T0820.pdf 데이터시트 (총 11 페이지) - 파일 다운로드 T0820 데이타시트 다운로드

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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.DataSShmeaelt4l 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

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Pin Configuration
Figure 2. Pinning SSO16
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IR 1
I2 2
RF 3
I3 4
I4 5
NE2 6
NE3 7
NE4 8
T0820
16 VCC1
15 VCC2
14 IOUT
13 GND
12 RS
11 ENABLE
10 ENOSC
9 VCC2
Pin Description
Pin Symbol
1 IR
2 I2
3 RF
4 I3
5 I4
6 NE2
7 NE3
8 NE4
9 VCC2
10 ENOSC
11 ENABLE
12 RS
13 GND
14 IOUT
15 VCC2
16 VCC1
Type
analog
analog
analog
analog
analog
digital
digital
digital
supply
digital
digital
analog
supply
analog
supply
supply
Function
Input current, bias voltage approximately GND
Input current, bias voltage approximately GND
External resistor to GND sets oscillator frequency
Input current, bias voltage approximately GND
Input current, bias voltage approximately GND
Digital control of channel 2 (low active)
Digital control of channel 3 (low active)
Digital control of channel 4 (low active)
+5 V power supply for IOUT
Enables RF oscillator (high active)
Enables output current (high active)
External resistor to GND sets oscillator swing
Ground
Output current source for laser diode
+5 V power supply for IOUT
+5 V power supply for circuit
2 T0820
4506E–DVD–09/02

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Absolute Maximum Ratings
Parameters
Supply voltage
Input voltage at IR, I2, I3, I4
Input voltage at NE2, NE3, NE4, ENOSC
Output voltage
Power dissipation
Junction temperature
Storage temperature range
www.DataNSohteeest:4U.1c.omRthJA £ 115 k/W, Tamb = 70°C
2. RthJA £ 115 k/W, Tamb = 25°C
Symbol
VCC
VIN1
VIN2
VOUT
PMAX
Tj
Tstg
Thermal Resistance
Parameters
Symbol
Junction ambient
RthJA
Note: 1. Measured with multi-layer test board (JEDEC standard)
Operating Range
Parameters
Supply voltage range
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, II4
RF
RS
Tamb
Value
-0.5 to +6.0
-0.5 to +0.8
-0.5 to VCC +0.5
-0.5 to VCC -1
0.7 (1) to 1 (2)
150
-65 to +125
Value
115 (1)
Value
4.5 to 5.5
<2
>3
> 100
0 to +70
T0820
Unit
V
V
V
V
W
_C
_C
Unit
K/W
Unit
V
mA
kW
W
°C
4506E–DVD–09/02
3

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Electrical Characteristics: General
VCC = 5 V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = High, ENOSC = Low, unless otherwise specified
No. Parameters
Test Condition
Pin Symbol Min. Typ. Max. Unit
1 Power supply
1.1 Supply current, power ENABLE = Low, NE2 9, 15,
down
= NE3 = NE4 = Low
16
ICCPD2
0.3
mA
1.2 Supply current,
read mode,
oscillator disabled
IIR = II2 = II3 = II4 =
500 mA
9, 15,
16
ICCR1
95 mA
1.3 Supply current,
www.DataSheet4U.rceoamd mode,
oscillator enabled
IIR = II2 = II3 = II4 =
500 mA,
ENOSC = High,
RS = 560 W,
RF = 7.5 kW
9, 15,
16
ICCR2
100 mA
1.4 Supply current,
write mode
IIR = II2 = II3 = II4=
500 mA, NE2 = NE3 =
NE4 = Low
9, 15,
16
ICCW
230 mA
1.5 Supply current,
input off
IIR = II2 = II3 = II4 = 0 mA 9, 15,
16
ICCoff
16 mA
2 Digital inputs
2.1 NE2/NE3/NE4 low
voltage
6, 7, 8
VNELO
1.3 V
2.2 NE2/NE3/NE4 high
voltage
6, 7, 8
VNEHI
2.0
V
2.3 ENABLE low voltage
2.4 ENABLE high voltage
2.5 ENOSC low voltage
2.6 ENOSC high voltage
3 Current at digital inputs
11 VENLO
11 VENHI 3.0
10 VEOLO
10 VEOHI 3.0
0.5 V
V
0.5 V
V
3.1 NE2/NE3/NE4 low
current
NE = 0 V
6, 7, 8
INELO
-300
mA
3.2 NE2/NE3/NE4 high
current
NE = 5 V
6, 7, 8
INEHI
800 mA
3.3 ENABLE low current ENABLE = 0 V
11 IENLO -150
3.4 ENABLE high current ENABLE = 5 V
11 IENHI
100
3.5 ENOSC low current ENOSC = 0 V
10 IEOLO -100
3.6 ENOSC high current ENOSC = 5 V
10 IEOHI
800
* Type means: A: 100% tested B: 100% correlation tested C: Characterized on samples D: Design parameter
mA
mA
mA
mA
Type*
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
a
4 T0820
4506E–DVD–09/02

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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
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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
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