Description
The ATR1841 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 Two-wire Interface (TWI) it is possible to fit the laser power for Blu-ray/HD-DVD, DVD and CD. Two bits are used to set the mode/gain level and 6 additional bits are used for gain trimming, within ±6 dB. Entering sleep mode is also controlled via the TWI.
The integrated PIN diode and the high speed amplifier with low output impedance ensures stable driver performance.
All output channels are set to tri-state during sleep mode.
Due to its small package size the ATR1841 is especially suited for applications with low height requirements like SLIM and Ultra-SLIM drives.

Features
• 405 nm, 650 nm and 780 nm Wavelengths Supported
• Blu-ray/HD-DVD x5, CD-R/RW x52, DVD-R/RW x16
• Adjustment of Mode and Gain by Setting Internal Register via Two-wire Interface (TWI)
• 200 MHz Channel Bandwidth
• Paraphase Outputs
• Internal Reference Voltage Generation
• Fast Settling Time
• Low Offset Voltage
• Power-down Mode
• Pb-free Optical 12-pin Package

Applications
• Blu-ray/HD-DVD
• DVD+RW with CD-RW Capability
• DVD-RW with CD-RW Capability
• DVD-RAM with CD-RW Capability
• Recordable Optical Data Storage Devices