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| d a t a sh eet preliminary speci?cation supersedes data of august 1993 file under integrated circuits, ic01 1996 jun 06 integrated circuits tea0678 dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute
1996 jun 06 2 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 features dual noise reduction (nr) channels head pre-amplifiers reverse head switching automatic music search (ams) mute position equalization with electronically switched time constants dolby reference level = 387.5 mv 32 pins switch inputs ttl compatible differential output stage has: C capability to drive 1.2 nf capacitive load C capability to drive 1 k w load C short-circuit proof C short-circuit proof to 16 v via coupling capacitor. improved emc behaviour. general description the tea0678 is a bipolar integrated circuit that provides two channels of dolby b noise reduction for playback applications in car radios. it includes head and equalization amplifiers with electronically switchable time constants. furthermore it includes electronically switchable inputs for tape drivers with reverse heads. this device also detects pauses of music in automatic music search (ams) mode, with a delay time fixed externally by a resistor. the short-circuit proof output stage of the tea0678 is differential and provides muting. the device will operate with power supplies in the range of 7.6 to 12 v, output overload level increasing with increase in supply voltage. current drain varies with supply voltage, noise reduction on/off and ams on/off so it is advisable to use a regulated power supply or a supply with a long time constant. .current drain varies with these variables: supply voltage noise reduction on/off ams on/off. because of this current drain variation it is advisable to use a regulated power supply or a supply with a long time constant. quick reference data ordering information remark dolby*: available only to licensees of dolby laboratories licensing corporation, san francisco, ca94111, usa, from whom licensing and application information must be obtained. dolby is a registered trade-mark of dolby laboratories licensing corporation. symbol parameter min. typ. max. unit v cc supply voltage 7.6 10 12 v i cc supply current - 25 28 ma signal plus noise-to-noise ratio 78 84 - db type number package name description version tea0678 sdip32 plastic shrink dual in-line package; 32 leads (400 mil) sot232-1 TEA0678T so32 plastic small outline package; 32 leads; body width 7.5 mm sot287-1 sn + n -------------- 1996 jun 06 3 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 block diagram handbook, full pagewidth 19 180 w v cc 10 m f 24 k w 18 k w 27 k w 8.2 k w 330 k w 1 k w 470 pf 470 pf 10 nf 4.7 nf 270 k w 180 k w 24 k w 4.7 m f 4.7 m f 1 m f 4.7 nf 15 nf 100 m f 330 nf 100 nf c l r l r l r t ams delay time output a + output a - v ref med769 from microprocessor low: nr on open: off high: ams on 180 w 10 m f 8.2 k w 330 k w 1 k w 470 pf 470 pf 10 nf 270 k w 180 k w 4.7 m f 10 m f 4.7 m f 1 m f 15 nf 330 nf 100 nf c l r l r l output b + output b - v ref from microprocessor low: mute on high: mute off low: input 1 high: input 2 from microprocessor eq switch from microprocessor low: 120 m s open: 70 m s ams out head switch input 15 k w 15 k w delay time level detector power supply ams eq nr mute head- switch logic dolby b nr circuit dolby b nr circuit 1 23 4 5 6 7 8 910 11 12 13 14 15 16 17 18 20 21 22 23 24 25 26 27 28 29 30 31 32 ams processor gnd v cc v ref tea0678 eq amp. eq amp. pre amp. pre amp. fig.1 block and application diagram. 1996 jun 06 4 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 pinning symbol pin description outa - 1 negative output channel a outa+ 2 positive output channel a nr/ams 3 noise reduction/music search switch inca 4 input mute/output stage channel a outca 5 output dolby b processor channel a inta 6 integrating ?lter channel a contra 7 control voltage channel a hpa 8 high-pass ?lter channel a sca 9 side chain channel a td 10 delay time constant eqa 11 equalizing output channel a eqfa 12 equalizing feedback channel a v cc 13 supply voltage ina1 14 input channel a1 (forward or reverse) v ref 15 reference voltage ina2 16 input channel a2 (reverse or forward) inb2 17 input channel b2 (reverse or forward) hs 18 head switch input inb1 19 input channel b1 (forward or reverse) gnd 20 ground eqfb 21 equalizing feedback channel b eqb 22 equalizing output channel b amseq 23 ams output and eq switch input scb 24 side chain channel b hpb 25 high-pass ?lter channel b contrb 26 control voltage channel