TELEPHONE SPEECH NETWORK TONE DIALER Linear/12L Technol

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TELEPHONE SPEECH NETWORK TONE DIALER Linear/12L Technol

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MC34013A
TELEPHONE
SPEECH NETWORK
TONE DIALER
Linear/12L Technology Provides Volt Operation Speech Dialing Modes
Both
Speech Network Provides Wire Conversion with Adjustable Sidetone Utilizing Electret Microphone DTMF Generator Uses Low-Cost Ceramlic Resonator curate Frequency Synthesis Technique On-Chip Regulator Insures Stable Operation Loop Lengths Dialer Mutes Speech Network with Suppression DTMF Release Internal with
Over Wide Range Delay Click
7q.plN
QUAD PACK CASE 776A-01
SUFFIX PLASTIC PACKAGE CASE 770-02
FIGURE FUNCIIONAt
BLOCK DIAGRAM
Hook Switch
Speech Network
"'''ne:CIMOTOROLA INC, 1985
DS965:
(Replacing ADI-792
MAXIMUM RATINGS (Voltage Referencesto Parameter
CONNECTIONS Value
+18, +2.0, -1.0
Unit
Terminal Voltaae (Pin
Terminal Terminal R1-R4 Terminal CI-C4 Operating Voltage Voltage (Pin (Pin
2.0,
Current (Pins 1-4) (Pins 5-8) Temperature Range Range -20to -65to
*loo
+150
Ambient
Storage Temperature
GENERAL CIRCUIT
MC34013A Dialer aling, provides analog
DESCRIPTION
Speech Network Tone DTMF disynthesizer
Electronic frequency
line interface circuit that terminates telephone line. When mated with MC34012 Tone Ringer, complete tone dialing telephone produced with just lCs. voltage operation necessity telephones networks where parallel telephone connections common. electronic speech network operating parallel with conventional telephone receive line voltages below volts. DTMF dialers operate similarly low-line voltages when signaling through battery powered station carrier equipment. These vol~,age:s requirements have been addressed realizid~t~,he MC34013A bipolar/12L technology with app~ri&e circuit techniques. resulting speech an}~ circuits maintain specified performance .~*$&~@stantaneous input voltage voltsf''${~" <'),:4.> <~,? ,,:,!,,,. ,,],,+i.,
amplifiers
speech transmission
dialer biq$.~,cur~nts through regulator. input voltag~sbases, conducts excess line current t&?&@b resistor R12. volt level shift preve~&~&~$#ration with telephone line signals to'~ volts peak dBm). constant current
(#~jrnm?load) switched when DTMF dialer ,,:i:~$tl~ated reduce line current transients. Figure il%. lustrates voltaae/current characteristic
Speech Network speech network (Figure provides two-tofour wire interface between telephone line instrument's transmitter receiver. electret microphone biased from drives transmit amplifier. very loud talkers, peak limiter circuit reduces transmit input level maintain distortion. transmit amplifier output signal inverted terminal driven through external network control receiver sidetone level. switched resistance terminal reduces receiver signal
FIGURE3 CHARACTERISTIC
`*'*-*
Telephone
Voltage Regulator
Speech Mode
Operable
--_;
Line Current (mA)
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Semiconductor
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GENERAL
CIRCUIT DESCRIPTION
(continued)
BLOCK DIAGRAM
FIGURE SPEECH NEWORK
Transmit Amplifier
~TXO
Sidetone Inverter
ITXO
~*)i
.U,,
`*,8.
\&.\
when dialing suppresses clicks ho~&~e~pad switch transitions. When transmitting, afi~$~$ignal currents (iTXO iRXO) flow through th~$y:~tgge regulator pass transistor drive ~[h~fibne line. This feature consequences~$$%$~$ke transmitcontribting mode receiver sidetone C~[~eq~Rxo utes total signal thq$F?~#ong with iTXO; impedance theJQ<~YX@e determined receiver impedance amth$ voltage gain from line receiver am~fier~titput.
keypad interface designed function with contact resistances leakage resistances Single tones initiated depressing keys same column. 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 0.80/0 achieved with &0.30/o ceramic resonator. column converters produce 16-step approximations sinusoidal waveforms, Feedback through terminal reduces DTMF output impedance approximately satisfy return loss specifications. (EIA RS-470)
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FIGURE DTMF DIALER BLOCK DIAGRAM
~-_--
Column Keypad Comparators Logic Encoder
~lEncOderl L"fl
Column
718191C]RA~ *lOl#lDl""-~ Keypad
-.vork
Luul
TABLE
FREQUENCY SJ@k~SIZER
ERRORS
YODeviation from Standard
0.086 -0.104 +0.141 -0.128
-0.108 0.067 +0,156 +0,061
Y:,, .,,. ~:,.
25"C)
,4::Y ,:*,,
-&\$.
