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 500 Ω 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 Description The ATR0807 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. Three Channel Laser Driver with RF Oscillator and Two Outputs ATR0807 (Summary) Rev. 4723CS–DVD–07/03 1 Figure 1. Block Diagram I3 NE3 Channel 3 I2 NE2 Channel 2 IR IOUTA IOUTB Read channel ENABLE ENOSC RF oscillator RF RSA RSB 2 SELA ATR0807 4723CS–DVD–07/03 ATR0807 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 Symbol Type 1 IR Analog Input current, bias voltage approximately GND Function 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 frequency of oscillator 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 3 4723CS–DVD–07/03 Pin Configuration QFN16 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 4 Pin Symbol Type Function 1 I3 Analog Input current, bias voltage approximately GND 2 RF Analog External resistor to GND sets frequency of oscillator 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 circuit 15 IR Analog Input current, bias voltage approximately GND 16 I2 Analog Input current, bias voltage approximately GND Paddle GND Supply Ground ATR0807 4723CS–DVD–07/03 ATR0807 Absolute Maximum Ratings 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 0.7 (1) to 1 (2) W Output voltage Vout -0.5 to VCC -1 V Junction temperature Tj 150 °C Storage temperature Tstg -65 to +125 °C Symbol Value Unit (1) K/W Symbol Value Unit VCC 4.5 to 5.5 V IIR, II2, II3 IIR < 2.0, II2 = II3 < 1.5 mA RF >3 kW RSA, RSB >1 kW Tamb 0 to +70 °C Notes: 1. RthJA £ 115 K/W at Tamb = 70°C 2. RthJA £ 115 K/W at Tamb = 25°C Thermal Resistance Parameters Junction ambient Notes: RthJA 115 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 5 4723CS–DVD–07/03 Ordering Information Extended Type Number Package Remarks ATR0807-TCQ Pb-free SSO16 Taped and reeled ATR0807-PEQ Pb-free QFN16 (4 mm x 4 mm) Taped and reeled Package SSO16 6 ATR0807 4723CS–DVD–07/03 ATR0807 Package QFN16 (4 mm x 4 mm) 7 4723CS–DVD–07/03 Atmel Headquarters Atmel Operations Corporate Headquarters Memory 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 487-2600 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 Tsimhatsui 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 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131 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 Zone Industrielle 13106 Rousset Cedex, France TEL (33) 4-42-53-60-00 FAX (33) 4-42-53-60-01 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. 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