ATMEL ATR0885-PFQW

Features
•
•
•
•
•
•
•
•
•
Three Selectable Outputs
All Outputs Can Be Used Either for Standard (5V) or High Voltage (9V)
Maximum Output Current at All Outputs Up to 150 mA
On-chip Low-EMI RF Oscillator With Spread-spectrum Technology
Control of 3 Different Swings Using 3 External Resistors
Oscillator Frequency Range from 200 MHz to 500 MHz
Maximum Oscillator Current Amplitude 100 mApp
On-chip High-gain Transimpedance (IV) Amplifier
Small Green QFN24 4 mm × 4 mm Package
Applications
•
•
•
•
HD-DVD/DVD/CD ROM Drives
Blu-ray/DVD/CD ROM Drives
HD-DVD/DVD/CD Player
Blu-ray/DVD/CD Player
1. Description
ATR0885 is a laser diode driver designed to operate three different grounded or floating laser diodes fo r reading CDs (λ = 780 nm), DVDs (λ = 65 0 n m) , a nd
HD-DVDs/Blu-ray (λ = 405 nm). An on-chip, low-EMI RF oscillator is available to
reduce laser mode hopping noise. The oscillator’s current amplitude can be set independently for the three selectable outputs using three resistors (RSA, RSB, RSC).
The frequency setting is common to all IOUT outputs via a single resistor (RF). A logic
high level on the ENOSC pin enables the spread-spectrum RF oscillator. The
ATR0885 also includes a fast-settling transimpedance amplifier. It is provided to interface between the front-end monitor photo diode and the adaptive laser diode power
control circuit. The gain of the transimpedance amplifier can set independently for
each of the three outputs using the resistors RTIA, RTIB and RTIC.
3-output Laser
Driver for
HD-DVD/
Blu-ray/DVD/
CD-ROM
ATR0885
Preliminary
Summary
NOTE: This is a summary document.
The complete document is available
under NDA. For more information,
please contact your local Atmel sales
office.
4923CS–DVD–02/08
Figure 1-1.
Block Diagram
RTIA
RTIB
RTIC
PDIN
VREF
IR
SEL2
SEL1
PDOUT
VCCA
IOUTA
Read
channel
Block
enable
Logic
VCCB
IOUTB
VCCC
IOUTC
RF
oscillator
RF
RSA
RSB
RSC
ENOSC
Transimpedance
amplifier
2
ATR0885 [Preliminary]
4923CS–DVD–02/08
ATR0885 [Preliminary]
2. Pin Configuration
Pinning QFN24
IR
RSC
RSB
RSA
RF
GND
Figure 2-1.
1
24 23 22 21 20 19
18
2
17
3
16
4
15
5
14
6
7 8
13
9 10 11 12
IOUTA
VCCA
IOUTB
VCCB
IOUTC
VCCC
GND
VREF
PDIN
RTIA
RTIB
RTIC
GND
SEL1
SEL2
ENOSC
VCCS
PDOUT
Table 2-1.
Pin Description
Pin
Symbol
Type
Function
1
GND
Supply
Ground, power supply
2
SEL1
Digital
Logic pin 1 to select IOUT/ENABLE IC
3
SEL2
Digital
Logic pin 2 to select IOUT/ENABLE IC
4
ENOSC
Digital
Digital control of RF oscillator
5
VCCS
Supply
+5V power supply for internal circuit
6
PDOUT
Analog
IV amplifier output
7
GND
Supply
Ground, power supply
8
VREF
Analog
Reference voltage input
9
PDIN
Analog
Photo-diode input
10
RTIA
Analog
External resistor defining transimpedance IOUTA
11
RTIB
Analog
External resistor defining transimpedance IOUTB
12
RTIC
Analog
External resistor defining transimpedance IOUTC
13
VCCC
Supply
+5V to +9V power supply for IOUTC
14
IOUTC
Analog
Output current source C for laser diode
15
VCCB
Supply
+5V to +9V power supply for IOUTB
16
IOUTB
Analog
Output current source B for laser diode
17
VCCA
Supply
+5V to +9V power supply for IOUTA
18
IOUTA
Analog
Output current source A for laser diode
19
GND
Supply
Ground, power supply
20
RF
Analog
External resistor to GND; sets frequency of oscillator
21
RSA
Analog
External resistor to GND; sets swing of oscillator A
22
RSB
Analog
External resistor to GND; sets swing of oscillator B
23
RSC
Analog
External resistor to GND; sets swing of oscillator C
24
IR
Analog
Input current bias; ∼500Ω to ground
Paddle
GND
Supply
-
3
4923CS–DVD–02/08
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.
Parameters
Pin
Symbol
Value
Unit
Supply voltage
VVCCS
–0.5 to +6.0
V
Supply voltage output stages
(VCCA, VCCB, VCCC)
VVCCH
–0.5 to +9.5
V
Input voltage
VPDIN
–0.5 to Vcc+0.5
V
|0.5|
V
Differential voltage
8, 9
Vdiff_8,9
0.7
(1)
to 1
(2)
W
Power dissipation
Pmax
Output voltage
Vout
–0.5 to Vcch–1
V
Junction temperature
Tj
150
°C
Storage temperature
Tstg
–65 to +125
°C
Symbol
Value
Unit
RthJA
50(1)
K/W
Notes:
1. RthJA ≤ 115 K/W at Tamb = 70°C
2. RthJA ≤ 115 K/W at Tamb = 25°C
Electrostatic sensitive device.
Observe precautions for handling.
4. Thermal Resistance
Parameters
Junction ambient
Note:
1.
Measured with multi-layer test board (JDEC standard)
5. Recommended Operating Conditions
Parameters
Symbol
Value
Unit
Supply voltage
VVCCS
4.5 to 5.5
V
High supply voltage (VCCA, VCCB, VCCC)
VVCCH
VVCCS to 9.0
V
IIR
<2
mA
VPDOUT
0.8 to (VVCCS – 1.8)
V
RF
>3
kΩ
RS1, RS2, RS3
> 100
Ω
Tamb
0 to +70
°C
Transimpedance resistor
RTI
1 to 50
kΩ
Total capacitance at PDIN
CPD
< 15
pF
Load resistance
RLoad
>5
kΩ
Load capacitance
CLoad
< 30
pF
Reference voltage
VREF
1.6 to 3.0
V
Input current
Output voltage range
External resistor to GND to set oscillator frequency
External resistor to GND to set oscillator swing
Operating temperature range
4
ATR0885 [Preliminary]
4923CS–DVD–02/08
ATR0885 [Preliminary]
6. Ordering Information
Extended Type Number
ATR0885-PFQW
Package
Remarks
Green QFN24 (4 mm × 4 mm)
Taped and reeled
7. Package Information
Package: QFN 24 - 4 x 4
Exposed pad 2.6 x 2.6
(acc. JEDEC OUTLINE No. MO - 220)
Dimensions in mm
Not indicated tolerances ±0.05
0.9±0.1
4
+0
2.6
0.05-0.05
24
19
1
24
18
6
1
13
6
12
technical drawings
according to DIN
specifications
7
0.5 nom.
2.5
Drawing-No.: 6.543-5101.02-4
Issue: 1; 03.06.05
8. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No.
History
4923CC-DVD-02/08
• Put datasheet in a new template
• Pin Description table (page 3): Function of Pin 2 and 3 changed
5
4923CS–DVD–02/08
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4923CS–DVD–02/08