b intb 27 integrating ?lter channel b outcb 28 output dolby b processor channel b incb 29 input mute/output stage channel b mute 30 mute switch outb+ 31 positive output channel b outb - 32 negative output channel b fig.2 pin configuration. handbook, halfpage tea0678 med770 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 outa - outa + nr/ams inca outca inta contra hpa sca td eqa eqfa v cc ina1 outb - outb + mute incb intb contrb outcb hpb scb amseq eqb eqfb gnd inb1 v ref ina2 hs inb2 1996 jun 06 5 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 functional description noise reduction (nr) is enabled when pin nr/ams is connected to ground and disabled when open-circuit (left floating from a 3-state output). dolby noise reduction only operates correctly if 0 db dolby level is adjusted at 387.5 mv. automatic music search (ams) is enabled when pin nr/ams is connected to high (5 v) and disabled when open-circuit (left floating from a 3-state output). in ams mode the signal of both channels are rectified and then added. this means, even if one channel signal appears inverted to the other channel, with the tea0678 the normal ams function is ensured (see figs 4, 5 and 6). equalization time constant switching (70 m s or 120 m s) is achieved when pin amseq is connected to gnd via an 18 k w resistor (120 m s), or left open-circuit (70 m s). this does not affect the ams output signal during ams mode (see fig.1). head switching is achieved when pin hs is connected to gnd (input in1 active) or connected to high (5 v) level (input in2 active). if left open-circuit in1 is active. mute is enabled when pin mute is connected to ground and off when connected to high (5 v) level. for smooth switching a time constant is recommended. if left open-circuit mute is active. the differential output stage of each channel is connected via a provision to the dolby and pre-amplifier part. this provision may be used for any processing of the tape signal or to add another signal. each output drives a resistive load of nominal 10 k w and is capable of driving 1k w , also a capacitive load of 1.2 nf to ground and between differential outputs. each output can be short-circuited to a battery (16 v) via a coupling capacitor (4.7 m f). limiting values in accordance with the absolute maximum rating system (iec 134); note1. notes 1. the device may not operate correctly when subjected to these ratings when the ratings exceed the electrical characteristics of the device as specified in chapter characteristics. the device will recover automatically when the environment is reduced to the requirements of the characteristics. 2. the tea0678 allows a high-level at switching pins without supply voltage (v cc = 0; stand-by mode). this means a maximum input voltage of 6.5 v for the switching input pins. 3. human body model (1.5 k w , 100 pf). 4. machine model (0 w , 200 pf). symbol parameter conditions min. max. unit v cc supply voltage 0 16 v v i input voltage (pins 1 to 32) except pin 15 (v ref ); pin 3 (nr/ams), pin 18 (hs) and pin 30 (mute) to v cc - 0.3 +v cc v input voltage at pin 3 (nr/ams), pin 18 (hs) and pin 30 (mute) note 2 - 0.3 +6.5 v t short pin 15 (v ref ) to v cc short-circuiting duration - 5s t stg storage temperature - 55 +150 c t amb operating ambient temperature - 40 +85 c v es electrostatic handling voltage for all pins note 3 - 2+2kv note 4 - 500 +500 v 1996 jun 06 6 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 characteristics v cc = 10 v; f = 20 hz to 20 khz; t amb =25 c; nominal load 10 k w ; all levels are referenced to 775 mv (rms) (0 db) at differential outputs (v o =v o+ - v o - ), this corresponds to dolby level 387.5 mv (rms) (0 db) at test point (outc); see fig.1; nr on/ams off; eq switch in the 70 m s position; unless otherwise speci?ed. symbol parameter conditions min. typ. max. unit v cc supply voltage 7.6 10 12 v i cc supply current pins 14, 16, 17 and 19 connected to v ref - 25 28 ma f = 1 khz; v o = 0 db at each output - 26 37 ma a m channel matching f = 1 khz; v o = 0 db; nr off; outa/outb - 0.5 - +0.5 db g v voltage gain (output stage) between out and outc; f = 1 khz; nr off 5.5 6 6.5 db g mm voltage gain mismatch (output stage) mismatch between out+ and out - ; f = 1 khz; nr off - 0.5 - +0.5 db thd total harmonic distortion (2nd and 3rd harmonic) f = 1 khz; v o =0db - 0.08 0.15 % f = 10 khz; v o =6db - 0.15 0.3 % h r headroom at output v cc = 9 v; thd = 1%; f = 1 khz 13 -- db signal plus noise-to-noise ratio internal gain 40 db; linear; ccir/arm weighted; decode mode; see fig.10 78 84 - db v no(rms) equivalent input noise voltage