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features ? current-controlled output current source with 5 input channels 2 selectable outputs fo r grounded laser diodes output current per channel up to 200 ma total output current up to 250 ma rise time 1.0 ns/fall time 1.1 ns on-chip rf oscillator control of 2 different frequencies and sw ings by use of 4 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 sso24 package and qfn28 package applications combo drives (dvd + cd-rw) dvd-ram with cd-rw capability dvd-rw with cd-rw capability 1. description the t0800 is a laser diode driver for the operation of two different, grounded laser diodes for dvd-ram (650 nm) and cd-rw (780 nm). it includes five channels for five different optical power levels which are controlled by a separate ic. the read channel generates a continuous output level. the channels 2 to 5 are provided as write chan- nels with very fast switching speeds. when a low signal is applied to the ne pins, write current pulses are enabled. all channels are summed together and switched to one of the two outputs iouta or ioutb by the select input sela. each channel can contrib- ute up to 200 ma to the total output current of up to 250 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 resis- tors. an on-chip rf oscillator reduc es laser mode hopping noise during read mode. frequency and swing can be set independently for the two selectable outputs with two pairs of resistors. osc illation is enabled by a high signal at the enosc pin. complete output current and oscillator sw itch-off is achieved by a low signal at the enable input. 5-channel laser driver with rf oscillator and 2 outputs t0800 rev. 4503e?dvd?11/05
2 4503e?dvd?11/05 t0800 2. pin configuration figure 2-1. pinning sso24 ir i2 i3 i4 i5 rfa rfb ne2 ne3 ne4 ne5 enable vcc1 vcc2 iouta iouta gnd rsa rsb ioutb ioutb sela enosc vcc2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 table 2-1. pin description: sso24 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 i5 analog input current, bias voltage approximately gnd 6 rfa analog external resistor to gnd sets frequency of oscillator a 7 rfb analog external resistor to gnd sets frequency of oscillator b 8 ne2 digital digital control of channel 2 (low active) 9 ne3 digital digital control of channel 3 (low active) 10 ne4 digital digital control of channel 4 (low active) 11 ne5 digital digital control of channel 5 (low active) 12 enable digital enables output current (high active) 13 vcc2 supply +5v power supply for iout 14 enosc digital enables rf oscillator (high active) 15 sela digital high: selects iouta, rfa, rsa low: selects ioutb, rfb, rsb 16/17 ioutb analog output current source b for laser diode 18 rsb analog external resistor to gnd sets swing of oscillator b 19 rsa analog external resistor to gnd sets swing of oscillator a 20 gnd supply ground 21/22 iouta analog output current source a for laser diode 23 vcc2 supply +5v power supply for iout 24 vcc1 supply +5v power supply for circuit
