General Description

The EL6201C is a solid state high performance laser modulation oscillator with external resistor adjustable frequency and amplitude. The EL6201C is available in both the 8-pin MSOP and the 5-pin SOT23, to enable device placement close to the laser for reduced EMI.

The oscillator frequency is set by connecting a single external resistor from the RFREQ pin to ground. The oscillator current output amplitude is set by connecting a single external resistor from the RAMP pin to ground. The oscillator in the MSOP package also contains a high speed output disable function using the OE pin. The OE pin can be driven by a high speed timing signal to control precise laser modulation during read/write operations. The output current is disabled when a logical zero ‘L’ is driven to the CE pin. Supply current is reduced to microamps when CE = LOW.

The EL6201C has internal supply bypass capacitors to reduce oscilla tion noise spread through supply connections.

Features

• Small SOT-23 and MSOP-8 packages

• Frequency to 430MHz min.

• Amplitude to 25mAP-P min.

• Output tristate function (MSOP-8)

• Power-down function (MSOP-8)

• Single +3.5V to +5.0V supply

• Simple to use - only two external resistors required

• Independent resistor setting for frequency and amplitude.

Applications

• DVD players

• DVD-ROM drives

• DVD-RAM drives

• CD-RW drives

• MO drives

• Optical pickup head assembly

• Laser diode modulation

• Local oscillator

• Communications lasers