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BH3868BFS audio ics 1/27 audio sound processor with ? r BH3868BFS BH3868BFS is a audio sound processor ic developed for tv. this ic is built-in volume, balance, tone, surround, bbe processor and agc. this ic can be easily controlled by tow-wire serial control (i 2 c bus). ? bbe is a registered trade mark of bbe sound inc. note : i 2 c bus is a registered trade mark of philips. applications suitable for tv, tv-radio, pc-tv, mini-component and car audio system, etc. features 1) volume (main volume), balance (right/left), tone (bass and treble), surround (mode and effect), bbe processor (effect) can be controlled by i 2 c-bus. 2) volume is vca with low distortion rate and low noise and can restrain the step noise. 3) the reference voltage source is stable, only a few external devices are required because i/o buffer is contained, and the package is suitable for space-saving design for ssop-a32. 4) sound spread can be controlled by the matrix surround and effect adjustment. 5) the built-in agc circuit can absorb the volume difference between input sources. 6) the contained bbe processor, which reproduce an original sound, controls the effect. absolute maximum ratings (ta=25 c) parameter symbol limits unit impressed voltage power dissipation operating temperature range storage temperature range v cc pd topr tstg 10.0 850 ? ? 40 to + 85 ? 55 to + 150 v mw c c ? when mounted on a glass epoxy board 70mm 70mm 1.6mm. reduced by 6.8mw for each increase in ta of 1 c over 25 c. recommended operating conditions (ta=25 c) parameter symbol typ. min. max. unit power supply voltage v cc ? 7.0 9.5 v
BH3868BFS audio ics 2/27 block diagram 16 17 15 18 14 19 13 20 12 21 11 22 10 23 9 24 8 25 7 26 6 27 5 28 4 29 3 30 2 31 1 32 logic control v cc vol tone r ? s vol bias agc l ? r l + r phase shift lpf amp bbe vref vol tone l + s vol bbe scl sda bc vc1 out1 tre1 bas1 btreb1 btrea1 bbasb1 bbasa1 in1 ps2 ps1 agcadj filter chip v cc tc vc2 out2 tre2 bas2 btreb2 btrea2 bbasb2 bbasa2 in2 sout ls2 ls1 gnd
BH3868BFS audio ics 3/27 pin descriptions pin no. pin name function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 gnd ls1 ls2 sout in2 bbasa2 bbasb2 btrea2 btreb2 bas2 tre2 out2 v c2 tc v cc chip scl sda bc v c1 out1 tre1 bas1 btreb1 btrea1 bbasb1 bbasa1 in1 ps1 ps2 agcadj filter ground terminal alc detector terminal at suppression side alc detector terminal at amplification side surround signal output terminal 2ch sound signal input terminal 2chbbe contour frequency setting terminal 2chbbe contour frequency setting terminal 2chbbe process frequency setting terminal 2chbbe process frequency setting terminal 2ch bass fc setting terminal 2ch treble fc setting terminal 2ch sound signal output terminal 2ch volume control terminal treble control terminal power supply terminal chip select terminal i 2 c clock input terminal i 2 c data input terminal bass control terminal 1ch volume control terminal 1ch sound signal output terminal 1ch treble fc setting terminal 1ch bass fc setting terminal 1chbbe process frequency setting terminal 1chbbe process frequency setting terminal 1chbbe contour frequency setting terminal 1chbbe contour frequency setting terminal 1ch sound signal input terminal 1st phase shift setting terminal 2nd phase shift setting terminal agc suppression level setting terminal filter terminal
BH3868BFS audio ics 4/27 input output circuits the terminal voltage shall be on when the data 0v volume=minimum, tone=flat, bbe=off, surround=off and agc=off after the power supply vcc=9.0(v) has been turned on, and any external devices shall comply with the measurement circuit diagram. pin. no equivalent circuit description terminal to set a time constant at a side for suppressing a signal level of agc. terminal to set a time constant at a side for amplifying a signal level of agc. terminal for output of surround and pseudo stereo and to set a frequency characteristic. terminal for sound signal input. 2 3 pin name ls1 ls2 5 28 in2 in1 terminal voltage 0v 0v 4 sout 4.5v 4.5v 2pin gnd v cc 430 3pin gnd v cc 20k 4pin 10k gnd v cc 5pin 28pin gnd 30k v cc
