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PDF ATR0844 Data sheet ( Hoja de datos )
| Número de pieza | ATR0844 | |
| Descripción | 4-channel Laser Driver | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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)
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 single-
ended 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, IOUTA or IOUTB, controlled
by the select input SELA. Each write channel (channels 2 to 4) can contribute up to
350 mA to the total output current of up to 500 mA. The read channel can contribute
up to 150 mA. Total gain of 100 (read channel) and 250 (channel 2, 3 and 4), respec-
tively, 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 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 shut-down of the output currents is achieved by a
low signal at the ENABLE input.
In case of uncertain (balanced) enable signals, a built-in protection circuit keeps the
laser diode output current within the defined range.
www.DataSheet4U.com
4-channel Laser
Driver with
2 Outputs and
3 LVDS Inputs,
NER Enable,
On Chip
Termination
ATR0844
Summary
Rev. 4821AS–DVD–08/04
1 page  
Ordering Information
Extended Type Number
ATR0844-PFQG
Package Information
Package
Pb-free QFN24, 4 mm × 4 mm
Remarks
Taped and reeled
ATR0844
www.DataSheet4U.com
4821AS–DVD–08/04
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ATR0844.PDF ] | |
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