The ATR1842 is a front monitor diode (FMD) which controls the laser power of the optical pickup for Blu-ray/HD-DVD, DVD and CD drives in one IC. With the serial programming interface (SPI) it is possible to fit the laser power for Blu-ray/HD-DVD, DVD and CD. 2 bits are used to set the mode/gain level and 6 additional bits are used for gain trimming, within 6 dB. Also setting into sleep mode can be done via the serial programmin interface (SPI). The integrated PIN diode and the high speed amplifier with low output impedance ensures stable driver performance.