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TA7324P
TOSHIBA
N/a
666
avai
Audio Linear
TA7324P
TOS
N/a
1500
avai
Audio Linear
TA7324P ,Audio Linear77,...“71‘,” - VVVVV
'ul'r7iilri7 nnmna? a r
MUTING IC
Unit ln mm
TA7324P is developed .. TA7324P ,Audio LinearBLOCK DIAGRAM
POWER SUPPLY TERMINAL MUTING AT POWER ON
"Tel, a TRIGGER MUTING
AMPLIFIER
INP .. TA7325P ,DUAL PRE AMPLIFIER909723?lfiiéerIflB—AN' A - '..jj'i"
DUAL PRE AMPLI F I ER
. Dual Pre Amplifier for Car or Home .. TA7326F ,CR TIMERTOSHIBA TA7326P/F, 27PTA7276P TA7276F TA7277P"""-"-' """-"-' qWWMtt-m-Mq TA7326P ,CR TIMERTOSHIBA TA7326P/F, 27PTA7276P TA7276F TA7277P"""-"-' """-"-' qWWMtt-m-Mq TA7327P ,CR TIMERTOSHIBA TA7326P/F, 27PTA7276P TA7276F TA7277P"""-"-' """-"-' qWWMtt-m-Mq TC51832F-12 ,120ns; V(in/out/dd): -1 to +7V; 600mW; 50mA; 32,768 word x 8-bit CMOS pseudo static RAMFEATURES
. Organization: 256K bit(32,768 word x 8 bit)
. Fast Access Time and Low Power Dissipa .. TC51832FL-10 ,100ns; V(in/out/dd): -1 to +7V; 600mW; 50mA; 32,768 word x 8-bit CMOS pseudo static RAML---.
082
_,__,J
TOSHIBA tL0GTC/hEh0RY) LIBE D " “1037343 00220]: l] -T
32,768 WORD x 8 B .. TC51832FL-12 ,120ns; V(in/out/dd): -1 to +7V; 600mW; 50mA; 32,768 word x 8-bit CMOS pseudo static RAMABSOLUTE MAXIMUM RATINGS
VOUT Output Voltage
Power Supply Voltag;
TOPR Operating Temperature
.. TC51832PL-10 ,100ns; V(in/out/dd): -1 to +7V; 600mW; 50mA; 32,768 word x 8-bit CMOS pseudo static RAML---.
082
_,__,J
TOSHIBA tL0GTC/hEh0RY) LIBE D " “1037343 00220]: l] -T
32,768 WORD x 8 B .. TC51832PL-10 ,100ns; V(in/out/dd): -1 to +7V; 600mW; 50mA; 32,768 word x 8-bit CMOS pseudo static RAMFEATURES
. Organization: 256K bit(32,768 word x 8 bit)
. Fast Access Time and Low Power Dissipa .. TC51832PL-12 ,120ns; V(in/out/dd): -1 to +7V; 600mW; 50mA; 32,768 word x 8-bit CMOS pseudo static RAML---.
082
_,__,J
TOSHIBA tL0GTC/hEh0RY) LIBE D " “1037343 00220]: l] -T
32,768 WORD x 8 B ..
