ATR0808 [ATMEL]
Three Channel Laser Driver with RF Oscillator and Two Outputs; 三通道激光，射频振荡器和两个输出驱动器
| 型号： | ATR0808 |
| 厂家： | 
ATMEL |
| 描述： | Three Channel Laser Driver with RF Oscillator and Two Outputs |
| 文件： | 总8页 (文件大小：237K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
• Current-controlled Output Current Source with 3 Input Channels
• Two Selectable Outputs for Grounded Laser Diodes
• Output Current per Write Channel: 350 mA
• Total Output Current: 500 mA
• 200 Ω Channel Input Resistance
• On-chip RF Oscillator
• Control of Two Different Swings by Use of Two External Resistors
• Oscillator Frequency Range from 200 MHz to 500 MHz
• Oscillator Swing: 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
Three Channel
Laser Driver
with RF
Oscillator and
Two Outputs
Applications
• DVD-ROM with CD-RW Capability
• DVD+RW with CD-RW Capability
• DVD-RW with CD-RW Capability
• Writable Optical Drives
ATR0808
Summary
Description
The ATR0808 is a laser diode driver for the operation of two different grounded laser
diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). 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 the 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 and switched to one of the two IOUTA or IOUTB outputs by the select input
SELA. Each write channel (channel 2 and 3) can contribute up to 350 mA to the total
output current, up to 500 mA. The read channel can contribute up to 150 mA. Total
gains of 100 (read channel), 250 (channel 2 and 3) are provided between each refer-
ence 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.
Rev. 4724ES–DVD–01/04
Figure 1. Block Diagram
I3
Channel 3
Channel 2
NE3
IOUTA
IOUTB
I2
NE2
IR
Read channel
RF oscillator
ENABLE
ENOSC
RF
SELA
RSA RSB
2
ATR0808
4724ES–DVD–01/04
ATR0808
Pin Configuration SSO16
Figure 2. Pinning SSO16
IR
I2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC1
IOUTA
GND
I3
RF
RSA
NE2
RSB
NE3
IOUTB
SELA
VCC2
ENABLE
ENOSC
Pin Description
Pin
Symbol
Type
Analog
Analog
Analog
Analog
Digital
Digital
Digital
Digital
Supply
Function
1
IR
Input current, bias voltage approximately GND
Input current, bias voltage approximately GND
Input current, bias voltage approximately GND
External resistor to GND sets frequency of oscillator
Digital control of channel 2 (low active)
Digital control of channel 3 (low active)
Enables output current (high active)
2
I2
3
I3
4
RF
5
NE2
6
NE3
7
ENABLE
ENOSC
VCC2
8
Enables RF oscillator (high active)
9
+5 V power supply for IOUT
High: selects IOUTA, RSA
Low: selects IOUTB, RSB
10
SELA
Digital
11
12
13
14
15
16
IOUTB
RSB
Analog
Analog
Analog
Supply
Analog
Supply
Output current source B for laser diode
External resistor to GND sets swing of oscillator B
External resistor to GND sets swing of oscillator A
Ground
RSA
GND
IOUTA
VCC1
Output current source A for laser diode
+5 V power supply for IOUT and circuit
3
4724ES–DVD–01/04
Pin Configuration QFN16
Figure 3. Pinning QFN16
16 15 14 13
I3
RF
12 GND
11 RSA
10 RSB
1
2
3
4
NE2
NE3
9
IOUTB
5
6 7 8
Pin Description
Pin
Symbol
Type
Analog
Analog
Digital
Digital
Digital
Digital
Supply
Function
1
I3
Input current, bias voltage approximately GND
External resistor to GND sets frequency of oscillator
Digital control of channel 2 (low active)
Digital control of channel 3 (low active)
Enables output current (high active)
Enables RF oscillator (high active)
2
RF
3
NE2
4
NE3
5
ENABLE
ENOSC
VCC2
6
7
+5 V power supply for IOUT
High: selects IOUTA, RSA
Low: selects IOUTB, RSB
8
SELA
Digital
9
10
IOUTB
RSB
RSA
GND
IOUTA
VCC1
IR
Analog
Analog
Analog
Supply
Analog
Supply
Analog
Analog
Supply
Output current source B for laser diode
External resistor to GND sets swing of oscillator B
External resistor to GND sets swing of oscillator A
Ground
11
12
13
Output current source A for laser diode
+5 V power supply for circuit
14
15
Input current, bias voltage approximately GND
Input current, bias voltage approximately GND
Ground
16
I2
Paddle
GND
4
ATR0808
4724ES–DVD–01/04
ATR0808
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
VCC
Vin
Value
-0.5 to +6.0
-0.5 to VCC +0.5
0.7(1) to 1(2)
-0.5 to VCC -1
150
Unit
V
Supply voltage
Input voltage at any input
Power dissipation
Output voltage
V
Pmax
Vout
W
V
Junction temperature
Storage temperature
Tj
°C
°C
Tstg
-65 to +125
Notes: 1. RthJA ≤115 K/W at Tamb = 70°C
2. RthJA ≤115 K/W at Tamb = 25°C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
RthJA
115(1)
K/W
Note:
1. Measured with multi-layer test board (JEDEC standard)
Recommended Operating Conditions
Parameters
Supply voltage
Input current
Symbol
Value
Unit
V
VCC
4.5 to 5.5
IIR, II2, II3
IIR < 2.0, II2 = II3 < 1.5
mA
External resistor to GND to set oscillator
frequency
RF
> 3
kΩ
External resistor to GND to set oscillator swing
Operating temperature range
RSA, RSB
Tamb
> 1
kΩ
0 to +70
°C
5
4724ES–DVD–01/04
Ordering Information
Extended Type Number
Package
Remarks
ATR0808-TCQG
Pb-free SSO16
Taped and reeled
Taped and reeled
ATR0808-PEQG
Pb-free QFN16 (4 mm x 4 mm)
Package SSO16
6
ATR0808
4724ES–DVD–01/04
ATR0808
Package QFN16 (4 mm x 4 mm)
7
4724ES–DVD–01/04
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4724ES–DVD–01/04
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