ELECTRONIC TELEPHONE CIRCUIT Provides Basic Telephone Station App

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ELECTRONIC TELEPHONE CIRCUIT Provides Basic Telephone Station App

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MC3401OA MC34011A
ELECTRONIC TELEPHONE CIRCUIT
Provides Basic Telephone Station Apparatus Functions Single Including DTMF Dialer, Tone Ringer, Speech Network Line Voltage Regulator DTMF Generator Uses Low-Cost Ceramic Resonator with Accurate Frequency 'Synthesis Technique Tone Ringer Drives Piezoelectric Transducer Satisfies RS-470 Impedance Signature Requirements Speech Network Provides Two-Four Wire Conversion with Adjustable Sidetone Utilizing Electret Transmitter On-Chip Regulator Insures Stable Operation Over Wide Range Loop Lengths 12LTechnology Provides 1.4Volt Operation High Static Discharge Immunity MC3401 Provides Microprocessor Interface Port Auta. ,,>. ,<,?~ -r,.
44-PIN `PLCC CASE 777A-01
SUFFIX PLASTIC PACKAGE CASE 711-03
Line Voltage ReguIator
,.(J
-l-l---
Receiver
MC34010NIIA
MOTOROM
Ring
Electret Microphone
document contains information product. Specifications information herein subject change without notice,
INC., 1985
AD1745RI
MAXIMUM
RATINGS
(Voltage Referencesto Value
+18, -1.0
CONNECTIONS Unit
Parameter
Terminal Voltage (Pin Voltaga (Pin Voltage (Pin Voltage (Pin Terminal Voltage
Terminal Terminal Terminal
2.0, 2.0, +2.0, *loo
(With Tone Ringer Inatiive)
RI-R4 Terminal Current (Pins 1-4) CI-C4 (Pins 5-8) 1/0, (MC34010A onlv) Operating Ambient Storage Temperature Temperature Range Range
+12, -20to -65to
-1.0
+150
*l/o
GENERAL CIRCUIT DESCRIPTION
Introdutiion Electronic Telephone Circuits (ETC) provide necessary elements tone disling telephone single The, functional blocks
MC34010WI include DTMF dialer, speech network, tone ringer, line interface circuit (Hgure MC3401 also provides microprocessor intetiace
.,.;,).% common, electronic' speech network operating parallel with conventional telephone receive li,~ `voltages below volts, DTMF dialers operate at~rn~:%
ilarly low-line voltages when signaling througp$.xy powered station carrier equipment. These l~$,#o[$Bge requirements have been addressed r'@~
MC34010WI bipolar/12L technol~,@~$&~fi appropriate circuit techniques. resulti~ ~bch dialer circuits maintain specified p,@@o$Wnce with instantaneous input voltage low&S ,,~:i. volts. ,,<%:$,:~, f:\,
automatic dialing features. voltage operation necessity telephones networks where parallel telephone connections
port that facilitates
.l,<ky,,., ,::> ~$'.?l, `+.*,:\.>.,.,%\>. \'.'L.:.\,
**MC34011 only. `$*8 ~,><<, ~@URE INTERFACE CODES ~,.?>~:t.i,+ .t:',ti,,
.:,*J ,lw,:i<,,,
\.i.iL .,,?' ~"!~ ,.,Ft,,:i\>.~ \b'.>+.,. ,$~,,.:> ;.wi:. .*~\ ,,,,,,h `.~,! *MC3401 only. !.+`s,
Voltage Regulator ~.:t~t.$ line interface cir@j~YFigure determines input characteristic'',~f telephone. input voltages (less tha~'f$.ahs) draws only ,-L.~, >,.>., ,,,), .'$?~,,j>l,.,, .,.> 3+,, *',:, .'s,.',., FIGURE 3~4;~:~NE y::, ,~i,~. `$Pi*, INTERFACE BLOCKDIAGRAM
Keypad
Column
Code (B~BO)
1111 0111
`--?TelePhone
1o11
1101 0101 1001 1110 0110 1010 0100 0011 0001 0010 0000 1100 1000
Voltage Regulator
Line IVR+
MOTOROLA
Semiconductor Products Inc.
`GENERAL
CIRCUIT
DESCRIPTION
(continued) terminal driven through external network control receiver sidetone level. switched resistance terminal reduces receiver signal when dialing suppresses clicks hook keypad switch transitions. When transmitting, audio signal currents (iTXO iRXO) flow through voltage regulator pass transistor drive telephone line. This feature consequences: transmitting mode receiver sidetone current iRXO contributes total signal line alonq with &.Ko; impedance telephone d~tej,@~$~y receiver impedance voltage ga?b line receiver amplifier output. -?.:.~?,:{,*,,. ,.~' :$$' +$\:',*:\t+\ Equalization Circuit (MC34011A O@J~yJ$ equalization circuit varie~'*~@nsmit, receive sidetone gains with loop,~u~,@to compensate losses long lines. L~$&{mikal voltage varies diequalization circuit rectly loop c4q&~$:The ~.,`$ ~.'. :.t. senses this voltage a~d<.sfibhes external resistors between ~ti?across capacitor (Figure when loop c~=m'exceeds threshold level. speech netwo~b~pe~ties with full transmit, receive sidetone gai&&J&@?long loops. short loops '):.}?,., voltage e~e~the threshold these gains reduced,~$h~?eshold detection circuit hysteresis,.to$~event distortion speech signals when t~hone operated threshold current.
sa~:.,$ ,+)., ,,,/,$-, ,</. -'\J\
speech dialer bias currents through regulator. input voltage increases, conducts excess line current through resistor volt level shift prevents saturation with telephone line signals volts peak (+5.2 dBm). constant current (dummy load) switched when DTMF dialer activated reduce line current transients. Figure illustrates voltage/current characteristic MC34010NI telephone.
