The EL6204 is a push-pull oscillator used to reduce laser noise.

It uses the standard interface to existing ROM controllers. The

frequency and amplitude are each 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 it to easily be

used on combo CD-RW plus DVD-ROM pickups.

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 EL6204 part is available in the space-saving 6 Ld SOT-23

package and is specified for operation from 0°C to +70°C.

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

Applications

• DVD players

• DVD-ROM drives

• CD-RW drives

• MO drives

• General purpose laser noise reduction

• Local oscillators