pin Output pin of channel B (Anode of laser diode is connected with this pin.) Ground pin Output pin of channel A (Anode of laser diode is connected with this pin.) Power supply for LD_A and LD_B outputs BOARD LAYOUT AND GROUNDING To obtain the best performance from the SP8110, a printed circuit board with ground plane is required. High quality, low series resistance ceramic 0.1uF bypass capacitors should be used at the Vcc and Vcc_out pins (pins 4 and 8). Pin 8 should also have a 0.1uF bypass capacitor. These capacitors must be located as close to the pins as possible. The traces connecting the pins and the bypassing capacitors must be kept short and should be made as wide as possible. Rev 0.1 (12-03-03): SP8110 – Two-Channel Modulation IC SIPEX RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-978-667-8700. SIPEX CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE OR COPY page 2 of 3 Advance SP8110 DFN 8-PIN PACKAGE DIMENSIONS ORDERING INFORMATION Part number SP8110ER Temperature range -40 to + 850C Package Type DFN 2 x 3 mm 8-pin Rev 0.1 (12-03-03): SP8110 – Two-Channel Modulation IC SIPEX RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-978-667-8700. SIPEX CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE OR COPY page 3 of 3