FIGURE CHARACTERISTIC
Speech Mode
Operable
Line Current (mA)
.120
Speech Netvvork speech network (Figure provides two-tofour wire intetiace between telephone line instrument's transmitter receiver. electretl~icrophone biased from drives transmit am~{~$ very loud talkers, peak limiter circuit transmit input level maintain dis~rthfi~ transmit amplifier output signal invert~;~$~h% ~J*.-,.\!l ,>$$. ,;+~:$:,,,.
Ff~(~8
+,$QmF Dialer Keypad interface comparators activate column tone generators (Figure when column input connected through SPST keypad. keypad interface designed function with contact resistances leakage resistances Single tones initiated repressing keys same column.
BLOCK DIAGRAM
SPEECH NEWORK
Telephone Handset
MOTOROLA
Semiconductor Producfs Inc.
programmable counters employ novel design produce non-integer frequency ratios. various DTMF tones synthesized with frequency division errors less than &0.16% (Table Consequently inexpensive ceramic resonator used instead quartz crystal DTMF frequency reference. Total
frequency error less than kO.8Y0 achieved with' kO.3Y0 ceramic resonator. column convetiers produce 16-step approximations sinusoidal waveforms. Feedback through terminal reduces DTMF output impedance approximately satisfy return loss specifications.
FIGURE DTMF DIALER BLOCK DIAGRAM r--'----
;:::,
eypad buIrlparaters `i-Q,I n":3,
Column Counter
Column
Encoder
,,,,,,,,
AR21
"L"""
~c:$er~
Tone Ringer tone ringer
square when wave output
(Figure
dtive
::,. clocked
through
generates
piezo
war~'n~.t
.g~w$t
microprocessor.
Data transferred
data flow
sound
terminal,
direction
line voltage exceeds pre,~@'@fied threshold level. threshold detector ~j~$~$urrent
mode comparator prevent on/off c~{~[tihen output current reduces volta&@~v@lable Into tone ringer input. When average ~rr~nf
ringer exceeds threshold ti~a+fie ringer output commences driving thep~zo;kransducer. This output current sourced from ~$~?~ases average current measured ,Jhr~,@]d detector. result, hysteresis produc~,{~ween tone ringer ~"~@frequency alternates thresholds. between fot8 an&~&<~& warble *)::*, ,\.?> rate fo/640, where
determined Data Direction (DD) input terminal,
manual dialing mode, Logic four-bit code from keypad DTMF generator digital multiplexer also output
terminal through four-bit shifi register. data sequence terminal transferred negative edge clock input (~). this mode shift register load enable circuit cycles register between load read modes such that multiple read cycles single-key closure. complete from clock cycles required output data reload register second look. automatic dialing mode, Logic code serially entered sequence
ringer~$$~lator Micropro$~s#fiintetiace
frequency. (MC3401 Only)
four-bit
Th~tetiace connects keypad DTMF se~io~;oflhe microprocessor storing numbers dialed. Figure shows ret~ykg majd~ blocks interface section interconnections between the' keypad intetiace, DTMF generator microprocessor. Each button number keypad represented four-bit code (Figure This four-bit code used load programmable counters generate appropriate column tones. code transferred serially from microprocessor when shift register
into four-bit shift register. Thus, only four clock cycles required transfer number into ETC. keypad disabled this mode. Logic Tone Output will disable tone outputs until valid data from microprocessor place. Subsequently switched Logic enable DTMF generator. Figures show timing waveforms manual automatic dialing modes Table specifies. timing limitations. keypad" decoder's exclusive circuit generates output signals. output indicates (when Logic "l") that one, only one,
`MOTOROLA
Semiconductor Products Inc.
depressed, thereby indicating valid data available MPU. output additionally used initiate data transfer sequence microprocessor. output (when Logic "l") indicates DTMF generator enabled speech network muted. connected source volts (generally from microprocessor circuit) enable pullup circuits microprocessor interface outputs (DP, 1/0). Additionally, this voltage will
power entire circuitry (except Tone Ringer) absence voltage This permits transmit receive amplifiers, keypad interface, DTMF generator non-typical telephone functions. Figure typical interconnection MC6821 (Peripheral Intetiace Adapter). Connection port other class microprocessor will similar.
FIGURE TONE RINGER BLOCK DIAGRAM
Piezo
Tone Ringer
Shifi
Register Loaa Enable
4-Bit Shift Register
~l,m
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Semiconductor Products Inc.