BH3868BFS audio ics 5/27 pin. no 6 27 7 26 bbasa2 bbasa1 bbasb2 bbasb1 9 24 btreb2 btreb1 4.5v 4.5v 8 25 btrea2 btrea1 4.5v 4.5v 7pin 26pin 200 200 gnd v cc 6pin 27pin gnd 21.5k v cc 8pin 25pin gnd 21.5k v cc 9pin 24pin 200 200 gnd v cc equivalent circuit description terminal to set a contour frequency of bbe. terminal to set a contour frequency of bbe. terminal to set a process frequency of bbe. terminal to set a process frequency of bbe. pin name terminal voltage
BH3868BFS audio ics 6/27 pin. no 10 23 11 22 bas2 bas1 tre2 tre1 13 20 v c2 v c1 4.5v 4.5v 12 21 out2 out1 4.5v 0v 12pin 21pin 200 200 gnd v cc 10pin 23pin gnd v cc 11pin 22pin gnd 30k v cc 13pin 20pin gnd v cc 30k ? d / a equivalent circuit description terminal to the cutoff frequency of bass tone control. terminal to the cutoff frequency of treble tone control. terminal for sound signal output. terminal equipped with an external circuit to prevent a shock sound upon volume switching. pin name terminal voltage
BH3868BFS audio ics 7/27 pin. no 14 19 16 tc bc chip 18 sda 1.94v ? 17 scl ? ? 17pin gnd v cc 18pin 50 gnd v cc 14pin 19pin gnd v cc 30k ? d / a 16pin gnd 250k v cc equivalent circuit description terminal equipped with an external circuit to prevent a shock sound upon tone switching. chip select terminal. clock input terminal for i 2 c bus controller. data input terminal for i 2 c bus controller. pin name terminal voltage
BH3868BFS audio ics 8/27 pin. no 29 30 ps1 ps2 32 filter 4.5v 4.5v 31 agcadj ? 4.5v 29pin gnd 18k 18k 10k v cc 30pin gnd 18k 18k v cc 31pin gnd 20k 20k v cc 32pin gnd 50k 50k v cc equivalent circuit description terminal to set the 1st phase shift. terminal to set the 2nd phase shift. terminal to set the cut levle of agc. filter terminal. pin name terminal voltage
BH3868BFS audio ics 9/27 electrical characteristics (unless otherwise noted, ta=25 c, v cc =9v, f=1khz, bw=20khz, vol=max, surround = off, tone=flat, agc=off, bbe=off, agcadj=3.45v, r r =600 ? , r l =10k ? ) parameter symbol min. typ. max. unit conditions current upon no signal maximum input maximum output voltage gain maximum attenuation cross-talk bass control range treble control range surround effect control range bbe contour control range bbe process control range agc i/o level 1 agc i/o level 2 agc i/o level 3 agc i/o level 4 total harmonic distortion output noise voltage residual output noise voltage channel balance input impedance output impedance ripple rejection input voltage "h" input voltage "l" i q v im v om g v att v ct vbmax. vbmin. vtmax. vtmin. g sr g ps g ph a gc1 a gc2 a gc3 a gc4 thd v no1 vm no g ca r in r out rr v ih v il ? 2.8 2.2 ? 1.5 90 70 12 ? 18 12 ? 18 7 9 9 0.7 50 150 200 ? ? ? ? 1.5 20 ? 40 3 ? 0.5 30 3.0 2.5 0 110 80 15 ? 15 15 ? 15 10 10 10 1.0 75 200 280 0.01 48 2.5 0 30 ? ? 5 0 45 ? ? 1.5 ? ? 18 ? 12 18 ? 12 13 11 11 1.4 100 250 360 0.1 75 10 1.5 40 10 ? 5.5 1.5 ma v rms v rms db db db db db db db db db db mv rms mv rms mv rms mv rms % v rms v rms db k ? ? v v v no signal thd = 1%, v ol =? 20db (att) thd = 1% v in = 1v rms v in = 1v rms v in = 1v rms 100hz, v in = 100mv rms 100hz, v in = 100mv rms 10khz, v in = 100mv rms 10khz, v in = 100mv rms v in = 1v rms 100hz, v in = 100mv rms 10khz, v in = 100mv rms v in = 1.0mv rms v in = 50mv rms v in = 200mv rms v in = 1.0v rms v o = 0.5v rms, bpf = 400hz~30khz no signal, v ol = max. rg = 0 no signal, v ol =? , rg = 0 measured based on ch1. f = 1khz f = 1khz f = 100hz, v rr = 100mv rms scl, sda scl, sda ? ? ? measured by vp-9690a of matsushita (detection of mean value and indication of root-mean-value). radiation resistance is not included in the design. the i/o phase of signal is the same.
