ATR0849-PFQG ATMEL Corporation, ATR0849-PFQG Datasheet

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ATR0849-PFQG

Manufacturer Part Number
ATR0849-PFQG
Description
Manufacturer
ATMEL Corporation
Datasheets

Specifications of ATR0849-PFQG

Date_code
0549+
Packing_info
QFN-24

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Features
Applications
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 up to
150 mA. Total gains of 100 (read channel) and 250 (channels 2, 3 and 4), are pro-
vided between each reference current input and the selected output. Although the
reference inputs are current inputs, voltage control is possible by using external resis-
tors. An on-chip RF oscillator is available to reduce laser-mode hopping noise during
read mode. The oscillator current amplitude can be set independently for the two
selectable outputs with two different resistors. Oscillation is enabled by a high signal
at the ENOSC pin. Complete shutdown of the output currents is achieved by a low sig-
nal at the ENABLE input.
In read mode, the reference currents (I2, I3, I4) should be switched off to reduce
power consumption.
In case of uncertain (balanced) enable signals, a built-in fail-safe circuit will reduce the
laser diode output current to a safe value.
Current-controlled Output Current Source with 4 Input Channels
LVDS Compatible Inputs at Channels 2, 3 and 4 with On-chip 100 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
DVD+/-RW Dual Layer with CD-RW Capability
Recordable Optical Drives
4 mm Package
Note: This is a summary document. A complete dorcument
is available under NDA. For more information, please con-
tact your local Atmel sales office.
4-Channel LVDS
Laser Driver for
Dual-layer
Application
ATR0849
Summary
Rev. 4851BS–DVD–06/05

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