Features • • • • • • • • • • • • Current-controlled Output Current Source with 4 Input Channels Two Selectable Outputs for Grounded Laser Diodes Up to 350 mA Output Current per Channel Total Output Current up to 500 mA On-chip RF Oscillator Oscillator Frequency Range from 200 MHz to 500 MHz Individual Setting of RF Oscillator Current on Each Output by External Resistors Maximum Oscillator Current Amplitude 100 mA Single 5 V Power Supply Common Enable/Disable Input TTL/CMOS Compatible Control Signals Small Pb-free QFN20 or SSO20 Package Applications • • • • DVD-ROM with CD-RW Capability DVD+RW with CD-RW Capability DVD-RW with CD-RW Capability Magneto-optical Drives and Others Description ATR0809 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RW/+RW (650 nm) and CD-RW (780 nm). It includes four channels for four different optical power levels. All channels (channel 1 = read channel, channel 2, 3, 4 = write channels) can be controlled by fast switches. The 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 write channel (channel 2, 3 and 4) can contribute up to 350 mA to the total output current of up to 500 mA. The read channel can contribute up to 150 mA. Total gains of 100 (read channel), 250 (channel 2 and 3) and 100 (channel 4) are provided between each reference current input and the selected output. Although the reference inputs are current inputs, voltage control is also possible by using external resistors. An on-chip RF oscillator can be used to reduce laser mode hopping noise in read mode. The oscillator current amplitude and frequency can be set independently for the two selectable outputs with four different resistors. Oscillation is enabled by a high signal at the ENOSC pin. Complete shutdown of the output currents is achieved by a low signal at the ENABLE input. Four Channel Laser Driver with RF Oscillator and Two Outputs ATR0809 Summary Rev. 4792BS–DVD–05/04 Figure 1. Block Diagram I4 NE4 Channel 4 I3 NE3 I2 NE2 IR NER ENABLE ENOSC Channel 3 IOUTA IOUTB Channel 2 Channel 1 Read channel RF oscillator RFA RSA RFB RSB 2 SELA ATR0809 4792BS–DVD–05/04 ATR0809 Pin Configuration SSO20 Figure 2. Pinning SSO20 IR I2 I3 I4 RFA RFB NER NE2 NE3 NE4 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC ENABLE IOUTA GND RSA RSB IOUTB SELA VCC ENOSC Pin Description 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 I4 Analog Input current, bias voltage approximately GND 5 RFA Analog External resistor to GND sets frequency of oscillator A 6 RFB Analog External resistor to GND sets frequency of oscillator B 7 NER Digital Digital control of channel 1 (read, active low) 8 NE2 Digital Digital control of channel 2 (active low) 9 NE3 Digital Digital control of channel 3 (active low) 10 NE4 Digital Digital control of channel 4 (active low) 11 ENOSC Digital Enables RF oscillator (active high) 12 VCC Supply 5 V power supply 13 SELA Digital High: selects IOUTA, RSA, RFA Low: selects IOUTB, RSB, RFB 14 IOUTB Analog Output current source B for laser diode 15 RSB Analog External resistor to GND sets swing of oscillator B 16 RSA Analog External resistor to GND sets swing of oscillator A 17 GND Supply Ground 18 IOUTA Analog Output current source A for laser diode 19 ENABLE Digital Enables output current (active high) 20 VCC Supply 5 V power supply 3 4792BS–DVD–05/04 Pin Configuration QFN20 I3 I2 IR VCC ENABLE Figure 3. Pinning QFN20 1 2 3 4 5 20 19 18 17 16 15 14 13 12 11 6 7 8 9 10 IOUTA GND RSA RSB IOUTB NE3 NE4 ENOSC VCC SELA I4 RFA RFB NER NE2 Pin Description 4 Pin Symbol Type Function 1 I4 Analog Input current, bias voltage approximately GND 2 RFA Analog External resistor to GND sets frequency of oscillator A 3 RFB Analog External resistor to GND sets frequency of oscillator B 4 NER Digital Digital control of channel 1 (read, active low) 5 NE2 Digital Digital control of channel 2 (active low) 6 NE3 Digital Digital control of channel 3 (active low) 7 NE4 Digital Digital control of channel 4 (active low) 8 ENOSC Digital Enables RF oscillator (active high) 9 VCC Supply 5 V power supply 10 SELA Digital High: selects IOUTA, RSA, RFA Low: selects IOUTB, RSB, RFB 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 ENABLE Digital Enables output current (active high) 17 VCC Supply 5 V power supply 18 IR Analog Input current, bias voltage approximately GND 19 I2 Analog Input current, bias voltage approximately GND 20 I3 Analog Input current, bias voltage approximately GND ATR0809 4792BS–DVD–05/04 ATR0809 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 Value Unit Supply voltage VCC -0.5 to +6.0 V Input voltage at any input Vin -0.5 to VCC +0.5 V Power dissipation Pmax Output voltage 0.7 (1) (2) to 1 W Vout -0.5 to VCC -1 V Junction temperature Tj 150 °C Storage temperature Tstg -65 to +125 °C Symbol Value Unit Notes: 1. RthJA ≤115 K/W at Tamb = 70°C 2. RthJA ≤115 K/W at Tamb = 25°C Thermal Resistance Parameters Junction case RthJC 27 K/W Junction ambient RthJA 125(1) K/W Symbol Value Unit Note: 1. Measured with multi-layer test board (JEDEC standard) Recommended Operating Conditions Parameters VCC 4.5 to 5.5 V IIR, II2, II3, II4 < 2.5 mA External resistor to GND to set oscillator frequency RFA, RFB >3 kΩ External resistor to GND to set oscillator swing RSA, RSB >1 kΩ Tamb 0 to +70 °C Supply voltage Input current Operating temperature range 5 4792BS–DVD–05/04 Ordering Information Extended Type Number Package Remarks ATR0809-TKQG PB-free SSO20 Taped and reeled ATR0809-PRQG PB-free QFN20 (4 mm x 4 mm) Tuped and reeled Package Information 5.7 5.3 Package SSO20 Dimensions in mm 6.75 6.50 4.5 4.3 1.30 0.15 0.05 0.25 0.65 5.85 20 0.15 6.6 6.3 11 technical drawings according to DIN specifications 1 6 10 ATR0809 4792BS–DVD–05/04 ATR0809 7 4792BS–DVD–05/04 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. 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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. 4792BS–DVD–05/04