BH3868BFS audio ics 10/27 control signal specification (1) electrical specifications and timing for bus lines and i/o stages sda scl p t buf t hd : sta t hd : dat t low t high t su : dat t hd : sta t sp t su : sta s r t su : sto p t r t f s fig.1 definition of timing on the i 2 c bus table b characteristics of the sda and scl bus lines for i 2 c bus devices rise time of both sda and scl signals parameter symbol unit max. min. f scl t hd ; sta t buf 0 khz scl clock fequency fall time of both sda and scl signals set-up time for stop condition ? a device must internally provide a hold time of at least 300ns for the sda signal (referred to the v ih min. of the scl signal) in order to bridge the undefined region of the falling edge of scl. bus free time between a stop and start condition hold time (repeated) start condition. after this period, the first clock pulse is generated low period of the scl clock high period of the scl clock set-up time for a repeated start condition data hold time data set-up time t low t high t su ; sta t hd ; dat t su ; dat t r t f t su ; sto ? ? 4.0 250 0 ? 4.7 4.7 4.7 4.0 4.0 100 1000 300 ? ? ? ? ? ? ? ? s s s s s s ns s capacitive load for each bus line cb ? 400 pf ns ns all values referred to v ih min. and v il max. levels (see table c).
BH3868BFS audio ics 11/27 table c characteristics of the sda and scl i/o stages for i 2 c bus devices parameter symbol unit max. min. v il v v v ns v ns a pf low level input voltage : fixed input levels v dd -related input levels fixed input levels v dd -related input levels fixed input levels v dd -related input levels pulse width of spikes which must be suppressed by the input filter. ? 1 maximum v ih = v ddmax. + 0.5v ? 2 cb = capacitance of one bus line in pf. note that the maximum t f for the sda and scl bus lines quoted in table b (300ns) is longer than the specified maximum t of for the output stages (250ns). this allows series protection resistors (r s ) to be connected between the sda/scl pins and the sda/scl bus lines as shown in fig.1 without exceeding the maximum specified t f . high level input voltage : hysteresis of schmitt trigger inputs : v ih v hys t sp t of i i c i v ol1 (v ol2 ) ( ? 0.5) ? 0.5 (0.3 v dd ) 1.5 ? 10 10 10 0 0.4 250 ? 2 (0.7 v dd ) 3.0 ( ? 1 ) ? 1 (n/a) n/a (n/a) (n/a) (n/a) (n/a) (n/a) n/a n/a n/a low level output voltage (open drain or open collector) : output fall time from v ih min. to v il max. with a bus capacitance from 10pf to 400pf : at 3ma sink current with up to 3ma sink current at v ol1 with up to 6ma sink current at v ol2 input current each i/o pin with an input voltage between 0.4v and 0.9 v ddmax. capacitance for each i/o pin. at 6ma sink current ? ? n/a = not applicable the above-mentioned characteristics are theoretical values based on ic design and the delivery inspection does not guarantee an ything. if any trouble is made, we will take necessary arrangements and actions in our faith.