in decode mode (rms value) nr off; unweighted; f = 20 hz to 20 khz; r source =0 w -- 1.4 m v psrr power supply ripple rejection v i(rms) = 0.25 v; f = 1 khz; see fig.7 for unsymmetrical signal at outc 52 57 - db at differential out; note 1 49 52 - db f o frequency response measured in encode mode; referenced to tp see fig.10 v o = - 25 db; f = 0.2 khz - 22.9 - 24.4 - 25.9 db v o = 0 db; f=1khz - 1.5 0 +1.5 db v o = - 25 db; f=1khz - 17.8 - 19.3 - 20.8 db v o = - 25 db; f=5khz - 18.1 - 19.6 - 21.1 db v o = - 35 db; f = 10 khz - 24.4 - 25.9 - 27.4 db a cs channel separation v o = +10 db; f = 1 khz; see fig.8 61 67 - db a cc crosstalk between active and inactive input nr off; f = 1 khz; v o = +10 db; see fig.8 70 77 - db r l load resistance at each output outa+, outa - , outb+ and outb - (corresponds to 2 k w at differential output) ac-coupled f = 1 khz; v o = 12 db; thd=1% 10 -- k w thd = 1%; note 2 1 -- k w c l capacitive load at each output (between out+ and out - ) and ground c lmin at each output to ground (pins 1, 2, 31 and 32) 0.3 - 1.3 nf g v voltage gain of pre-ampli?er from pin ina1 or ina2 to pin eqfa and from pin inb1 or inb2 to pin eqfb; f = 1 khz 29 30 31 db sn + n -------------- 1996 jun 06 7 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 v i(offset)(dc) dc input offset voltage - 2 - mv i i(bias) input bias current -- 0.4 m a r eq equalization resistor 4.7 5.8 6.9 k w r i input resistance head inputs 60 100 - k w a v open-loop ampli?cation pin ina1 or ina2 to pin eqa and pin inb1 or inb2 to pin eqb f = 10 khz 80 86 - db f = 400 hz 104 110 - db v o(offset)(dc) dc offset voltage at pins out+ to out - pins ina1, ina2, inb1 and inb2 connected to v ref - 10 - +10 mv v mute(offset) mute offset voltage at pins out+ to out - pins ina1, ina2, inb1 and inb2 connected to v ref - 10 - +10 mv v ref - v outc dc output offset voltage at pins outca and outcb nr off; pins ina1, ina2, inb1 and inb2 connected to v ref - 0.15 - +0.15 v i o dc output current pins ina1, ina2, inb1 and inb2 connected to v ref pin outc to ground - 2 -- ma pin outc to v cc 0.3 -- ma pin out to ground - 2.5 -- ma pin out to v cc 2.5 -- ma r i input resistance output stage at pins inca and incb 10 16 - k w z o output impedance at each output outa+, outa - , outb+ and outb - - 90 110 w d mute mute depth at differential output nr off f = 1 khz - 80 -- db f = 10 khz - 80 -- db amsl ams threshold level at music to pause nr off;f=10 khz; see fig.9 - 25 - 22 - 19 db amsh ams threshold level at pause to music note 3 - 24 - 21 - 18 db t d ams delay time range f = 10 khz; 0 db burst; see table 1 - 23 to 160 - ms t r ams rise/delay time f = 10 khz; 0 db burst 2 - 10 ms emc dc offset voltage at pins outa - , outa+, outb+ and outb - f = 900 mhz; v i =3v (rms) ; see figs 11, 12 and13 - 100 - mv symbol parameter conditions min. typ. max. unit 1996 jun 06 8 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 switching thresholds nr/ams switch ( pin 3) v il low level input voltage nr on - 0.3 - +0.8 v i il low level input current nr on - 10 - 20 - 40 m a i i(?oat) allowed ?oating input current pin left open-circuit; nr/ams off - 10 0 +10 m a v ?oat ?oating voltage pin left open-circuit; nr/ams off - 2.4 5 v v ih high level input voltage ams on 4 - 5.5 v i ih high level input current ams on 10 20 40 m a e qualization ( pin 23) i eq70 ?oating leakage current time constant 70 m s active +0.002 -- 0.15 ma v eq70 ?oating voltage time constant 70 m s active - 4.6 5 v i eq120 input current time constant 120 m s active - 0.25 -- 1ma ams output ( pin 23) v oh high level output voltage music present 4 4.6 5 v i oh high level output current current capability +0.01 -- 1ma i oh high level output current current capability; note 4 +0.01 -- 0.15 ma v ol low level output voltage music not present -- 0.8 v i ol low level output current current capability - 0.01 - +1 ma mute switch ( pin 30) v il low level input voltage mute on - 0.3 - +0.8 v i il low level input current mute on -- 4 - 100 m a v ih high level input voltage mute off 4 - 5.5 v i ih high level input current mute off; smooth switching with a time constant is recommended - 10 100 m a h ead switch ( pin 18) v il low level input voltage input 1 on - 0.3 - +0.8 v i il low level input current input 1 on -- - 100 m a v ih high level input voltage input 2 on 4 - 5.5 v i ih high level input current input 2 on - 30 100 m a symbol parameter conditions min. typ. max. unit 1996 jun 06 9 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 notes to the characteristics 1. for the signal to be doubled (+6 db) at differential output as a