TA7324P Audio Linear TOSHIBA, ELECTRONIC DE DEI] “IDENEH? DDL7EI'T? ll T - . an: 9097247 TOSHIBA. ELECTRONIC ' - _ '_'ji2',_i,i" _'iliii'i,i,,lr-r-"a,i.?,a.-,,s,/ a ITC.. _r-.i' _m" _-r-.-""'', 'At C. ' #47-21‘ .3 :i'AV7-324P . a .EM’. MUTING IC T Unit in mm TA7324P_is developed for muting the popping sound made at power of one-off receivers, pre- 230MAX 01.0 amplifiers, main amplifiers, and other electric audio equipment as well as the noise made at changeover of switches. . To mute the popping noise made in the case of l - receiving frequency or changeover of signal source of tuners. _ ".il.idli-x'tii' Delay muting at power ON. 15 £54t025 1.21025 025i015 azmx _ 2.5 MIN . Instant muting at power OFF. . Only a single timing capacitor and a very few ' il external parts are provided. F---------')--,'], . Either positive or negative pulse ls applicable 1 9 ' to the input: trigger. The terminals consist of Lead pitch is atu and tolerance is the high sensitive input terminal (sensitive £0.25 against theoretical center of level of _120mV) and the low sensitive input t9tstttt 133d that itt 0131731an an the terminal (sensitive level of th)0mV) Btytgttg of No.1 Itttsd. JEDEO - . The ty eratin over an 1 current is 5mh Min. p g p pp y ( y TOSHIBA eaa-P available for portable s'ets. BLOCK DIAGRAM POWER SUPPLY TERMINAL DELAY MUTING AT POWER ON "ey- 6 TRIGGER Tnmom no H AMPLIFIER - MUN INPUT (A) OUTPUT DISCHARGE A g mrrma DETECTOR g g (SIGNAL) , g GROUND TRIGGER TRIGGER manna AMPLIFIER ' OUTPUT INPUT (B) INSTANT MUTING AT POWER OFF GROUND (lii t AC 100" (SUBPOTENTIAL) 'rl',,''..':".',' Tt3S'HiBA:r..rcr.araraarr . y,TFr --4'd't'l'cT,7riltll ra',''-', Ali'.' ”:EEEEEE,=: . l TOSHIBA, ELECTRONIC " .DE ntp:r?i?W? 001.70% . _ I-ro-i-rt,)):-,',,-.,',',,-,-.-,] 1,ji,iii,ill),s,.,/).dll,) ELECTRONIC "g Lu-cat -i" --"-----F 'tip-sr- --ryii7-rrr7"Ti.?7,?s-r-------sh, --- T- 77- 21 MAX IMUM RATINGS (Ta=25°C) CHARACTERISTIC SYMBOL RATING UNIT Supply Voltage (V2-5)oot:e1 V2-5 3.4 V Supply Current (12) (Note2 12 20 mA Power Dissipation (Note 3) PD 500 mN Operating Temperature Tom: -20 A, 75 "c Storage Temperature Tstg ~55 'i, 150 "c Note 1. In tease of constant voltage source. Note 2. In case of constant current source. Note 3. Derated above Ta=25°C in the proportion of 4mW/°C The input voltage at the trigger terminal is GND-VBE(30.7V)When trigger terminals A and B are applied, must be set the operating supply current value from 5mh,to 15mA. ELECTRICAL CHARACTERISTICS ATa=25''c, vccemv. RB=1.51<9) CHARACTERISTEC SYMBOL £13; TEST CONDITION MIN. TYP. MAX. UNIT Supply Terminal Voltage Ir2-.5 1 Note 4 ICC=2.OmA(CONST) 3.4 3.6 3.8 V Trigger Sensitivity(A) VI :kTRIGA 1 Note 6 20.5 i0.7 t0.9 V Trigger Sencitivity(B) V3 ATRICB 1 Note 7 AO.09 i042 10.15 V Trigger Sensitivity(A) 11 (I TRIG~A 1 Note 6 - I20 A60 uA Trigger Sensitivity(B) I3 HI TRIC-B 1 Note 7 - h10 A30 uA gggggtgngv4 ggensit3Vit:y at V4 OFF 1 Note 8 - 0.75 1.0 ll gglgecting current at power I1, OFF 1 Note 8 - 6 - uA 2733;111:7773? Il,",;"''" WW1 - Note 9 . - m 40 mV Max. Sink Current I7, ly Imax 1.4 1.6 - mA Terminal Voltage (Pin 1) Ill - 1.5 - V Terminal Voltage (Pin 2) IQ 1 Note 5 3.2 3.5 3.6 V Terminal Voltage (Pin 3) V3 . 