EL6833

Features:

• Two channels for CD or DVD
• Voltage-controlled output current source requiring one external set resistor per channel
• Rise time = 0.8ns
• Fall time = 0.8ns
• DVD - Channel 2 to 240mA max
• DVD - Channel 3 to 170mA max
• DVD - Channel 4 to 100mA max
• CD - Channel 2 to 350mA max
• CD - Channel 3 to 250mA max
• On chip oscillator with frequency and amplitude control by use of external resistors to ground
• Oscillator frequency to 600MHz
• Oscillator amplitude to 100mAP-P
• Single +5V supply (±10%)
• Chip ENAs for power savings
• External LVDS termination
• Pb-free available




Application

• Super combo drives


Description

   The EL6833 is a high performance, dual output, laser driver for writeable 'super-combo' CD - DVD drives. The ENA pin enables the chip, while the SEL1 pin selects the
IOUT pin. Various waveforms can be generated where the amplitude is determined by the currents flowing into I_INR, I_IN2, I_IN3, and I_IN4. The timing is determined by the signals at WEN2-WEN2B, WEN3-WEN3B, and WEN4-WEN4B. The oscillator is enabled when OSEN-OSENB is high. The amplified IINR current of the selected channel is enabled when the ENA pin is high. The total output current is the sum of the read current, the enabled write currents, and the oscillator current when enabled.

   Usually a voltage DAC will drive a resistor EL6833 that is in series with the I_INR, I_IN2, I_IN3 and I_IN4 input. The resistor allows the user to optimize the current gain for each channel.

   Output write current pulses are enabled when a high is applied to the WEN2-WEN2B, WEN3-WEN3B, or WENWEN4B pin. The write current will flow to the selected output. When SEL1 is high I_OUT1 is selected. WENRB enables read and oscillator current when low.

   The EL6833 RF oscillators frequency is determined by R_FREQ1 or R_FREQ2, and its amplitude by R_AMP1 or R_AMP2.