ATMEL T0800

Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Current-controlled Output Current Source with 5 Input Channels
2 Selectable Outputs for Grounded Laser Diodes
Output Current per Channel up to 200 mA
Total Output Current up to 250 mA
Rise Time 1.0 ns/Fall Time 1.1 ns
On-chip RF Oscillator
Control of 2 Different Frequencies and Swings by Use of 4 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
Small SSO24 Package and QFN28 Package
5-Channel Laser
Driver with RF
Oscillator and
2 Outputs
Applications
• Combo Drives (DVD + CD-RW)
• DVD-RAM with CD-RW Capability
• DVD-RW with CD-RW Capability
T0800
1. Description
The T0800 is a laser diode driver for the operation of two different, grounded laser
diodes for DVD-RAM (650 nm) and CD-RW (780 nm). It includes five channels for five
different optical power levels which are controlled by a separate IC. The read channel
generates a continuous output level. The channels 2 to 5 are provided as write channels with very fast switching speeds. When a low signal is applied to the NE pins, write
current pulses are enabled. All channels are summed together and switched to one of
the two outputs IOUTA or IOUTB by the select input SELA. Each channel can contribute up to 200 mA to the total output current of up to 250 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. An on-chip RF oscillator reduces laser mode hopping noise during read mode.
Frequency and swing can be set independently for the two selectable outputs with two
pairs of 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.
Rev. 4503D–DVD–02/05
2. Pin Configuration
Figure 2-1.
Pinning SSO24
IR
I2
I3
I4
I5
RFA
RFB
NE2
NE3
NE4
NE5
ENABLE
Table 2-1.
2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC1
VCC2
IOUTA
IOUTA
GND
RSA
RSB
IOUTB
IOUTB
SELA
ENOSC
VCC2
Pin Description: SSO24
Pin
Symbol
Type
Function
1
IR
Analog
Input current, bias voltage approximately GND
2
I2
Analog
Input current, bias voltage approximately GND
3
I3
Analog
Input current, bias voltage approximately GND
4
I4
Analog
Input current, bias voltage approximately GND
5
I5
Analog
Input current, bias voltage approximately GND
6
RFA
Analog
External resistor to GND sets frequency of oscillator A
7
RFB
Analog
External resistor to GND sets frequency of oscillator B
8
NE2
Digital
Digital control of channel 2 (low active)
9
NE3
Digital
Digital control of channel 3 (low active)
10
NE4
Digital
Digital control of channel 4 (low active)
11
NE5
Digital
Digital control of channel 5 (low active)
12
ENABLE
Digital
Enables output current (high active)
13
VCC2
Supply
+5 V power supply for IOUT
14
ENOSC
Digital
Enables RF oscillator (high active)
15
SELA
Digital
High: selects IOUTA, RFA, RSA
Low: selects IOUTB, RFB, RSB
16/17
IOUTB
Analog
Output current source B for laser diode
18
RSB
Analog
External resistor to GND sets swing of oscillator B
19
RSA
Analog
External resistor to GND sets swing of oscillator A
20
GND
Supply
Ground
21/22
IOUTA
Analog
Output current source A for laser diode
23
VCC2
Supply
+5 V power supply for IOUT
24
VCC1
Supply
+5 V power supply for circuit
T0800
4503D–DVD–02/05
T0800
Pinning QFN28
I3
I2
IR
NC
VCC1
VCC2
VCC2
Figure 2-2.
1
2
3
4
5
6
7
28 27 26 25 24 23 22
21
20
19
18
17
16
15
8 9 10 11 12 13 14
IOUTA
IOUTA
GND
RSA
RSB
IOUTB
IOUTB
NE4
NE5
ENABLE
VCC2
VCC2
ENOSC
SELA
I4
I5
RFA
RFB
GND
NE2
NE3
Table 2-2.