BH3868BFS audio ics 12/27 (2) i 2 c bus format s slave address msb lsb msb lsb msb lsb 1bit 1bit 8bit 1bit 8bit 1bit 1bit 8bit select address data aaap ? s =start condition (recognition of start bit) ? slave address =recognition of ic. the high order 7 bits are optional. the least significant bit is ?l? for writing. ? a =acknowledge bit (recognition of acknowledgement) ? select address =selection of 1ch volume, 2ch volume, bbe effect, bass + bbe, treble + mute and agc + matrix surround. ? data =data on volume and tone. ? p =stop condition (recognition of stop bit) slave address of BH3868BFS fixing 16pin to v cc d7 1 d6 0 d5 0 d4 0 d3 0 d2 0 d1 1 r / w 0 msb lsb making 16pin open d7 1 d6 0 d5 0 d4 0 d3 0 d2 0 d1 0 r / w 0 msb lsb (3) setting of select address parameter d7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 d6 d5 d4 d3 d2 d1 d0 msb lsb 1ch volume 2ch volume bbe processor bbe, bass mute, treble agc, surround 0 1 2 3 4 5 upon transferring consecutive data, the select address circulates because of the automatic increment function as follows: 0 1 2 3 4 5 the circulation starts from the select address specified first. it doesn't patrol from selection address 5 to selection address 0.
BH3868BFS audio ics 13/27 (4) data configuration parameter d7 bbe mute agc process sste smon loop son 1ch volume 2ch volume bass treble contour surround effect d6 d5 d4 d3 d2 d1 d0 msb lsb 1ch volume 2ch volume bbe processor bbe, bass mute, treble agc, surround 0 1 2 3 4 5 volume : all h : att 0db all l : att - db bbe processor : all h : max. all l : min. bass / treble : all h : max. all l : min. surround effect : all h : max. all l : min. bbe : h : on l : off agc : h : on l : off(agc : auto gain control) mute : h : on l : off loop : h : on l : off(loop : surround effect enhanceer) sste : h : on l : off(sste : surround stereo) smon : h : on l : off(smon : surround monoral) son : h : on l : off(son : surround on) note : it is advisable to apply mute upon switching the mode and gain of bbe and surround.
BH3868BFS audio ics 14/27 volume gain setting list hex. notation gain ( db) d7 d6 d5 d4 d3 d2 d1 d0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 1 1 0 0 0 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 1 1 0 1 1 0 1 1 0 0 1 1 0 0 0 1 1 0 1 1 0 1 1 0 1 1 0 0 1 1 0 0 0 1 1 0 0 1 0 1 1 1 0 0 0 0 0 1 0 1 0 1 0 1 0 0 1 0 0 1 0 0 1 0 1 1 0 1 0 1 0 1 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 1 1 1 1 1 1 1 1 1 0 0 0 1 0 0 1 0 0 0 1 1 1 1 1 1 1 1 0 0 1 1 0 1 0 1 0 1 0 0 1 0 1 0 0 0 0 0 0 0 1 0 0 1 1 1 0 0 1 0 0 1 1 1 0 1 1 1 0 0 1 0 1 0 ffh eah dfh d6h cfh c8h c2h b9h b8h b3h aeh aah a6h a2h 9eh 9ah 96h 93h 90h 8ch 89h 83h 7dh 78h 72h 6dh 68h 64h 5fh 5bh 57h 52h 4fh 4bh 47h 42h 40h 3dh 3ah 37h 34h 0 ? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ? 7 ? 8 ? 9 ? 10 ? 11 ? 12 ? 13 ? 14 ? 15 ? 16 ? 17 ? 18 ? 19 ? 20 ? 22 ? 24 ? 26 ? 28 ? 30 ? 32 ? 34 ? 36 ? 38 ? 40 ? 42 ? 44 ? 46 ? 48 ? 50 ? 52 ? 54 ? 56 ? 58 ? 60
BH3868BFS audio ics 15/27 hex. notation gain ( db) d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 0 1 1 0 0 0 0 0 0 0 1 1 0 32h 2fh 2dh 2ah 28h 26h 24h 22h 20h 1eh 1dh 1bh 00h ? 62 ? 64 ? 66 ? 68 ? 70 ? 72 ? 74 ? 76 ? 78 ? 80 ? 82 ? 84 ? treble / bass setting list treble gain hex. notation gain ( db) d6 d5 d4 d3 d2 d1 d0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 0 0 0 1 1 0 0 1 1 1 1 0 0 1 0 0 0 0 1 1 0 1 1 1 0 1 1 0 0 1 0 0 1 1 0 0 1 0 0 1 1 1 1 1 0 1 0 1 0 1 1 0 1 0 1 1 0 1 1 0 0 1 1 1 1 0 0 0 1 1 1 1 0 0 0 7fh 3fh 36h 32h 2fh 2dh 2bh 29h 26h 20h 1ah 17h 15h 13h 11h 0eh 0ah 00h + 15 + 15 + 14 + 12 + 10 + 8 + 6 + 4 + 2 0 ? 2 ? 4 ? 6 ? 8 ? 10 ? 12 ? 14 ? 15