function of outc, the signal-to-ripple ratio is improved at differential output for approximately 3 db. 2. by using the small load, the output voltage may be divided by - 0.8 db. 3. the high speed of the tape (ff, rew) at the tape head during ams mode causes a transformation of level and frequency of the originally recorded signal. it means a boost of signal level of approximately 10 db and more for recorded frequencies from 500 hz up to 4 khz. so the threshold level of - 22 db corresponds to signal levels in pb mode of approximately - 32 db. the ams inputs for each channel are pin sca and pin scb. as the frequency spectrum is transformed by a factor of approximately 10 to 30 due to the higher tape speed in ff, rew, the high-pass filter (4.7 nf/24 k w ) removes the effect of offset voltages but does not affect the music search function. in the application circuit (fig.1) the frequency response of the system between tape heads input, e.g. pins ina2/inb2, to the ams input pins sca and scb is constant over the whole frequency range (see fig.3). the frequency dependence of threshold level is shown in fig.3. 4. in ams off mode, pin amseq is high level, the equalization time constant will be switched by pulling approximately 200 m a out of pin amseq. this means for the device connected to pin amseq, a restriction of input current at high level less than 200 m a during ams off; otherwise the switching of the time constants is disabled but fixed at 120 m s. if the following devices, input consumes more than 200 m a, this input has to be disconnected in ams off mode. (to ensure switching the currents for the different switched modes are specified with a tolerance of 50 m a in chapter characteristics.) for an application with a fixed eq time constant of 120 m s the equalizing network may be applied completely external. change 8.2 k w resistor to 14 k w the internal resistor r eq = 5.8 k w is short-circuited by fixing the eq switch input at the 70 m s position (i eq70 ). table 1 blank delay time set by resistor r t at pin td resistor value r t (k w ) delay time t d typ. (ms) tolerance (%) 68 23 20 150 42 15 180 48 15 220 56 15 270 65 10 330 76 10 470 98 10 560 112 10 680 126 10 820 142 10 1000 160 10 1996 jun 06 10 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 general note it is recommended to switch off v cc with a gradient of 400 v/s at maximum to avoid plops on tape in the event of contact between tape and tape head while switching off. fig.3 ams threshold level. (1) ams threshold level for application circuit (fig.1). (2) ams threshold level for test circuit (fig.9). handbook, full pagewidth - 60 - 20 med623 10 2 10 3 10 4 10 5 - 40 - 50 - 30 (db) (hz) (1) (2) general note on ams the speed of tape at the tape head during ff, rew depends on the diameter of the tape on the spindle. depending on this speed, the recorded signal occurs transformed in frequency and magnitude as a function of the original signal in playback mode speed. for example: a recorded pause of 3 s passes the tape head at its highest speed in 111 ms, e.g. during ff mode near tape end. this time constant of 111 ms corresponds to a pause of 1.3 s at the beginning of the tape in playback mode. thus a pause t is uniquely defined outside the interval 1.3 s < t < 3 s. inside this interval t will be recognized as a pause or not dependent on the local point of tape, respectively the speed of tape. times of pauses described investigated for this document are valid for tape devices with a speed of its spindle (ff, rew): respectively 12 to 27 times of the playback speed. w r 51 1 s -- - = 1996 jun 06 11 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 short description music search a system for music search mainly consists of a level and a time detection (see fig.4). for adapting and decoupling the input signal will be amplified (a), then rectified (b) and smoothed with a time constant (c). so the voltage at (c) corresponds to the signal level and will be compared to the predefined pause level at the first comparator (d), the level detector. if the signal level becomes smaller than the pause level, the level detector(d) changes its output signal. due to the output level of the level detector the capacitor of the second time constant (e) will be charged, respectively discharged. if the pause level of the input signal remains for a certain time, the voltage at the capacitor reaches a certain value, which corresponds to an equivalent time value due to the charging. the voltage at the capacitor will be compared to a predefined time-equivalent voltage by the second comparator (f), the time detector. if the pause level of the input signal remains for this predefined time, the time detector (f) changes its output level for pause found status. in this ic the signals of both channels are first rectified and then added. the signal behind the adder is described by v add = ? v chana ? + ? v chanb ? , where: ? v chana ? : absolute value channel a ? v chanb ? : absolute value channel b this means, even if one channel signal appears phase shifted to the other channel (at worst cases inverted), the tea0678 will ensure the normal ams function. fig.4 integrated music search function. handbook, full pagewidth med772 comparator 1 comparator 2 t 1 t 2 ina inb amplifier rectifier (a) (b) (c) (d) (e) (f) out v t v i level detector time detector 1996 jun 06 12 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 description of the principle timing diagram for ams-scan mode without initial input signal (see fig.5) fig.5 ams-scan mode without initial input signal. handbook, full pagewidth med773 output signal to microprocessor 4.5 v v amseq time threshold upper threshold (hysteresis) v t v ref level threshold v l v in t r : rise time t d : delay time t b : burst time t p : pause time t f : fall time v l : voltage at level detector input pin 7 (contra) v t : voltage at time detector input pin 26 (contrb) t t t t ams on t r t d t f t b < t r t p < t d t 0 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 12 t 13 t 14 t 15 by activating ams-scan mode, the ams output level directly indicates whether the input level corresponds to a pause level (v amseq = low) or not (v amseq = high). at t 0 the ams-scan mode is activated. without a signal at v in , the following initial procedure runs until the ams output changes to low level: due to no signal at v in the voltage at the level detector input v i (pin 7, contra) remains below the level threshold and the second time constant will be discharged (time detector input v t ). when v t passes the time threshold level, the time detector output changes to low level. now the initial procedure is completed. if a signal burst appears at t 3 , the level detector input voltage rises immediately and causes its output to charge the second time constant, which supplies the input voltage v t for the time detector. when v t passes the upper threshold level after the rise time t r (at t 4 ), the ams output changes to high. if the signal burst ends at t 5 the level detector input v i falls to its low level. when passing the level threshold at t 6 , the discharging of the second time constant begins. now the circuit measures the delay time t d , which is externally fixed by a resistor and defines the length of a pause to be detected. if no signal appears at v in within the time interval t d , the time detector output switches the ams output to low level at t 7 . if a plop noise pulse appears at v in (t 8 ) with a pulse width less than the rise time t r >t b , the plop noise will not be detected as music. the ams output remains low. similarly the system handles no music pulses t p : when music appears at t 11 with a small interruption at t 13 , this interruption will not affect the ams output for t p 1996 jun 06 14 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 test and application information h andbook, full pagewidth 10 k w 1000 m f 100 nf 270 k w 180 k w 10 k w 20 k w 24 k w 18 k w 20 k w 10 k w 24 k w 270 k w 180 k w 27 k w 4.7 m f 4.7 m f 1 m f 10 m f 10 m f 10 m f 1 m f 4.7 m f 4.7 m f 4.7 nf 15 nf 15 nf 4.7 nf 100 m f 100 nf 330 nf 100 nf 330 nf c l r l r l c l r l r l output b - output b + from microprocessor high: mute off v ref ams out eq 70 m s from microprocessor low: input 1 high: input 2 r t ams delay time output a + output a - on nr low: nr on v ref v cc = 10 v 0.25 v rms 1 khz 15 k w 15 k w delay time level detector power supply ams eq nr mute head- switch logic dolby b nr circuit dolby b nr circuit 1 23 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ams processor gnd v cc v ref tea0678 eq amp. eq amp. pre amp. pre amp. med775 fig.7 test circuit for power supply ripple rejection. 1996 jun 06 15 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 a ndbook, full pagewidth 19 200 w 470 pf 10 m f 100 nf 270 k w 180 k w 10 k w 20 k w 24 k w 4.7 m f 4.7 m f 1 m f 10 m f 4.7 nf 15 nf 100 m f 330 nf 100 nf c l r l r l r t ams delay time output a + output a - on nr low: nr on v ref v cc = 10 v med776 10 v 18 k w 20 k w 10 k w 24 k w 270 k w 180 k w 27 k w 10 m f 10 m f 1 m f 4.7 m f 4.7 m f 15 nf 4.7 nf 100 nf 330 nf c l r l r l output b - output b + from microprocessor high: mute off v ref ams out eq 70 m s from microprocessor low: input 1 high: input 2 15 k w 15 k w delay time level detector power supply ams eq nr head- switch mute logic dolby b nr circuit dolby b nr circuit 1 23 4 5 6 7 8 910 11 12 13 14 15 16 17 18 20 21 22 23 24 25 26 27 28 29 30 31 32 ams processor gnd v cc v ref tea0678 eq amp. eq amp. pre amp. pre amp. fig.8 test circuit for channel separation. 