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BH3874AKS2 audio ics sound processor ic BH3874AKS2 the BH3874AKS2 is a sound control ic for mini-component stereo. 4-ch input selector, vocal fade, volume, surround, 5- band graphic equalizer, dynamic bass, and 5-band spectrum analyzer are integrated into a single chip. soft switch can reduce the switching noise occurred when volume, vocal fade, surround, and dynamic bass are switched. ! ! ! ! applications mini component stereo, micro component stereo, cd radio cassette players, and tv. ! ! ! ! features 1) a single chip ic integrates all functions of volume, tone control, and spectrum analyzer. 2) soft switching can reduce the noise occured when volume, mode selector, surround, dynamic bass, and gain of graphic equalizer are switched. 3) 4-ch input selector, mode selector, volume, surround, graphic equalizer, dynamic bass, and spectrum analyzer. 4) built-in matrix surround, pseudo stereo circuit, and band pass filter for spectrum analyzer. 5) low distortion and low noise due to the bicmos process adopting resistance ladder volume. 6) filters of dynamic bass and biamp can be set freely by the combination of lpf and hpf. ! ! ! ! absolute maximum ratings (ta=25 c) parameter symbol limits unit power supply voltage v cc 10.0 v power dissipation pd 1200 ? mw operating temperature range topr ? 12 to +85 c storage temperature range tstg ? 55 to +125 c ? reduced by 12mw for each increase in ta of 1 c over 25 c. a standard board, 70 70 1.6mm, shall be mounted. ! ! ! ! recommended operating conditions (ta=25 c) parameter power supply voltage v cc 8.0 9.5 ? v symbol min. typ. max. unit
BH3874AKS2 audio ics ! ! ! ! block diagram 32 27 29 30 54 28 + ? + ? 31 35 34 33 + ? v cc v cc 2 1 + + + 26 25 24 23 58 57 60 59 15 12 11 8 7 4 3 64 63 16 14 13 10 9 6 5 2 1 39 38 37 36 40 52 48 46 44 42 41 43 45 47 55 53 62 filter 19 18 17 22 49 50 21 20 vca hpf hpf alc digtal control + + effect p s 61 51 56 p s + + + + ? + ? + + ? mode selector det det det det det 105hz 340hz 1khz 3.4khz 10.5khz + ? mpx ? 30db~ ? ? 9db ? 9db 0~30db 10k 19db 11db 22k 11db 10k 5 band eq l ? r l + r 5 band eq + + + + + ? + + ? + + + bpnf a b c bpout f1r1 f1r2 f2r1 f2r2 f3r1 f3r2 f4r1 f4r2 f5r f1l1 dpll2 dpll1 dplr2 dplr1 ps2 ps1 recl mic vfc2 vfc1 inld inlc inlb inla inra inrb inrc inrd recr f1l2 f2l1 f2l2 f3l1 f3l2 f4l1 f4l2 f5l hpfr1 hpfr2 hpfr3 alcr alcc bass4 bass3 bass2 bass1 hpfl3 hpfl2 hpfl1 stepc si sck outr cap bass5 outl gnd filter v cc
BH3874AKS2 audio ics ! ! ! ! pin descriptions function pin no. 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 rch greq f1 filter setting pin rch greq f1 filter setting pin lch greq f2 filter setting pin lch greq f2 filter setting pin rch greq f2 filter setting pin rch greq f2 filter setting pin lch greq f3 filter setting pin lch greq f3 filter setting pin rch greq f3 filter setting pin rch greq f3 filter setting pin lch greq f4 filter setting pin lch greq f4 filter setting pin rch greq f4 filter setting pin rch greq f4 filter setting pin lch greq f5 filter setting pin rch greq f5 filter setting pin lch high-pass filter setting pin rch high-pass filter setting pin lch high-pass filter setting pin lch high-pass filter setting pin rch high-pass filter setting pin rch high-pass filter setting pin dynamic bass filter setting pin dynamic bass filter setting pin dynamic bass filter setting pin dynamic bass filter setting pin biamp output pin v cc /2 pin rch sound signal output pin lch sound signal output pin alc trap frequency setting pin power supply pin pin name f1r1 f1r2 f2l1 f2r1 f2l2 f2r2 f3l2 f3r1 f3r2 f4l1 f4l2 f4r1 f4r2 f5l f5r hpfl1 hpfl2 hpfl3 hpfr1 hpfr2 hpfr3 bass1 bass2 bass3 bass4 bass5 filter cap v cc outr outl f3l1 function pin no. 