1.4 - ll Terminal Voltage (Pin 6) Muting OFF 2.6 2.7 2.8 V Muting Attenuation ATT 45 50 dB Muting Time at Power 0N ILT. 2 Note 10 T l.8 - sec gx:w:m=wmx:mzzmm d: cilrraTaT.T.= :_ AUDIO LINEAR ICreltrrc & i; m J IEEE E W. TOSHIBA, ELECTRONIC na DEI] “IUCNELI? nmmaq 1, fl 9933353., 7.953319? ELECTRONIC: "i.'"s/s"-S- _-_' _ 02E 17099::0: T-77-21 TEST CIRCUIT l. 1 85 o-----------' Icc=10mA 32 OFF Lam ON 0 VCG=18V TA'7324P 8 'g 150kt2 1.st k ' -irsxy--o voc=1av d 6630 “7:32” @11 €79 (f) li)--'']'', f =1 kHz 4.71:9 SOOmVrme Note k) Supply terminal Voltage (V2-5) Sl+'D, s + ON, s 2 f' 1 (SW positions) Read the voltage of pin 2 at Icc=20mA. Note 5) Terminal voltage (V1, V ll 2' v3, 6) SI-r D, Sir ON, si' ll (SW positions) - q....".'."''...--.-.--..-.".-""...'.-- w a.» ...-- TOS H I B A .".aerra.r.Ht-har%.r-..M..rr-i-r..qrlr_r.0.....e' "t0rrt -25f- l 'a-z1i5P'"'"'ct t -- Ira TOSHIBA1 ELECTRONIC " DE[]0007207 0017100 0 I] .' :17”, rr-.----:-.,--:"--'"'''. _rppcTe/-'w--. - ‘rrav- '_-"cr' . _ ”:19? 5., -C' --9caaa. .I“:_.;,: 097247 11?f1rtrl8l.v. ELEQTBQNICM “" 'tti' f1? fllfilrr] D T-77-21 Read each terminal voltage at the above MI position. Note 6) Trigger sensitivity (A), Trigger current (A)<&TRIGLA, iKI-TRIG-A)> 1 2" ON, si' ll (SH position) Turn VOL gradually to increase the Indication of VM from ov. In this case. pin 9 and pin 7 of the muting output terminal are at L level (about 0V when output transistor Is 0N.). As the value of Iltf is increased, pin 9 and pin 7 are turned from "L" level to "H" level at a certain point (abput 3.5mA when put- put transistor is OFF. In this case,if the value of VM is VML(A) the negative trigger sensitivity (A) ls given by the following equation: Negative trigger sensitivity (A), -rR1c-A'''v1-hm(A) If, after obtaining of the negative trigger sensitivity, the value of VM ls further increased, pin 9 and pin 7 are re-turned from "H" level to "L" level. In this case, if the indicating value of VM is ), the positive trigger aentivitity (A) is given as follows: +TRIG -A-VMH (A)- V1 To measure the trigger current f(I-TRIG-A), read the current of pin 1 at the measuring time of the VML(A)and V described NE (A) above. Note 7) Trigger sensitivity (B), trigger current (B) ktTRIG-B, :l-TR1c-B)> SI-'?, S2 3 + ON, S + ll Cm position) Measuring method is the same as mentioned in Note 5. Negative trigger sensitivity, -TRIG-Buv3-vtiL(B) Positive trigger aenéitivity, -TRrc-B--'vtm(B)-V3 r41'le 5: _ Aumo LJFUEEIKFQ ICrcra"a't (-.'-ce--te'..."-rr1-------, aatw: I I Cl l oEraasa m a Imus sin tu ' TOSHIBA1 ELECTRONIC DE "P anwaw 130171112111 13 T _ m_xuxL: -C a _ - u s,lsljrs'a,sl1ir.':,s.,;,:s,r'" TOSHIBA ELECTRONIC err" C, r4,ri',.i,,t,'. 