1996 jun 06 16 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 handbook, full pagewidth 19 100 nf 270 k w 180 k w 10 k w 20 k w 24 k w 4.7 m f 4.7 m f 1 m f 10 m f 4.7 nf 15 nf 100 m f 330 nf 100 nf c l r l r l r t ams delay time output a + output a - v ref v cc = 10 v 5 v high: ams on 18 k w 20 k w 10 k w 24 k w 270 k w 180 k w 27 k w 10 m f 10 m f 1 m f 4.7 m f 4.7 m f 15 nf 4.7 nf 100 nf 330 nf c l r l r l output b - output b + from microprocessor high: mute off v ref ams out eq 70 m s from microprocessor low: input 1 high: input 2 15 k w 15 k w delay time level detector power supply ams eq nr head- switch mute logic dolby b nr circuit dolby b nr circuit 1 23 4 5 6 7 8 910 11 12 13 14 med777 15 16 17 voltage input 18 20 21 22 23 24 25 26 27 28 29 30 31 32 ams processor gnd v cc v ref tea0678 eq amp. eq amp. pre amp. pre amp. fig.9 test circuit for ams threshold level. 1996 jun 06 17 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 handbook, full pagewidth med778 15 k w 15 k w 270 k w 180 k w 10 k w 20 k w 24 k w 18 k w 20 k w 10 k w 25 k w 25 k w 24 k w 270 k w 180 k w 27 k w 4.7 m f 4.7 m f 1 m f 10 m f 10 m f 10 m f 10 m f 1 m f 4.7 m f 4.7 m f 4.7 nf 15 nf 15 nf 200 w 100 m f 10 m f 100 nf 330 nf 100 nf 100 nf 470 pf 4.7 nf 330 nf delay time level detector power supply ams eq nr head- switch mute head logic dolby b nr circuit dolby b nr circuit 1 23 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 c l r l r l c l r l r l output b - output b + from microprocessor high: mute off v ref tp ams out eq 70 m s v cc v i from microprocessor low: input 1 high: input 2 r t ams delay time output a + output a - on nr low: nr on v ref v cc = 10 v 10 v v i ams processor gnd v cc v ref tea0678 eq amp. eq amp. pre amp. pre amp. tp fig.10 test circuit for frequency response (channel b, encode mode). 1996 jun 06 18 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 a ndbook, full pagewidth 19 100 nf 270 k w 180 k w 10 k w 20 k w 68 k w 24 k w 4.7 m f 4.7 m f 4.7 nf 15 nf 100 m f 330 nf 100 nf 10 w 40 w ams delay time v cc = 10 v mbh478 20 k w 10 k w 24 k w 270 k w 180 k w 27 k w 5 k w v cc 5 k w 10 m f 15 nf 4.7 nf 100 nf 330 nf v ref 200 w 470 pf 200 w 470 pf 200 w 470 pf 15 k w 15 k w delay time level detector 4.7 m f 4.7 m f power supply 200 w 470 pf ams eq nr head- switch mute logic dolby b nr circuit dolby b nr circuit 1 23 4 5 6 7 8 910 11 12 13 14 15 16 17 18 20 21 22 23 24 25 26 27 28 29 30 31 32 ams processor gnd v cc v ref tea0678 eq amp. eq amp. pre amp. pre amp. fig.11 emc test circuit. 1996 jun 06 19 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 layout of printed-circuit board for emc test circuit (for TEA0678T) fig.12 top side with components. dimensions in mm. l pagewidth mbh462 68 72 40 w 470 pf 10 w 200 w 0 w 0 w 0 w 0 w 470 pf 200 w 270 k w 270 k w 27 k w 5 k w 5 k w 20 k w 20 k w 10 k w 470 pf 200 w 470 pf 200 w 10 k w 68 k w 15 nf 15 nf 4.7 nf 4.7 nf 100 nf 100 nf 100 nf TEA0678T 1996 jun 06 20 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 fig.13 bottom side with components. l pagewidth mbh461 72 68 x5 x4 x3 mp mp mp mp mp mp mp 4.7 m f 100 m f 100 m f 4.7 m f 4.7 m f 180 k w 180 k w 24 k w 24 k w 4.7 m f x2 x1 s1 x5 330 nf 330 nf dimensions in mm. 1996 jun 06 21 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 package outlines unit b 1 cee m h l references outline version european projection issue date iec jedec eiaj mm dimensions (mm are the original dimensions) sot232-1 92-11-17 95-02-04 b max. w m e e 1 1.3 0.8 0.53 0.40 0.32 0.23 29.4 28.5 9.1 8.7 3.2 2.8 0.18 1.778 10.16 10.7 10.2 12.2 10.5 1.6 4.7 0.51 3.8 m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 32 1 17 16 b e pin 1 index 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. (1) (1) d (1) z a max. 12 a min. a max. sdip32: plastic shrink dual in-line package; 32 leads (400 mil) sot232-1 1996 jun 06 22 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 unit a max. a 1 a 2 a 3 b p cd (1) e (1) eh e ll p qz y w v q references outline version european projection issue date iec jedec eiaj mm inches 2.65 0.10 0.25 0.01 1.4 0.055 0.3 0.1 2.45 2.25 0.49 0.36 0.27 0.18 20.7 20.3 7.6 7.4 1.27 10.65 10.00 1.2 1.0 0.95 0.55 8 0 o o 