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PDF T0820 Data sheet ( Hoja de datos )
| Número de pieza | T0820 | |
| Descripción | 4 CHANNEL LASER DRIVER | |
| Fabricantes | ATMEL Corporation | |
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Features
• Current-controlled Output Current Source with 4 Input Channels
• Low-power Consumption
• Output Current up to 150 mA, Read Channel and Channel 2
• Output Current up to 200 mA, Channel 3 and Channel 4
• Total Output Current to 300 mA
• Rise Time 1.0 ns, Fall Time 1.1 ns
• On-chip RF Oscillator
• Control Frequency and Swings by Use of 2 External Resistors
• Oscillator Frequency Range from 200 MHz to 600 MHz
• Oscillator Swing to 100 mA
• Single 5 V Power Supply
• Common Enable/Disable Input
• TTL/CMOS Control Signals
www.Da•taSShmeaelt4l US.ScoOm16 Package
Application
• DVD-RAM
• DVD-RW
• DVD+RW
• CD-RW
• Writable Optical Drives
4-Channel Laser
Driver with RF
Oscillator
T0820
Description
The T0820 is a laser diode driver for the operation of a grounded laser diode for
writable optical drives. It includes four channels for four different optical power levels
which are controlled by a separate IC. The read channel generates a continuous
output level whereas channels 2 to 4 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 at the IOUT pin. Read channel and
channel 2 can contribute up to 150 mA and channels 3 and 4 up to 200 mA to the total
output current of up to 300 mA. A total gain of 100 is 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. Frequency and swing can be set
by two external resistors. Oscillation is enabled by a "high" at the ENOSC pin. Com-
plete output current and oscillator switch-off is achieved by a `low' at the ENABLE
input.
Figure 1. Block Diagram
I4
NE4
Channel 4
I3
NE3
I2
NE2
IR
ENABLE
Channel 3
Channel 2
Read channel
IOUT
ENOSC
RF oscillator
RF RS
Rev. 4506E–DVD–09/02
1
1 page  
T0820
Electrical Characteristics: Laser Amplifier
VCC = 5 V, Tamb = 25°C, ENABLE = High, unless otherwise specified
No. Parameters
Test Conditions
Pin Symbol Min.
Typ.
Max.
Unit
4 Laser Amplifier
4.1 Best fit current gain
4.2 Best fit current offset
4.3 Output current linearity
Any channel (1)
Any channel (1)
Any channel (1)
14 GAIN 90 105 130 mA/mA
14 IOS
-8
+4 mA
14 ILIN
-3
+3 %
4.4 Input current range
Input is sinking
1, 2,
4, 5
IDAC
0
3 mA
4.5 Output current read
www.DataSheet4U.cchomannel
Output is sourcing
14 IOUTR 150
mA
4.6 Output current channel 2 Output is sourcing
4.7 Output current channel 3 Output is sourcing
4.8 Output current channel 4 Output is sourcing
4.9 Output current read
channel + channel 2
Output is sourcing
14 IOUT2 150
14 IOUT3 200
14 IOUT4 200
14 IOUTR,2 150
mA
mA
mA
mA
4.10 Output current channel 3 Output is sourcing
+ channel 4
14 IOUT3,4 200
mA
4.11 Total output current
4.12 IOUT series resistor
4.13 IIN input impedance
Output is sourcing
14 IOUT 300
mA
IOUT = 250 mA total
ROUT to VCC-Rail
14
ROUT
8
W
RIN is to GND
1, 2,
4, 5
RIN
150 200 250
W
4.14 NE threshold
Temperature
stabilized
6, 7, 8 VTH
1.68
V
4.15 Output off current 1
4.16 Output off current 2
4.17 Output off current 3
4.18 IOUT supply sensitivity,
read mode
ENABLE = Low
NE2=NE3=NE4=High
IIR=0 µA,
II2=II3=II4= 500 µA
NE2=NE3=NE4=Low,
IIR=II2=II3=II4= 0 µA
IOUT = 40 mA,
VCC = 5 V ± 10%,
read only
14
14
14
IOFF1
IOFF2
IOFF3
VSER
-4
1 mA
1 mA
5 mA
-1 %/V
4.19 IOUT supply sensitivity,
write mode
IOUT = 80 mA, 40 mA
read + 40 mA write,
VCC=5V±10%
14
VSEW
-6
0 %/V
4.20 IOUT current output noise IOUT = 40 mA,
ENOSC = Low
14 INOO
3
nA/
rt-Hz
4.21 IOUT temperature
sensitivity, read mode
IOUT = 40 mA, read
only
14 TSER
-500
ppm/
°C
4.22 IOUT temperature
sensitivity, write mode
IOUT = 80 mA, 40 mA
read + 40 mA Write
14
TSEW
-600
ppm/
°C
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note: 1. Linearity of the amplifier is calculated using a best fit method at three operating points of
IOUT at 20 mA, 40 mA, and 60 mA. IOUT = (IIN ´ GAIN) + IOS
Type*
A
A
A
C
A
A
A
A
A
A
A
C
A
B
A
A
A
A
A
C
C
C
4506E–DVD–09/02
5
5 Page 
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© Atmel Corporation 2002.
Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty
which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors
which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does
not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted
by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical
components in life support devices or systems.
Atmel® is the registered trademark of Atmel.
Other terms and product names may be the trademarks of others.
Printed on recycled paper.
4506E–DVD–09/02
xM
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet T0820.PDF ] | |
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