17101 D” T-77-21 “ TA7324P Note 8) Detection sensitivity and current at power 0FF_(V4OFF, I40FF) Note 9) Note 10) st' C, sp OFF, si' If (SW position) Turn VOL gradually to Increase the indicating value of VM from 0V. When pin 9 and pin 7 of the muting,output are turned from "L" level to "B" level, the value of VN comes to V4. In this case, the current of pin 4 ls I4 OFF. Saturation voltage and maximum sink current at muting ON (VCE(sat)’ ICmax) SI" A or B, sir ON, si' ll (SW position) Measure the voltage and current of pin 9 and pin 7 when Indicating value of VM is set to ov. (Set Rg=0 at measuring the current.) Muting attenuation and muting time at power ON (ATT, MT) In the measuring circuit 2, the time from the instant when S1 is otrfwhile s, cult, co the moment when pin 9 and pin 7 are turned from "L" remains OFF) and VCC ls applied to the air- level to "R" level is taken as the muting time MT. Measure the AC voltage at pin 9 or pin 7 with S1 remains ON. In addition, turn se ON, and measure the AC voltage at pin 9 or pin 7. _ Muting attenuation ATT=20 log AC voltage er pin 7 (9) at S2 OFF AC voltage at pin 7 (9) at 32 ON mTDSHIBA :5: m " a l a I TOSHIBA, ELECTRONIC " DED H0372”? DUL?lDE 6 fl r 909%é47'_ 'ipii'i'f'ii't/ "'ifLidfiii'jr/t'ic:-?'-"- CLv_r_.uru72..,s '/--ai-i--irres--- -, fl q rm-M-W: = V _-P T-77-21 TA7324P _,ii/f7 CHARGE AND DISCHARGE s-Ziff-iii)- i? (i) f? LEVEL DETECTION A built-in trigger amplifier is Included in TA7324P for responding either to positive or negative pulse. In the trigger amplifier, two amplifiers are mounted in parallel; one is responding at a small level, while the other ls AGJOOV responding at a large level. Both amplifiers Fig.1 charge and Discharge Level _ Equivalent circuit level detector circuit as shown Fig. 1 respectively. are coupled to the discharge The discharge level detector circuit forms a flip-flop discharge cir- cuit. The circuit ls designed so that the trigger pulse width to discharge circuit may be maintained beyond constant width to discharge fully the charge of CT (Capacitor for muting and charging operation) even when the smaller width pulse is given to the trigger amplifier. Charge operation and muting operation are described as follows: 1. OPERATION AT POWER (vcc) on (REFER TO FIG.2) As soon as the power supply (Vcc) is ON, C starts to be charged through RT and the potential V on pin 6 rises gradually, in this case, l, remains conductive till the base potential of Q7 becomes equal to or more than the base potential ( 3 VBEEZ.1V) of Q8 and the muting operation is carried on by putting the muting output TR Q10 and to ON position. -rre-'.t._.N. i_mn.i 1: r-tTer. AUEMO LJFUEEI\F2 Ic:=:= -259-- i 3 4E G' =ittittue" TOSHIBA, ELECTRONIC DE tll, anwau? nummua u T 097247 TOSHIBA. ELECTRONIC " . " . ac- _,li,jiij,i,_ :),lr-,1,syr:' . .-;_¢‘;~-_v. -:~-a_‘ _ -yr,' ""'"iiiifiiifiii'i" T-77-21 m .tt2r.rllr. --.-6.-,, 2......“ e-aM.."..'.'"-.-."- ..._-qrtlr.