0.25 0.1 0.004 0.25 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 1.1 0.4 sot287-1 92-11-17 95-01-25 (1) 0.012 0.004 0.096 0.086 0.02 0.01 0.050 0.047 0.039 0.42 0.39 0.30 0.29 0.81 0.80 0.011 0.007 0.037 0.022 0.01 0.01 0.043 0.016 w m b p d h e z e c v m a x a y 32 17 16 1 q a a 1 a 2 l p q detail x l (a ) 3 e pin 1 index 0 5 10 mm scale so32: plastic small outline package; 32 leads; body width 7.5 mm sot287-1 1996 jun 06 23 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 soldering introduction there is no soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. however, wave soldering is not always suitable for surface mounted ics, or for printed-circuits with high population densities. in these situations reflow soldering is often used. this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our ic package databook (order code 9398 652 90011). sdip s oldering by dipping or by wave the maximum permissible temperature of the solder is 260 c; solder at this temperature must not be in contact with the joint for more than 5 seconds. the total contact time of successive solder waves must not exceed 5 seconds. the device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (t stg max ). if the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. r epairing soldered joints apply a low voltage soldering iron (less than 24 v) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. if the temperature of the soldering iron bit is less than 300 c it may remain in contact for up to 10 seconds. if the bit temperature is between 300 and 400 c, contact may be up to 5 seconds. so r eflow soldering reflow soldering techniques are suitable for all so packages. reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. several techniques exist for reflowing; for example, thermal conduction by heated belt. dwell times vary between 50 and 300 seconds depending on heating method. typical reflow temperatures range from 215 to 250 c. preheating is necessary to dry the paste and evaporate the binding agent. preheating duration: 45 minutes at 45 c. w ave soldering wave soldering techniques can be used for all so packages if the following conditions are observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow. the package footprint must incorporate solder thieves at the downstream end. during placement and before soldering, the package must be fixed with a droplet of adhesive. the adhesive can be applied by screen printing, pin transfer or syringe dispensing. the package can be soldered after the adhesive is cured. maximum permissible solder temperature is 260 c, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 c within 6 seconds. typical dwell time is 4 seconds at 250 c. a mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. r epairing soldered joints fix the component by first soldering two diagonally- opposite end leads. use only a low voltage soldering iron (less than 24 v) applied to the flat part of the lead. contact time must be limited to 10 seconds at up to 300 c. when using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 c. 1996 jun 06 24 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute tea0678 definitions life support applications these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips for any damages resulting from such improper use or sale. data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. limiting values limiting values given are in accordance with the absolute maximum rating system (iec 134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the speci?cation is not implied. exposure to limiting values for extended periods may affect device reliability. application information where application information is given, it is advisory and does not form part of the speci?cation. 1996 jun 06 25 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential tea0678 notes 1996 jun 06 26 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential tea0678 notes 1996 jun 06 27 philips semiconductors preliminary speci?cation dual dolby* b-type noise reduction circuit, automatic music search, with differential tea0678 notes internet: http://www.semiconductors.philips.com/ps/ (1) address content source july 29, 1996 philips semiconductors C a worldwide company ? philips electronics n.v. 1996 sca49 all rights are reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. netherlands: postbus 90050, 5600 pb eindhoven, bldg. vb, tel. +31 40 27 83749, fax. +31 40 27 88399 new zealand: 2 wagener place, c.p.o. box 1041, auckland, tel. +64 9 849 4160, fax. +64 9 849 7811 norway: box 1, manglerud 0612, oslo, tel. +47 22 74 