- Low power dissipation
- User-selectable frequency from 100MHz to 600MHz controlled with a single resistor for each laser
- User-specified amplitude from 10mAPK-PK to 100mAPK controlled with a single resistor for each output
- Auto turn-off threshold
- Soft edges for reduced EMI
- Small 8-pin LPP package
The EL6207 is a dual push-pull oscillator used to reduce laser noise. It is optimized for 350MHz operation, allowing reduced concern for harmonic EMI. It uses the standard interface to existing ROM controllers. The frequency and amplitude are each set with a separate resistor connected to ground, for each output. The tiny package and harmonic reduction allow the part to be placed close to a laser with low RF emissions.
If the voltage at both IOUT pins is less than 1.0V, the chip will be powered down and not oscillate. If the voltage at either IOUT pin is above 1.4V, the chip will be powered up and oscillating. If both IOUT pins are above 1.4V, the chip will also be powered down, and not oscillate.
The current drawn by the oscillator consists of a small utility current, plus the peak oscillator amplitude in the positive cycle, which is routed to the enabled IOUT pin. In the negative cycle the oscillator subtracts peak oscillator amplitude from the laser APC current.
The part operates from a single 5V supply, and is specified for operation from 0°C to +85°C.
- Combi drive using dual laser