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 time constant attachment for switching shock protection serial data latch receiving pin serial clock receiving pin parallel data receiving pin parallel data receiving pin output pin for spectrum analyzer lch sound signal input pin a rch sound signal input pin a lch sound signal input pin b rch sound signal input pin b lch sound signal input pin c rch sound signal input pin c lch recout output pin rch recout output pin rch sound signal input pin d time constant of alc setting pin alc level setting pin spectrum analyzer level setting pin parallel data receiving pin lch sound signal input pin d vocal fade filter setting pin ground pin vocal fade filter setting pin input pin for microphone lch output pin for dpl lch input pin for dpl lch greq f1 filter setting pin lch greq f1 filter setting pin rch input pin for dpl surround setting pin surround setting pin rch output pin for dpl pin name stepc si sck b a c bpnf inla inra inlb inrb inlc inrc inld inrd alcc alcr recl recr vfc1 gnd vfc2 mic dpll1 dpll2 dplr1 dplr2 ps1 ps2 f1l1 f1l2 bpout
BH3874AKS2 audio ics ! ! ! ! input / output circuits pin description equivalent circuit 41 42 43 44 45 46 inla inra inlb inrb inlc inrc a pin for inputting a sound signal. it is suitable for input of cd, md, tuner and tape. the input impedance is 50k ? (upon typical setting). a ground pin a pin for setting vocal fade frequency characteristic. a pin for inputting a sound signal. the input impedance is 20k ? (upon typical setting). it is possible to set 0db or ? 9db. a pin for outputting a sound signal for recording. 54 gnd 55 vfc2 47 48 inld inrd pin no. pin name pin voltage v cc /2 ?? v cc /2 v cc /2 51 52 recl recr v cc /2 v cc gnd 50k a pin for setting vocal fade frequency characteristic. 53 vfc1 v cc /2 v cc gnd 35k 35k 17.5k v cc gnd 35k 35k 17.5k v cc gnd v cc gnd 12.9k 7.1k
BH3874AKS2 audio ics pin description equivalent circuit 63 1 7 9 f1l1 f1r1 f3l1 f3r1 a pin for setting graphic equalizer frequency characteristic. a pin for setting graphic equalizer frequency characteristic. a pin for setting graphic equalizer frequency characteristic. a pin for inputting a microphone signal. the input impedance is 10k ? (upon typical setting). a pin for setting graphic equalizer frequency characteristic. a pin for setting graphic equalizer frequency characteristic. 64 2 8 10 f1l2 f1r2 f3l2 f3r2 15 16 f5l f5r 56 mic pin no. pin name pin voltage v cc /2 v cc /2 v cc /2 v cc /2 3 5 11 13 f2l1 f2r1 f4l1 f4r1 v cc /2 4 6 12 14 f2l2 f2r2 f4l2 f4r2 v cc /2 v cc gnd 10k 16k 4k 4k v cc gnd 10k 12k 3k 4k v cc gnd 16k v cc gnd 12k v cc gnd 17k 17k v cc gnd 10k
BH3874AKS2 audio ics pin description equivalent circuit 57 59 dpll1 dplr1 a pin for outputting dpl. power supply pin. a pin for setting surround phase shifter. a pin for setting cut-off frequency of hpf. a pin for setting cut-off frequency of hpf. 30 v cc 61 62 ps1 ps2 17 20 hpfl1 hpfr1 pin no. pin name pin voltage v cc /2 ?? v cc /2 v cc /2 18 21 hpfl2 hpfr2 v cc /2 a pin for inputting dpl. 58 60 dpll2 dplr2 v cc /2 v cc gnd 20k v cc gnd v cc gnd 7k v cc gnd v cc gnd 15.4k 15.4k 15.4k