BH3868BFS audio ics 16/27 bass gain hex. notation gain ( db) d6 d5 d4 d3 d2 d1 d0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 0 0 0 1 1 0 0 1 1 1 1 0 0 1 0 0 0 0 1 1 0 1 1 1 0 1 1 0 0 1 0 0 1 1 0 0 1 0 0 1 1 1 1 1 0 1 0 1 0 1 1 0 1 0 1 1 0 1 1 0 0 1 1 1 1 0 0 0 1 1 1 1 0 0 0 7fh 3fh 36h 32h 2fh 2dh 2bh 29h 26h 20h 1ah 17h 15h 13h 11h 0eh 0ah 00h + 15 + 15 + 14 + 12 + 10 + 8 + 6 + 4 + 2 0 ? 2 ? 4 ? 6 ? 8 ? 10 ? 12 ? 14 ? 15 bbe gain process hex. notation gain ( db) d7 d6 d5 d4 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 fh eh dh ch bh ah 9h 8h 7h 6h 5h 4h 3h 2h 1h 0h 10.0 9.0 8.0 7.0 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
BH3868BFS audio ics 17/27 contour hex notation gain ( db) d3 d2 d1 d0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 fh eh dh ch bh ah 9h 8h 7h 6h 5h 4h 3h 2h 1h 0h 10.0 9.0 8.0 7.0 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 surround gain setting list hex. notation reference value : the setting table is a reference value persistently and the sctual use condition sometimes changes the gain of volume, the tone, surround. in case of data setting, we request confirmation. gain ( db) d2 d1 d0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 7h 6h 5h 4h 3h 2h 1h 0h 10 9 8 7 6 5 4 3 (5) notes on data transfer this ic is equipped with the automatic increment function to improve the rate of data transfer. in addition to the data format shown in the under-mentioned basic format, the other data format automatic increment is also available for the data transfer. 1) basic format s slave address msb lsb msb lsb msb lsb select address data aaap
BH3868BFS audio ics 18/27 2) automatic increment (the select address is incremented (by one) according to the number of data.) s slave address msb lsb msb lsb msb lsb select address data1, data2, , datan aa ap example : <1> data 1 shall be set as the data of the address specified by the select address. <2> data 2 shall be set as the data of the address specified by the select address + 1. <3> data n shall be set as the data of the address specified by the select address + n ? 1. 3) configuration unavailable for transfer (in this case, the select address 1 only is set.) s slave address msb lsb msb lsb lsb msb lsb lsb select address select address 2 data data aa msb a msb aap note : if any data is sent as the select address 2 immediately after the data, such data is recognized as the data, not the select address 2. agc (1) level setting the agc suppression level can be set by the voltage of the agdadj terminal (31pin). assuming that the suppression level is gc (mvrms) and the agcadj voltage is adj (v), setting can be expressed as follows: gc= ? 286 adj + 1186 the under-mentioned table shows a guideline of setting. suppression level (mvrms ) agcadj terminal voltage (v) 3.8 3.45 3.1 2.75 100 200 300 400 the level specified by the electrical characteristic is agcadj=3.45 (v) and the suppression level is approximately 200 (mvrms). use the suppression level in a rage from 100 (mvrms) to 400 (mvrms). the under-mentioned chart shows the characteristic when the suppression level is set to 100 (mvrms), 200 (mvrms), 300 (mvrms) and 400 (mvrms). 10 10 1 0.1 0.01 0.001 1 0.1 0.01 0.001 output (v rms ) input (v rms ) fig.2 agc characteristics volume = max. tone = flat bbe = off surround = off agc = on f = 1khz