-....V' -rFl-.q.qr..6.t mm... - DC Voltage (V) When the base potential of Q7 rises higher than that of Q3, the Q3, Q10 and Qll are OFF to release the muting operation. CT charge stops at such a level as the base potential of Q7 is VBE (50.7V) higher than that of t28. Point at; which bath bases or Re and w, become . . one and the same voltages ' tll . For discharge stop Char ing curve of Ili.., Q2 t For Q1 drive ------h--r------ V2=5VBE Q3 and Q5 t For discharge / Hating operating sec-rut] time at power ON - - - 0, Bass V'rH " ,' Ir 0.9 T potential Q4 t For muting operation at l BE _ a m power OFF w"' l potential Q5 and Q6 , Discharge level I I ESVBE detecting differenctial Q7 and Q8 t For charge level , detection and muting out- L---,, supply (Vcc) ON 1 2 s ' t5 - t(sec) put stage drive Q9 t For charge level limit Trig. a Operating “Fenian " Q10 and Q11 , Output TR for muting Each Part at Power ON 2. MUTING OPERATION BY TRIGGER A OR B (REFER TO FIG.3) When a pulse from the trigger amplifier comes in Q3 bask, Q3 is OH to discharge the charge from CT through R1(=1009) . When the dis- charge level of CT(Q7 base potential) drops lower than the base potential of I, (3VBE=2.1V), the ls. ho. and Q11 are turned ON to start the muting operation in which R1 is designed for accelerating the speed to start muting operation. When more discharge ls carried on from CT’ It I, base potential drops lower than I, base potential (2VB E''l. 4V), the Ir, Q2, and Q1 are turned ON to stop discharging by '2,Ldi, Q3 base. (Q1 acts also as a flip-flop operating reverse potential.) _ When discharging stops, charging to CT starts through RT" When the base potential of I, rises higher than that of ls, the Is, ‘Q2, and ill are turned OFF. -260-: E 1i: . = TT'.tl 3.3T :3 a2: TOSHIBA, ELECTRONIC DE DE” 303724? 00171011 I [r T (iiiji.j,il,i)ii-ii,l',rC,,," TOSHIBA ELECTRONICI’M-i _',),,'),-,",,'),)),,')).....',!,:':',:," 17104 tr T -"'""u"ei'i"iuiic"i'i"iifiii L'AFuCFe-tf "rrr: __ "--uef-ca--'1-----s, when CT is more charged, the base potential of Q7 rises highér than that of Q8, and the Is, Q10, and Q11_are turned OFF to release the muting . Discharge and. charge curve of CT :55 ------------ ------1raxtivm, V . so 0 ti 1 o c..?: (13339 Potential "rut, Ii-fl B6 p ten m f Q7 Mrggg " ' - - T - - .% _________ 13E- Base potential of 065mm ...-- . f‘ . . -- . I tP-t t, " --- -"t--T" - - -- --C ----- - Base potential of. qar-aumm o ' -! VTH I M tl time D t 1 A B n ‘MT(TR) I ll nit y r gger or o , h , ' 0 1 2 5 ' ti L Q1 at power ON t(sec) (Dischaga OFF) _ At the starting time of trigger Input Fig. G Respective Operating Potentials at Mating by Trigger (A) pr (B) 3. MUTING AT POWER OFF When the power supply is ON, rectification from AC makes ls 0N and Q3 bFF. When AC is OFF, Q4 is OFF and ol is ON to dischage CT for stating muting dperac ion . -261 - =¥Z=AUDID LINEAR IC TJllTdT. c. Inning: a ‘E‘: TOSHIBA, ELECTRONIC me man anwau? 001.7105 El T, Mann "r''-"": L" 90‘972217 c.,'.r.,,i.'.iij,ijj,,,),ii,i(,';,'-' _',/.i,ii"-rs,ii)iiiir,riii:'i . _ (',_,i.,i'i.i,I,i, 17,105 r,-,,?,' 7-77-21 '''"'ci'ic'iicciiiii"ii'iuii' APPLICATION v00 1 SUPPLY V0LTME (v2_5) AND SUPPLY CURRENT (12) It TA7324P contains a regulated power supply. I Therefore, as shown in Fig. A, the voltage ls applied _ T917524? to pin 2 through the resistor hs The supply current 12 is, in this case, adjusted to about mm by difining i? the value of RB. According to V2_5 to 12 characteristics shown in Pig. l Adding bias to Fig. 1, when 12 = 10mA, va-s E 3.5V is given. Pin 2 _ V - V - Thus, h, = -1-'-c-c-i-se-2r-5-. (kit) For muting operation V2_52 2.8V is required. As shown in Fig.1 if the current of 12 > 3mA is flown, the muting function starts operating. 