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| 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 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 x 4 mm) or SSO16 Package Applications * * * * DVD-ROM with CD-RW Capability DVD+RW with CD-RW Capability DVD-RW with CD-RW Capability Writable Optical Drives Three Channel Laser Driver with RF Oscillator and Two Outputs 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 channels 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 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. Rev. 4724ES-DVD-01/04 Figure 1. Block Diagram I3 NE3 Channel 3 IOUTA IOUTB Channel 2 I2 NE2 IR ENABLE Read channel ENOSC RF oscillator RF RSA RSB SELA 2 ATR0808 4724ES-DVD-01/04 ATR0808 Pin Configuration SSO16 Figure 2. Pinning SSO16 IR I2 I3 RF NE2 NE3 ENABLE ENOSC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC1 IOUTA GND RSA RSB IOUTB SELA VCC2 Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol IR I2 I3 RF NE2 NE3 ENABLE ENOSC VCC2 SELA IOUTB RSB RSA GND IOUTA VCC1 Type Analog Analog Analog Analog Digital Digital Digital Digital Supply Digital Analog Analog Analog Supply Analog Supply Function 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) Enables RF oscillator (high active) +5 V power supply for IOUT High: selects IOUTA, RSA Low: selects IOUTB, RSB 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 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 I3 RF NE2 NE3 1 2 3 4 16 15 14 13 12 11 10 9 5678 ENABLE ENOSC VCC2 SELA I2 IR VCC1 IOUTA GND RSA RSB IOUTB Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Paddle Symbol I3 RF NE2 NE3 ENABLE ENOSC VCC2 SELA IOUTB RSB RSA GND IOUTA VCC1 IR I2 GND Type Analog Analog Digital Digital Digital Digital Supply Digital Analog Analog Analog Supply Analog Supply Analog Analog Supply Function 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) +5 V power supply for IOUT High: selects IOUTA, RSA Low: selects IOUTB, RSB 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 Output current source A for laser diode +5 V power supply for circuit Input current, bias voltage approximately GND Input current, bias voltage approximately GND Ground 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 Supply voltage Input voltage at any input Power dissipation Output voltage Junction temperature Storage temperature Notes: 1. RthJA 115 K/W at Tamb = 70C 2. RthJA 115 K/W at Tamb = 25C Symbol VCC Vin Pmax Vout Tj Tstg Value -0.5 to +6.0 -0.5 to VCC +0.5 0.7 (1) Unit V V W V C C to 1 (2) -0.5 to VCC -1 150 -65 to +125 Thermal Resistance Parameters Junction ambient Note: Symbol RthJA Value 115 (1) Unit K/W 1. Measured with multi-layer test board (JEDEC standard) Recommended Operating Conditions Parameters Supply voltage Input current External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range Symbol VCC IIR, II2, II3 RF RSA, RSB Tamb Value 4.5 to 5.5 IIR < 2.0, II2 = II3 < 1.5 >3 >1 0 to +70 Unit V mA k k C 5 4724ES-DVD-01/04 Ordering Information Extended Type Number ATR0808-TCQG ATR0808-PEQG Package Pb-free SSO16 Pb-free QFN16 (4 mm x 4 mm) Remarks Taped and reeled Taped and reeled Package SSO16 6 ATR0808 4724ES-DVD-01/04 ATR0808 Package QFN16 (4 mm x 4 mm) 7 4724ES-DVD-01/04 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 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 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 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 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 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 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 ASIC/ASSP/Smart Cards 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 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 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. (c) Atmel Corporation 2004. All rights reserved. Atmel (R) 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. 4724ES-DVD-01/04 |
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