BH3868BFS audio ics 19/27 (2) setting of attack time and release time in this ic, the attack time and release time can be set in the boost side and cut side of agc separately. + 2 430 c 1 1 ls1 r r1 r l1 1meg detector circuit of suppression attack time recovery time : r r1 c 1 : r l1 c 1 + 3 20k c 2 1 ls2 r r2 r l2 1meg detector circuit of amplification attack time recovery time : r r2 c 2 : r l2 c 2 the attack time and recovery time shall be set by a resistor in ic and external capacitor and resistor. the internal resistance is r r1 =430 ? and r r2 =20k ? (typ). if the constant of capacitor c 2 of ls2 decreases, an amplification starting point is shifted in a direction of smaller input voltage. moreover, the distortion rate also changes and becomes worse. if the constant of capacitor c 1 of ls1c 1 decreases, the distortion rate becomes worse. if the resistance value of r l1 increases, the suppression is reduced. surround (1) setting of frequency characteristic this ic has an output terminal (4pin) for the surround signal. the surround characteristic can be varied by adding an appropriate filter to this terminal. an example of characteristic that low-pass filter has been set is shown below : + ? + ? 4 10k r 1 r 2 c 0.0047 4.7k sout an amplifier to define the sound effect. a 2 a 1 f 2 f 1 frequency [hz] gain [db] f 1 = 2 cr 2 1 f 2 = 2 c(r 1 + r 2 ) 1 a 1 = r 1 + r 2 r 2 a 2 = 1
BH3868BFS audio ics 20/27 (2) setting of phase shifter this ic contains two stages of phase shifters. if none of two stages of phase shifters are not used, the pseudo-stereo function is also unavailable. if only one of these phase shifters is used, the normal of pseudo stereo may be spoiled. + ? c 1 r 1 18k r 2 18k 0.1 29 r 3 18k + ? c 1 r 1 18k r 2 18k 0.1 30 r 3 18k resistance in ic is 18k ? (typ.). = ? 2tan ? 1 ( 2 fr 1 c 1 ) (3) surround and pseudo-stereo operation ? t 1 ? t 2 : time delayed by a phase shifter p 1 p 2 : attenuation made by a phase shifter e : surround effect 1) surround + + + + ? + 21 12 28 5 lch rch l ? r phase shifter phase shifter effect control ? t 1 p 1 ? t 2 p 2 e lpf l out = l + ? t 1 ? t 2 p 1 p 2 (l ? r) e r out = r ? ? t 1 ? t 2 p 1 p 2 (l ? r) e 2) pseudo stereo + + + + ? + 21 12 28 5 lch rch 2 (l + r) b, p, f configured externally phase shifter phase shifter e lpf effect control ? t 1 p 1 ? t 2 p 2 l out = l + ? t 1 ? t 2 p 1 p 2 (l + r) e r out = r ? ? t 1 ? t 2 p 1 p 2 (l + r) e the above-mentioned figures show the block diagram of surround and pseudo stereo ics. the characteristics of surround and pseudo stereo can be varied by changing the effect. moreover, the number of states of phase shifters can be increased by turning on a switch of loop. however, an operation becomes unstable if the gain of effect is increased while the switch of loop remains turning on. therefore, the effect should be approximately 6 db. upon switching the surround and pseudo stereo to each other, be sure to turn on a switch at the stereo surround side of sste to prevent a shock sound.