3 4503e?dvd?11/05 t0800 figure 2-2. pinning qfn28 i4 i5 rfa rfb gnd ne2 ne3 iouta iouta gnd rsa rsb ioutb ioutb i3 i2 ir nc vcc1 vcc2 vcc2 ne4 ne5 enable vcc2 vcc2 enosc sela 28 27 26 25 24 23 22 8 9 10 11 12 13 14 1 2 3 4 5 6 7 21 20 19 18 17 16 15 table 2-2. pin description: qfn28 pin symbol type function 1 i4 analog input current, bias voltage approximately gnd 2 i5 analog input current, bias voltage approximately gnd 3 rfa analog external resistor to gnd sets frequency of oscillator a 4 rfb analog external resistor to gnd sets frequency of oscillator b 5 gnd supply ground 6 ne2 digital digital control of channel 2 (low active) 7 ne3 digital digital control of channel 3 (low active) 8 ne4 digital digital control of channel 4 (low active) 9 ne5 digital digital control of channel 5 (low active) 10 enable digital enables output current (high active) 11, 12 vcc2 supply +5v power supply iout 13 enosc digital enables rf oscillator (high active) 14 sela digital high: selects iouta, rfa, rsa low: selects ioutb, rfb, rsb 15 ioutb analog output current source b for laser diode 16 ioutb analog output current source b for laser diode 17 rsb analog external resistor to gnd sets swing of oscillator b 18 rsa analog external resistor to gnd sets swing of oscillator a 19 gnd supply ground 20 iouta analog output current source a for laser diode 21 iouta analog output current source a for laser diode 22, 23 vcc2 supply +5v power supply iout 24 vcc1 supply +5v power supply circuit 25 nc ? not connected 26 ir analog input current, bias voltage approximately gnd 27 i2 analog input current, bias voltage approximately gnd 28 i3 analog input current, bias voltage approximately gnd paddle ? ? should be connected with ground
4 4503e?dvd?11/05 t0800 figure 2-3. block diagram channel 3 channel 2 i3 ne3 i2 ne2 read channel rf oscillator ir enosc enable rfa rsa channel 4 channel 5 i4 ne4 ne5 i5 iouta ioutb rfb rsb sela
5 4503e?dvd?11/05 t0800 3. 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 t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . parameter symbol value unit supply voltage v cc ?0.5 to +6.0 v input voltage at ir, i2, i3, i4, i5 v in1 ?0.5 to +0.5 v input voltage at ne2, ne3, ne4, ne5, enosc v in2 ?0.5 to v cc +0.5 v output voltage v out ?0.5 to v cc ?1 v power dissipation p tot 0.7 (1) to 1 (2) w junction temperature t j 150 c storage temperature range t stg ?65 to +125 c notes: 1. r thja 115 k/w, t amb = 70c 2. r thja 115 k/w, t amb = 25c 4. thermal resistance parameter symbol value (1) unit junction ambient r thja 115 (sso24) 35 (qfn28) k/w k/w note: 1. measured with multi-layer test board (jedec standard jesd51-7) 5. recommended operating conditions parameter symbol value unit supply voltage range v cc 4.5 to 5.5 v input current i ir , i i2 , i i3 , i i4 , i i5 < 2.5 ma external resistor to gnd to set oscillator frequency rfa, rfb > 3 k ? external resistor to gnd to set oscillator swing rsa, rsb > 100 ? operating temperature range t amb 0 to +70 c
6 4503e?dvd?11/05 t0800 6. electrical characteristics v cc = 5v, t amb = 25c, enable = high, ne2 = ne3 = ne4 = ne5 = high, enosc = low, unless otherwise specified no. parameters test conditions pin (1) symbol min. typ. max. unit type* 1 power supply 1.1 supply current, power down enable = low, ne2 = ne3 = ne4 = ne5 = low 11,12, 22, 23, 24 icc pd2 0.5 ma a 1.2 supply current, read mode, oscillator disabled i ir = i i2 = i i3 = i i4 = i i5 = 500 a 11,12, 22, 23, 24 icc r1 115 ma a 1.3 supply current, read mode, oscillator enabled, output a selected i ir = i i2 = i i3 = i i4 = i i5 = 500 a, enosc = high, rs = 560 ? , rf = 7.5 k ? , sela = high 11,12, 22, 23, 24 icc r2 120 ma a 1.4 supply current, write mode i ir = i i2 = i i3 = i i4 = i i5 = 500 a, ne2 = ne3 = ne4 = ne5 = low 11,12, 22, 23, 24 icc w 320 ma a 1.5 supply current, input off i ir = i i2 = i i3 = i i4 = i i5 = 0 a 11,12, 22, 23, 24 icc off 18 ma a 2 digital inputs 2.1 ne2/ne3/ne4/ne5 low voltage 6, 7, 8, 9 vne lo 1.1 v a 2.2 ne2/ne3/ne4/ne5 high voltage 6, 7, 8, 9 vne hi 2.0 v a 2.3 sela low voltage 14 vsela lo 0.5 v a 2.4 sela high voltage 14 vsela hi 2.0 v a 2.5 enable low voltage 10 ven lo 0.5 v a 2.6 enable high voltage 10 ven hi 2.0 v a 2.7 enosc low voltage 13 veo lo 0.5 v a 2.8 enosc high voltage 13 veo hi 2.0 v a 3 currents at digital inputs 3.1 ne2/ne3/ne4/ne5 low current ne = 0v 6, 7, 8, 9 ine lo ?300 a a 3.2 ne2/ne3/ne4/ne5 high current ne = 5v 6, 7, 8, 9 ine hi 800 a a 3.3 sela low current sela = 0v 14 isela lo ?45 a a 3.4 sela high current sela = 5v 14 isela hi 150 a a 3.5 enable low current enable = 0v 10 ien lo ?150 a a 3.6 enable high current enable = 5v 10 ien hi 100 a a 3.7 enosc low current enosc = 0v 13 ieo lo ?100 a a 3.8 enosc high current enosc = 5v 13 ieo hi 800 a a *) type means: a = 100% tested, b = 100% correlation test ed, c = characterized on samples, d = design parameter note: 1. related to qfn28 package
7 4503e?dvd?11/05 t0800 7. electrical characterist ics: laser amplifier v cc = 5 v, t amb = 25c, enable = high, unless otherwise specified no. parameters test conditions pin symbol min. typ. max. unit type* 4 outputs iouta and ioutb 4.1 best fit current gain any channel (1) 15, 16, 20, 21 gain 90 100 130 ma/ma a 4.2 best fit current offset any channel (1) 15, 16, 20, 21 ios ?8 +4 ma a 4.3 output current linearity any channel (1) 15, 16, 20, 21 ilin ?3 +3 % a 4.5 output current per channel output is sourcing 15, 16, 20, 21 i outr 200 ma a 4.6 total output current 15, 16, 20, 21 i out 250 ma a 4.7 i in input impedance r in is to gnd 1, 2, 26, 27, 28 r in 170 220 270 ? a 4.8 ne threshold temperature stabilized 6, 7, 8, 9 vth 1.68 v c 4.9 output off current 1 enable = low 15, 16, 20, 21 ioff 1 1maa 4.10 output off current 2 ne2 = ne3 = ne4 = ne5 = high 15, 16, 20, 21 ioff 2 1maa 4.11 output off current 3 ne2 = ne3 = ne4 = ne5 = low, i ir = i i2 = i i3 = i i4 = i i5 = 0 a 15, 16, 20, 21 ioff 3 5maa 4.12 i out supply sensitivity, read mode i out = 40 ma, v cc = 5v 10%, read-only 15, 16, 20, 21 vse r ?5 1 %v a 4.13 i out supply sensitivity, write mode i out = 80 ma, 40 ma read + 40 ma write, v cc = 5v 10% 15, 16, 20, 21 vse w ?6 0 %v a 4.14 i out current output noise i out = 40 ma, enosc = low 15, 16, 20, 21 ino o 3 na/ rt-hz c 4.15 i out temperature sensitivity, read mode i out = 40 ma, read only 15, 16, 20, 21 tse r ?100 ppm/c c 4.16 i out temperature sensitivity, write mode i out = 80 ma, 40 ma read + 40 ma write 15, 16, 20, 21 tse w ?300 ppm/c c *) type means: a = 100% tested, b = 100% correlation test ed, c = characterized on samples, d = design parameter note: 1. linearity of the amplifier is calculated usi ng a best fit method at three operating points of i out at 20 ma, 40 ma, and 60 ma, i out = (i in gain) + i os
