ATMEL T0806-TCQ

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
3-Channel Laser
Driver with
RF Oscillator
and 2 Outputs
Applications
• DVD-ROM with CD-RW Capability (Combo Drives)
• Combo Drives with CD and DVD Writing Capability
Description
T0806
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 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 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.
Summary
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
I3
NE3
Channel 3
I2
NE2
Channel 2
IR
ENABLE
ENOSC
IOUTA
IOUTB
Read channel
RF oscillator
RF
RSA RSB
SELA
Rev. 4522ES–DVD–01/04
Pin Configuration
Figure 2. Pinning SSO16
IR
1
16
VCC1
I2
2
15
IOUTA
I3
3
14
GND
RF
4
13
RSA
NE2
5
12
RSB
NE3
6
11
IOUTB
ENABLE
7
10
SELA
ENOSC
8
9
VCC2
T0806
Pin Description SSO16
2
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
T0806
4522ES–DVD–01/04
T0806
I2
IR
VCC1
IOUTA
Figure 3. Pinning QFN16
1
2
3
4
16 15 14 13
12
11
10
9
5 6 7 8
GND
RSA
RSB
IOUTB
ENABLE
ENOSC
VCC2
SELA
I3
RF
NE2
NE3
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
3
4522ES–DVD–01/04
Absolute Maximum Ratings
Parameters
Symbol
Value
Unit
Supply voltage
VCC
–0.5 to +6.0
V
Input voltage at IR, I2, I3
VIN1
–0.5 to +1.0
V
Input voltage at NE2, NE3, ENOSC
VIN2
–0.5 to VCC +0.5
V
Output voltage
VOUT
–0.5 to VCC –1
V
Total output current
IOUT
350
mA
IOUT (IR, I2, I3)
300
mA
PMAX
0.7 (1) to 1 (2)
W
TJ
150
°C
TStg
–65 to +125
°C
Symbol
Value
Unit
RthJA
135
K/W
Symbol
Value
Unit
VCC
4.5 to 5.5
V
IIR/II2/II3
< 3.0
mA
RF
>3
kΩ
RSA, RSB
>1
kΩ
Tamb
0 to +70
°C
Output current per channel
Power dissipation
Junction temperature
Storage temperature range
Notes:
1. RthJA ≤115 K/W, Tamb = 70° C
2. RthJA ≤115 K/W, Tamb = 25° C
Thermal Resistance
Parameters
Junction ambient
Recommended Operating Conditions
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
Ordering Information
Extended Type Number
T0806-TCQ
T0806-PEQG
4
Package
Remarks
SSO16
Taped and reeled
Pb-free QFN16 (4 mm × 4 mm)
Taped and reeled
T0806
4522ES–DVD–01/04
T0806
Package Information
5
4522ES–DVD–01/04
6
T0806
4522ES–DVD–01/04
Atmel Corporation
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel: 1(408) 441-0311
Fax: 1(408) 487-2600
Regional Headquarters
Europe
Atmel Sarl
Route des Arsenaux 41
Case Postale 80
CH-1705 Fribourg
Switzerland
Tel: (41) 26-426-5555
Fax: (41) 26-426-5500
Asia
Room 1219
Chinachem Golden Plaza
77 Mody Road Tsimshatsui
East Kowloon
Hong Kong
Tel: (852) 2721-9778
Fax: (852) 2722-1369
Japan
9F, Tonetsu Shinkawa Bldg.
1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
Japan
Tel: (81) 3-3523-3551
Fax: (81) 3-3523-7581
Atmel Operations
Memory
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel: 1(408) 441-0311
Fax: 1(408) 436-4314
RF/Automotive
Theresienstrasse 2
Postfach 3535
74025 Heilbronn, Germany
Tel: (49) 71-31-67-0
Fax: (49) 71-31-67-2340
Microcontrollers
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel: 1(408) 441-0311
Fax: 1(408) 436-4314
La Chantrerie
BP 70602
44306 Nantes Cedex 3, France
Tel: (33) 2-40-18-18-18
Fax: (33) 2-40-18-19-60
ASIC/ASSP/Smart Cards
1150 East Cheyenne Mtn. Blvd.
Colorado Springs, CO 80906, USA
Tel: 1(719) 576-3300
Fax: 1(719) 540-1759
Biometrics/Imaging/Hi-Rel MPU/
High Speed Converters/RF Datacom
Avenue de Rochepleine
BP 123
38521 Saint-Egreve Cedex, France
Tel: (33) 4-76-58-30-00
Fax: (33) 4-76-58-34-80
Zone Industrielle
13106 Rousset Cedex, France
Tel: (33) 4-42-53-60-00
Fax: (33) 4-42-53-60-01
1150 East Cheyenne Mtn. Blvd.
Colorado Springs, CO 80906, USA
Tel: 1(719) 576-3300
Fax: 1(719) 540-1759
Scottish Enterprise Technology Park
Maxwell Building
East Kilbride G75 0QR, Scotland
Tel: (44) 1355-803-000
Fax: (44) 1355-242-743
Literature Requests
www.atmel.com/literature
Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard
warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any
errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and
does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are
granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use
as critical components in life support devices or systems.
© Atmel Corporation 2004. All rights reserved.
Atmel ® and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries.
Other terms and product names may be the trademarks of others.
Printed on recycled paper.
4522ES–DVD–01/04