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yss906 asr2p analog surround yamaha corporation yss906catalog catalog no.:lsi-4ss906a2 1998. 6 introduction yss906 is an lsi for processing signals that uses yamahas original wide surround technology, ymersion ? , and the tone control/loudness circuit that is built-in the device. this lsi has the following features. 1. in addition to normal stereophonic input signal processing function, this lsi uses the pseudo- stereophonic sound processing function to give listeners a feeling of extended sound field. 2. offers the wide surround effect by using ymersion ? technology. 3. use of tone control/loudness function can emphasize specific tones. when reproducing music in compact audio appliances such as the arcade game or other game applications, yss906 is particularly suited to meeting the need of adding a feeling of extended sound field or emphasizing specific bass or treble tones. this lsi does not require use of the microcomputer, a/d and d/a functions and memories because it uses analog signals without converting them to digital signal. features wide surround : surround function through the use of amplitude/phase conversion circuit tone control : bass (100 hz +/- 10 db), treble (10 khz +/- 10 db) (recommended ) loudness : -30db (recommended) note: either the tone control or loudness can be selected. other features : stereophonic/monaural enabling/disabling switch wide surround enabling/disabling switch wide control of wide surround tone control enabling/disabling switch bass/treble tone control every control is made through the voltage at pins. operating voltage: wide operating voltage from 3.0 to 5.5 v package : 20skdip (YSS906-N) process : silicon gate cmos process ymersion? is yamaha's registered trade mark.
yss906 - 2 - pin configuration 20 skdip (YSS906-N) 1 10 11 20 wl fol fcl wr for fcr sc2 sc1 ail air sw avdd avss vref aor tbr tar aol tbl tal pin function pin no. i/o pin name function 1 i wl 3d lch wide input 2 o fol 3d lch filter output 3 o fcl 3d lch capacitor 4 i wr 3d rch wide input 5 o for 3d rch filter output 6 o fcr 3d rch capacitor 7 o sc2 pseudo stereo filter capacitor 2 8 o sc1 pseudo stereo filter capacitor 1 9 i ail lch input 10 i air rch input 11 i sw pseudo stereo, 3d and tone control on/off input 12 avdd power supply 13 avss ground 14 o vref voltage reference 15 o aor rch output 16 i tbr rch tone control(b) 17 o tar rch tone control(a) 18 o aol lch output 19 i tbl lch tone control(b) 20 o tal lch tone control(a)
yss906 - 3 - description of pin function pin name (pin no.) function 1. wl (1) left channel wide surround input wr (4) right channel wide surround input the wide surround effect is obtained by inputting the signal from fol(no.2) and for(no.5) to wl and wr respectively after adjusting their output levels. 2. fol (2) left channel filter output refer to the above section. for (5) right channel filter output 3. fcl (3) left channel filter capacitor connection fcr (6) right channel filter capacitor connection a capacitor of 0.018 m f is to be connected between each of fcl to ground and fcr to ground. 4. sc2 (7) pseudo-stereophonic filter capacitor connection sc1 (8) pseudo-stereophonic filter capacitor connection a capacitor of 0.047 m f is to be connected between sc1 and ground. a capacitor of 0.0082 m f is to be connected between sc2 and ground. 5. ail(9) left channel analog signal input air(10) right channel analog signal input left channel signal is to be inputted to ail through a capacitor of 10 m f. right channel signal is to be inputted to air through a capacitor of 10 m f. 6. sw(11) stereophonic/monaural selection, wide surround and tone control a lead of the three resistors, 50 k w , 100 k w and 200 k w , is to be connected to this pin, and the other end of the parts is connected to either avdd or avss to on/off the function. when 50 k w , 100 k w and/or 200 k w resistor is connected to avdd, stereophonic / monaural selection, wide surround and/or tone control is enabled respectively, or when connected to avss, these functions are disabled accordingly. 7. avdd(12) power supply this pin applies voltage between +3.0 v and +5.5 v dc inclusive with respect to the potential of avss. a capacitor of 10 m f is to be connected between this pin and avss(13). 8. avss(13) ground provides a reference for avdd and analog signal. 9. vref(14) operating voltage outputs a voltage that is equal to the difference between the potentials at avdd and avss divided by 2, or (avdd - avss)/2, that is used as a reference voltage for the internal circuit of this lsi. a capacitor of 10 m f is to be connected between this pin and avss(13). 10. aor(15) right channel analog signal output aol(18) left channel analog signal output a capacitor is to be connected to aor and aol pins before outputting analog signals. 11. tbr(16) and tar(17) right channel tone control input tbl(19) and tal(20) left channel tone control input right channel tone control circuit is formed by connecting aor(15), tbr(16) and ta r(17) pins through a circuit that includes capacitors and resistors. left channel tone control circuit is formed by connecting aol(18), tbl(19) and tal(20) pins through a circuit that includes capacitors and resistors. (refer to the example of application presented in the next page.)