8000, fax. +47 22 74 8341 philippines: philips semiconductors philippines inc., 106 valero st. salcedo village, p.o. box 2108 mcc, makati, metro manila, tel. +63 2 816 6380, fax. +63 2 817 3474 poland: ul. lukiska 10, pl 04-123 warszawa, tel. +48 22 612 2831, fax. +48 22 612 2327 portugal: see spain romania: see italy russia: philips russia, ul. usatcheva 35a, 119048 moscow, tel. +7 095 926 5361, fax. +7 095 564 8323 singapore: lorong 1, toa payoh, singapore 1231, tel. +65 350 2538, fax. +65 251 6500 slovakia: see austria slovenia: see italy south africa: s.a. philips pty ltd., 195-215 main road martindale, 2092 johannesburg, p.o. box 7430 johannesburg 2000, tel. +27 11 470 5911, fax. +27 11 470 5494 south america: rua do rocio 220 - 5th floor, suite 51, cep: 04552-903-s?o paulo-sp, brazil, p.o. box 7383 (01064-970), tel. +55 11 821 2333, fax. +55 11 829 1849 spain: balmes 22, 08007 barcelona, tel. +34 3 301 6312, fax. +34 3 301 4107 sweden: kottbygatan 7, akalla, s-16485 stockholm, tel. +46 8 632 2000, fax. +46 8 632 2745 switzerland: allmendstrasse 140, ch-8027 zrich, tel. +41 1 488 2686, fax. +41 1 481 7730 taiwan: philips taiwan ltd., 23-30f, 66, chung hsiao west road, sec. 1, p.o. box 22978, taipei 100, tel. +886 2 382 4443, fax. +886 2 382 4444 thailand: philips electronics (thailand) ltd., 209/2 sanpavuth-bangna road prakanong, bangkok 10260, tel. +66 2 745 4090, fax. +66 2 398 0793 turkey: talatpasa cad. no. 5, 80640 gltepe/istanbul, tel. +90 212 279 2770, fax. +90 212 282 6707 ukraine: philips ukraine, 2a akademika koroleva str., office 165, 252148 kiev, tel. +380 44 476 0297/1642, fax. +380 44 476 6991 united kingdom: philips semiconductors ltd., 276 bath road, hayes, middlesex ub3 5bx, tel. +44 181 730 5000, fax. +44 181 754 8421 united states: 811 east arques avenue, sunnyvale, ca 94088-3409, tel. +1 800 234 7381, fax. +1 708 296 8556 uruguay: see south america vietnam: see singapore yugoslavia: philips, trg n. pasica 5/v, 11000 beograd, tel. +381 11 825 344, fax.+381 11 635 777 for all other countries apply to: philips semiconductors, marketing & sales communications, building be-p, p.o. box 218, 5600 md eindhoven, the netherlands, fax. +31 40 27 24825 argentina: see south america australia: 34 waterloo road, north ryde, nsw 2113, tel. +61 2 805 4455, fax. +61 2 805 4466 austria: computerstr. 6, a-1101 wien, p.o. box 213, tel. +43 1 60 101, fax. +43 1 60 101 1210 belarus: hotel minsk business center, bld. 3, r. 1211, volodarski str. 6, 220050 minsk, tel. +375 172 200 733, fax. +375 172 200 773 belgium: see the netherlands brazil: see south america bulgaria: philips bulgaria ltd., energoproject, 15th floor, 51 james bourchier blvd., 1407 sofia, tel. +359 2 689 211, fax. +359 2 689 102 canada: philips semiconductors/components, tel. +1 800 234 7381, fax. +1 708 296 8556 china/hong kong: 501 hong kong industrial technology centre, 72 tat chee avenue, kowloon tong, hong kong, tel. +852 2319 7888, fax. +852 2319 7700 colombia: see south america czech republic: see austria denmark: prags boulevard 80, pb 1919, dk-2300 copenhagen s, tel. +45 32 88 2636, fax. +45 31 57 1949 finland: sinikalliontie 3, fin-02630 espoo, tel. +358 615 800, fax. +358 615 80920 france: 4 rue du port-aux-vins, bp317, 92156 suresnes cedex, tel. +33 1 40 99 6161, fax. +33 1 40 99 6427 germany: hammerbrookstra?e 69, d-20097 hamburg, tel. +49 40 23 52 60, fax. +49 40 23 536 300 greece: no. 15, 25th march street, gr 17778 tavros, tel. +30 1 4894 339/911, fax. +30 1 4814 240 hungary: see austria india: philips india ltd, shivsagar estate, a block, dr. annie besant rd. worli, mumbai 400 018, tel. +91 22 4938 541, fax. +91 22 4938 722 indonesia: see singapore ireland: newstead, clonskeagh, dublin 14, tel. +353 1 7640 000, fax. +353 1 7640 200 israel: rapac electronics, 7 kehilat saloniki st, tel aviv 61180, tel. +972 3 645 0444, fax. +972 3 648 1007 italy: philips semiconductors, piazza iv novembre 3, 20124 milano, tel. +39 2 6752 2531, fax. +39 2 6752 2557 japan: philips bldg 13-37, kohnan 2-chome, minato-ku, tokyo 108, tel. +81 3 3740 5130, fax. +81 3 3740 5077 korea: philips house, 260-199 itaewon-dong, yongsan-ku, seoul, tel. +82 2 709 1412, fax. +82 2 709 1415 malaysia: no. 76 jalan universiti, 46200 petaling jaya, selangor, tel. +60 3 750 5214, fax. +60 3 757 4880 mexico: 5900 gateway east, suite 200, el paso, texas 79905, tel. +1 800 234 7381, fax. +1 708 296 8556 middle east: see italy printed in the netherlands 517021/1200/02/pp28 date of release: 1996 jun 06 document order number: 9397 750 00896 |
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