advanced sp8107 rev 0.1 09/08/04 sp8107 ? three channel laser driver ?copyright 2003 sipex corporation sipex reserves the right to make changes to this datasheet. call for updates: 1-978-667-8700. sipex confidential, advanced & prop rietary. do not distribute or copy page 1 of 6 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ir i2 i3 rf en2 en3 enable oscen vcc iout a gnd rsa rsb iout b sela vcc sp8107 qsop-16 features ? three current controlled inputs with independent enable/disable ? two selectable outputs for grounded laser diodes ? output current up to 400ma (250ma per input channel) ? independent swing for each output channel controlled by external resistor ? on-chip oscillator with resi stor controlled frequency ? single 5v power supply ? common enable and oscillator enable inputs ? ttl/cmos logic level control signals ? small qsop16 package application ? dvd-ram with cd-rw capability ? dvd-rw with cd-rw capability ? writable data storage optical devices general description the sp8107 is a three channel laser diode driver specifically designed for high speed dvd-rw or dvd- ram applications. it operates two grounded l aser diodes (650nm for dvd and 780nm for cd) and features three input channels that allow setting of th ree different optical power levels. the first channel (ir) has lower gain (100ma/ma) and output current (up to 200ma) and is used as a read channel. the second (i2) and third (i3) channels ha ve higher gain (250ma/ma) and out put current (up to 250ma) and are used as write channels. each write channel may be switched on/off at very fast switching speeds with ttl/cmos logic level signals applied to en2 and en3 inputs - channels are enabled at low logic level and disabled at high logic level. outputs of all cha nnels are summed together and connected to one of the outputs i out a or i out b depending on logic signal at the input sela. high logic level at sela selects output i out a, while low logic level selects output i out b. inputs ir, i2, and i3 are current-controlled with 200 ohm dc impedance but allow voltage cont rol by using external limiting resistors. an on-chip oscillator is used to reduce laser mode hoppi ng in read mode. the frequency of this oscillator may be changed by an external resist or connected to the rf pin. oscillator swing can be set separately for i out a and i out b outputs by two resistors connected to rsa and rsb pins respectively. the oscillator is enabled by high logic level at the oscen pin. low logic level at the enable pin disables the entire device. supply current in disabled mode is below 100ua. pins en2 and en3 have inte rnal pull-up resistors. pins enable, oscen, and sela have internal pull-down resistors. three channel high performance laser driver
advanced sp8107 rev 0.1 09/08/04 sp8107 ? three channel laser driver copyright 2003 sipex corporation sipex reserves the right to make changes to this datasheet. call for updates: 1-978-667-8700. sipex confidential, advanced & prop rietary. do not distribute or copy page 2 of 6 sp8107 schematic diagram absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. supply voltage (vcc)?????...-0.5v to 6.0v input voltage at any input?.-0.6v to vcc +0.5v power dissipation (pmax)???.?0.7 to 1w* output voltage (vout))????..-0.5 to vcc - 1 storage temperature???...-65 q c to +125 q c junction temperature???????..+150 q c *) 0.7w at tamb=70 0 c and 1w at tamb=25 o c recommended operating conditions supply voltage (vcc)???????...4.5v to 5.5v input current (ir, i2, i3)????????<2.0ma 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???-40 q c to 85 q c iout a iout b sela rf rsa rsb oscen read channel channel 2 channel 3 oscillator ir enable i2 en2 i3 en3
advanced sp8107 rev 0.1 09/08 /04 sp8107 ? three channel laser driver copyright 2003 sipex corporation sipex reserves the right to make changes to this datasheet. call for updates: 1-978-667-8700. sipex confidential, advanced & prop rietary. do not distribute or copy page 3 of 6 electrical specifications unless otherwise noted tamb=25 o c. all logic inputs are ttl/cmos compatible. parameters test conditions unit min. typ. max. supply current, power down enable=0v, en2=en3=0v ma 0.6 1.0 supply current, read mode, oscillator disabled ir=500ua, en2=en3=5v oscen=0v ma 80 100 supply current, read mode, oscillator enabled, output a selected ir=500ua, en2=en3=5v oscen=5v, rsa=8.2k rf=6.8k ma 93 105 supply current, write mode ir=500ua, i2=i3=200ua