BH3874AKS2 audio ics pin description equivalent circuit 19 22 hpfl3 hpfr3 a pin for setting cut-off frequency of hpf. a pin for setting dynamic bass (biamp) frequency characteristic. a pin for setting dynamic bass (biamp) frequency characteristic. a pin for outputting biamp. 23 25 bass1 bass3 24 26 bass2 bass4 pin no. pin name pin voltage v cc /2 v cc /2 v cc /2 27 bass5 v cc /2 a pin for setting threshold to set the alc. 50 alcr ? v cc gnd v cc gnd v cc gnd v cc gnd v cc gnd 20k 20k 42k 48k
BH3874AKS2 audio ics pin description equivalent circuit 28 filter a pin for inputting v cc /2 from outside of ic. a pin for specifying trap frequency of alc. a pin for setting attack time and release time of alc. a pin for inputting a signal clock. 29 cap 49 alcc pin no. pin name pin voltage v cc /2 v cc /2 0 35 sck ? a pin for outputting a sound signal. 32 31 outl outr v cc /2 a ground pin. 54 gnd ?? v cc gnd v cc gnd v cc gnd 15k 30k v cc gnd 1k v cc gnd vref
BH3874AKS2 audio ics pin description equivalent circuit 34 si a pin for inputting a serial data. a pin for inputting a parallel data. a pin for outputting a spectrum analyzer b.p.f.. a pin for adjusting gain of non-inverting amplifier in spectrum analyzer. 36 37 38 a b c 39 bpout pin no. pin name pin voltage ? ? ? 40 bpnf v cc /2 time constant attachment for switching shock protection. 33 stepc ? v cc gnd vref v cc gnd vref v cc gnd v cc gnd 22k v cc gnd 30k
BH3874AKS2 audio ics ! ! ! ! electrical characteristics (unless otherwise noted, ta=25 c, v cc =9v, f=1khz, rg=600 ? , r l =10k ? , v in =300mvrms, input selector=ach, mode selector=through, volume=0db, surround=0db, graphic equalizer=0db, dynamic bass=0db, spectrum analyzer=reset) circuit current no signal, after power on. maximum output voltage thd = 1% lch reference rg = 0 ? , volume =? , biamp = 0db, din audio biamp = 0db, rg = 0 ? , din audio total harmonic distortion rate v in = 150mvrms, 400hz ? 30khz bpf din audio din audio din audio output noise voltage biamp = 0db, din audio voltage gain maximum input voltage thd = 1% residual output noise voltage vocal fade suppression quantity graphic equalizer boost gain set error (set 2db,4db,6db) v in = 100mvrms f in = 100hz, 300hz, 1khz, 3khz, or 10khz v in = 100mvrms f in = 100hz, 300hz, 1khz, 3khz, or 10khz v in = 100mvrms f in = 100hz, 300hz, 1khz, 3khz, or 10khz v in = 100mvrms f in = 100hz, 300hz, 1khz, 3khz, or 10khz graphic equalizer cut gain set error (set ? 8db, ? 10db, ? 12db) graphic equalizer cut gain set error (set ? 2db, ? 4db, ? 6db) graphic equalizer boost gain set error (set 8db,10db,12db) dynamic bass boost channel balance dynamic bass boost gain graphic equalizer channel balance lch reference v in = 40mvrms, f in = 75hz 49pin = gnd lch reference input mute attenuation input separation parameter conditions 11121 1 05 03 04 0c 02 0a 06 81 07 05 03 04 0c 02 0a 06 81 07 05 03 04 0c 02 0a 06 81 07 05 03 04 0c 02 0a 06 81 07 1121 11121 11121 11121 11121 11121 1 1 2 2 3 3 1221 4 4 12 21 15 03 04 0c 02 0a 06 89 07 1 2 ? 21 15 03 04 0c 02 0a 06 89 07 1 2 ? 