8 4503e?dvd?11/05 t0800 8. electrical characteristics v cc = 5v, i out = 40 ma dc with 40-ma pulse, t amb = 25c, unless otherwise specified no. parameters test conditions pi n symbol min. typ. max. unit type* 5 outputs iouta and ioutb, ac performance 5.1 write rise time i out = 40 ma (read) +40 ma (10%-90%) (1) 15, 16, 20, 21 t rise 1.0 3.0 ns c 5.2 write fall time i out = 40 ma (read) +40 ma (10%-90%) (1) 15, 16, 20, 21 t fall 1.1 3.0 ns c 5.3 output current overshoot i out = 40 ma (read) + 40 ma (1) 15, 16, 20, 21 os 5 % c 5.4 i out on prop delay ne 50% high-low to i out at 50% of final value 15, 16, 20, 21 t on 2.0 ns c 5.5 i off off prop delay ne 50% low-high to i out at 50% of final value 15, 16, 20, 21 t off 2.0 ns c 5.6 disable time enable 50% high-low to i out at 50% of final value 15, 16, 20, 21 t dis 20 ns c 5.7 enable time enable 50% low-high to i out at 50% of final value 15, 16, 20, 21 t en 20 ns c 5.8 disable time oscillator enosc 50% low-high to i out at 50% of final value 15, 16, 20, 21 t diso 4nsc 5.9 enable time oscillator enosc 50% high-low to i out at 50% of final value 15, 16, 20, 21 t eno 2nsc 5.10 sela delay sela low-high 50% to i out at 50% of final value 15, 16, 20, 21 t sah tbd ns c 5.11 sela delay sela high-low 50% to i out at 50% of final value 15, 16, 20, 21 t sal tbd ns c 5.12 amplifier bandwidth i out = 50 ma, all channels, ?3 db value 15, 16, 20, 21 bw lca 20 mhz c 6 oscillator 6.1 oscillator frequency rf = 4.7 k ? 15, 16, 20, 21 f osc 380 470 560 mhz a 6.2 oscillator temperature coefficient rf = 4.7 k ? 15, 16, 20, 21 tc osc ?150 ppm/c c 6.3 disable time oscillator enosc 50% high-low to i out , at 10%/90% of final value 15, 16, 20, 21 t diso 4nsc 6.4 enable time oscillator enosc 50% low-high to i out , at 10%/90% of final value 15, 16, 20, 21 t eno 2nsc *) type means: a = 100% tested, b = 100% correlation test ed, c = characterized on samples, d = design parameter
9 4503e?dvd?11/05 t0800 9. application information oscillator figure 9-1. frequency versus resistor rfa and rfb (rs = 525 ? ) figure 9-2. swing versus resistor rsa and rsb (rf = 7.82 k ? ) figure 9-3. frequency dependency of swing 200 250 300 350 400 450 500 550 4.0 5.0 6.0 7.0 8.0 9.0 10.0 rfa, rfb (k ? ) frequency (mhz) 0 20 40 60 80 100 120 0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 rsa, rsb ( ? ) swing (ma pk/pk) 0 10 20 30 40 50 60 200.0 250.0 300.0 350.0 400.0 450.0 500.0 frequency (mhz) swing (ma pk/pk)
10 4503e?dvd?11/05 t0800 figure 9-4. transfer characteristic of all channels (gain = 111) figure 9-5. output characteristic (voltage compliance) r(iout) = 5.8 ? figure 9-6. output pulse, read: 50 ma, write: 250 ma pk-pk 0 50 100 150 200 250 300 350 0.0 500.0 1000.0 1500.0 2000.0 2500.0 3000.0 ir/i2/i3/i4/i5 (ma) iout (ma) 0 50 100 150 200 250 300 350 0.0 1.0 2.0 3.0 4.0 5.0 vcc - v(iout)/v iout (ma)
11 4503e?dvd?11/05 t0800 figure 9-7. timing diagram of iout figure 9-8. application circuit enable ne2 iout tr tr tf tf t en tr tr tf tf ne3 ne4 ne5 t on t on t on t on t off t off t off t off t dis vcc ld ld a n a l o g d i g i t a l ir i2 i3 i4 i5 rfa rfb ne2 ne3 ne4 ne5 enable vcc1 vcc2 iouta iouta gnd rsa rsb ioutb ioutb sela enosc vcc2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 vcc
12 4503e?dvd?11/05 t0800 11. package information 10. ordering information extended type number package remarks t0800-tnqw sso24 taped and reeled, pb-free t0800-pjqw qfn28 taped and reeled, pb-free technical drawings according to din specifications package sso24 dimensions in mm 8.05 7.80 0.15 0.05 0.25 0.65 7.15 1.30 5.7 5.3 4.5 4.3 6.6 6.3 0.15 24 13 112
13 4503e?dvd?11/05 t0800
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