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ATR0849 데이터시트 PDF




ATMEL Corporation에서 제조한 전자 부품 ATR0849은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 ATR0849 기능
기능 4-Channel LVDS Laser Driver for Dual-layer Application
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ATR0849 데이터시트, 핀배열, 회로
Features
Current-controlled Output Current Source with 4 Input Channels
LVDS Compatible Inputs at Channels 2, 3 and 4 with On-chip 100Termination
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 × 4 mm Package
Applications
DVD+/-RW Dual Layer with CD-RW Capability
Recordable Optical Drives
www.DataSheet4U.com
4-Channel LVDS
Laser Driver for
Dual-layer
Application
ATR0849
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.
Summary
Rev. 4851BS–DVD–06/05
Note: This is a summary document. A complete dorcument
is available under NDA. For more information, please con-
tact your local Atmel sales office.




ATR0849 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
3. 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
Voltage bettween LVDS inputs
(E2/NE2, E3/NE3, E4/NE4)
Power dissipation
Output voltage
Junction temperature
Storage temperature
Notes: 1. RthJA 115 K/W at Tamb = 70° C
2. RthJA 15 K/W at Tamb = 25° C
VCC
Vin
Vdmax
Pmax
Vout
Tj
Tstg
–0.5 to +6.0
–0.5 to VCC + 0.5
1.7
0.7(1 ) to 1(2)
–0.5 to VCC – 1
150
–65 to +125
V
V
V
W
V
°C
°C
4. Thermal Resistance
Parameters
Symbol
Junction ambient
RthJA
Note: Measured with multi-layer test board (JDEC standard)
Value
125
Unit
K/W
5. Recommended Operating Range
Parameters
Supply voltage
Input current
Voltage bettween LVDS inputs
(E2/NE2, E3/NE3, E4/NE4)
External resistor to GND to set oscillator frequency
External resistor to GND to set oscillator swing
Operating temperature range
Symbol
VCC
IIR, II2, II3, II4
Vd
RFA, RFB
RSA, RSB
Tamb
Value
4.5 to 5.5
< 1.5
0.5
>3
> 100
0 to +70
Unit
V
mA
V
k
°C
4 ATR0849
4851BS–DVD–06/05

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