rev. 4724es?dvd?01/04 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 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 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 chan- nels 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 refer- ence 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 atr0808 summary
2 atr0808 4724es?dvd?01/04 figure 1. block diagram channel 3 channel 2 i3 ne3 i2 ne2 read channel rf oscillator ir enosc enable rsa iouta ioutb rf rsb sela
3 atr0808 4724es?dvd?01/04 pin configuration sso16 figure 2. pinning sso16 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ir i2 i3 rf ne2 ne3 enable enosc vcc1 iouta gnd rsa rsb ioutb sela vcc2 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 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
4 atr0808 4724es?dvd?01/04 pin configuration qfn16 figure 3. pinning qfn16 i3 rf ne2 ne3 gnd rsa rsb ioutb i2 ir vcc1 iouta enable enosc vcc2 sela 16 15 14 13 5 6 7 8 1 2 3 4 12 11 10 9 pin description 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
5 atr0808 4724es?dvd?01/04 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 v cc -0.5 to +6.0 v input voltage at any input v in -0.5 to v cc +0.5 v power dissipation p max 0.7 (1) to 1 (2) w output voltage v out -0.5 to v cc -1 v junction temperature t j 150 c storage temperature t stg -65 to +125 c notes: 1. r thja 115 k/w at t amb = 70c 2. r thja 115 k/w at t amb = 25c thermal resistance parameters symbol value unit junction ambient r thja 115 (1) k/w note: 1. measured with multi-layer test board (jedec standard) recommended operating conditions parameters symbol value unit supply voltage v cc 4.5 to 5.5 v input current i ir , i i2 , i i3 i ir < 2.0, i i2 = i i3 < 1.5 ma external resistor to gnd to set oscillator frequency rf > 3 k ? external resistor to gnd to set oscillator swing rsa, rsb > 1 k ? operating temperature range t amb 0 to +70 c
6 atr0808 4724es?dvd?01/04 package sso16 ordering information extended type number package remarks atr0808-tcqg pb-free sso16 taped and reeled ATR0808-PEQG pb-free qfn16 (4 mm x 4 mm) taped and reeled
7 atr0808 4724es?dvd?01/04 package qfn16 (4 mm x 4 mm)
printed on recycled paper. disclaimer: atmel corporation makes no warranty for the use of its products, other than those expressly contained in the company?s standar d warranty which is detailed in atmel?s terms and conditions located on the company?s web site. the company assumes no responsibi lity for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time wi thout notice, and does not make any commitment to update the information contained her ein. no licenses to patents or other intellectual property of atmel are granted by the company in connection with the sale of atmel produc ts, expressly or by implication. atmel?s products are not aut horized for use as critical components in life support devices or systems. atmel corporation atmel operations 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 memory 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 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 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 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 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 literature requests www.atmel.com/literature 4724es?dvd?01/04 ? atmel corporation 2004 . all rights reserved. atmel ? and combinations thereof are the registered tradem arks of atmel corporation or its subsidiaries. other terms and product names may be the trademarks of others.
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