21 15 03 04 0c 02 0a 06 81 07 05 03 04 0c 02 0a 06 81 07 25 03 04 0c 02 0a 06 81 07 11121 05 03 04 0c 02 0a 06 01 07 11122 e5 03 04 0c 02 0a 06 81 07 11121 05 03 74 04 04 04 04 0c 7c 0c 0c 0c 02 02 72 02 02 0a 0a 0a 7a 0a 06 06 06 06 76 81 07 11121 05 03 e4 04 04 04 04 0c ec 0c 0c 0c 02 02 e2 02 02 0a 0a 0a ea 0a 06 06 06 06 e6 81 07 1/1 1/2 1/ ? 21 ????????? ????????? ????????? ????????? ?? ? ? ? ????????? ?? ? ? ? 11121 05 03 04 0c 02 0a 06 41 c1 61 07 ????????? ? ? ? ? ? data setting switch control table sw 1/4 sw 2/5 sw 3/6 sw 7 sw 8 [2] [3] [4] [4] [5] [5] [6] [7] [8] maximum attenuation cross talk microphone mute attenuation v in = 100mvrms din audio v in = 100mvrms f in = 10khz recout mute attenuation din audio selector d attenuation recout voltage gain microphone voltage gain v in = 100mvrms surround maximum voltage gain 1 05 03 04 0c 02 0a 06 81 07 15 03 04 0c 02 0a 06 81 07 05 03 04 0c 02 0a 06 81 07 0d 03 04 0c 02 0a 06 81 07 2 ? 11 12 ? 11 11121 11121 05 03 04 0c 02 0a 06 e1 07 4 1 1 21 00 00 00 00 00 00 00 f8 00 00 00 00 00 ? ? ? ? ? 00 ? [1] 00 00 00 00 00 00 05 1b 04 0c 02 0a 06 81 07 1 1 1 21 30 ? ? 41 42 43 44 45 46 32 31 32 31 32 31 32 31 32 31 32 31 32 31 32 31 32 31 32 31 32 31 32 31 31 32 51 52 47 48 ? measure- ment pin 32 31 32 31 51 52 51 52 32 31 32 31 input pin ? ? ? 41 42 43 44 45 46 41 42 41 42 41 42 41 42 41 42 41 42 41 42 41 42 41 42 41 42 41 42 41 42 41,42 41,42 41,42 41,42 47 48 ? 56 56 41 42 41 42 49 50 41 42 channel balance selector a-c input impedance symbol iq vom thd vno gv vim vmno gvf vgqbl vgqcl vgqcl vgqbh vbcb vbb gqcb vinmu ctin attmax ct vmicmu vrecmu d2att grec gmic vsumax cb rin rind ? 2.0 ? ? 9 0.4 ? 25 ? 2 ? 3 ? 2 ? 3 ? 1.5 15 ? 1.5 80 80 min. 86 70 80 80 ? 7 9 17 7 ? 1.5 35 10 40 2.5 0.01 35 11 0.7 5 30 0 0 0 0 0 18 0 90 90 typ. 95 80 90 90 ? 9 11 19 9 0 50 20 60 ? 0.05 50 13 ? 20 ? 2 3 2 3 1.5 21 1.5 ? ? max. ? ? ? ? ? 11 13 21 11 1.5 65 30 ma vrms % vrms db vrms vrms db db db db db db db db db db unit db db db db db db db db db k ? k ? selector d input impedance ? vp-9690a (average value detection, effective value display) din audio filter by matsushita communication is used for ? measurement. design against radiation-proof is not made. ? ? ? ? ? ? ? ?
BH3874AKS2 audio ics simulated stereo maximum voltage gain lch v in = 100mvrms f in = 680hz v in = 100mvrms f in = 680hz v in =? 19dbv v in = 0vrms spectrum analyzer output offset voltage spectrum analyzer maximum output level simulated stereo maximum voltage gain rch ripple rejection spectrum analyzer standard output level v in =? 37dbv f in = 105hz, 340hz, 1khz, 3.4khz, or 10.5khz vrr = 100mvrms f rr = 100hz, din audio parameter conditions data setting switch control table sw 1/4 sw 2/5 sw 3/6 sw 7 sw 8 [2] [3] [4] [4] [5] [5] [6] [7] [8] [1] measure- ment pin input pin 04 0c 02 0a 06 05 03 81 47 c7 27 a7 67 ????? 00 39 ? 12 ? 2 15 03 04 0c 02 0a 06 81 07 1 00 32 31 30 11121 05 1b 04 0c 02 0a 06 91 07 00 32 31 41,42 41,42 04 0c 02 0a 06 1 1 1 2 1 05 03 81 47 c7 27 a7 67 00 39 41,42 41,42 04 0c 02 0a 06 1 1 1 2 1 05 03 81 47 c7 27 a7 67 00 39 41,42 41,42 symbol vmonl vos vmax vmonr rr vst 6.5 0 4.0 11.3 31 0.65 min. 8.5 30 4.8 13.3 ? 1.35 typ. 10.5 200 ? 15.3 ? 1.7 max. db mv v db db v unit ? ? vp-9690a (average value detection, effective value display) din audio filter by matsushita communication is used for ? measurement. design against radiation-proof is not made.