BH3868BFS audio ics 21/27 bbe this ic is equipped with bbe to achieve the clear sound. the characteristic can be changed by an external constant. if any constant other than recommendable ones is used, please ask bbe for confirmation. frequency setting gain f c1 f c2 f c3 freq. 3db f c1 = 224hz 2 21.5k c1 1 2 21.5k 0.033 1 = f c2 = 2.24khz 2 21.5k c2 1 2 21.5k 0.0033 1 = f c3 = 60.3khz 2 21.5k c3 1 2 56.2k 47p 1 = f c3 is fixed at the inside. c1 = capacity between 6pin ? 7pin, and 27pin ? 26pin. c2 = capacity between 8pin ? 9pin, and 25pin ? 24pin. tone control setting of bass frequency + ? c 30k 23pin 10pin equivalent circuit f c = 2 30k c (hz) 1 gain gain f c freq. 3db
BH3868BFS audio ics 22/27 setting of treble frequncy + ? c 30k 30k 60p 22pin 11pin equivalent circuit + ? f c2 = 88k (hz) 2 30k 60p 1 f c1 = 2 30k c (hz) 1 gain gain f c1 freq. 3db 88k
BH3868BFS audio ics 23/27 application 16 17 15 18 14 19 13 20 12 21 11 22 10 23 9 24 8 25 7 26 6 27 5 28 4 29 3 30 2 31 1 32 logic control v cc vol tone r ? s vol bias agc l ? r l + r phase shift lpf amp bbe vref vol tone l + s vol bbe 4.7 4.7 1000p 0.033 0.0033 0.1 0.1 62k 39k v cc 100 10 10 0.033 4.7 4.7 1000p 0.033 0.0033 0.0047 4.7k 1 1 1meg 10 10 0.033 1meg fig.3
BH3868BFS audio ics 24/27 electrical characteristics curve 0 0 246810 quiescent current : i q (ma) power supply voltage : v cc (v) fig.4 quiescent current 4 8 12 16 20 24 28 32 36 40 44 48 9 7 5 3 1 condition : in view of electrical characteristics 1m 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 2m 5m 10m 20m 50m 100m 200m 500m 1 2 3 total harmonic distortion : thd (%) input voltage : v in (v rms ) fig.5 thd fig.6 tone frequency treble boost bass boost bass cut treble cut flat 10 + 20 output gain : g (db) input frequency : f (hz) ? 16 ? 20 ? 12 ? 8 ? 4 ? 0 + 4 + 8 + 12 + 16 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 10 ? 10 + 15 output gain : g (db) input frequency : f (hz) fig.7 bbe frequency ? 7.5 ? 5 ? 2.5 + 0 + 2.5 + 5 + 7.5 + 10 + 12.5 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 10 0 noise voltage : v no ( v rms ) attenuation : v att (db) fig.8 noise level 0 ? 10 ? 20 ? 30 ? 40 ? 50 ? 60 ? 70 ? 80 ? 90 20 30 40 50 60 operation notes 1. we trust that an example of application circuits are recommendable and we would like to ask you to check the under- mentioned notes and the characteristics carefully. if you will modify and external circuit constant upon use, you should allow for not only static characteristics but also transient characteristics, unexpected variation of external components and our ics. 2. operating power supply voltage range basic circuit function and operation can be guaranteed within the operating temperature range and within the operating power supply voltage range. upon use, check those ranges carefully and specify the content, element, voltage and temperature.
BH3868BFS audio ics 25/27 3. step switching noise in an example of application circuit, an example of constant is set on vc1, vc2, tc and bc terminals. this constant varies depending on signal level setting, actual wiring pattern, etc. specify each constant under careful study and examination. the internal equivalent circuit is shown below. (a primary integration circuit is set for gradual variation.) + ? r c every terminal (external) v c1, v c2, tc , bc 30 r value (k ? ) 4. level setting of volume and tone attenuation to control serial data is stated as a reference value in our specifications. an internal d/a converter is configured by the r-2r method and, therefore, there is any data also in an area in which some data are not consecutive. use is for fine adjustment. however, the volume must be within 8 bits (256 steps) and the tone must be 7 bits (64 + 1 steps). 5. i 2 c bus control high-frequency digital signal is inputted into the scl terminal and sda terminal. therefore, however, wire not to interfere any analog signal system line. 6. power-on reset this ic contains a circuit for initialization when the power supply turns on. every channel volume has been set to become ? when the power supply turns on. when the power supply is turned on once and off and then on again immediately, the said description may not be achieved if any load remains in a capacitor. in this case, apply muting until a command of i 2 c bus has been sent. 7. capacitor of vref (8pin) 100 f is recommended as the capacity of power supply filter attached to vref. if this capacity is decreased, the maximum attenuation of volume is deteriorated and the cross-talk also tends to become worse. this ic contains a precharge circuit and discharge circuit for capacitor attached to vref. bbe process the bbe sound processor considers a loudspeaker and amplifier as total audio system, reproduces accurately ?rise of sound? which characterizes the sound, by an appropriate signal processing at a stage before amplifier input, and makes the playback sound an original one as naturally as possible.