,.:?,, @aW:cteristic Voltage Regu~f~&,~put Mode Change Voltage
Test Method
Symbol AIDT
Unit volts
14.5
Curr~bTMF
Chanal~T<tith
+f$~t Speech Mode @g*+:$w Vipp' Speech DTMF Mode Current Difference Level Shiti 10mA V,!LR= llOmA Terminal Resistance
AITR
AVLR
mVdc
Load Regulation
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ELECTRICAL CHARACTERISTICS
(continued)
KEYPAD INTERFACE CIRCUIT
Characteristic 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 Test Method Symbol 0.88 Unit
Km,n
k~i,,, ,:,.:.:>,, ,.,.,i.y:}$w .,., 1.12 ?.3,.]?'.* .,.! ,"~<1 "?'~" ~,:`?>IS$li .~<*f3*, #.J. >,.*,i:?"/;i ].,,i% ,l,? `.$t$:~, -'.*.: .:.' .:,. mVdc
vROC
0.70 vROC
1100
Threshold Voltage Terminal: 1,2,3,4 Column Threshold Voltage Column Terminal: 1,2,3,4
J0,30 vROC .,'.~3+ji:j/t
DTMF GENERATOR
Tone Frequency
Column Tone Frequency
Column Column Column Column 0.38 0.48 dBCR YODis 0.45 0.55 0.55 0.67 Vrms `rms
Tone AmDlitude
Column Tone Amplitude Column Tone Pre-emphasis DTMF Distortion
.,:?1
DTMF Out~ut Resistance
SPEECH NE~ORK Terminal Terminal Terminal Terminal Terminal Saturation Voltage
*.*,?,,t~, .Y,::+;ti. .t;:}~,,), :+,,. ~>:,,;a ***.," ~3J,~JJr ~.~$.,, ~i+<+: \.,#4, ,+~f~.:%$$
.*L. ""'~13
vMIC IMIC BTxO iTxi vTxO( vTxO( GSTA ISTA BRxO IRXI vRxO( vRxO( R~L(OFF) RTxL(ON) RRM(OFF) RRM(ON)
0.48 16.5 0.40 0.48
0.56 0.45 0.56
0.68 0.54 0.68
mVdc mVdc mVdc mVdc mVdc
Leakage Current Input Resistance Bias Input Bias ,.>'
Sidetone
Arn&$#~$J,~ai Current
Terfi~al @/tput ~$%alBias Rx~T~"&lnai RX@Terminal Terminal Terminal Terminal Terminal
Input Bias Current Positive Swing Negative Swing
Resistance Resistance Resistance Resistance
Terminal
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Semiconductor
Products Inc.
DESCRIPTION (See Figure external
Designation R1-R4
component
identifications.)
Function Keypad inputs Rows through When open, internal resistors pull inputs regulated (=1.1 volt) supply. normal operation, column input connected through SPST switch telephone keypad. inputs also activated Logic (<500 `~'.:t .%,,, .,~, ~$<{:,~!i), microprocessor port. .:$.,\, ,$>,,,~. Keypad inputs Columns through When open, internal resistors pull dow~l~,~,t~$rnn inputs normal operation, connecting column input produce,a%th,?t$+spective column DTMF tones. addition being connected input, colue~$kfi~ts `?wt,t:ip ,),.~ activated Logic (>500 <3.0 volt). ,~i+,,'?.; Ceramic Resonator oscillator input feedback terminals, respectively. D~F:~r intended operate with ceramic resonator from which column tone~aare:%~thesized. Automatic Gain Control low-pass filter terminal. Capacitor connecte@~&n sets attack decay time transmit limiter circuit. This capacitor $<.,~:kt! @$s@ a~d$ reducing clicks receiver hook-switch transients DTMF on/off transients. l~@.~@fiction with internal resistors, (1.0 forms timer which mutes receiver amplifier a"&q~rnately milliseconds after `,*, user goes off-hook releases DTMF Key. l.k,~ Microphone Mute. provides means ~W~+~ernicrophone transmit amplifier response digital control signal. When this co~pec~ed Logic (>2.0 microphone return path transmit amplifier output ar~]$~'d. Microphone negative supply terminal. .&rrent*rom electret microphone returned through terminal which connecte~,~o'~. collector on-chip transistor. base .~>,:, this transistor controlled either internall~:by mute signal from DTMF generator, externally ky,.st,c, -.,*. logic input ~,,;:,a} >.,~&, .$,.,,. Transmit Input Limiter. internal variabt~resistance element atthe TXLterminal controls transmitter input level prevent clipping wjth signal levels. Coupling capacitors prevent current flow through TXL. dynam$&)[ange transmit peak limiter controlled resistors !1+.,
CI-C4
10,9
Transmit Amplifier input.v~r$$, input transmit amplifier from electret microphone. coupling capacitors all~&.@~:dc offset maintained approximately above feedback through resistor ,&~,~J~. ,:~)i$ `~):. :2+\ Transmit Ampllt~N~,*ut. transmit amplifier output drives current through voltage regulator pass-transist~kTT~:~ resistor bias voltage typically volts above transmit amplifier ~:%~ntrolled R3/(Rl ratio. SideT$ti&~*~'lifier output. output sidetone inverter amplifier whose input driven by~&:%a@mit .%,:.:,>,~,\. signal TXO. inverted transmit signal from subtracts from receiver amplifier l~:t~irent from thus reducing receiver sidetone level. Since transmitted signal shifted with respeti reactive impedance phone line, signal from ~ip:~.ust similarly phase-shifted order provide adequate sidetone reduction. This phase relationship i\,L\\ `$k@$tween transmit signal sidetone cancellation signal from controlled ,.:*,,> 4;$, ,*.`"1 i,], R~,$~/$ Receiver Amplifier Mute. A'switched resistance terminal attenuates receiver amplifier *,!t,~.) ,):, input signal produced DTMF dialing tones also mutes clicks receiver which result `"*' `{!? from keypad hook switch transitions. resistance typically 5400 mute mode ,.,$$,`?(t>k> otherwise. Coupling capacitors prevent current flow through .\ky::s<,.s ,:.~ 'R*,?,' Receiver Amplifier Input. input terminal receiver amplifier which driven signals yb.,e~ `:$.: from STA. Input coupling capacitor allows biased approximately volts above .'!., feedback resistor Receiver Amplifier Output. This terminal connected open-collector output transistor receiver amplifier. bias current output device sourced through receiver from bias voltage typically 0.6volts above Capacitor from RXOto provides frequency compensation receiver amplifier.