2. TRIGGER SENSITIVITY ' f T V2.5E35V ' Trigger sensitivity means the Mating ON / positive ' trigger ,/ sol te value in the di ference ab u f " sensitivity” between the trigger terminal v61t- j Pin1 and Pins Do Potentials age at the start and the open Mutégg (Cr-r-trr-rr-r..,-.-...-'.)'," a L4~15v voltage of trigger terminal. I? _,,.,,-,,-::,.-:-:,-'"?" (Open) Refer to Fi . 5.) _ -tr, nasatlve ( g mung ON {/\tr188°r g J eeneitivi y. GND(cV) Trigger current is the value Trlggsr t Trigger B (Pin 1) (Pin a) of current flowing Into or from the . . IN .5 Trigger Level trlgger terminal at start of triggering. g In TA7324P, the circuit is designed for discharging securely the timing capacitor even if a trigger of extremely narrow width is applied to the trigger input' terminal. Consequently, the trigger is applied to even the Input of pulse width less than lms, so that an er- roneous operation may be caused when by a hair-like pulse is applied '.rc:razTOSHIBA:zrrcra'ri: :: 555:: '" w ?yamza :m,3 = gg T."arta=a= ' TOSHIBA1 ELECTRONIC DE DED 30373”? DDL?lUE 5 H ' "med-GG.. --s-': . - (r-rr-r-rr-r-r- - “aux .-,v:-.a.. CiGi--T N. " , 9097247 _i',i:i'i'iiii,",t,t:; _iiilj,.i_i,'.i,i,tii'otie .; ;_'-_,;~." v ' =,f?,i,tF, 17108 iy" "-u'"tii:iii"iiicii'liifc-_' to the trigger Input terminal from the power supply or other sources. To prevent such erroneous operation, an integrated circuit of CR may be required to be provided to the input. tivity varies according to temperature an such vartat:iok should be considered In addition, trigger snesi- 1 voltage of va-sl therefore, Mv------ before designing. Trigger terminal 23v- -ti--ssc, Impedance is 15idh,25kn at start of (s BE) l triggering. Iz=5~15mA is recom- ! mended for pin 1 or pin 3 because l muting may not be restored after :2;::go;t _ l " Tdl' $2561, trlggering to mute if 12=15mA or v5 v4 l OPP more is applied. 28V _____ -- l (4VBE) a1V---- " (SVBE) Charge 3. MUTING AT POWER ON/OFF cum (VOW; (Refer to Fig. 6) t t--- 3.1 MUTING AT POWER ON Muting at power 0N continues till VZ-S the timing capacitor CT is charged, and 2.1V (5VBE). potential. ls over about. rises to about for V2...5 3.2 MUTING AT POWER OFF 2.8V (4VBE), Q12.and Q13 Fig. 6 Muting Operation at Power ON -OFF are turned ON, the base potential of Q7 Therefore, early rise is recommended Muting at power OFF starts operating by decreasing the detect- T-77921 ing terminal (pin 4) at OFF to about 0.7V or less (making Q4 OFF.). Therefore, such a signal as is more than 0.7V in normal operation Muting at power OFF starts operating at the but turned to less than 0L7V Instantly at Pinl power OFF, is required to be made. (Trigger A) .time when pin 4 potential becomes