BH3874AKS2 audio ics ! ! ! ! measurement circuit 10 vcc 10 4.7 4.7 2.2 2.2 2.2 2.2 2.2 2.2 0.22 10 10 10 10 10 10 10 10 10k 0.1 ? 0.047 ? 0.22 ? 0.22 ? 0.22 ? 0.22 ? 0.022 ? 0.022 ? 0.022 ? 0.022 ? 0.01 ? 0.01 ? 0.01 ? 0.01 0.0022 ? 0.0022 ? 0.1 ? 0.1 ? 0.1 ? 0.1 ? 4700p ? 0.047 100k ? 150k sw8 ? 0.1 ? 3.3k ? 68k ? 22k ? 47k ? 47k ? 15k ? 15k 220 ? 0.22 10 ? 0.068 ? 0.068 ? 0.068 ? 0.1 ? 0.22 ? 0.1 10k 10k clock latch data ? 9.1k 10k 15k 10 51k sw3 sw2 sw1 1 1 1 2 3 4 2 2 ? 47k ? 47k ? ? 15k ? 0.068 ? 0.068 ? 0.068 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 outl outr vcc cap filter bass5 bass4 bass3 bass2 bass1 hpfr3 hpfr2 hpfr1 hpfl3 hpfl2 hpfl1 alcc alcr recl recr BH3874AKS2 (sqfpt64) vfc1 gnd vfc2 mic dpll1 dpll2 dplr1 dplr2 ps1 ps2 f1l1 f1l2 f1r1 f1r2 f2l1 f2l2 f2r1 f2r2 f3l1 f3l2 f3r1 f3r2 f4l1 f4l2 f4r1 f4r2 f5l f5r inrd inld inrc inlc inrb inlb inra inla bpnf bpout c b a sck si stepc 64 12345678910111213141516 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 62k 51k sw6 sw5 sw4 1 1 1 2 3 4 2 2 1 1 2 2 sw7 thd 10k thd dpl fig.1 recommendable external parts 1. element marked with ? carbon-film resistor : 1% film capacitor : 1% ceramic capacitor : 1% film capacitor : 20% electrolytic capacitor : 20% 2. unless specified particularly, use the following external parts: carbon-film resistor : 5% notes on wiring 1. gnd shall be wired solidly. 2. wiring pattern of si and sck shall be away from that of analog unit and cross talk shall not be acceptable. 3. lines of si and sck shall not be parallel if possible. the lines shall be shielded, if they are adjacent to each other.
BH3874AKS2 audio ics ! ! ! ! circuit operations timing of control signal 90% 90% 90% 10% 10% 10% tw tsu th ts tw(latch) tw(data) tw sck (clock signal) 35pin 34pin si data signal latch signal fig.2 data (si) is read at a rising edge of clock. data is fixed by the rising edge of latch. be sure to set sck and si to low after latching. when the clock signal is high, it doesn?t accept latch signal. constant of timing chart (ta=25 c) parameter hold time (clock clock) "high" input voltage "low" input voltage clock width "middle" input voltage setup time (data, clock latch) ? serial signal si is judging data and latch in the difference of the voltage level. ? in the application schematic, it is changing 0-5v 3 line serial data into the 2 line serial data at the voltage with the resis tance and the diode of the external. we request enough examination, because there is a case where the voltage which is changed by the ability for the microcomput er to drive and the external parts. data width latch width setup time (data clock) symbol v ih v im v il tw tw (data) tw (latch) tsu th ts 3.3 1.8 ? 0.3 2.0 4.0 2.0 1.0 1.0 1.0 2.0 0 ? 2.4 1.2 ? 5.0 6.0 ? ? ? ? ?? ? ? ? ? v v s v s s s s s min. typ. max. unit
BH3874AKS2 audio ics when transmitting more than one piece of data at once, we request the following serial control transmission. (1) timing of serial data and latch 8bit data time [1] [2] cf. (2) [3] fig.3 data data&latch latch ?? || 8bit data 8bit data 8bit data 8bit data 8bit data 8bit data 8bit data 8bit data 8bit data latch width the time which transmits more than one piece of data at once the time which sends more than one piece of the following data after sending more than one pirce of data (when the capacitor of 33 pin is 0.22 f.) parameter more than 2.0 s less than 2.5ms more than 100ms time (2) about the order which transmits more than one piece of data at once when transmitting more than one piece of data including [1], [2] or [3] at once, transmit data of [1], [2] or [3] of the data format first. in case of transmitting some data from [1] until [8], transmit only necessary data in order from [1]. (3) about data needing the timing of (1) data needing the timing of (1) are data [1], [2] and [3]. even if one data of data [1], [2] and [3] is transmitted, follow the timing of (1). in case of transmitting some data from [4] until [8], the timing of (1) need not be followed. in the case, there are no problems if the constant of timing chart in the preceding page is satisfied.
