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1 video ics single chip hi-fi audio signal processor BH7801BK the BH7801BK incorporates the functions for a vhs audio signal processing system on a single chip. the circuits on the chip are a peak-noise reduction processor (pnr), an fm modulator / demodulator circuit, an i / o switcher, an automatic fm detector circuit, an fm bandpass filter, and a regulator circuit. 1) operates off dual power supply which allows a large reduction in the number of coupling capacitors required. a built-in regulator makes it easy to con- struct a power supply system. 2) a two-line i 2 c bus control decoder circuit is provid- ed, allowing the various ic modes to be set using serial control. 3) a four line input switcher is included (tuner, bs, and line 1 / 2). the output switcher can switch between streo, left, and right, and hi-fi, mix, and normal, and a bs monitor function is also pro- vided. 4) the pnr processor and fm modulator / demodula- tor circuit have reversed characteristics at recording and playback. in addition, the adjustment for carrier frequency and fm deviation / playback level are common. 5) the built-in bandpass filter excels at attenuation of other channels, and can be directly coupled to the playback amplifier. the fm recording output block has a high-performance low-pass filter to produce sine wave output. 6) slope-control-type fm-switching-noise compensa- tion circuit. 7) envelope detector circuit and noise-detector-type automatic fm detector circuit. 8) vco that uses the color signal sub-carrier frequency f sc (ntsc: 3.579545mhz, pal: 4.433619mhz) and auto-adjusting bpf circuit ensure stable adjustment with no fluctuation due to mounting stress or time. features applications vcrs absolute maximum ratings (ta = 25?) parameter applied voltage storage temperature v cc v ee v in tstg 18, 36pin 6.0 39pin ?6.0 5, 6, 32pin 6.5 pins other than the above 6.0 ?55 ~ + 125 v symbol limits unit v v v in v power dissipation pd 850 * mw operating temperature topr ?10 ~ + 70 c c * reduced by 8.5mw for each increase in ta of 1 c over 25 c when mounted on a 70mm 70mm, t = 1.6mm glass epoxy board.
2 video ics BH7801BK block diagram 33 32 31 30 29 28 27 26 25 24 23 1 input switch mix amp pnr enve lope hi-fi det modem alc data decoder modem fmbpf vco bpf auto adjust d.o. com. fm out sw 2 3 reg 4 5 6 7 8 9 10 11 tuner r in tuner l in tuner m in hi-fi alc scl sda gndd fsc in nr tc l wtng l nr emph l line2 r in mute ctrl normal out line l out line r out mix out mix alc normal in nr tc r wtng r nr emph r dc fb r fm rec out audio head sw pulse in fm alc vccm vco fo adj bpf adj gndm enve out / adj flag / hi-fi det fm pb in dc fb l line2 l in vrefp v cc erp gnd v ee line1 r in line1 l in erm bs r in bs l in 34 35 36 37 38 39 40 41 42 43 44 22 21 20 18 17 16 15 14 13 12 line amp line amp output switch pnr 19
