EL6259

The EL6259C is a low noise four channel laser diode current amplifie that provides controlled current to a grounded laser diode. The fou amplifiers can provide up to 150 mA per channel of DC or pulsed cur rent. Channels 2, 3, and 4 must be used as the write channels, with switching speeds of approximately one nanosecond rise/fall time. Al four channels are summed together at the I_OUT output, allowing the user to create multilevel waveforms in order to optimize laser diode performance. The level of the output current is set by an analog volt age applied to an external resistor which converts the voltage into a current at the I_IN pin. The current seen at this pin is then amplified by 100X to become a current source at pin I_OUT.

The external resistors allow the user to accurately and independently set each amplifier transconductance by applying a voltage to each resistor, without restriction on the voltage range, thus ensuring broad voltage DAC compatibility. Alternatively, the I_IN pin can be biased from a current DAC or other current source.