yss906 - 4 - block diagram flow diagram apf apf pseudo-stereo lpf lpf ymersion tone control tone control ail air aol aor fb fb -1 -1 -1 function diagram on/ off wide on/ off ail air aol aor on/ off wide on/ off loudness on/ off ail air aol aor on/ off bass treble pseudo-stereo+wide surround+tone control pseudo-stereo+wide surround+loudness pseudo stereo pseudo stereo wide surround wide surround tone control loudness example of application this section presents an example of application of yss906 that makes wide surround and tone controls through variable resistors. 200 in r in l 50 100 outr outl 100 43 20 50 43 100 43 20 50 10 0. 047 vdd (+ 5 v) gnd (0 v) 0. 022 100 6800pf 2200pf 2200pf 43 a recommended application of yss906 (asr2p) 10 10 10 10 0. 0082 0. 018 0. 018 gnd 10 10 0. 022 470 10 470 k k k k k kb f kb k k k k kb f f 6800pf kb kb f f f f f f f f kb f f gnd gnd gnd gnd gnd gnd yss906 can be made different characteristics with external components at various values.
yss906 - 5 - referential information for creating sounds 1. wide surround effect the characteristic of wide surround is determined by two types of capacitors, c1 and c2 (standard capacitors of 0.022 m f and 0.018 m f) that decide the response of the filter and a resistor (fixed or variable) that decides the amount of crosstalk. an equivalent circuit of wide surround function is as shown below. z filter c2 fcl fol wl =17 k 1/2vdd 10k fixed resistor variable resistor resistor pre-set the resistance determines the attenuation in amplitude of the signal outputted from fol before it is inputted to wl. smaller resistance make the effect of wide surround higher. the resistance of 0(zero) makes the amount of the crosstalk equal to the one obtained at maximum value of the variable resistor. the amount of the crosstalk can be determined based on the specific taste of the customer. however, higher crosstalk makes the amplitude of the out-phase component larger, thus the crosstalk higher than a certain level may make the sound unpleasant. it is recommended to set the crosstalk level in the range from -3 db to -10 db with respect to its maximum value. two types of capacitors, c1 and c2 (see above diagram) determine the cutoff frequency of the filter. the cutoff frequency is decreased by reducing the capacitance while maintaining the ratio c1/c2 nearly constant. higher cutoff frequency of the filter makes the sound brighter. recommended combinations of the capacitors, c1 and c2 are as follows. 1. 0.022 m f and 0.018 m f (standard) 2. 0.018 m f and 0.015 m f 3. 0.015 m f and 0.012 m f 4. 0.012 m f and 0.010 m f 5. 0.010 m f and 8200 pf 6. 8200 pf and 6800 pf 7. 6800 pf and 5600 pf (lower limit) 1 3 5 7 wide surround effects frequency capacitance combination number use any of the above combinations so that a favorite tone is obtained.
yss906 - 6 - 2. determination of capacitance and resistance for tone control function tone level change vs. frequency characteristics are as follows when the resistance and capacitance are used as parameters. ra c ra vr + - vr/ra ratio c tal tbl aol l-out [db] + - [db] + - bass control circuit variance variance frequency frequency when ra and vr are fixed and c is changed when c is fixed and vr/ra ratio is changed higher lower lower higher - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - higher tal tbl aol rb vr c +- l-out treble control circuit [db] + - when c is fixed and ra/rb ratio is changed when rb and vr are fixed and c is changed ra is the resistor shown in the "bass control circuit diagram" ra/rb ratio c [db] + - variance variance frequency frequency higher lower lower the range of level change is recommended to be +/-10 db as a standard, and to be +/-15 db or less. 3. designing boards and selecting components designing the boards that include yss906 requires no special care. selection of components to be used with the device can be made in the same way as normal audio circuits. use of ceramic capacitors is not recommended for pseudo-stereo, wide surround and tone control because of their thermal characteristics. polyester film (mylar) capacitors are recommended for this purpose.