.!-,
FIGURE OUTPUT DATA CYCLE FROM MC34010A NOTE: Depressed
(Tone generator
enabled) desired. Released
~tDpcL
1tDv
FIGURE
.,?$.i,
.:t.
tDS-1~ tDDCL
Digit TABLE TIMIF DTMF Output 0/0Deviation from Standard 0.086 -0.104 +0.141 -0.128 -0.108 0.067 +0.156 t0,061 >ymbc Parameter Clock Frequency Clock High Time Clock
Digit LIMITATIONS
tiin Jnii
Figs.
Standa&$~ .$~'~equency with (~zj Oscillator ,f{;&$ ''+&* 696.4 &.:%&q\@ 769.2 ~t,;?$+>>8S2 853.2 939.8 ~:., vx*!41 "'941 ,,*:$ -`:/. qoi$ki'v 1209 1207.7 q~$dti 1336 1336.9 C*iumn 1477 1479,3 Column 1633 1634.0
9,10
Rgs.
9,10 tr,tf Clock Rise, Fall Time Clock Transition tDpcL
Data Valid Time from High Fig. Fig. Fig, Fig. Fig. Fig. Fig.
tDDcL from High tcLTo
Data Setup Time Data Hold Time Time&om Time from High High
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Semiconductor Products Inc.
DESCRIPTION (See Figures
(DIP) Designation RI-R4 Keypad inputs Rows through When open, internal resistors pull inm: regulated (=1.1 volt) supply. normal operation, column input con-} through SPST switch telephone keypad. inputs also activated ~$$~c ,\y' (<500 from microprocessor port. ,.~,i$$\<~\ Keypad inputs Columns through When open, internal resistor~&"wn column inputs normal operation, connecting column input,+~ ~,Y,~fow input produces respective coiumn DTMF tones. addition being ~,~he~ed input, column inputs activated Logic"1" (>600 <3~@.K~,:F DTMF keypad depressed. exernal component identifications.)
Mute/Single Tone (Output) Logic"1" indicates an?~$~J~&l#rnn tone being generated. .~%". ,".' Logic indicates tone generator disabled. ,i;,a. :,Y4, Power Supply (Input) Enables pullups m%~processor section outputs. Additionally, this voltage will power entire circuit (e~w~ne Ringer) absence voltage ,$+:<>:,.,, *:\i. lnputiOutput Serial Input Output data (~,e~$rm$dd input) from micropro-. cessor storing retrieving telephone n&~$.bW''Guaranteed Logic powerup "".y,.+ Logic "O." Data Direction (Input) Determines d~%tion data flow through pin. Logic input DTMF gener~t~,, Logic "O," outputs keypad entries ~>',[h microprocessor. .,,. .,]\ Sidetone Equalization termina~$~$$~e~s external resistor between junction loop currents greater th~t~p equalization threshold this resistor switched into reduce sidetone level. Clock (Input) Seri#~ shifis data pin. Data transferred tv~icallv kHz. `$~. negative edge
1/0'
ES**
EV**
Voice Equaliza~&~$~inal connects external resistor between loop length equalization. currents greater than equalization threshold this resistor switched e%g!~t~on circuit reduce transmit receive gains. Ceram~''%*~ator oscillator input feedback terminals, respectively. DTMF dialer inte@e&~'~operate with ceramic resonator from which column tones s&&H'_d. ?wr&hone `~?~sponse ,@lcrophone
16,17
CRI,
Mute. provides means mute microphone transmit amplifier digital control signal. When this connected Logic (>2,0 return path transmit amplifier output disabled.
Automatic Gain Control low-pass filter terminal. Capacitor connected between sets attack decay time transmit limiter circuit. This capacitor also aids reducing clicks receiver hook-switch transients DTMF on/off transients. conjunction with internal resistors, (1.0 forms timer which mutes the" receiver amplifier approximately milliseconds after user goes off-hook releases DTMF Key. Microphone negative supply terminal. current from electret microphone returned through MacTerminal which connected collector on-chip transistor. base' this transistor controlled either internally mute signal from DTMF aenerator, externally Ioaic inDut
Transmit Input Limiter. transmitter input level prevent current controlled resistors
internal variable resistance element terminal controls prevent clipping with. high signal levels. Coupling capacitors flow through TXL. dynamic range transmit peak limiter R13.
Transmit amplifier Input. input transmit amplifier from electret microphone. coupling capacitors allow offset maintained approximately above feedback through resistor from TXO. Transmit Amplifier Output. transmit amplifier output drives current through voltage regulator pass-transistor resistor RIO. bias voltage typically volts
above transmit amplifier gain controlled l/(R12 R13) ratio.
**MC34011A only. *MC3401OA only.
(continuel
MOTOROLA
Semiconductor
Products
Inc.