BH3874AKS2 audio ics (4) relation of the serial data and 33pin capacitor the interval of the data and the data can be more shortly set by changing the capacitor of 33pins. (ex. when making the changing speed of volume faster) the relation between the interval of the data and the data and the capacitor of 33pin is as follows. note: it is possible to do the interval of the data and the next data more shortly by changing 33pin capacitor into 0.047 f. however, the switching sound becomes rather bigger than the switching sound of setting 0.1 f about the switching sound of volume, dbass, surround, mode selector. 0.047 f 0.1 f 0.22 f 33pin capacitor more than 25ms more than 50ms more than 100ms the interval of the data and the next data (5) others if there is common impedance in gnd of the ic, the switching sound something occurs by changing the mode. wiring pattern of si and sck shall be away from that of analog unit and cross talk shall not be acceptable.
BH3874AKS2 audio ics serial control data format d00 000 101 011 100 010 110 001 111 d01 d02 d03 d05 d06 d07 d04 d10 d11 d12 d13 d15 d16 d17 d14 d20 d21 d22 d23 d25 d26 d27 d24 d30 volume mode selector dynamic bass / biamp graphic equalizer f1 / f2 greq 0 : f1 1 : f2 greq 0 : f3 1 : f4 dpl 0 : off 1 : on dynamic bass / biamp surround effect mic rec out d31 d32 d33 d35 d36 d37 d34 d40 d41 d42 d43 d45 d46 d47 d44 d50 d51 d52 d53 d55 d56 d57 d54 d60 d61 d62 d63 d65 d66 d67 d64 d70 d71 d72 d73 d75 d76 d77 d74 as for the mark, it becomes a soft switch method. as for functions of the and mark, measures to reduce step noise are done. because the functions of no marks have no measures of step noise, please supply mute. as for the mark, it takes measures to decrease dc offset voltage. graphic equalizer f3 / f4 graphic equalizer f5 input selector spectrum analyzer surround / stereo ? ? ? don't care [1] [2] [3] [4] [5] [6] [7] [8]
BH3874AKS2 audio ics [1] volume attenuation d04 d05 0 d06 0 d07 0 d00 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 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 1 1 1 1 1 1 att quantity ? 0.0db ? 2.0db ? 4.0db ? 6.0db ? 8.0db ? 10.0db ? 12.0db ? 14.0db ? 16.0db ? 18.0db ? 20.0db ? 22.0db ? 24.0db ? 26.0db ? 30.0db ? 28.0db ? 32.0db ? 34.0db ? 36.0db ? 38.0db ? 40.0db ? 44.0db ? 48.0db ? 52.0db ? 56.0db ? 60.0db ? 64.0db ? 68.0db ? 72.0db ? 76.0db ? 82.0db d01 d02 d03
BH3874AKS2 audio ics [2] mode selector, mic, rec out d14 d15 1 mic 0 : on 1 : mute rec out 0 : on 1 : mute d16 0 d17 1 0 1 0 1 0 1 0 1 d10 through through through through vocal fade lch monaulal rch monaulal l + r mode 0 0 1 1 0 0 1 1 d11 0 0 0 0 1 1 1 1 d12 d13 note : about input selector, mode selector is cleared when mute of the input selector is chosen. when mute of the input selector is canceled, choose the mode selector, too. the mute command of the input selector has priority over the command of the mode selector. [3] dynamic bass / biamp effect, surround effect (a) dynamic bass / biamp effect the effect quantity in biamp is different from the value of the below table. d24 d25 0 refer to the surround effect d26 1 d27 1 0 1 0 1 0 1 0 1 d20 0db 0db 3db 6db 9db 12db 15db 18db gain 0 0 1 1 0 0 1 1 d21 0 0 0 0 1 1 1 1 d22 d23 (b) surround effect the effect quantity in simulated stereo mode is different from the value of the below table. d24 d25 0 refer to the dynamic bass effect d26 1 d27 1 d20 0db 3db 6db 9db gain d21 0 1 0 1 0 0 1 1 d22 d23 note : gain is the name given to the transfer data. depending on the values of the external constant, the specified gain may not be output.