Pin Description: QFN28
Pin
Symbol
Type
Function
1
I4
Analog
Input current, bias voltage approximately GND
2
I5
Analog
Input current, bias voltage approximately GND
3
RFA
Analog
External resistor to GND sets frequency of oscillator A
4
RFB
Analog
External resistor to GND sets frequency of oscillator B
5
GND
Supply
Ground
6
NE2
Digital
Digital control of channel 2 (low active)
7
NE3
Digital
Digital control of channel 3 (low active)
8
NE4
Digital
Digital control of channel 4 (low active)
9
NE5
Digital
Digital control of channel 5 (low active)
10
ENABLE
Digital
Enables output current (high active)
11, 12
VCC2
Supply
+5 V power supply IOUT
13
ENOSC
Digital
Enables RF oscillator (high active)
14
SELA
Digital
High: selects IOUTA, RFA, RSA
Low: selects IOUTB, RFB, RSB
15
IOUTB
Analog
Output current source B for laser diode
16
IOUTB
Analog
Output current source B for laser diode
17
RSB
Analog
External resistor to GND sets swing of oscillator B
18
RSA
Analog
External resistor to GND sets swing of oscillator A
19
GND
Supply
Ground
20
IOUTA
Analog
Output current source A for laser diode
21
IOUTA
Analog
Output current source A for laser diode
22, 23
VCC2
Supply
+5 V power supply IOUT
24
VCC1
Supply
+5 V power supply circuit
25
NC
–
26
IR
Analog
Input current, bias voltage approximately GND
27
I2
Analog
Input current, bias voltage approximately GND
28
I3
Analog
Input current, bias voltage approximately GND
Paddle
–
–
Not connected
Should be connected with ground
3
4503D–DVD–02/05
Figure 2-3.
Block Diagram
I5
NE5
Channel 5
I4
NE4
Channel 4
I3
NE3
Channel 3
I2
NE2
Channel 2
IR
IOUTA
IOUTB
Read channel
ENABLE
ENOSC
RF oscillator
RFA RFB RSA RSB
4
SELA
T0800
4503D–DVD–02/05
T0800
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.
Parameter
Symbol
Value
Unit
Supply voltage
VCC
-0.5 to +6.0
V
Input voltage at IR, I2, I3, I4, I5
VIN1
-0.5 to +0.5
V
Input voltage at NE2, NE3, NE4, NE5, ENOSC
VIN2
-0.5 to VCC +0.5
V
Output voltage
VOUT
-0.5 to VCC -1
V
0.7
(1)
(2)
to 1
W
Power dissipation
Ptot
Junction temperature
TJ
150
°C
Storage temperature range
Notes: 1. RthJA ≤115 K/W, Tamb = 70°C
Tstg
-65 to +125
°C
Symbol
Value(1)
Unit
RthJA
115 (SSO24)
35 (QFN28)
K/W
K/W
Symbol
Value
Unit
2. RthJA ≤115 K/W, Tamb = 25°C
4. Thermal Resistance
Parameter
Junction ambient
Note:
1. Measured with multi-layer test board (JEDEC standard JESD51-7)
5. Recommended Operating Conditions
Parameter
VCC
4.5 to 5.5
V
IIR, II2, II3, II4, II5
< 2.5
mA
External resistor to GND to set oscillator
frequency
RFA, RFB
>3
kΩ
External resistor to GND to set oscillator swing
RSA, RSB
> 100
Ω
Tamb
0 to +70
°C
Supply voltage range
Input current
Operating temperature range
5
4503D–DVD–02/05
6. Electrical Characteristics
VCC = 5 V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = NE5 = High, ENOSC = Low, unless otherwise specified
No.
1
Parameters
Test Conditions
Pin(1)
Symbol
Min.
Typ.
Max.
Unit
Type*
Power Supply
1.1
Supply current, power
down
ENABLE = Low,
NE2 = NE3 = NE4 =
NE5 = Low
11,12, 22,
23, 24
ICCPD2
0.5
mA
A
1.2
Supply current, read
mode, oscillator
disabled
IIR = II2 = II3 = II4 = II5 =
500 µA
11,12, 22,
23, 24
ICCR1
115
mA
A
1.3
Supply current, read
mode, oscillator
enabled, output A
selected
IIR = II2 = II3 = II4 = II5 =
500 µA,
ENOSC = High,
RS = 560 Ω,
RF = 7.5 kΩ,
SELA = High
11,12, 22,
23, 24
ICCR2
120
mA
A
1.4
Supply current, write
mode
IIR = II2 = II3 = II4 = II5 =
500 µA,
NE2 = NE3 = NE4 =
NE5 = Low
11,12, 22,
23, 24
ICCW
320
mA
A
1.5
Supply current, input
off
IIR = II2 = II3 = II4 = II5 =
0 µA
11,12, 22,
23, 24
ICCoff
18
mA
A
V
A
V
A
V
A
V
A
V
A
V
A
V
A
2
Digital Inputs
2.1
NE2/NE3/NE4/NE5
low voltage
6, 7, 8, 9
VNELO
2.2
NE2/NE3/NE4/NE5
high voltage
6, 7, 8, 9
VNEHI
2.3
SELA low voltage
14
VSELALO
2.4
SELA high voltage
14
VSELAHI
2.5
ENABLE low voltage
10
VENLO
2.6
ENABLE high voltage
10
VENHI
2.7
ENOSC low voltage
13
VEOLO
2.8
ENOSC high voltage
13
VEOHI
2.0
V
A
-300
µA
A
µA
A
µA
A
µA
A
µA
A
3
1.1
2.0
0.5
2.0
0.5
2.0
0.5
Currents at Digital Inputs
3.1
NE2/NE3/NE4/NE5
low current
NE = 0 V
6, 7, 8, 9
INELO
3.2
NE2/NE3/NE4/NE5
high current
NE = 5 V
6, 7, 8, 9
INEHI
3.3
SELA low current
SELA = 0 V
14
ISELALO
3.4
SELA high current
SELA = 5 V
14
ISELAHI
3.5
ENABLE low current
ENABLE = 0 V
10
IENLO
3.6
ENABLE high current
ENABLE = 5 V
10
IENHI
3.7
ENOSC low current
ENOSC = 0 V
13
IEOLO
3.8
ENOSC high current
ENOSC = 5 V
13
IEOHI
800
-45
150
-150
100
-100
800
µA
A
µA
A
µA
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
6
1. Related to QFN28 Package
T0800
4503D–DVD–02/05
T0800
7. Electrical Characteristics: Laser Amplifier
VCC = 5 V, Tamb = 25°C, ENABLE = High, unless otherwise specified
No.