ma 180 225 supply current, input off ir=i2=i3=0ua en2=en3=0v ma 14 22 vcc shutdown voltage v 2.4 en2/en3 low voltage v 0.8 en2/en3 high voltage v 2.4 sela low voltage v 0.8 sela high voltage v 2.4 enable low voltage v 0.8 enable high voltage v 2.7 oscen low voltage v 0.8 oscen high voltage v 2.4 en2/en3 low current en=0v ua -200 en2/en3 high current en=5v ua 200 sela low current sela=0v ua -50 sela high current sela=5v ua 150 enable low current enable=0v ua -100 enable high current enable=5v ua 100 oscen low current oscen=0v ua -100 oscen high current oscen=5v ua 200 total output current output is sourcing ma 400 output current each write channel output is sourcing ma 250 best fit current gain read channel i in =200, 400, 600 ua (1) 100 best fit current gain write channel i in =80, 160, 240 ua (1) 250 output current linearity read channel write channel 2 write channel 3 i in =200, 400, 600 ua (1) i in =80, 160, 240 ua (1) i in =80, 160, 240 ua (1) % -3 3 input current range input is sinking ua 0 2000 output current read channel output is sourcing ma 150 ir, i2, i3 input impedance rin is to gnd ohm 100 200 300 output current off, mode 1 enable=0v ma 1 output current off, mode 2 enable=5v, en2=en3=5v ir=0ua, i2=i3=200ua ma 1 output current off, mode 3 enable=5v, en2=en3=0v ir=i2=i3=0ua ma 5 i out sensitivity to vcc, read mode i out =40ma read mode vcc=5v10% %/v -4 4 i out sensitivity to vcc, write mode i out =80ma, 40ma read + 40ma write %/v -4 4
advanced sp8107 rev 0.1 09/08 /04 sp8107 ? three channel laser driver copyright 2003 sipex corporation sipex reserves the right to make changes to this datasheet. call for updates: 1-978-667-8700. sipex confidential, advanced & prop rietary. do not distribute or copy page 4 of 6 parameters test conditions unit min. typ. max. vcc=5v10% i out current output noise i out =40ma oscen=0v na/ ? ?
advanced sp8107 rev 0.1 09/08 /04 sp8107 ? three channel laser driver copyright 2003 sipex corporation sipex reserves the right to make changes to this datasheet. call for updates: 1-978-667-8700. sipex confidential, advanced & prop rietary. do not distribute or copy page 5 of 6 pin assignments pin number pin name pin function 1 ir read channel current controlled input 2 i2 write channel 2 current controlled input 3 i3 write channel 3 current controlled input 4 rf connection of an external resistor to gnd to set oscillator frequency 5 en2 write channel 2 enable input with an internal pull-up resistor. logic high or floating turns channel off. 6 en3 write channel 3 enable input with an internal pull-up resistor. logic high or floating turns channel off. 7 enable common device enable input with pull-down resistor. logic low or floating turns device off. 8 oscen oscillator enable input with pull-do wn resistor. logic low or floating turns oscillator off. 9 vcc supply voltage. bypass to gnd with 0.1uf ceramic capacitor 10 sela output select input with pull-down resistor. logic high selects output a, low or floating selects output b 11 i out b output current source b for a laser diode 12 rsb connection of an external resistor to gnd to set oscillator swing at the output b 13 rsa connection of an external resistor to gnd to set oscillator swing at the output a 14 gnd ground pin 15 i out a output current source a for a laser diode 16 vcc supply voltage. bypass to gnd with ceramic capacitors 0.1 and 0.01uf in parallel board layout and grounding to obtain the best performance from the sp8107, a printed circuit board with ground plane is required. layout should ensure that analog signal lines (ir, i2, and i3) are separated as much as possible from digital and output power lines. output power lines s hould be as short and wide as possible. high quality, low series resistance ceramic 0.1 and 0.01uf bypass cap acitors should be used at the vcc pins 9 and 16. these capacitors must be located as close to the pins as possible. the traces connecting the pins and the bypassing capacitors must be kept short a nd should be made as wide as possible.
advanced sp8107 rev 0.1 09/08 /04 sp8107 ? three channel laser driver ?copyright 2003 sipex corporation sipex reserves the right to make changes to this datasheet. call for updates: 1-978-667-8700. sipex confidential, advanced & prop rietary. do not distribute or copy page 6 of 6 ordering information part number temperature range package type sp8107eh -40 to +85 0 c 16-pin qsop
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