BH3874AKS2 audio ics [4] graphic equalizer f1 / f2 note : gain is the name given to the transfer data. depending on the values of the external constant, the specified gain may not be output. d34 greq select 0 : f1 1 : f2 d35 1 d36 0 d37 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 1 0 d30 + 12db + 12db + 10db + 8db + 6db + 4db + 2db 0db 0db ? 2db ? 4db ? 6db ? 8db ? 10db ? 12db ? 12db gain 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 d31 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 d32 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 d33 [5] graphic equalizer f3 / f4 note : gain is the name given to the transfer data. depending on the values of the external constant, the specified gain may not be output. d44 greq select 0 : f3 1 : f4 d45 0 d46 1 d47 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 1 0 d40 + 12db + 12db + 10db + 8db + 6db + 4db + 2db 0db 0db ? 2db ? 4db ? 6db ? 8db ? 10db ? 12db ? 12db gain 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 d41 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 d42 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 d43
BH3874AKS2 audio ics [6] graphic equalizer f5, dpl note : gain is the name given to the transfer data. depending on the values of the external constant, the specified gain may not be output. d54 dpl select 0 : off 1 : on d55 1 d56 1 d57 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 1 0 d50 + 12db + 12db + 10db + 8db + 6db + 4db + 2db 0db 0db ? 2db ? 4db ? 6db ? 8db ? 10db ? 12db ? 12db gain 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 d51 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 d52 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 d53 [7] input selector, dynamic bass / biamp, surround / simulated stereo d64 d65 0 0 : dynamic bass 1 : biamp 0 : surround 1 : simulated stereo d66 0 d67 1 0 1 0 1 0 1 0 1 d60 mute input-la, input-ra input-lb, input-rb input-lc, input-rc mute mute input-ld 1 , input-rd 1 (0db) input-ld 2 , input-rd 2 ( ? 9db) input 0 0 1 1 0 0 1 1 d61 0 0 0 0 1 1 1 1 d62 d63 [8] spectrum analyzer d74 d75 1 ? ? d76 1 d77 1 0 1 0 1 0 1 0 1 d70 reset reset fo=105hz fo=340hz fo=1khz fo=3.4khz fo=10.5khz priority over parallel data frequency 0 0 1 1 0 0 1 1 d71 0 0 0 0 1 1 1 1 d72 d73 ? don't care
BH3874AKS2 audio ics parallel control 36pin 0 0 0 0 1 1 1 1 a 37pin 0 0 1 1 0 0 1 1 b 38pin 0 1 0 1 0 1 0 1 c reset 105hz 340hz reset 1khz reset 3.4khz 10.5khz bpout (39pin) when serial control is done, a parallel control isn?t received. when the serial control is ?parallel priority?, a parallel control on the left is received. when changing the frequency of spectrum analyzer, transmit the command of the following frequency after transmitting a reset command.
