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Электронный компонент: T0816-PEQG

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Rev. 4505GDVD09/03
Features
Current-controlled Output Current Source, 3 Input Channels
Low-power Consumption
Output Current per Channel to 250 mA
Total Output Current to 300 mA
Rise Time 1.0 ns, Fall Time 1.1 ns
On-chip RF Oscillator
Control of Frequency and Swing by Use of 2 External Resistors
Oscillator Frequency Range from 200 MHz to 500 MHz
Oscillator Swing to 100 mA
Single 5 V Power Supply
Common Enable, Disable Input
TTL/CMOS Control Signals
Small SSO16 Package and QFN16 Package
Applications
CD-RW Drives
Writable Optical Drives
Description
The T0816 is a laser diode driver for the operation of a grounded laser diode for
CD-RW drives. It includes three channels for three different optical power levels which
are controlled by a separate IC. The read channel generates a continuous output level
whereas 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 at the IOUT pin. Each channel can contribute up to
250 mA to the total output current of up to 300 mA. A total gain of 100 (read channel),
250 (channel 2) and 150 (channel 3) are provided between each reference current
input and the 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. Frequency and swing can be set by two external resistors. Oscillation is
enabled by a `high' at the ENOSC pin. Complete output current and oscillator switch-
off is achieved by a `low' at the ENABLE input.
Figure 1. Block Diagram
Channel 3
Channel 2
I3
NE3
I2
NE2
Read channel
RF oscillator
IR
ENOSC
ENABLE
IOUT
RF
RS
NER
3-Channel Laser
Driver with RF
Oscillator
T0816
2
T0816
4505GDVD09/03
Pin Configuration
Figure 2. Pinning SSO16
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IR
I2
GND
RF
I3
NER
NE2
NE3
VCC1
VCC2
IOUT
GND
RS
ENABLE
ENOSC
VCC2
Pin Description: SSOP16
Pin
Symbol
Type
Function
1
IR
Analog
Input current, bias voltage approximately GND
2
I2
Analog
Input current, bias voltage approximately GND
3
GND
Supply
Ground
4
RF
Analog
External resistor to GND sets oscillator frequency
5
I3
Analog
Input current, bias voltage approximately GND
6
NER
Digital
Digital control of read channel (low active)
7
NE2
Digital
Digital control of channel 2 (low active)
8
NE3
Digital
Digital control of channel 3 (low active)
9
VCC2
Supply
+5 V power supply for IOUT
10
ENOSC
Digital
Enables RF oscillator (high active)
11
ENABLE
Digital
Enables output current (high active)
12
RS
Analog
External resistor to GND sets oscillator swing
13
GND
Supply
Ground
14
IOUT
Analog
Output current source for laser diode
15
VCC2
Supply
+5 V power supply for IOUT
16
VCC1
Supply
+5 V power supply for circuit
3
T0816
4505GDVD09/03
Figure 3. Pinning QFN16
NC
RF
I3
NER
IOUT
IOUT
RS
ENABLE
I2
IR
V
CC1
V
CC2
NE
2
NE
3
V
CC2
EN
O
S
C
16 15 14 13
5 6 7 8
1
2
3
4
12
11
10
9
Pin Description: QFN16
Pin
Symbol
Type
Function
1
NC
Not connected
2
RF
Analog
External resistor to GND sets frequency of oscillator A
3
I3
Analog
Input current, bias voltage approximately GND
4
NER
Digital