3 video ics BH7801BK pin descriptions pin no. pin name i / o circuit pin voltage function 2, 1, 3 tuner in l, r, m 150k w 0.0v tuner input (l, r, m) 4 hi-fi alc ef (npn) ~ 200 w 0.0v alc time constant setting for hi-fi audio 5 scl b (pnp) clock input for i 2 c bus control 6 sda b (pnp) data input for i 2 c bus control 7 gndd gnd for i 2 c bus control 8 fsc in 200k w 0.0v 9, 25 nr tc l, r ?5.0v f sc input for vco and bpf adjustment 12, 22 dc fb l, r 11.5k w 0.0v pnr operating reference potential point 15 gndm 0.0v gnd for pnr, modem and bpf 16 bpf f 0 adj ef (npn) ~ 200 w 1.9v center frequency adjustment for fm bpf 17 vco f 0 adj ef (npn) 2.5v vco control current setting 18 vccm 5.0v v cc for modem and bpf 19 fm alc ef (npn) ~ 2.5k w 0.0v fm alc time constant setting 20 ahswp in b (pnp) audio head switching pulse input 26 normal in 50k w 0.0v normal input 28 mix out ef (npn) 0.0v mixer amplifier output for rf converter 30, 29 line l, r out 330 w 0.0v line output 31 normal out ef (p-p) 0.0v normal output 32 mute ctrl 3k w ( > 2.5v) line output mute control input 34, 33 line2 l, r in 88k w 0.0v line2 input (l, r) 36 v cc 5.0v v cc regulator 37 erp c (npn) 5.0v v cc regulator error output 38 gnd 0.0v i / o switch gnd 39 v ee ?5.0v v ee regulator 41, 40 line1 in l, r 88k w 0.0v line1 input (l, r) 42 erm c (pnp) ?5.0v v ee regulator error output 44, 43 bs in l, r 88k w 0.0v bs input (l, r) pnr attack and recovery time setting. attack r: 530 w , recovery r: 6.5k w 10, 24 wtng l, r 0.0v waiting characteristic, treble time constant (external c = 0.022 m f) 11, 23 nr emph l, r 0.0v nr emphasis time constant setting (external c = 0.0047 m f) 13 fm pb in 100k w 0.0v playback fm input 660mv p-p typ. input coupling capacitor (gnd ~ v cc ) 21 fm rec out ef (npn) ~ 200 w ee: 3.3v ee: recording fm output, sine wave output pb: fm bpf output monitor 27 mix alc ef (npn) ~ 500 w ?5.0v alc time constant setting for mixer amplifier. attack and recovery time setting 35 vrefp 10k w 2.5v v cc / 2 reference voltage (power on detect and pre-charge functions) 14 / adj flag / hi-fi det enve out ee: 50k w ee: 0.8v pb, adj: ef (npn) pb: 1.0v fm lch signal component envelope output / hi-fi det output / adj flag output for adj * i / o circuit; ef: emitter follower, p-p: push pull, b: base, and c: collector all numerical values are standardized values.
4 video ics BH7801BK input / output circuits tuner l / r / m in (2, 1, 3pin) line1, line2, bs l / r in (34, 33, 41, 40, 44, 43pin) line l / r out (30, 29pin) mix out (28pin) fm rec out (21pin) fm pb in (13pin) v cc v ee gnd 1 3k (2, 3pin) ?2.0v 2.0v 150k v cc v ee gnd 33 58k (34, 40, 41, 43, 44pin) ?2.0v 2.0v 30k v cc v ee gnd 200 21 8k 200 v cc v ee gnd 200 5k 47k 200 28 3p v cc v ee gnd 2k 50k 13 12.5k 3.5v 100k 20p pb v cc v ee gnd 25k 330 30 (29pin) 11.56k 26k 30k 50 50
5 video ics BH7801BK ahswp in (20pin) enve out / adj flag / hi-fi det (14pin) scl (5pin) sda (6pin) mute ctrl (32pin) fsc in (8pin) v cc v ee gnd 20 5k v cc v ee gnd 14 50k 200 42.5k 30k pb v cc v ee 5 30k 3v v cc v ee gnd 32 v cc v ee gnd 2k 50k 100k 100k 50k 16k 200 10k 2.5v 51k 10k 2k v cc v ee 6 30k 90 3v 8