4
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
100
130
mA/mA
A
Outputs IOUTA and IOUTB
4.1
Best fit current gain
Any channel(1)
15, 16,
20, 21
GAIN
90
4.2
Best fit current offset
Any channel(1)
15, 16,
20, 21
IOS
-8
+4
mA
A
4.3
Output current
linearity
Any channel(1)
15, 16,
20, 21
ILIN
-3
+3
%
A
4.5
Output current per
channel
Output is sourcing
15, 16,
20, 21
IOUTR
200
mA
A
4.6
Total output current
15, 16,
20, 21
IOUT
250
mA
A
4.7
IIN input impedance
RIN is to GND
1, 2, 26,
27, 28
RIN
170
Ω
A
4.8
NE threshold
Temperature
stabilized
6, 7, 8,
9
VTH
V
C
4.9
Output off current 1
ENABLE = Low
15, 16,
20, 21
IOFF1
1
mA
A
4.10
Output off current 2
NE2 = NE3 = NE4 =
NE5 = High
15, 16,
20, 21
IOFF2
1
mA
A
4.11
Output off current 3
NE2 = NE3 = NE4 =
NE5 = Low,
IIR = II2 = II3 = II4 = II5 =
0 µA
15, 16,
20, 21
IOFF3
5
mA
A
4.12
IOUT supply sensitivity,
read mode
IOUT = 40 mA,
VCC = 5 V ±10%,
read-only
15, 16,
20, 21
VSER
-5
1
%V
A
4.13
IOUT supply sensitivity,
write mode
IOUT = 80 mA, 40 mA
read + 40 mA write,
VCC = 5 V ±10%
15, 16,
20, 21
VSEW
-6
0
%V
A
4.14
IOUT current output
noise
IOUT = 40 mA,
ENOSC = Low
15, 16,
20, 21
INOO
3
nA/
rt-Hz
C
4.15
IOUT temperature
sensitivity, read mode
IOUT = 40 mA, read
only
15, 16,
20, 21
TSER
-100
ppm/°C
C
4.16
IOUT temperature
sensitivity, write mode
IOUT = 80 mA, 40 mA
read + 40 mA write
15, 16,
20, 21
TSEW
-300
ppm/°C
C
220
270
1.68
*) 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
7
4503D–DVD–02/05
8. Electrical Characteristics
VCC = 5 V, IOUT = 40 mA DC with 40-mA pulse, Tamb = 25°C, unless otherwise specified
No.