DESCRIPTION (continued)
[PLCC) (DIP)
Designation
Function SideTone Amplifier output. output sidetone inverter amplifier whose input driven transmit signal TXO. inverted transmit signal from subtracts from receiver amplifier input current from thus reducing receiver sidetone level. Since th~:~ transmitted signal phase shifted with respect reactive impedance of~<~., phone line, signal from must similarly phase-shified order provide a4ma~J sidetone reduction. This phase relationship between transmit signal thea~,e@&@e .TJ:,C,.,.$!? cancellation signal from controlled ,.!>"`.#J: Receiver Amplifier Mute. switched resistance terminal attenuat~s~k~ceiver amplifier input signal produced DTMFdialing tones also mutes cli~tti~:receiver which result from keypad hook switch transitions. resistance ~,~i~ ,~fcally mute mods otherwise. Coupling capacitors pr~e~ current flow .,*$,,:] through *?.t~ Receiver Amplifier Input. input terminal receiver a@~pr which driven signals from STA. Input coupling capacitor allows ~biased approximately `,~k~ volts above feedback resistor `i%. Receiver Amplifier Output. This terminal connected ~$$~%$ctor output transistor through receiver receiver amplifier. bias current output deti~:?$-sourced from bias voltage typically volts,#%ve tfie Capacitor from provides frequency compensation rec~i%s)%~lifier. ,,.,!" .,.J. Amplitude Calibration terminal DTMF dialer: ~$si~r'R14 .i,rt~ DTMF output signal level Ring,<$$'a from controls
Voltage Regulator output terminal. t~@out&~ volt voltage regulator which supplies power speech network amplifier$i%~d DTMF generator during signaling. improve regulator efficiency line curren~ad[%ns, external pass-transistor used regulator circuit. Capacitor fre~en~ compensates regulator prevent oscillation. common bridge.
(more negativ~&$F;onnected .$*.
~.:;,
Ring through polarity guard
Load Capacitor. Capaqitor from forms low-pass filter which prevents resistor from load~ speech DTMF signals. Load Resistor. ResF&~r% from determines input resistance Ring. This rasistor e~'?hot only enable programming resistance also avoid high on-chip pq@~. df~ipation with short telephone lines. acts shunt load conducting excess dca~&~#ent. line voltages (<3.0 volts), current flows through Base P*~&&:transistor.
fall~,~'1.1 volts,
Under long-loop conditions where line voltages would cause drives transistor i,nto saturation, thereby minimizing across pass transistor. line voltages which maintain above volts, linear region thereby regulating voltage, Transistor also couples signals from transmit amplifier Ring positive input regulator, speech, DTMF sections connected Ring
olarity guard diode bridge, "$!$ Feed Back terminal DTMF output, Capacitor connected from ~?,. ,,., "{;;.:t~r ,,,!, feedback reduce output impedance Ring when tone dialing.
provides
Tq~4$ ""+'
~.s,. ->,+,> :,"t.& ~.$~*., ,.~.$,.:a,
Tone Ringer oscillator Capacitor resistor terminal. relaxation oscillator frequency resistor capacitor connected from Typically, (R3C13 #s)-
Tone Ringer Input Sense. most positive input terminal reference threshold detector.
3~w:
~TtiS
tone ringer
\,&, ,,?,:;y;y'> !,:, ,,.* :.:l<.+!>:.
Tone Ringer Input terminal. positive supply voltage terminal tone ringer circuitry. Current supplied through resistor When average voltage across exceeds internal reference voltage (typically volts) tone ringer output enabled. Tone Ringer from fo/8 with 12,5 swing implemented Output terminal. frequency square wave output signal alternates fo/10 warble rate fo/640. Typical output frequencies 1000 warble rate. sources sinks produce output voltage volts peak-to-peak across piezo transducer. Tone ringer volume control variable resistor series with piezo transducer.
Tone Ringer Input Filter capacitor terminal. Capacitor connected from forms low-pass filter. This filter averages signal across resistor presents this voltage
input threshold detector. Line voltage transients rejected duration insufficient charge volts.
MOTOROLA
Semiconductor Products Inc.
ELECTRICAL CHARACTERISTICS KEYPAD INTERFACE CIRCUIT
25"C)
Test
Charasteriatic Input Pullup Resistance Terminal: 1,2,3,4 Column Input Pulldown Resistance column Terminal: 1,2,3,4 Ratio Row-to-Column Input Resistances 1,2,3,4 Km;n 1,2,3,4 Terminal Open Circuit Voltage Method Symbol Km,n 0.88 ,,,, $':? Unit kQ:.,, .!\?,> ,*X., .i%t$,?! ,;,, <.,\ .$,),
g.>s *:}d ,:.,.tt: ,,,.! s:~:. .J.e,,i~, ,!J!" mVdc
vROC
Threshold Voltage Terminal: 1,2,3,4 Column Threshold Voltage Column Terminal: 1,2,3,4
`@oo Y:*, !,,;.". 0.70 vROC -.>:.,!:, y`:.<.$,,{: *(+?b ,!:<, ,,.$,yi;t .,,>> \.,,~. ,{$,+. 0.30 VROC `,.*,$,,*:> .:'~< .$)i~ `":$:' !?.R$, .,$,
1100
MICROPROCESSOR
INTERFACE (MC34010A
only)
\,it' *-:.
~.,:i>: ,\$: ,$:,.
,?:.~:: ,.`it.:h
Voltage Regulator Output Regulator Input Current
~:,:, `.,~,
0.95
Off-Hook
,J,' $':~.,. \,.::>, .*>, .,.,>' .,.,.,, .&.*Y ,:., ~,s,,,, ,$+. `N>: :,~.:,. ,.,,. ,.:L> .J.,*$;., .\T:;,t\,5 .,-,>,:.
