The EL6211 is a three-channel laser diode current amplifier that provides controlled current to a grounded laser diode. Channels 2 and 3 should be used as the write channels, with switching speeds of less than two nanoseconds rise/fall time. All three channels are summed together at the IOUT 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 voltage applied to an external resistor which converts the voltage into a current at the IIN pin (virtually ground).