6 video ics BH7801BK electrical characteristics (unless otherwise noted, ta = 25?, unreg ?v cc = + 10v, unreg ?v ee = ?10v) ?output switch control (w2d3, w2d4, w2d5) : stereo ?bs l2 through / line mute control (w2d6, w2d7) : bsl2 through / line mute off ?line amp gain control (w2d1, w2d2) : typ. ( + 9.8db) ?fm output cotrol (w1d3) : fm output on ?fm out switch control (w1d4, w1d5, w1d6) : fm rec output, mix ratio 1 ( ?12.5db) ?ntsc / pal control (w1d8) : ntsc ?recording mute (w1d7) : recording mute ?hi-fi pb mute (w2d8) : off ?normal input switch control (w3d4, w3d5) : hi-fi mix ?hi-fi alc control (w3d8) : off ?envelope gain (typ. / 4db) control (w4d4) : typ. ?fm detector level control (w4d1, w4d2) : typ. ?enve characteristic control (w4d3) : fnorm detect, no enve output ?fm test control (w4d6) : off ?fm alc control (w4d5) : alc on ?mute control (pin 32) : l (mute) signal frequency f = 1khz ?input condition 1: tu in v in = ?20dbv, line1 / line2 / bs v in = ?10.2dbv ?input condition 2: tu in v in = ?9.8dbv, line1 / line2 / bs v in = 0.0dbv ?input condition 3: tu in v in = ?2.0dbv, line1 / line2 / bs v in = 8.0dbv modem carrier frequency ntsc lch 1.30mhz modem carrier frequency ntsc rch 1.70mhz modem carrier frequency pal lch 1.40mhz modem carrier frequency pal rch 1.80mhz fsc ntsc 3.579545mhz fsc pal 4.433619mhz
7 video ics BH7801BK parameter regulator ? * 1: b.w. = 0.4 to 30khz * 2: din audio symbol min. typ. max. unit conditions quiescent current (positive supply) ee i qpee ma 30.0 40.0 53.0 ee mode, after carrier frequency adjustment with no input quiescent current (positive supply) pb i qppb ma 40.0 54.0 72.0 pb mode, carrier frequency adjustment fnorm, after bpf adjustment quiescent current (negative supply) ee i qmee ma ?20.0 ?15.0 ?11.0 ee mode, after carrier frequency adjustment with no input pb mode, carrier frequency adjustment fnorm, after bpf adjustment quiescent current (negative supply) pb i qmpb ma ?22.0 ?16.0 ?12.0 input condition 2 alc on alc level v alc dbv ?3.8 ?1.8 + 0.2 input condition 2, * 1 alc on alc distortion thd alc % 0.03 0.25 relevant input: shorted to gnd non-relevant input: input condition 2, * 2 crosstalk ct ee dbv ?88.0 ?70.0 input condition 1 l&r input together, * 1 normal out output level v onorm dbv ?21.5 ?20.0 ?18.5 input condition 1 l&r input together output level v omix dbv ?12.5 ?10.5 ?8.5 input condition 1 l&r input together, * 1 distortion thd mix % 0.08 0.50 input condition 2 l&r input together mix alc level v alcmix dbv ?4.7 ?2.7 ?0.7 v in = ?10.2dbv output level v obs v ol2 dbv ?11.7 ?10.2 ?8.7 v in = ?10.2dbv, * 1 distortion thd bs thd l2 % 0.005 0.09 bs in pin shorted to gnd, * 2 output residual noise v onbs v onl2 dbv ?99.0 ?85.0 ee through ? ( input: tu in l / r, line1 in l / r, line2 in l / r, bs in l / r output: line out l / r) bs / l2 through ? ( input: bs / l2 in l / r output: line out l / r) line amp ? ( input: normal in output: line out l / r) mix amp ? ( input: tu in l / r, line1 in l / r, line2 in l / r, bs in l / r output: mix out) regulator input voltage (positive) v cc v 4.75 5.10 5.45 regulator input voltage (negative) v ee v ?5.35 ?5.00 ?4.65 line output level v oee dbv ?11.7 ?10.2 ?8.7 input condition 1 channel balance (l / r) cb ee db ?0.8 0.0 0.8 input condition 1 distortion thd ee % 0.017 0.10 input condition 1, * 1 maximum output level v omee dbv 8.3 10.7 ? thd = 1%, * 1 output residual noise v onee dbv ?94.0 ?86.0 relevant input shorted to gnd, * 2 muting level mt ee dbv ?103 ?90 input condition 2, * 2 line amplifier gain1 v oline1 db + 8.8 + 9.8 + 10.8 v in = ?20dbv (input: tu l / r, line1 l / r, line2 l / r, bs l / r, tu m in output: normal out)