.~'")~$ofi
$>%~(on)
Input Current On-Hook
Input Resistance (DD,
Input Current (1/0) Input High Voltage (DD, I/O) Input Voltage (DD, 1/0) Output High Voltage (MS, 1/0) Output Voltage (MS, 1/0)
LINE VOLTAGE REGULATOR
Voltage Regulator Output Current DTMF Mode
j:'"' "':" ,f>:$}'~<o'""
.:7$y.,, `,><:;\*:&?
AIDT
14.5
volts
Change with Cha@'@:@W#' Voltage Current Speec~ M'%$ ;):t:?"
,t,,,~*' N!>,, .:$, ,i+pt"
-6.0
mVdc
Speech Q~<$~#de
Current Difference
AITR
AVLR
-2.0
Level :#}w5,~:~, ~.~: ~$:,@ L&*~#t+~ inal Resistance ~$ti~ Regulation
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Semiconductor Products Inc.
ELECTRICAL SPEECH
CHARACTERISTICS
(continued)
NEWORK Test Method Gain
Characteristic Terminal Terminal Terminal Terminal Terminal Saturation Voltage
Svmbol vMlc IMIC BTxO lTxl VTxO( VTxO( GSTA
0.48 16.5 0.40
0.53
Unit mVd$$., ,&p$,, ,,$; @J'""
Leakage Current Input Resistance Bias Input Bias Current
0.68 *,~.:_ 4@:''$''":4 ,,\$'~*(?$'" "$8i@ 0.54
mVdc mVdc
Terminal Positive Swing
Terminal Transmit Sidetone Negative Swing
Amplifier Amplifier
Closed-Loop Gain
!~$:,, ,,@i*pQ~$ ,,,, ?;$&$&+'
Terminal Output Current Terminal Bias Terminal Input Bias Current
Terminal Terminal Positive Negative Swing Swing
ISTA BRxO
lRxl
0.48,,,
`<<;:~52
mVdc
0.68
4:.*+~,$.:.~?. e:.tc:.,,> ,<:. +.$l VRxO( VRXO( ~$:,>:t?w': RTXL(OFF) `+%>125
mVdc
Terminal Resistance Terminel Resistance
,:~:a:~fl *<*S+ .;$~ >"4$6 ,,.L,<,, ,,:?. lt~:?,,+$~
RT~&~Q~i ~\r, ~v'i<p *:~HM(ON)
,,.3.
Terminal Resistance
Tarminal Resistance
DTMF GENERATOR
Frequency
Tone
692.9 765.3 848.9 935.1
696.4 769.2 853.2 939.8
699.9 773.0 857.5 944.5
.\~m\. !.*,. <f?*$*,~LT IIc, Column -~.;., \+,* :.,1. >,\i.,,*:, Column 11+. :.pl:* Column `b~j. Colu m%.~'v ,,~y ,?,. \:,.f$*??t*. ~s$-: Tone Amplitude Column Tone Amplitude ,~J~.8$~$&Ll~: .~.k:., Column Tone Pra-emphasis $&<$) ,lt~. DTMF Distortion "$'. .!,~,. .,,::,:,,
Column
Tone Frequencv
1201.6 1330.2 1471.9 1625.2 0.38 0.48
1207.7 1336.9 1479.3 1633.4 0.45 0.55
1213.7 1343.6 1486.7 1641.5 0.55 0.67 .6.0
VROW Vcol dBCR
Vrms Vrms
DTMF Output Re,*R&
EQUILIZATldf.bNTROL .>,:. ,,,.
.<+.l,
(MC3401 OnIv) .34a
Termi,~f ~h~Resistance EquilJm#kX$rashold
E~l~on
RES(OFF) REV(OFF)
REV(ON)
mVdc
Voltaga
Hysteresis
Threshold
Ev$$%rrn[nal
Resistance Resistance
Terminal
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Semiconductor Products Inc.
ELECTRICAL CHARACTERISTICS TONE RINGER Characteristic Terminal Voltsge
(continued)
Test Method
Symbol VTRl ITRS
21.5
Unit ,.\\ ":l}.:, ;%::~,,,, <$$$A mVdc
Terminal Input Current VTRS volts VTRS volts Threshold Voltage Threshold Hysteresis
VTRF
1.8:":
AVTRF
RTRF VO(P-P)
11.5
,~:a~yii:<$ .$$$,>d$p+
ihJJ#7 13.5
Filter Resistance High Tone Frequency Tone Frequency Warble Frequency Tone Ringer Output Voltage
Vp-p
8@;;$Q, ,J$$;f$;+. `"3.+4'. ~,-. .<8$2'b .+:-.,>. .<$+::,(.
D.U.T.
+0.047
2N4126
0.047
TXAC 0.01 :0.047
(ES**) (EV**)
Notes: *Seletied ceramic resonator: A2.O kHz,
Capacitances unless noted. resistances ohms. numbers this Hgure Test Circuits package. **MC34011A only.
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Semiconductor Producfs Inc.
FIGURE TEST
FIGURE TEST
General Test
Circuit
General Test
I$ov,
Circuit
General Test Circuit
Meaaure VLR; Calculate AVLR Repeat Test with
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.,.:,
FIGURE TEST FIVE
FIGURE TEST
General Test Circuit
open measura VLC. Close measura ILC. Calculate:
FIGURE TEST EIGHT
I.ov
General Test Circuit
Subscript corresponds column number.