BH3874AKS2 audio ics ! ! ! ! application example 10 vcc 10 4.7 4.7 2.2 2.2 2.2 2.2 2.2 2.2 0.22 10 4.7 4.7 10 10 10 10 10 0.1 0.047 0.047 0.22 0.22 0.22 0.22 0.022 0.022 0.022 0.022 0.01 0.01 0.01 0.01 0.0022 0.0022 0.1 0.1 0.1 0.1 4700p 100k 150k 0.1 3.3k 68k 22k 47k 47k 15k 15k 220 0.22 0.068 0.068 0.068 0.1 0.22 0.1 clock latch data 9.1k 10k 15k 10 47k 47k 15k 0.068 0.068 0.068 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 outl outr vcc cap filter bass5 bass4 bass3 bass2 bass1 hpfr3 hpfr2 hpfr1 hpfl3 hpfl2 hpfl1 alcc alcr recl recr BH3874AKS2 (sqfpt64) vfc1 gnd vfc2 mic dpll1 dpll2 dplr1 dplr2 ps1 ps2 f1l1 f1l2 f1r1 f1r2 f2l1 f2l2 f2r1 f2r2 f3l1 f3l2 f3r1 f3r2 f4l1 f4l2 f4r1 f4r2 f5l f5r inrd inld inrc inlc inrb inlb inra inla bpnf bpout c b a sck si stepc 64 12345678910111213141516 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 62k dpl fig.4
BH3874AKS2 audio ics ! ! ! ! operation notes (1) about operation voltage supply range within operation voltage supply range, basic circuit function operation is guaranteed within operation ambient temp. but please confirm set up constant and element, voltage set up and temp set up on use. (2) about operation temp range. if it within recommended operation voltage range, circuit function operation is guaranteed within operation temp. it corralled to conditions of power dissipation to temp. please watch out except condition stipulated by electrical characteristics within the range. it cannot guarantee standard value of electrical characteristics. but it retains original function. (3) about application circuit example of application circuit drawing is convinced as recommendable. but please confirm characteristic including above mentioned noticed. at use with modification of external constant, please decide with enough margin considering distribution, etc of this ic, external parts including quiescence characteristics and excessive characteristics. please note that we have not yet confirmed any concerned patent rights completely. (4) about 2-wire serial control high-frequency digital signal is inputted into the sck terminal and si terminal. so wire and print patterns suitably to prevent interference to analog signal system line (especially to input line). (5) about ground line please connect ic?s ground to the ground of a set with one point. when the ic has common impedance to the ground line, pop noise may occur in function switching. (6) about schmidt circuit this ic has the schmidt circuit as preventive measures against logic signal input into the data (34pin) and clk (35pin) terminals. therefore, this ic is not affected so much by noise to a logic signal line. (7) about power on/off at on of power supply or off of power supply pop noise occurs. therefore, please supply mute. (8) setting of spectrum analyzer minimum light level output offset voltage may shift due to the surrounding conditions (temperature, stresses, etc.). therefore when setting the spectrum analyzer minimum light level, leave a margin (more than 30% to spectrum analyzer output offset voltage vos). ! ! ! ! electrical characteristic curves frequency : f (hz) note : this graph is shown at the input common-mode. gain at the input inverting-mode is 6db. gain (db) phase (deg) fig.5 vocal fade characteristics 10 phase 100 1k 10k 100k ? 45 ? 40 ? 35 ? 30 ? 20 ? 25 ? 15 + 15 ? 5 + 5 ? 10 + 10 + 0 ? 200 ? 175 ? 150 ? 125 ? 75 ? 100 ? 50 + 200 + 100 + 150 ? 25 + 175 + 125 + 0 + 50 + 75 + 25 gain frequency : f (hz) gain (db) phase (deg) fig.6 surround characteristics 10 100 1k 10k 100k ? 25 ? 20 ? 15 ? 10 + 0 ? 5 + 5 + 15 + 25 + 10 + 20 ? 200 ? 175 ? 150 ? 125 ? 75 ? 100 ? 50 + 200 + 0 + 75 ? 25 + 175 + 100 + 125 + 150 + 50 + 25 gain phase frequency : f (hz) bass (db) fig.7 graphic equalizer characteristics 10 100 1k 10k 100k ? 4 ? 2 + 0 + 2 + 6 + 4 + 8 + 20 + 22 + 24 + 12 + 16 + 10 + 18 + 14
BH3874AKS2 audio ics frequency : f (hz) gain (db) fig.8 biamp characteristics (input common-mode) 10 100 1k 10k 100k + 4 + 6 + 8 + 12 + 10 + 14 + 26 + 28 + 30 + 34 + 32 + 18 + 22 + 16 + 24 + 20 15db 12db 9db 6db 3db 18db input-output distoration characteristics : (vrms) output (vrms) total harmonic distortion : thd (%) fig.9 input-output distortion characteristics 1m 10m 100m 1 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2 5 0.001 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 vout thd ! ! ! ! external dimensions (units : mm) sqfp-t64 48 33 32 17 1 49 64 12.0 0.2 14.0 0.3 0.3 0.1 12.0 0.2 14.0 0.3 0.5 0.1 0.1 1.4 0.1 0.125 0.1 0.65 16 0.15
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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