Features • • • • • • • • • • • • • Current-controlled Output Current Source, 3 Input Channels Two Selectable Outputs for Grounded Laser Diodes Output Current per Channel up to 250 mA Total Output Current to 300 mA (Minimum) Rise Time 1.0 ns, Fall Time 1.1 ns On-chip RF Oscillator Control of 2 Different Swings by Use of 2 external Resistors Oscillator Frequency Range from 200 MHz to 600 MHz Oscillator Swing to 100 mA Single 5 V Power Supply Common Enable/Disable Input TTL/CMOS Control Signals Small PB-free QFN16 (4 mm × 4 mm) or SSO16 Package 3-Channel Laser Driver with RF Oscillator and 2 Outputs Applications • DVD-ROM with CD-RW Capability (Combo Drives) • Combo Drives with CD and DVD Writing Capability Description T0806 The T0806 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RAM (650 nm) and CD-RW (780 nm) drives. 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 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 outputs IOUTA or IOUTB by the select input SELA. Each channel can contribute up to 250 mA to the total output current of up to 300 mA. A total gain of 100 is 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. Summary 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. Figure 1. Block Diagram I3 NE3 Channel 3 I2 NE2 Channel 2 IR ENABLE ENOSC IOUTA IOUTB Read channel RF oscillator RF RSA RSB SELA Rev. 4522ES–DVD–01/04 Pin Configuration Figure 2. Pinning SSO16 IR 1 16 VCC1 I2 2 15 IOUTA I3 3 14 GND RF 4 13 RSA NE2 5 12 RSB NE3 6 11 IOUTB ENABLE 7 10 SELA ENOSC 8 9 VCC2 T0806 Pin Description SSO16 2 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 RF Analog External resistor to GND sets oscillator frequency of oscillator A 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 T0806 4522ES–DVD–01/04 T0806 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 QFN16 Pin Symbol Type Function 1 I3 Analog Input current, bias voltage approximately GND 2 RF Analog External resistor to GND sets oscillator frequency 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 IOUT and circuit 15 IR Analog Input current, bias voltage approximately GND 16 I2 Analog Input current, bias voltage approximately GND Paddle GND Supply Ground 3 4522ES–DVD–01/04 Absolute Maximum Ratings Parameters Symbol Value Unit Supply voltage VCC –0.5 to +6.0 V Input voltage at IR, I2, I3 VIN1 –0.5 to +1.0 V Input voltage at NE2, NE3, ENOSC VIN2 –0.5 to VCC +0.5 V Output voltage VOUT –0.5 to VCC –1 V Total output current IOUT 350 mA IOUT (IR, I2, I3) 300 mA PMAX 0.7 (1) to 1 (2) W TJ 150 °C TStg –65 to +125 °C Symbol Value Unit RthJA 135 K/W Symbol Value Unit VCC 4.5 to 5.5 V IIR/II2/II3 < 3.0 mA RF >3 kΩ RSA, RSB >1 kΩ Tamb 0 to +70 °C Output current per channel Power dissipation Junction temperature Storage temperature range Notes: 1. RthJA ≤115 K/W, Tamb = 70° C 2. RthJA ≤115 K/W, Tamb = 25° C Thermal Resistance Parameters Junction ambient Recommended Operating Conditions Parameters Supply voltage range Input current External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range Ordering Information Extended Type Number T0806-TCQ T0806-PEQG 4 Package Remarks SSO16 Taped and reeled Pb-free QFN16 (4 mm × 4 mm) Taped and reeled T0806 4522ES–DVD–01/04 T0806 Package Information 5 4522ES–DVD–01/04 6 T0806 4522ES–DVD–01/04 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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