Terminal VROC c,d,e. Repeat Test 2,3,4, I.OV
measure ICI. Calculate:
b,c,d. Repeat Test 2,3,4,
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FIGURE TEST WELVE
FIGURE TEST THIRTEEN
I.ov
Notch Filter
General Test Circuit
Single Pole
Note: notch filters must have attenuation respective center frequencies, Measure with true voltmeter. Vl(rms) V+(rms)
their
Calculate:
FIGURE TEST Fl~EEN
ITRS
General Test Circuit
i20v
Meaaure ITRS with Measure ITRS with
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FIGURE TEST SIXTEEN
FIGURE TEST SEVENTEEN
General Test
Urcuit
General Test Circuit
.,>.
Increase from until VTRO switches Note that VTRO will square wave. Record this value Calculate: VTRF
Decrease from setting Test until VTRO
ceases switching. Record this value Calculate:
AVTRF=
lTestvil
Test
MC14011B MC14538B
VDD=12V 2N3904
Measure frequencies
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FIGURE TEST NINETEEN
FIGURE TEST TWENTV
VTRO
General Test Circuit
2*V: i20v
General Test Circuit
Measure VTRO peak-to-peak voltage swing. Using VTRl from Test Calculate: Vo(p-p) VTRI VTRO
FIGURE TEST TWENTV-TWO
General Test Circuit .**-
VTXO
VTxl
With open, measure VTxO. Using obtained Test Calculate: BTxO
`.ya
measure lMIc,
With open, measure VTxO VTxl. Calculate: ITxl (VTXO VTXI) Close Measure VTxO. Calculate: VTxO( VTxO where obtained from Test Close Measure VTxO. VTXO( VTxO.
measure IMM. Calculate:
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FIGURE TEST TWENTV-THREE
FIGURE TEST TWENTV-FOUR
General Test Grcuit TXAC l.OkHz
generator mVrm~. Measure
VOltage VTXO, calCUlate:
Measura voltage VSTA. Using VTxO from Test calculate: VSTA GSTA
FIGURE TEST TWEN~-FIVE
,It.$$
FIGURE TEST TWENTV-SIX
General Test Circuit
Wit#,+$~J@p-en, measure VRxO. ~$~late: Using obtained Test
Vrms
BRXO VRXO
position with open. Measure lTxL. Calculate: (OFF) lTxL,
open, measure VRxO VRxl. Calculate: i~xl (VRxO VRX1) Close Measure VRxO. Using obtained Test calculate: VRxO VRxO,
position close Measure voltages VTxL. Calculate: RTXL (ON) vi~xL
Close measure VRxO. VRXO( VRxO.
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FIGURE TEST TWEN~-SEVEN
FIGURE TEST TWENTV-EIGHT
General Test Circuit
With open position measure IRM, Calculate: RRM(OFF) =0,4
Vrms
Close switch position Measure voltages VRM. Calculate: RRM(ON) xlOkQ
FIGURE TEST THIRW
General Test ~rcuit
Measure each three inputs. each, calculate: V/Iin
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Inc.
FIGURE TEST THIRTY-ONE General Test Circuit
FIGURE TEST THIRTY-FOUR General Test Circuit
500Q
FIGURE TEST THIRTY-MO
Measure
4ak48k
Close measure Close Measure
General Test Circuit
~+l.ov
General Test Circuit
FIGURE TEST THIRTY-THREE
10.1
Vrms
With position Measure Calculate REv(OFF) lEv. $:':' O.aV ~$,~ position Measure VEV. Calculate
voltages Pins
Close Forq~*:to Apply clock puls~+~k~in Open decrease
REV(ON)
M::*$WWOL
`.,:+~' :;;:i.
,:$,
.\.\ ,>,.,i,
\{',&
\*\$
specify typical application circuits MC34010A MC3401 Complete listings external components provided this section along with nominal component values.' hook switch polarity guard bridge figuration several options. bridges used, tone ringer other speech dialer circuits, then hook switch simplified. Component values should varied optimize telephone performance parameters each application.
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.:.,~,.:;$.t
APPLICATIONS
INFORMATION
relationships between application circuit components certain telephone parameters briefly described following:
On-Hook Input Impedance
C17, significant components on-hook impedance. dominates frequencies, high frequencies provides non-linearity required impedance signature tests. must generally <1.0 satisfy impedante specifications. (EIA RS-470)
MOTOROLA
Semiconductor Products Inc.
Tone Ringer Output Frequencies control frequency (fo) relaxation oscillator. Typically (R3C13 @)-l. output tone frequencies fo/10 fo/8. warble rate fo/640. tone ringer will operate with from kHz. should limited values between Tone Ringer Input Threshold Afier C17, chosen satisfy on-hook impedance specifications, chosen desired ring start threshold. Increasing reduces input voltage required activate tone ringer output. should limited values between Off-Hook Resistance conducts line current excess speech dialer bias current. Increasing increases input resistance telephone line currents above should selected between 1200, Off-Hook Impedance input impedance equal receive amplifier load impedance RXO) divided, receive amplifier gain (voltage gain from RXO). increasing impedance receiver increases impedance telephone. Increasing gain receiver amplifier decreases impedance telephone. Sidetone Level Sidetone reduction achieved cancellation receiver amplifier input signals from determine phase sidetone balance signal voltage junction should 180° phase with voltage selected such that signal current slightly greater than that This insures that sidetone current receiver adds transmit amplifier output current. .$4?