8 video ics BH7801BK parameter * 1: b.w. = 0.4 to 30khz * 2: din audio symbol min. typ. max. unit conditions fm mix ratio (fm mix1 mode) f lr db ?14.5 ?12.5 ?10.5 spectrum ratio 1.30mhz / 1.70mhz modem rec mode ? ( input: tuner in l / r, line1 in l / r, line2 in l / r, bs in l / r output: fm rec out) modem pb mode ? ( input: m pb in, output: line out l / r) carrier setting resistor, after bpf f 0 adjustment, v in = 660mv p-p , 1.30mhz, 1.70mhz mix in recording ? playback overall characteristics ? (ee?nput: line in l / r, output: line out l / r) ( pb?nput: fm pb in, output: line out l / r) carrier frequency, after adjusting bpf pb mode: fm pb in = 660mv p-p ee mode: input condition 1 f = 1.30mhz, 1.70mhz 1: 1 mix, the difference between the ee and pb line out levels when input is dev = dev l, r (the frequency deviation given above) no input, after automatic adjustment ntsc carrier frequency lch rch f nol mhz 1.2905 1.2975 1.3045 f nor mhz 1.6920 1.6990 1.7060 no input, after automatic adjustment pal carrier frequency lch rch f pol mhz 1.3910 1.3980 1.4050 f por mhz 1.7925 1.7995 1.8065 input condition 1 frequency deviation lch rch dev l khz 43.0 49.0 55.0 dev r khz 44.5 50.5 56.5 input condition 3 (f = 10khz) maximum frequency deviation lch rch devmax. l khz 118 140 162 devmax. r khz 118 140 162 fm out sw: fm l mode fm out sw: fm r mode fm output level lch rch v ofml mv p-p 300 355 410 v ofmr mv p-p 310 365 420 dev l = 50.0khz, f = 1khz dev r = 50.0khz, f = 1khz demodulation output level 1 demodulation output level l / r difference demodulation output level 2 lch rch v odl dbv ?12.7 ?10.2 ?7.7 v odr dbv dev l = 50.0khz, f = 10khz lch v odl2 dbv dev r = 50.0khz, f = 10khz rch v odr2 dbv ?12.7 ?10.2 ?7.7 v odl ?v odr d v od db ?1.6 0.0 + 1.6 dev l = 50.0khz, f = 1khz, * 1 dev r = 50.0khz, f = 1khz, * 1 demodulation distortion lch rch thd dl % 0.12 0.35 thd dr % 0.13 0.35 unmodulated * 2 demodulation noise level line output recording / playback level difference lch rch lch v ondl dbv ?98.0 ?86.0 v ondr dbv ?98.0 ?86.0 lch v odswl db ?20.0 ?19.0 rch v odswr db ?20.0 ?19.0 v rpl db ?1.2 0.0 + 1.2 rch v rpr db ?1.2 0.0 + 1.2 spectrum ratio of 2nd harmonic with respect to fundamental lch: fm l mode, rch: fm r mode spectrum ratio of 3nd harmonic with respect to fundamental lch: fm l mode, rch: fm r mode carrier 2nd harmonic lch rch f 2l db ?53.0 ?40.0 f 2r db ?48.0 ?40.0 carrier 3rd harmonic lch rch f 3l db ?52.0 ?40.0 f 3r db ?55.0 ?40.0 v odl ?10.0 v odl ?7.8 v odl ?5.6 v odr ?10.0 v odr ?7.8 v odr ?5.6 demodulation sw noise level ahswpin: 30hz, 5v p-p fmpbin: dev. = 40khz (f = 10khz) relative ratio of actual values of f c = 3khz, ?48db / oct. after passing through lpf, and f c = 20khz, ?48db/oct. after passing through lpf.
