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PDF ATR0809 Data sheet ( Hoja de datos )
| Número de pieza | ATR0809 | |
| Descripción | FOUR CHANNEL LASER DRIVER | |
| Fabricantes | ATMEL Corporation | |
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Features
• Current-controlled Output Current Source with 4 Input Channels
• Two Selectable Outputs for Grounded Laser Diodes
• Up to 350 mA Output Current per Channel
• Total Output Current up to 500 mA
• On-chip RF Oscillator
• Oscillator Frequency Range from 200 MHz to 500 MHz
• Individual Setting of RF Oscillator Current on Each Output by External Resistors
• Maximum Oscillator Current Amplitude 100 mA
• Single 5 V Power Supply
• Common Enable/Disable Input
• TTL/CMOS Compatible Control Signals
• Small Pb-free QFN20 or SSO20 Package
Applications
• DVD-ROM with CD-RW Capability
• DVD+RW with CD-RW Capability
• DVD-RW with CD-RW Capability
• Magneto-optical Drives and Others
Four Channel
Laser Driver
with RF
Oscillator and
Two Outputs
Description
ATR0809 is a laser diode driver for the operation of two different grounded laser
diodes for DVD-RW/+RW (650 nm) and CD-RW (780 nm). It includes four channels for
four different optical power levels. All channels (channel 1 = read channel, channel 2,
3, 4 = write channels) can be controlled by fast switches. The 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 outputs IOUTA or IOUTB by the select input
SELA. Each write channel (channel 2, 3 and 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 gains of 100 (read channel), 250 (channel 2 and 3) and 100 (channel 4) are pro-
vided between each reference current input and the selected output. Although the
reference inputs are current inputs, voltage control is also possible by using external
resistors. An on-chip RF oscillator can be used to reduce laser mode hopping noise in
read mode. The oscillator current amplitude and frequency can be set independently
for the two selectable outputs with four different resistors. Oscillation is enabled by a
high signal at the ENOSC pin. Complete shutdown of the output currents is achieved
by a low signal at the ENABLE input.
ATR0809
Summary
Rev. 4792BS–DVD–05/04
1 page  
ATR0809
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Value
Unit
Supply voltage
Input voltage at any input
Power dissipation
Output voltage
Junction temperature
Storage temperature
Notes: 1. RthJA ≤115 K/W at Tamb = 70°C
2. RthJA ≤115 K/W at Tamb = 25°C
VCC
Vin
Pmax
Vout
Tj
Tstg
-0.5 to +6.0
-0.5 to VCC +0.5
0.7(1) to 1(2)
-0.5 to VCC -1
150
-65 to +125
V
V
W
V
°C
°C
Thermal Resistance
Parameters
Symbol
Junction case
RthJC
Junction ambient
RthJA
Note: 1. Measured with multi-layer test board (JEDEC standard)
Value
27
125(1)
Unit
K/W
K/W
Recommended Operating Conditions
Parameters
Supply voltage
Input current
External resistor to GND to set oscillator
frequency
Symbol
VCC
IIR, II2, II3, II4
RFA, RFB
External resistor to GND to set oscillator swing
RSA, RSB
Operating temperature range
Tamb
Value
4.5 to 5.5
< 2.5
>3
>1
0 to +70
Unit
V
mA
kΩ
kΩ
°C
4792BS–DVD–05/04
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ATR0809.PDF ] | |
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