ATR0844

Features Current-controlled Output Current Source with 4 Input Channels LVDS Compatible Inputs Channel 2, 3, and 4 with On-chip 100 Ω 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 500 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 5 V Power Supply Small Pb-free QFN24 Package (4 mm × 4 mm) www.DataSheet4U.com Applications DVD+RW with CD-RW Capability DVD-RW with CD-RW Capability Recordable Optical Drives Description The ATR0844 is a laser diode driver designed to operate two different grounded laser diodes for DVD-RW/+RW (650 nm) and CD-RW (780 nm). The device includes four channels for four different optical power levels. The write channels (channel 2 to 4) can be controlled either by fast LVDS (Low Voltage Differential Signaling) or by singleended standard CMOS logic. In case of single-ended use, each of the ENABLE inputs (NEx or Ex) can be used, the complementary input may be left open. There is no need for blocking or connection to a reference voltage. The function of the read channel is to generate a continuous output current, 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, ...