EL6272/EL6272C pdf datasheet (

?The EL6272C is a single channel laser diode current amplifier that ?
provides controlled current to a grounded laser diode. The amplifier ?
can provide up to 200 mA of DC or pulsed current with switching ?
speeds of approximately three nanoseconds rise/fall time. The level of ?
the output current is set by an analog voltage applied to an external ?
resistor which converts the voltage into a current at the IIN pin (virtu-?
ally ground). The current seen at this pin is then amplified by 100X to ?
become a current source at pin IOUT. ?
An on-chip 500 MHz oscillator is provided to allow current modula-?
tion when in read mode. This is turned on when the OSCEN pin is held ?
high. Complete control of amplitude and frequency is set by two exter-?
nal resistors connected to ground at pins RFREQ and RAMP (see ?
graphs in this data sheet for further explanation). ?