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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 x 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
3-output Laser Driver for HD-DVD/ Blu-ray/DVD/ CD-ROM ATR0885 Preliminary Summary
1. Description
ATR0885 is a laser diode driver designed to operate three different grounded or floating laser diodes for reading CDs ( = 780 nm), DVDs ( = 6 50 nm ), a nd HD-DVDs/Blu-ray ( = 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.
Rev. 4923AS-DVD-02/06
Note: This is a summary document. For more information please contact your local Atmel sales office.
Figure 1-1.
Block Diagram
RTIA RTIB RTIC PDIN VREF
Transimpedance amplifier
PDOUT
IR
Read channel
Block enable
VCCA IOUTA VCCB IOUTB VCCC IOUTC
SEL2 SEL1
Logic
ENOSC
RF oscillator
2. Pin Configuration
Figure 2-1. Pinning QFN24
IR RSC RSB RSA RF GND
GND SEL1 SEL2 ENOSC VCCS PDOUT
1 2 3 4 5 6
24 23 22 21 20 19 18 17 16 15 14 78 13 9 10 11 12
2
ATR0885 [Preliminary]
4923AS-DVD-02/06
GND VREF PDIN RTIA RTIB RTIC
RF RSA RSB RSC
IOUTA VCCA IOUTB VCCB IOUTC VCCC
ATR0885 [Preliminary]
Table 2-1.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Paddle
Pin Description
Symbol GND SEL1 SEL2 ENOSC VCCS PDOUT GND VREF PDIN RTIA RTIB RTIC VCCC IOUTC VCCB IOUTB VCCA IOUTA GND RF RSA RSB RSC IR GND Type Supply Digital Digital Digital Supply Analog Supply Analog Analog Analog Analog Analog Supply Analog Supply Analog Supply Analog Supply Analog Analog Analog Analog Analog Supply Function Ground, power supply Logic pin 2 to select IOUT/ENABLE IC Logic pin 1 to select IOUT/ENABLE IC Digital control of RF oscillator +5V power supply for internal circuit IV amplifier output Ground, power supply Reference voltage input Photo-diode input External resistor defining transimpedance IOUTA External resistor defining transimpedance IOUTB External resistor defining transimpedance IOUTC +5V to +9V power supply for IOUTC Output current source C for laser diode +5V to +9V power supply for IOUTB Output current source B for laser diode +5V to +9V power supply for IOUTA Output current source A for laser diode Ground, power supply External resistor to GND; sets frequency of oscillator External resistor to GND; sets swing of oscillator A External resistor to GND; sets swing of oscillator B External resistor to GND; sets swing of oscillator C 500 to ground Input current bias; -
3
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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 Supply voltage Supply voltage output stages (VCCA, VCCB, VCCC) Input voltage Differential voltage Power dissipation Output voltage Junction temperature Storage temperature Notes: 1. RthJA 115K/W at Tamb = 70 C 2. RthJA 115K/W at Tamb = 25 C 8, 9 Pin Symbol VVCCS VVCCH VPDIN Vdiff_8,9 Pmax Vout Tj Tstg 0.7 Value -0.5 to +6.0 -0.5 to +9.5 -0.5 to Vcc+0.5 |0.5|
(1)
Unit V V V V
(2)
to 1
W V C C
-0.5 to Vcch-1 150 -65 to +125
4. Thermal Resistance
Parameters Junction ambient Note: 1. Symbol RthJA Measured with multi-layer test board (JDEC standard) Value 50
(1)
Unit K/W
5. Recommended Operating Conditions
Parameters Supply voltage High supply voltage (VCCA, VCCB, VCCC) Input current Output voltage range External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range Transimpedance resistor Total capacitance at PDIN Load resistance Load capacitance Reference voltage Symbol VVCCS VVCCH IIR VPDOUT RF RS1, RS2, RS3 Tamb RTI CPD RLoad CLoad VREF Value 4.5 to 5.5 VVCCS to 9.0 <2 0.8 to (VVCCS - 1.8) >3 > 100 0 to +70 1 to 50 < 15 >5 < 30 1.6 to 3.0 Unit V V mA V k C k pF k pF V
4
ATR0885 [Preliminary]
4923AS-DVD-02/06
ATR0885 [Preliminary]
6. Ordering Information
Extended Type Number ATR0885-PFQW Package Green QFN24 (4 mm x 4 mm) Remarks 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 0.90.1
+0
4 2.6
0.05-0.05 24 1
18 19
24 1
technical drawings according to DIN specifications
6
13 12 7
6
0.5 nom. Drawing-No.: 6.543-5101.02-4 Issue: 1; 03.06.05 2.5
5
4923AS-DVD-02/06
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4923AS-DVD-02/06

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