Features: • Current-controlled Output Current Source with 3 Input Channels• Two Selectable Outputs for Grounded Laser Diodes• Output Current per Write Channel: 350 mA• Total Output Current: 500 mA• 500 Channel Input Resistance• On-chip RF Oscillator• Con...
ATR0807: Features: • Current-controlled Output Current Source with 3 Input Channels• Two Selectable Outputs for Grounded Laser Diodes• Output Current per Write Channel: 350 mA• Total ...
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Parameters | Symbol | Value | Unit |
Supply voltage | VCC | -0.5 to +6.0 | V |
Input voltage at any input | Vin | -0.5 to VCC +0.5 | V |
Power dissipation | Pmax | 0.7 (1) to 1 (2) | W |
Output voltage | Vout | -0.5 to VCC -1 | V |
Junction temperature | Tj | 150 | °C |
Storage temperature | Tstg | -65 to +125 | °C |
The ATR0807 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). It includes three channels for three different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level, whereas the channels 2 and 3 are provided as write channels with very fast switching speeds. Write current pulses are enabled when a low signal is applied to the NE pins. All channels are summed together and switched to one of the two IOUTA or IOUTB outputs by the select input SELA. Each ATR0807 write channel (channel 2 and 3) can contribute up to 350 mA to the total output current, up to 500 mA. The read channel can contribute up to 150 mA. Total gains of 100 (read channel), 250 (channel 2 and 3) are provided between each reference current input and the selected output. Although, the reference inputs are current inputs, voltage control is possible by using external resistors. An ATR0807 on-chip RF oscillator is provided to reduce laser mode hopping noise during read mode. Swing can be set ndependently for the two selectable outputs with two different resistors. Oscillation is enabled by a high signal at the ENOSC pin. Complete output current and oscillator switch-off is achieved by a low signal at the ENABLE input.