Digital control of R channel (low active)
5
NE2
Digital
Digital control of channel 2 (low active)
6
NE3
Digital
Digital control of channel 3 (low active)
7
VCC2
Supply
+5 V power supply for IOUT
8
ENOSC
Digital
Enables RF oscillator (high active)
9
ENABLE
Digital
Enables output current (high active)
10
RS
Analog
External resistor to GND sets oscillator swing
11,12
IOUT
Analog
Output current source for laser diode
13
VCC2
Supply
+5 V power supply for IOUT
14
VCC1
Supply
+5 V power supply for circuit
15
IR
Analog
Input current, bias voltage approximately GND
16
I2
Analog
Input current, bias voltage approximately GND
Paddle
GND
Supply
Ground
4
T0816
4505GDVD09/03
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
V
CC
-0.5 to +6.0
V
Input voltage at IR, I2, I3
V
IN1
-0.5 to + 2.0
V
Input voltage at NER, NE2, NE3, ENOSC
V
IN2
-0.5 to V
CC
+ 0.5
V
Output voltage
V
OUT
-0.5 to V
CC
1
V
Power dissipation
P
Max
0.7
(1)
to 1
(2)
W
Junction temperature
T
J
150
C
Storage temperature range
T
Stg
-65 to +125
C
Notes:
1. R
thJA
115 K/W, T
amb
= 70C
2. R
thJA
115 K/W, T
amb
= 25C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
R
thJA
115
(1)
K/W
Note:
1. Measured with multi-layer test board (JEDEC standard)
Operating Range
Parameters
Symbol
Value
Unit
Supply voltage range
V
CC
4.5 to 5.5
V
Input current
I
IR
I
I2
I
I3
< 2.5
< 1.0
<1.7
mA
External resistor to GND to set oscillator
frequency
RF
> 3
k
W
External resistor to GND to set oscillator swing
RS
> 1
k
W
Operating temperature range
T
amb
0 to +70
C
5
T0816
4505GDVD09/03
Electrical Characteristics: General
V
CC
= 5 V, T
amb
=25C, ENABLE = High, NER = Low, NE2 = NE3 = High, ENOSC = Low, unless otherwise specified
No.
Parameters
Test Conditions
Pin
(1)
Symbol
Min.
Typ.
Max.
Unit
Type*
1
Power Supply
1.1
Supply current, power
down
ENABLE = Low,
NE2 = NE3 = Low
9; 15;
16
ICC
PD2
0.3
mA
A
1.2
Supply current, read
mode, oscillator
disabled
I
IR
= 500 A,
I
I2
= 200 A,
I
I3
= 333 A
9; 15;
16
ICC
R1
86
mA
A
1.3
Supply current, read
mode, oscillator
enabled
I
IR
= 500 A,
I
I2
= 200 A,
I
I3
= 333 A,
ENOSC = High,
RS = 7.5 k
W
,
RF = 7.5 k
W
9; 15;
16
ICC
R2
90
mA
A
1.4
Supply current, write
mode
I
IR
= 500 A,
I
I2
= 200 A,
I
I3
= 333 A,
NE2 = NE3 = Low
9; 15;
16
ICC
W
175
mA
A
1.5
Supply current, input
off
I
IR
= I
I2
= I
I3
= 0 A
9; 15;
16
ICC
off
15
mA
A
2
Digital Inputs
2.1
NER/NE2/NE3 low
voltage
6, 7, 8
VNE
LO
1.3
V
A
2.2
NER/NE2/NE3 high
voltage
6, 7, 8
VNE
HI
2.0
V
A
2.3
ENABLE low voltage
11
VEN
LO
0.5
V
A
2.4
ENABLE high voltage
11
VEN
HI
2.7
V
A
2.5
ENOSC low voltage
10
VEO
LO
0.5
V
A
2.6
ENOSC high voltage
10
VEO
HI
3.0
V
A
3
Current at Digital Inputs
3.1
NER/NE2/NE3 low
current
NE = 0 V
6, 7, 8
INE
LO
-300
A
A
3.2
NER/NE2/NE3 high
current
NE = 5 V
6, 7, 8
INE
HI
800
A
A
3.3
ENABLE low current
ENABLE = 0 V
11
IEN
LO
-150
A
A
3.4
ENABLE high current
ENABLE = 5 V
11
IEN
HI
100
A
A
3.5
ENOSC low current
ENOSC = 0 V
10
IEO
LO
-100
A
A
3.6
ENOSC high current
ENOSC = 5 V
10
IEO
HI
800
A
A
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Related to SSO16 package.