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PDF ATR0808 Data sheet ( Hoja de datos )
| Número de pieza | ATR0808 | |
| Descripción | Three Channel Laser Driver | |
| Fabricantes | ATMEL Corporation | |
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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
• 200 Ω Channel Input Resistance
• On-chip RF Oscillator
• Control of Two Different Swings by Use of Two External Resistors
• Oscillator Frequency Range from 200 MHz to 500 MHz
• Oscillator Swing: 100 mA
• Single 5 V Power Supply
• Common Enable/Disable Input
• TTL/CMOS Control Signals
• Small Pb-free QFN16 (4 mm × 4 mm) or SSO16 Package
Applications
• DVD-ROM with CD-RW Capability
• DVD+RW with CD-RW Capability
• DVD-RW with CD-RW Capability
• Writable Optical Drives
Three Channel
Laser Driver
with RF
Oscillator and
Two Outputs
ATR0808
Description
The ATR0808 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 chan-
nels 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 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 refer-
ence 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 provided to reduce laser mode hopping noise during read mode. Swing 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 output current and oscillator
switch-off is achieved by a low signal at the ENABLE input.
Summary
Rev. 4724ES–DVD–01/04
1 page  
ATR0808
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 ambient
RthJA
Note: 1. Measured with multi-layer test board (JEDEC standard)
Value
115(1)
Unit
K/W
Recommended Operating Conditions
Parameters
Supply voltage
Input current
External resistor to GND to set oscillator
frequency
External resistor to GND to set oscillator swing
Operating temperature range
Symbol
VCC
IIR, II2, II3
RF
RSA, RSB
Tamb
Value
4.5 to 5.5
IIR < 2.0, II2 = II3 < 1.5
>3
>1
0 to +70
Unit
V
mA
kΩ
kΩ
°C
4724ES–DVD–01/04
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ATR0808.PDF ] | |
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