yss906 - 7 - 4. enabling/disabling functions through sw(11) this lsi uses the built-in seven comparators to determine the voltage created by the combined resistance of 50 k w , 100 k w and 200 k w resistors, and enables or disables the functions based on the result of the comparison. the following table presents the voltages determined by the comparators and functions enabled or disabled by the voltages. resistors, and pins to be connected to voltage at pseudo wide tone 50k w 100k w 200k w sw pin -stereo surround control vdd vdd vdd vdd on on on vdd vdd vss 6/7 vdd on on off vdd vss vdd 5/7 vdd on off on vdd vss vss 4/7 vdd on off off vss vdd vdd 3/7 vdd off on on vss vdd vss 2/7 vdd off on off vss vss vdd 1/7 vdd off off on vss vss vss vss off off off on: enabled off:disabled be sure to connect the recommended 50 k w , 100 k w and 200 k w resistors to vdd or vss according to the combination of the functions to be used, and apply an appropriate voltage to sw(11) pin accordingly by referring to the above table. (the combination of the functions to be used cannot be selected normally if any of the resistors is left unconnected. connect every resistor as specified by the table even if one or more of the functions is not used.) the switch for selecting a voltage on sw pin must be operated so that the specified voltage can be attained within 30 m sec. 5. inputting monaural signals when obtaining the pseudo-stereophonic effect by inputting monaural signals, supply the same signal to ail and air pins, and connect 50 k w resistor to vdd so that the pseudo-stereo function is enabled. 6. current this lsi takes current of 15 ma when vdd = 5 v.since current generally changes in proportion to voltage, the current becomes 9 ma when this lsi is used with vdd = 3 v. * note: enabling pseudo-stereo, wide surround and/or tone control functions increases the gain of internal circuit so that the output signal are clipped easily. therefore, the level of the input signal should be determined properly to avoid the clipping of the signal.the rise of the gain of the internal circuit should increase the level of outputted noise so that apparent s/n ratio is reduced. this phenomena is not abnormal. (the s/n ratio becomes approximately 82 db when the pseudo-stereo is enabled, wide surround is set to 50 %, and tone control is +3 db for treble and +6 db for bass.)
yss906 - 8 - electrical characteristics 1. absolute maximum ratings item symbol min. max. unit power supply voltage av dd avss-0.5 avss+7.0 v input voltage vin avss-0.5 avdd+0.5 v output voltage vout avss-0.3 avdd+0.3 v storage temperature tstg -50 125 c 2. recommended operating conditions item symbol min. typ. max. unit power supply voltage av dd 3.0 5.0 5.5 v operating temperature top -40 25 85 c 3. analog characteristics (conditions : ta= 25 c, vdd= 5.0 v) item condition min. typ. max. unit current vdd=5v - 15 - ma analog max. input voltage vdd=5v - - 1.0 vrms s/n ratio ihf-a - 95 - db distortion factor input : 1 vrms pseudo-stereo, wide surround, tone control are disabled. - 0.0025 - % gain variation - - 0.5 db frequency response 10hz - 50 khz -3.0 - 0.5 db input impedance - 30 - k w input capacitance - - 15 pf center voltage - 2.5 - v
yss906 - 9 - external dimensions YSS906-N (skdip)
yss906 - 10 -
yss906 - 11 -
yss906 - 12 copying prohibited ? 1987 yamaha corporation printed in japan important notice 1. yamaha reserves the right to make changes to its products and to this document without notice. the information contained in this document has been carefully checked and is believed to be reliable. however, yamaha assumes no responsibilities fo r inaccuracies and makes no commitment to update or to keep current the information contained in this document. 2. these yamaha products are designed only for commercial and normal industrial applications, and are not suitable for other uses, such as medical life support equipment, nuclear facilities, critical care equipment or any other application the failure of which could lead to death, personal injury or environmental or property damage. use of the products in any such application is at the customer's sole risk and expense. 3. yamaha assumes no liability for incidental, consequential or special damages or injury that may result from misapplication or improper use or operation of the products. 4. yamaha makes no warranty or representation that the products are subject to intellectual property license from yamaha or anythird party, and yamaha makes no warranty or representation of non-infringement with respect to the products. yamaha specifically excludes any liability to the customer or any third party arising from or related to the products' infringement of any third party's intellectual property rights, including the patent, copyright, trademark or trade secret rights of any third party. 5. examples of use described herein are merely to indicate the characteristics and performance of yamaha products. yamaha assumes no responsibility for any intellectual property claims or other problems that may result from applications based on the examples described herein. yamaha makes no warranty with respect to the products, express or implied, including, but not limited to the warranties of merchantability, fitness for a particular use and title. note) the specifications of this product are subject to improvement change without prior notice. head office tokyo office osaka office 203, matsunokijima, toyooka-mura, tel. +81-539-62-4918 2-17-11, takanawa, minato-ku, tokyo, 108-8568 yamaha corporation semi-conductor sales & marketing department agency address inquiries to: u.s.a office iwata-gun, shizuoka-ken,438-0192 fax. +81-539-62-5054 tel. +81-3-5488-5431 fax. +81-3-5488-5088 shinsaibashi plaza bldg. 4f 3-12-9, minami senba, chuo-ku osaka city, osaka, 542-0081 tel. +81-6-252-7980 fax. +81-6-252-5615 yamaha systems technology. 100 century center court, san jose, ca 95112 tel. +1-408-467-2300 fax. +1-408-437-8791

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