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Электронный компонент: T0806

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Rev. 4522ESDVD01/04
Features
Current-controlled Output Current Source, 3 Input Channels
Two Selectable Outputs for Grounded Laser Diodes
Output Current per Channel up to 250 mA
Total Output Current to 300 mA (Minimum)
Rise Time 1.0 ns, Fall Time 1.1 ns
On-chip RF Oscillator
Control of 2 Different 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
Small PB-free QFN16 (4 mm
4 mm) or SSO16 Package
Applications
DVD-ROM with CD-RW Capability (Combo Drives)
Combo Drives with CD and DVD Writing Capability
Description
The T0806 is a laser diode driver for the operation of two different grounded laser
diodes for DVD-RAM (650 nm) and CD-RW (780 nm) drives. It includes three chan-
nels 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 pro-
vided 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 and switched to one of the two outputs IOUTA or IOUTB by the select input
SELA. Each channel can contribute up to 250 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.
An on-chip RF oscillator is provided to reduce laser mode hopping noise during read
mode. Swing 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 output
current and oscillator switch-off is achieved by a low signal at the ENABLE input.
Figure 1. Block Diagram
Channel 2
I3
NE3
I2
NE2
Read channel
RF oscillator
IR
ENOSC
ENABLE
RSA
IOUTA
IOUTB
RF
RSB
SELA
Channel 3
3-Channel Laser
Driver with
RF Oscillator
and 2 Outputs
T0806
Summary
2
T0806
4522ESDVD01/04
Pin Configuration
Figure 2. Pinning SSO16
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I3
RF
NE2
NE3
ENABLE
ENOSC
IR
I2
GND
RSA
RSB
IOUTB
SELA
VCC2
VCC1
IOUTA
T0806
Pin Description SSO16
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
RF
Analog
External resistor to GND sets oscillator frequency of oscillator A
5
NE2
Digital
Digital control of channel 2 (low active)
6
NE3
Digital
Digital control of channel 3 (low active)
7
ENABLE
Digital
Enables output current (high active)
8
ENOSC
Digital
Enables RF oscillator (high active)
9
VCC2
Supply
+5 V power supply for IOUT
10
SELA
Digital
High: selects IOUTA, RSA
Low: selects IOUTB, RSB
11
IOUTB
Analog
Output current source B for laser diode
12
RSB
Analog
External resistor to GND sets swing of oscillator B
13
RSA
Analog
External resistor to GND sets swing of oscillator A
14
GND
Supply
Ground
15
IOUTA
Analog
Output current source A for laser diode
16
VCC1
Supply
+5 V power supply for IOUT and circuit
3
T0806
4522ESDVD01/04
Figure 3. Pinning QFN16
I3
RF
NE2
NE3
GND
RSA
RSB
IOUTB
I2
IR
V
CC1
IO
U
T
A
EN
ABL
E
EN
O
S
C
V
CC2
SEL
A
16 15 14 13
5 6 7 8
1
2
3
4
12
11
10
9
Pin Description QFN16
Pin
Symbol
Type
Function
1
I3
Analog
Input current, bias voltage approximately GND
2
RF
Analog
External resistor to GND sets oscillator frequency
3
NE2
Digital
Digital control of channel 2 (low active)
4
NE3
Digital
Digital control of channel 3 (low active)
5
ENABLE
Digital
Enables output current (high active)
6
ENOSC
Digital
Enables RF oscillator (high active)
7
VCC2
Supply
+5 V power supply for IOUT
8
SELA
Digital
High: selects IOUTA, RSA
Low: selects IOUTB, RSB
9
IOUTB
Analog
Output current source B for laser diode
10
RSB
Analog
External resistor to GND sets swing of oscillator B
11
RSA
Analog
External resistor to GND sets swing of oscillator A
12
GND
Supply
Ground
13
IOUTA
Analog
Output current source A for laser diode
14
VCC1
Supply
+5 V power supply for IOUT and circuit
15
IR
Analog
Input current, bias voltage approximately GND
16
I2
Analog
Input current, bias voltage approximately GND
Paddle
GND
Supply
Ground
4
T0806
4522ESDVD01/04
Absolute Maximum Ratings
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 +1.0
V
Input voltage at NE2, NE3, ENOSC
V
IN2
0.5 to V
CC
+0.5
V
Output voltage
V
OUT
0.5 to V
CC
1
V
Total output current
I
OUT
350
mA
Output current per channel
I
OUT (IR, I2, I3)
300
mA
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
= 70
C
2. R
thJA
115 K/W, T
amb
= 25
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
R
thJA
135
K/W
Recommended Operating Conditions
Parameters
Symbol
Value
Unit
Supply voltage range
V
CC
4.5 to 5.5
V
Input current
I
IR
/I
I2
/I
I3
< 3.0
mA
External resistor to GND to set oscillator
frequency
RF
> 3
k
External resistor to GND to set oscillator swing
RSA, RSB
> 1
k
Operating temperature range
T
amb
0 to +70
C
Ordering Information
Extended Type Number
Package
Remarks
T0806-TCQ
SSO16
Taped and reeled
T0806-PEQG
Pb-free QFN16 (4 mm
4 mm)
Taped and reeled
5
T0806
4522ESDVD01/04
Package Information