Microprocessor Interface (MC34010A Only) microprocessor interface lines (~fi~:~ 1/0, connected direqtJ%,~$w*~ort, shown Figure line (Depre#&*shbutton) also connected interrupt lJ@Q$to.*fgnal microprocessor begin read da$~y$nce when storing number into memory. Th&w@4010A clock speed requirement slow enoug@~typ~$ally kHz) that ,:#l\$>.,.!)
necessary divi,Q@$@w processor's system clock, rather .,.,,< pati eut~ut toggled. This fa,?.;,\ cilitates synchronlzl~ t~<clock data transfer, elim,;>&*:. inating need f~s:%~?dware generate clock. pi~,~st maintained Logic when micro,$~@~%~&F section use, permit normal o~erd$ldn keypad. Wh@~:J&~icroprocessor intetiace section DTMF Output Amplitude us,% tti~$upply voltage (A+) disconR14 controls amplitude colu"mn m%ed conserve power. Normally speech cirDTMFtones. Decreasing increases level tones ~i$%$~tr~ powered voltage supplied generated ratio column tone .%jJ~J$.~minal (Pin from telephone lines. During this amplitudes internally fixed. should greater ~:p. time, powers only active pullups three .,,. than avoid excessive current DTMF output `!.s microprocessor outputs (DP, 1/0). When ,,*. amplifier. s,-' telephone "on-hook," falls below volts, .*;~$!\+\ power then supplied telephone speech `~,\.:t? Transmit Output Level dialer circuitry from Powering circuit from controls maximum signal ampl~t*$!t@roA+ permits communication with microprocessor, duced transmit amplifier. De@,@~ and/or transmitand receiver amplifiers, while increases transmit output signal V$~@@should telephone "on-hook." greater than limit curre~$~%%btransmit `"f. ,,$J, amplifier output. `?ki .,,. ,<J., :qbc*&' Equalization Speech Network(MC34011A Only) ,\\* Transmit Gain :\j, ~$,),> Resistors switched into circuit gain from microp,P@&w@ telephone line when voltage terminal exceeds equalvaries directly with .}$+.: ln@Sa@ng increases ization threshold voltage (typically 1.65 reduces .s<?~**!! signal applied an~tRy:ac current driven through transmit receive gains loop currents greater telephons lin8N$?he closed loop-gain from than threshold (short loops) attenuating signals microphone t~,&&,JXO terminal should greater ring. reduces sidetone level which than prevgpb{r~smit amplifier oscillations. would otherwise increase when switched into .3:.yj?J ~;:t. circuit. voltage terminal given Note: Adjus#&3Rts'to transmit level gain com- *:.>\> q~!s~ addition receiver sidetone curwhere loop current r~nt$o' transmit amplifier output current dummy load current (6.0 speech ,~y}$~ormally sidetone current from renetwork current (4.0 mA). `~ce;verwill increase transmit signal curfi~,., .\,,, Thus resistor selected activate equaliza$f~?~rent receiver phase with that RIO). *~,1. Thus transmit gain sidetone levels cantion circuit desired loop current. However, must selected keeping mind fact that also adjusted independently. controls resistance telephone. Capacitors Receiver Gain prevent current flow into Feedback resistor adjusts gain receiver terminals, This reduces clicks also prevents amplifier. Increasing increases receiver amplifier changes characteristic telephone when gain. terminals switched impedance.
MOTOROLA
Semiconductor Products !nc.
FIGURE MC34010A
ELECTRONIC TELEPHONE APPLICATION
CIRCUIT
Piezo Sound Element DTMF Row-Column Switch Closure controlled hook switch; Illustrated "on-hook' condition.
MC6800
SVstem
,P133 C12+
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,!.,.
"Data`"'~'I
:?,,
with 2-{erminal
,,,,
FIGURE MC34011A ELEC~RO#C TELEPHONE APPLICATION CIRCUIT Piezo Sound Element DTMF Row-Column Switch Closure
controiled~$ hook switch; lllu=~F "on-h{
`i'2'""N2c4Mc340113m-"J
Rio26
lCIOV
C19>
RING
C18>
MOTOROLA
2-~erminal mike onlv.
Semiconductor Products Inc.