9 video ics BH7801BK parameter symbol min. typ. max. unit conditions ntsc lch bpf l / r level difference ntsc d v bpfn db ?5.0 0.0 5.0 after automatic adjustment, ntsc f = 1.505mhz, v in = 200mv p-p bpf l / r level difference pal d v bpfp db ?5.0 0.0 5.0 after automatic adjustment, pal f = 1.605mhz, v in = 200mv p-p fm bpf ? (input: fm pb in, output: bpf monitor l / r) lch, rch mix input signal level ? 660mv p-p (ratio 1: 1) 1.30mhz insertion loss att nlc db ?14.1 ?11.1 ?8.1 1.30mhz + 1.70mhz fm alc on 1.15mhz attenuation db 1.15mhz + 1.70mhz att nlc ?9.8 att nl 1.15 att nlc ?5.3 att nlc ?2.3 1.45 1.45mhz attenuation db 1.45mhz + 1.70mhz att nlc ?8.1 att nl att nlc ?5.0 att nlc ?2.5 1.70 1.70mhz attenuation db 1.30mhz + 1.70mhz att nl att nlc ?30.0 ntsc rch pal lch 1.70mhz insertion loss att nrc db ?15.3 ?12.3 ?9.3 1.30mhz + 1.70mhz fm alc on 1.40mhz insertion loss att plc db ?12.9 ?9.9 ?6.9 1.40mhz + 1.80mhz 1.55mhz attenuation db 1.55mhz + 1.30mhz att nrc ?8.8 att nr 1.55 att nrc ?5.7 att nrc ?3.4 1.85 1.85mhz attenuation db 1.85mhz + 1.30mhz att nrc ?9.5 att nr att nrc ?4.7 att nrc ?1.4 1.30 1.30mhz attenuation db 1.30mhz + 1.70mhz att nr att nrc ?30.0 1.80 1.80mhz attenuation db 1.40mhz + 1.80mhz att pl att plc ?30.0 pal rch fnorm ? hi-fi recovery delay circuit ? 1.80mhz insertion loss att prc db ?14.3 ?11.3 ?8.3 1.40mhz + 1.80mhz envelope output level sp0 v envsp0 mv 0 100 no signal, standard mode envelope output level sp1 v envsp1 v 2.08 2.58 3.08 v in = 0db, standard mode envelope output level sp2 v envsp2 v 3.70 3.95 4.20 v in = + 10db, standard mode envelope output level ep1 v envep1 v 1.96 2.46 2.96 v in = ?4db, + 4db mode return delay time t fndly ms 110 125 140 delay time from input of fm pb in (1.30mhz, 1.70mhz 1: 1 mix) 660mv p-p to rise of enve out audio head pulse in : f = 30hz, 5v p-p , rectangular wave 1.40 1.40mhz attenuation db 1.40mhz + 1.80mhz att pr att prc ?30.0 envelope output circuit ? (input: fm pb in, output: enve out) 0db = 660mv p-p , 1.3mhz&1.7mhz mix input
10 video ics BH7801BK parameter control system mode holding voltage ? symbol min. typ. max. unit conditions clock in l mode holding voltage v h5l v 0.0 0.5 h mode holding voltage v h5h v 2.5 v cc data in l mode holding voltage v h6l v 0.0 0.5 h mode holding voltage v h6h v 2.5 v cc mute ctrl mute holding voltage v h32l v 0.0 1.0 dc mute holding voltage v h32h v 3.9 v cc
11 video ics BH7801BK measurement circuit 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 34 35 36 37 38 39 40 41 42 43 44 22 21 20 18 17 16 15 14 13 12 22k 22k 27k 27k 100 m 100 m 10k 47 m v ee v ee 47 m 10 m 2.2m 1500p fm rec out 4.7 m 100 m 100 m 47k envelope / hi-fi det / aaa flag fm pb in ahswp in normal out mute ctrl line l out 22k 1500p line r out 1k normal in mix out fsc in data clock 0.022 m 0.01 m 0.0047 m 0.022 m 10 m 0.0047 m 0.022 m s41 1k line1 l in 4.7 k s43 1k bs r in 4.7 k s44 1k bs l in 4.7 k s1 1k tuner r in s2 1k tuner l in s3 1k tuner m in s40 1k line1 r in 4.7 k v cc vccs vees s34 1k line2 l in 4.7 k s33 1k line2 r in 4.7 k 4.7 k 4.7 k v ee v ee 47 m 2.2m 19 input switch mix amp pnr enve lope hi-fi det modem alc data decoder modem fmbpf vco bpf auto adjust d.o. com. fm out sw reg line amp line amp output switch pnr fig.1