less than 0.7V and continues till ll becomes 2.8V or less. Therefore, the slow falling of ll fective. Fig. ' Lengthening Way of is more ef- Muting Time ...... w-umw J."d=Trat,", m-uvmlu mar AUDIO LINEAR "2rrdrri"s: a aim a m: TOSHIBA1 ELECTRONIC na DEE anwau? tl0h7hCl'? i/ H EEEQTRONIC _ -- ott' ’1‘7*1'67““o/ T-77-21 . iiii''fiiiiiiii- TL9_q9riy11r TOSHIBA. The detecting terminal at power OFF (pin 4) is available for trigger Input; however, it is recommended that this terminal be linearly triggered as much as possible, because a narrower width. pulse may miss ample discharge from the timing capacitor. 4. MUTING TIME Muting time at power 0N and casused by trigger ls decided by the timing CT and RT. With the consideration for l, and Q7 base currents, the following are roughly given: Muting time at power 0N t "tom" 1.3RTCT Muting time by trigger t MT E 0.45 C (TR) T Here, If muting time is lengthened by setting RTCT time constant larger, distorted waves asymmetrical with respect to top and bottom may be originated by the slow speed of wave rise at muting OFF. Experiment tells that MT 21.4sec (RT=220kn and CT=4.7uF) or less .has brought a good result. When “T(ON) ls required especially to be made longer, a method of applying the trigger terminal as shown in Fig. 7 and another method of giving a signal of slow rise to the detecting terminal at power OFF. (pin 4) are considered. To activate a continuous muting, the DC volt- age to make muting ON should be applied to trigger A or B, or the voltage of the detecting terminal'et power OFF (pin 4) should be de- creased to make Q4 OFF. Output Fig. B Muting Output; ==‘TOSHIBA _ . atr v» c:1lltc j i -264- F.eaaass a mm = TOSHIBA, ELECTRONIC ua DEI] tircrjriii'? nmnua n u------- - tiy.rr_TPsltrBA. .4 ., V ' _ - . 'tiiici''iiiiifiir" Ip-ttml-tlille -- IL' - - Pr", T ,--t'vie' crrt' ‘QE'EZL‘QS L_D/ T-77-21 o At muting ON, V SINGNAL LEVEL FOR MUTING AND ATTENUATION Since peak value (half wave) and attenuation of signal for muting are decided according to the following conditions, the value of RE is properly required for operation. IN(peak) Rg max Imax is minimum value of maximum sink current. o At muting OFF, peak value and attenuation are decided by emitter- base reverse voltage of Q10(Qll)' and the equation, VIN(peak)§5v’ is given. Let Q10(Qll) saturating resistance be RS, muting attenuation is given by Mating attenuation: ATT---20log RS/Rg RS=(VCE(sat)/Imax EXAMPLE OF APPLICATION (APPLIED TO A PRESET TUNER) Radio tuner Audio Amp . 4) R - MPX . Local Station selector SW LB s) - 'rsl'f' TAvszaP oscil - Fig. 9 Mating Method for PM preset Tuner (1) Utilization of voltage variation added to the variable capacitance diode (2) Utilization of voltage variation caused by station indicator LED 2...“ s,,."' c'ardlr.rardr, 4!: AUDIO LINEAR IC=== a - §§;;: a a n Inzzzuaa asdh = TOSHIBA-u ELECTRONIC Clii! DEB ‘10‘172'4? f3lil1/7hly3 D fl" W1===lz=17 , ' J” w-A-U- ss-rs-''-'--.-,-,-,,--.-,'';'"-- 9°972.51.19?HV¥_B_A-_E_E§9IR0NIC _ 02E ',)l,'i)_iia_". T-77 21 V ''rr-i',.