BH3868BFS audio ics 26/27 problem in sound reproduction with audio system and bbe process in general, for the natural sound, treble harmonic element is generated first and then bass basic wave element is produced. this is the same with the attack part which shows the characteristics of various musical instruments. the amplitude element, which forms a frequency element and envelope at the rise of sound, expresses the character of the sound. therefore, to reproduce any sound with a playback system, it is very important to express accurately the rise of sound against the original sound. however, there is unavoidable mismatch between a loudspeaker and amplifier of today?s audio playback system. for example, a power amplifier with transistor operates as constant-voltage source, but mismatch cannot be avoided because one loudspeaker is a current element. moreover, the impedance characteristic of loudspeaker is affected considerably by electric reactance of voice coil or mechanical reactance of cone assembly. as a result, the rise of sound is distorted and the phase of playback sound is deviated. furthermore, due to the increase of treble impedance, the loudspeaker amplitude is reduced and the harmonic element is deteriorated. so the treble element is easy to be masked by a consequent middle tone element of high level, and the rise of sound is hard to be produced accurately. bbe has been developed to solve those problems. bbe is a technology to reproduce the sound clearness more naturally by moving the delayed harmonic before the basic wave first to construct the same wave as that of the natural sound and then boosting slightly the treble which is easy to be attenuated. because of the synergistic effect of phase correction and treble boost, the same clearness can be obtained by approximately half boost in comparison with a simple boost of equalizer. it has been ten years or more since bbe was introduced into many recording studios, pa, sr sites and broadcasting stations, and 100,000 or more units of bbe for professional have been using. bbe is designated by many musicians to improve the sound of vocal and musical instruments. principle of operation to solve the problems in audio playback system mentioned in the previous page, the bbe processor processes a signal as follows: phase correction bass middle treble 20 150 2.4k 20k f (hz) by dividing the input signal to three frequency bands, ?bass? (20 to 150 hz), ?middle? (150hz to 2.4khz) and ?treble? (2.4k to 20khz), and by adding them again, the phase difference ? 360 in treble and ? 180 in middle against base are generated. these phase differences adjusts the time delay characteristic in every frequency band and minimizes the distortion of the rise of sound. revision of harmonic element gain is applied to treble, because the harmonic element (treble element), of which gain is expected to be deteriorated depending on the loudspeaker characteristic, must be enhanced. however, if treble is clear, it may seem that bass is insufficient. this can be corrected by applying the gain to bass. there are many audio system characteristics. the most suitable correction effect for your system can be obtained by bbe.
BH3868BFS audio ics 27/27 license agreement about patent and trademark bbe is a registered trademark of bbe sound inc. only authorized party, who is permitted to use the trademark and patent of bbe, can supply and sell BH3868BFS. for such trademark and patent of bbe, please contact : bbe sound lnc. 5381 production drive huntington beach, ca 92649 tel:(714)897-6766 fax:(714)896-0736 external dimensions (units : mm) ssop ? a32 0.15 0.15 0.1 0.3min. 7.8 0.3 5.4 0.2 1.8 0.1 0.11 1 32 0.36 0.1 16 17 13.6 0.2 0.8
appendix appendix1-rev1.0 the products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document use silicon as a basic material. products listed in this document are no antiradiation design. about export control order in japan products described herein are the objects of controlled goods in annex 1 (item 16) of export trade control order in japan. in case of export from japan, please confirm if it applies to "objective" criteria or an "informed" (by miti clause) on the basis of "catch all controls for non-proliferation of weapons of mass destruction.

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