5
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
Outputs IOUTA and IOUTB, AC Performance
5.1
Write rise time
IOUT = 40 mA (read)
+40 mA (10%-90%)(1)
15, 16,
20, 21
tRISE
1.0
3.0
ns
C
5.2
Write fall time
IOUT = 40 mA (read)
+40 mA (10%-90%)(1)
15, 16,
20, 21
tFALL
1.1
3.0
ns
C
5.3
Output current
overshoot
IOUT = 40 mA (read) +
40 mA(1)
15, 16,
20, 21
OS
5
%
C
5.4
IOUT ON prop delay
NE 50% High-Low to
IOUT at 50% of final value
15, 16,
20, 21
tON
2.0
ns
C
5.5
IOFF OFF prop
delay
NE 50% Low-High to
IOUT at 50% of final value
15, 16,
20, 21
tOFF
2.0
ns
C
5.6
Disable time
ENABLE 50% High-Low
to IOUT at 50% of final
value
15, 16,
20, 21
tDIS
20
ns
C
5.7
Enable time
ENABLE 50% Low-High
to IOUT at 50% of final
value
15, 16,
20, 21
tEN
20
ns
C
5.8
Disable time
oscillator
ENOSC 50% Low-High
to IOUT at 50% of final
value
15, 16,
20, 21
TDISO
4
ns
C
5.9
Enable time
oscillator
ENOSC 50% High-Low
to IOUT at 50% of final
value
15, 16,
20, 21
TENO
2
ns
C
5.10
SELA delay
SELA Low-High 50% to
IOUT at 50% of final value
15, 16,
20, 21
TSAH
TBD
ns
C
5.11
SELA delay
SELA High-Low 50% to
IOUT at 50% of final value
15, 16,
20, 21
TSAL
TBD
ns
C
5.12
Amplifier
bandwidth
IOUT = 50 mA, all
channels, -3 dB value
15, 16,
20, 21
BWLCA
20
MHz
C
6
Oscillator
6.1
Oscillator
frequency
RF = 4.7 kΩ
15, 16,
20, 21
FOSC
MHz
A
6.2
Oscillator
temperature
coefficient
RF = 4.7 kΩ
15, 16,
20, 21
TCOSC
-150
ppm/°C
C
6.3
Disable time
oscillator
ENOSC 50% High-Low
to IOUT, at 10%/90% of
final value
15, 16,
20, 21
TDISO
4
ns
C
6.4
Enable time
oscillator
ENOSC 50% Low-High
to IOUT, at 10%/90% of
final value
15, 16,
20, 21
TENO
2
ns
C
380
470
560
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
8
T0800
4503D–DVD–02/05
T0800
9. Application Information Oscillator
Figure 9-1.
Frequency versus Resistor RFA and RFB (RS = 525 Ω)
550
Frequency (MHz)
500
450
400
350
300
250
200
4.0
5.0
6.0
7.0
8.0
9.0
10.0
RFA, RFB (kΩ)
Figure 9-2.
Swing versus Resistor RSA and RSB (RF = 7.82 kΩ)
120
Swing (mA pk/pk)
100
80
60
40
20
0
0.0
200.0
400.0
600.0
800.0
1000.0
1200.0
450.0
500.0
RSA, RSB (Ω)
Figure 9-3.
Frequency Dependency of Swing
60
Swing (mA pk/pk)
50
40
30
20
10
0
200.0
250.0
300.0
350.0
400.0
Frequency (MHz)
9
4503D–DVD–02/05
Figure 9-4.
Transfer Characteristic of all Channels (Gain = 111)
350
IOUT (mA)
300
250
200
150
100
50
0
0.0
500.0
1000.0
1500.0
2000.0
2500.0
3000.0
IR/I2/I3/I4/I5 (mA)
Figure 9-5.
Output Characteristic (Voltage Compliance) R(IOUT) = 5.8 Ω
350
300
IOUT (mA)
250
200
150
100
50
0
0.0
1.0
2.0
3.0
4.0
5.0
VCC - V(IOUT)/V
Figure 9-6.
10
Output Pulse, Read: 50 mA, Write: 250 mA pk-pk
T0800
4503D–DVD–02/05
T0800
Figure 9-7.
Timing Diagram of IOUT
ENABLE
NE2
NE3
NE4
NE5
tON
tOFF
tOFF
tON
tOFF
tON
IOUT
tON
tOFF
tf
tr
tEN
tDIS
tf
tr
tf
tr
tf
tr
Figure 9-8.
Application Circuit
A
n
a
l
o
g
D
i
g
i
t
a
l
VCC
IR
I2
I3
I4
I5
RFA
RFB
NE2
NE3
NE4
NE5
ENABLE
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC1
VCC2
IOUTA
IOUTA
GND
RSA
RSB
IOUTB
IOUTB
SELA
ENOSC
VCC2
LD
LD
VCC
11
4503D–DVD–02/05
10. Ordering Information
Extended Type Number
Package
Remarks
T0800-TNQ
SSO24
Taped and reeled
T0800-PJQ
QFN28
Taped and reeled
11. Package Information
5.7
5.3
Package SSO24
Dimensions in mm
8.05
7.80
4.5
4.3
1.30
0.15
0.15
0.05
0.25
6.6
6.3
0.65
7.15
24
13
technical drawings
according to DIN
specifications
1
12
12
T0800
4503D–DVD–02/05
T0800
13
4503D–DVD–02/05
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