- _ _ _ L... 1 "ii'lihtai' ___ w..- wu_m-....m_.._-_t - 105mg AMMmM~,M-M, - In case of an FM preset tuner as Irv-------" shown in Fig. 9, station selection station from F1 to F2 by the preset station l I / \ . I I k selector switch provides a drastic l A -)v/, variation to the voltage applied to ur variable capacitance diode. ‘\\\‘/ :: All are turned to 'buzz' sound Accordingly, all of the detector Trig. 10 'Bazz'Baunahn DC voltage variation traced in and PTesentTVpe out the rk's"curve and noise between stations as shown In Fig. 10 come out as "buzz" sound. o In case of the above FM preset tuner equipped with a non-shorting type switch for station selection and the station indicator LED (or an Indicator lamp), only LED voltage detection can operate muting securely by using the terminal 1 of TA7324P, that is, the trigger A, as shown by the dotted line in Fig. 9. For example, in case of presetting from F1 to F2, after Sil of F1 turned OFF, MI of F2 becomes ON; thereroie, detection of switch OFF of F1 permits the muting operation to be performed. o Even in case of using a shorting type switch, if the contact of In- dicator MI linked with the preset SW is securely 0N several milli second ahead, the muting operation can be performed by voltage varia- ttdn originated at LED ON." If the shorting type switch cannot secyrely make the bther ewitch ON, the muting starts operating by detecting the Voltage variation of variable capacitance by applying the terminal 3 of TA7324P, the trigger B, as shown by the solid line in Fig. 9. However, in case where F1 and F2 are the same station or close stations at reception each other, no muting can be operated. (Variation is within several mV of variable capacitance diode voltage.) TOSHIBA1 ELECTRONIC DE DEI] “10:1?Eq? DDL'HJLU 7 fl _.____ _ W--. “5 ' Iirttitftlpfrrt71 (fibit" It1.tp.__rp" ""1iiju'ici""iiiiiii" T-77-21 TRIGGER emsxnvm! 1mm A(V) TRIGGER smsxnvIn flRIG A(V) TERMINAL vommmrmz) 72-5w) Ira-. 5 - 100 Fig. ll TERMINAL VOLTAGE(PIN2) v2_5(V) -1o -5 o ti 10 15 20 25 surpm' CURRENT Iccom) iTRIG A- Ta Fig- 13 Ico=10mA E level TRIGGER SENSITIVITY i‘IRIG B(V) '40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE Tact;) RI - - . La ItT G A V2 5 Pig. 15 Ta: 25'6 M B level . TRIGGER smsrnvui :t'rnm B(V) L level 305 51 3.15 5.2 5.25 3.5 -15.i5t5 3.4 TERMINAL VOLTAGE(PIN2) v2-5(V) Vg- Ta. Fig. 12 Ioc=10mA ~40 -20 o 20 IO 60 Bo 100 AMBIENT TEMPERATURE Ta (tr) :tTRIG B - Ta Fig. ll Icc=10mA L level 0.1 H level ~40 -ao o 20 IO 60 BO 100 AMBIENT TEMPERATURE Ta (ta) iTRIG B - Ira-ts Fig. 16 Ta=25'C H level L level 5.05 3.1 3.15 3.2 3.25 5.3 5.55 3.6 TERMINAL vonnempmz) v2-_5(V) 4: razzuAUDID LINEAR "2,'r'r'a'rat -NRl.F.-.._e- " tg.at.= 1 .oal TOSHIBA, ELECTRONIC 02 Dan “IDENELI? nunnl =1 T '.iirt:t9rFiT-ri5tiit BA @EE'E’CTRON I c: --, "ff ---_------- _ "))'2sirfrirf _ D V4 OFF - Ta SIGNAL SOURCE RESISTANCE 113042) ATT - R8 Pig. 18 Ta=25'C ICC: lOmA VIN = 500 mVrlns f=1kHz -40 -20 _c 20 40 so so 100 20 30 IO iso 60 70 so 90 AMBIENT TEMPERATURE Ta(‘b) IIUTING ATTENUATION ATT(dB) .,===TOS'HIBA . r:
