DATASHEET
EL6204 FN7219
Rev 3.00
October 28, 2015 Laser Driver Oscillator
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. Features 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. Auto turn-off threshold 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 0В°C to +70В°C. 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 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 IOUT 1 VDD 2 GND1 3 DRIVER OSCILLATOR REFERENCE AND
BIAS AUTO SHUT-OFF 6 RFREQ 5 GND2 4 RAMP FIGURE 1. BLOCK DIAGRAM FN7219 Rev 3.00
October 28, 2015 Page 1 of 12 EL6204
TYPICAL …