EL6836

The EL6836 is a high performance, dual output, laser driver for writeable DVD drives. The ENA pin enables the chip, while the SEL1 pin selects the I_OUT  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 WEN2B, WEN3B, and WEN4B. The oscillator is enabled when OSEN is high. The amplified I_INR  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 EL6836 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. WEN2B, WEN3B, and WEN4B are CMOS input pins with a 1.68V threshold. Output write current pulses are enabled when a low is applied to the WEN2B, WEN3B, or WEN4B 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 EL6836 R_F   oscillators frequency is determined by R_FREQ1  or R_FREQ2 , and its amplitude by R _AMP1  or R _AMP2 .