ATR0849

www.DataSheet4U.com Features Current-controlled Output Current Source with 4 Input Channels LVDS Compatible Inputs at Channels 2, 3 and 4 with On-chip 100Ω Termination Separate Read-channel Enable Two Selectable Outputs for Grounded Laser Diodes Output Current per Channel up to 350 mA Total Output Current up to 600 mA On-chip RF Oscillator Control of 2 Different Swings and Frequencies by use of 4 External Resistors Oscillator Frequency Range from 200 MHz to 500 MHz Maximum Oscillator Current Amplitude 100 mApp Single 5V Power Supply Small Pb-free QFN24, 4 mm × 4 mm Package Applications DVD+/-RW Dual Layer with CD-RW Capability Recordable Optical Drives 4-Channel LVDS Laser Driver for Dual-layer Application ATR0849 1. Description The ATR0849 is a laser diode driver designed to operate two different grounded laser diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). The device includes four channels for four different optical power levels. The write channels (channels 2 to 4) can be controlled by fast LVDS (Low Voltage Differential Signaling). The read channel generates a continuous output current, whereas channels 2 to 4 are designed as write channels with very fast switching speed. All channels are summed together and routed to one of the two outputs, IOUTA or IOUTB, controlled by the select input, SELA. Each write channel (channel 2 to 4) can contribute up to 350 mA to the total output current of up to 600 mA. The read channel can contribute ...