12 video ics BH7801BK circuit operation function table the BH7801BK includes the following functions on one chip. block name main function power supply pin numbers no. regulator 35 ~ 39, 42 1 i 2 c bus control ?i 2 c bus data decoder 5 ~ 7 2 unre-v cc : + 10v gnd: 38 unreg-v ee : ?10v v cc (internally wired) gnd: 38 v ee (internally wired) ? 5v regulator (v cc, v ee ) ?anti-pop circuit (anti-pop) fm bpf 13, 16, 19 9 ?fm bandpass filter (fm bpf) ?fm input automatic level adjust circuit (fm alc: on / off) ?ntsc / pal switch function v cc : 18 gnd: 15 ?tuner (l, r, m) / line 1, 2 (l,r) / bs (l, r) switch v cc3 (internal power supply) gnd: 7 27 ~ 30 32 input switcher 33, 34, 40, 41 43, 44 1 ~ 3 3 v cc (internally wired) gnd: 38 v ee (internally wired) ?line amplifier: + 9.8db, + 10.3db, + 11.3db, + 14.0db ?mix on / off switch ?stereo / left / right / normal switch ?mute switch ?mixer amplifier for rf converter (with alc function) ?20khz line low-pass filter (secondary lpf) ?pnr processor (moa, cca, wtng, det) ?20khz pnr low-pass filter (secondary lpf) ?emphasis / de-emphasis (emph / deemph) ?switching noise slope-control type differential compensation circuit ?bs / line2 through mode ?fm modulation circuit (vco, dev) : fm mix1 to 4, fm l, fm r, bpf l, bpf r ?fm demodulation / fm bpf monitor output switch (fmout sw) ?recording fm treble cutoff filte (fm lpf) ?over modulation limiter (audio lim) ?vco, bpf automatic adjustment circuit (auto audio adjust) ?ntsc / pal switch function ?auto adjustment complete flag output circuit (adj flag) ?playback fm limiter (fm lim) output switcher 4 9 ~ 12 22 ~ 25 v cc (internally wired) gnd: 38 v ee (internally wired) pnr processor 6 ?d.o.detector circuit (d.o. det) : typ. + 10%, ?10% ?auto fm detector circuit (noise detect method) (fm det) ?envelope detector circuit (enve) ?hold pulse generator v cc : 8 gnd: 15 (internally wired) fm detector control 14, 20 8 8, 14 17, 21 v cc : 18 gnd: 15 v ee (internally wired) modulator 7
13 video ics BH7801BK application example 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 34 35 36 37 38 39 40 41 42 43 44 22 21 20 18 17 16 15 14 13 12 mute: h 27k 27k 100 m 100 m 47 m 47 m 10 m 2.2m 1500p fm rec out 4.7 m 100 m 100 m envelope / hi-fi det / aaa flag fm pb in audio head switch pulse in normal out mute ctrl line l out 1500p line r out normal in mix out fsc in data clock 0.022 m 0.0047 m 0.022 m 10 m 0.0047 m 0.022 m line1 l in 4.7 k bs r in 4.7 k bs l in 4.7 k tuner r in tuner l in tuner m in line1 r in 4.7 k v cc unreg v cc line2 l in 4.7 k line2 r in 4.7 k 4.7 k 4.7 k mute: h v ee v ee 47 m 2.2m unreg v ee 19 input switch mix amp pnr enve lope hi-fi det modem alc data decoder modem fmbpf vco bpf auto adjust d.o. com. fm out sw reg line amp line amp output switch pnr fig.2 operation notes the vco oscillation frequency and frequency deviation, and the bpf center frequency are directly influenced by the temperature characteristics of the setting resistors connected to pins 16 and 17. use metal-film components.
14 video ics BH7801BK electrical characteristic curves 0.75 1.50 2.25 ?50 ?40 ?30 ?20 ?10 gain: gv (db) frequency: f ( mhz) lch 1.3mhz 1.7mhz rch fig. 3 fm bpf frequency characteristics (ntsc) 0.85 1.60 2.35 ?50 ?40 ?30 ?20 ?10 gain: gv (db) frequency: f ( mhz) lch 1.4mhz 1.8mhz rch fig. 4 fm bpf frequency characteristics (pal) external dimensions (units: mm) qfp44 0.15 33 23 22 12 1 34 44 10.0 0.2 14.0 0.3 0.35 0.1 10.0 0.2 14.0 0.3 1.2 0.05 2.15 0.1 0.15 0.1 0.8 11

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