EL6208
Dual Push-Pull Laser Driver Oscillator
Typical Diagram
Key Features
- Low power dissipation
- User-selectable frequency from 60MHz to 600MHz controlled with a single resistor
- User-specified amplitude from 10mAP-P to 100mAP-P controlled with a single resistor
- Auto turn-off threshold
- Soft edges for reduced EMI
- Small 6 Ld SOT-23 package
- Pb-free available (RoHS compliant)
Description
The EL6208 is a dual push-pull oscillator used to reduce laser noise in twin laser diodes. It uses the standard interface to existing ROM controllers. The frequency and amplitude are both set with a separate resistor connected to ground. The tiny package and harmonic reduction allow the part to be placed close to a laser with low RF emissions. An auto turn-off feature allows activates the oscillator only when the APC current is applied.
If the APC current is reduced such that the average laser voltage drops to less than 1.1V, the output and oscillator are disabled, reducing power consumption to a minimum.
The current drawn by the oscillator consists of a small utility current, plus the peak output amplitude in the positive cycle. In the negative cycle the oscillator subtracts peak output amplitude from the laser APC current. The waveform is filtered to reduce EMI emissions.
The EL6208 operates from a signal +5V supply. Power consumption is very low. The EL6208 part is available in the space-saving 6 Ld SOT-23 package and is specified for operation from 0°C to +70°C.
Applications
- CD-DVD ROM drives