EXTERNAL COMPONENTS
(Component Nominal Value
pF,-3.O 0.05 0.05 0,01 0.01 l.op~lov Non-polarized Ceramic Resonator oscillator capacitors. Transmit hmiter low-pass filter capacitor: controls attack decay time transmit peak limiter.,., "~:~il, *$,J:<t:tx ,,.++$:+. Transmit amplifier input capacitors: prevent current flow into attenuate low;$~:$py noise microphone lead. ~t:,? `i::,.>.3:* i,:t.>.$t. Sidetone network capacitor: provides phase-shift sidetone path match that caus@~lephone 7.:, ,,.\.\.b-.:J.,i\. .,,. line reactance. ::$\~ !,<$.": ,.{< Receiver amplifier input capacitors: prevent current flow into terminal atteme~low frequency ~J$,~*t\, ,,.:> :I:f,. ,<,T !~ii`.tr noise telephone line. k.~,~ regulator capacitor: frequency compensates regulator preve~&oscwfion. receiy~{,$wer prevent oscillation. Receiver amplifier output capacitor: frequency compensates
Labels Referenced Figures
Capacitors
Description
load filter capacitor: prevents load circuit from attenuat@~&s~hals .-,.$:' \*$' terminates telephone line fQr.~.&equency signals prevents .I?!.t.? .$fa,:~:;.} ~i,. `{:* Tone ringer oscillator capacitor: determines clock freque~$~r,:$. tone warble frequency synthesizers. \:,.>\,,+:.>~,, DTMF output feedback capacitoc couples feedba@W~ DTMF output amplifier which reduces ~$', output impedance. .,.y `?$J>,.A Telephone line bypass capacitor oscillation regulator. Tone ringer input capacitor: filters rectified ~nger input signal smooth supply potential `:*, oscillator output buffer. ~.:$j:: Tone ringer filter capacitor integrates ~v~ge from current sense resistor input .t,:~"~`.,,!:.:, ><*, threshold detector. :i,<\ Tone ringer line capacito~ acco~wstone ringer telephone line; partially controls onhook input impedance telephoflx~'$> Speech equalization Sidetone equalization coupl~ng c~aci;or. Prevents current flow into terminal. (optional) (optional)
Resistors
Nominal Value
1.8k ,,:.,
,,~y.t),\/): :~,'$.
"+.,it.,a ,<;$ *:.:,,*>. .,:x:
~.).~
@*~ng capacitor. Prevents current flow into terminal. :~\N),*. -\,*.+;e,i/.e,\.,$.
Description
telephone line
esistor: limits current into tone ringer from transients r&ts on-hook impedance telephone.
current sense resistor produces voltage input threshold detector proportion ringer input current. ringer oscillator resistor: determines clock frequency tone warble frequency synthesizers. resistor: conducts line current excess current required speech dialing controls theoff-hook dcresistance telephone. Receiver amplifier input resistors: couple input signals from telephone line receiver amplifier; signal subtracts from that R9to reduce sidetone receiver. Receiver amplifier feedback resistor: controls gain receiver amplifier. Sidetone network resistors: drive receiver amplifier input with inverted output signal from transmitter; phase signal should opposite that Transmit amplifier load resistor: converts output voltage transmit amplifier telephone line; controls maximum transmit level. Transmit amplifier feedback resistor: controls gain transmit amplifier. Transmit amplifier input resistors: couple signal from microphone transmit amplifier; control dynamic range transmit peak limiter. DTMF calibration resistor: controls output amplitude DTMF dialer. into current that drives
lqQ'g.)8Q* .,$t,?~"
;$~ho ::::% ~>\:j'~5k, .,::,, .:,: 31*":: "'N*'$ L{t: ,.\\,,,-?,,.,li %12, .314
Sidetone network resistor (optional): reduces phase shifi sidetone network high frequencies. Speech equalization resistor. Reduces transmit receive gain when EVterminal Sidetone equalization switches (optional)
resistor. Reduces sidetone level when terminal switches (optional) electret microphone;
Microphone bias resistor: sources current from power 2-terminal used with 3-terminal microphones.
MOrOROLA
Semiconductor Products Inc.
.1A,
EXTERNAL
COMPONENTS Semiconductors
(continued) Electret Terminal, Primo EM-95 (Use equivalent Receiver Primo Model DH-34 (300 equivalent
MDAIOIA, equivalent, N4005
2N4126 equivalent 18V, 1.5W, IN5931A 1N5936A
1N750 muRata Erie
Resonator, equivalent
Terminal, Primo 07A181P (Remove equivalent
`!(:,,:+ts., ~?bs ,,~k~> ,,t.:, .:{:\&+ :.*.,.\\\%l ,>,.,.* .,,:.$$ ?$'~,, .:,!> ~:*s.?+,, >~.$.\.~
*'X,l, $J,$<,. ,,.,'~ ,'$:.
Piezo 5030BC Toko Buzzer
equivalent
OUTLINE
DIMENSION
NOKS:
DIMENSIONS INCLUDE MOLD FLASH. DIMENSIONINGANO TOLERANCINGPERANSI Y14,5M, 1982. CONTROLLINGDIMENSION: INCH
44-PIN PLCC CASE 777-01
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Motorola reserves right make changes without further notice products herein improve reliability, function design, Motorola does assume liability arising application product circuit described herein; neither does convey license under patent rights rights others. Motorola @are registered trademark Motorola, Inc. Motorola, Inc. Equal Employment Opportunity/ Affirmative Action Emolover,
MOTOROLA
,6574-3 PR,mm Wm,w ,.mo ,30!7,
`Semiconductor Products Inc.
20912.
,5>000
PHOENIX,
ARIZONA
85036
SUBSIDIARY
MOTOROLA
INC.
m174,R,

ELECTRONIC TELEPHONE CIRCUIT Provides Basic Telephone Station App

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