MOTOROLA
Semiconductor
Products Inc.
DESCRIPTION
Designation
(continued)
Function Amplitude Calibration terminal DTMF dialer. Resistor from pinto controls DTMF output signal level Ring. Voltage Regulator output terminal. output volt voltage regulator which supplies power speech network amplifiers DTMF generator during signaling. improve regulator efficient'@, line current conditions, external pass-transistor used regulator circuit. Ca~a~#~,\j, ~.*, ,.~t\:"~" frequency compensates regulator prevent oscillation. \t.3+ .,.,,. common (more negative input) connected Ring through polarity ~,~$idge.
line voltages
(<3.0 volts), current flows through
~,,., `:;.!,
Base Pass-transistor. Under long-loop conditions where li~l~$?~$es would cause fall below volts, drives transistor into saturation, the~$~ rn~fiimizing voltage drop across pass transistor. line voltages which maintain above'$k~fs, biases linear region thereby regulating voltage. Transistor also co~-~e speech signals from transmit amplifier Ring ,~,; .?::., .:X* .,+7 -,t.+,i<.~,.,iy. more positive input regulator, speech, DT~,~,~ns connected Ring through polarity guard diode bridge. ~:f;,:,& ,\.\:',. ,.,.:~,, Load Capacitor. Capacitor from ,,for~$~a low-pass filter which prevents resistor ".:+.;, from loading speech DTMF signals. ,,i$f:,
.,!.
Feed Back terminal DTMF output. Capaci@r?@~3'$o nnected from provides feedback reduce output impedance ~:~>n tone dialing. \\$, k,.;,<, ``.i?,t, FIGURE
TXAC
Notes: *Selected ceramic resonator: kHz. Capacitances unless noted. resistances ohms,
0.01
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FIGURE TEST
FIGURE TEST
General Test Circuit
Measure Measure Measure
with with with
FIGURE TEST FOUR
General Test Circuit
`?,, .k,.~:.t ,.,~
%~FkI open measure lT~. calCUlate:
ITR. Close again measure
Measure
VLR.
Calculate AVLR
AITR
Closed
Open
Repeat Test with
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FIGURE TEST FIVE
FIGURE TEST
General Test Circuit
With open measure VLC. Close measure ILC. Calculate:
Calculate:
FIGURE TEST EIGHT
General Test Circuit
I.ov
Subscript corresponds column number.
<.>.,:.(+,i!, ;.,,,
`~SI (*oC).
Terminal
measure voltage Terminal measure
Terminal I.OV
measure
ICI. Calculate:
Terminal
IR1. Calculate:
b,c,d. Repeat Test 2,3,4.
VROC c,d,e. Repeat Test 2,3,4.
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FIGURE TEST NINE
FIGURE TEST
General Test Circuit
corresponds b,c,d.
number.
Terminal with Vdc. Verify VMIC (VMIC <0.3 Vdc). Decrease 0.70 VROC verify VMIC switches high. (VMIC >0.5 Vdc). VROC obtained from Test Repeat Test rows 2,3, 2,3,4)
`"'" `-,,*, .:., ~<r<' ~\/. St.t~$~$@inal with Vdc, Verify VM[~I~lW (VMIC <0.3 Vdc). Increase 0.30 VROC
v~i$fi VMIC switches high, (VMIC >0.5 .,N~btained from Test :#8~q.Repeat
Vdc). VROC
Test columns 2,3, 2,3,4)
With Terminal measure frequency tone
Repeat Test rows 2,3,4). With Terminal measure frequency tone
Repeat Test columns 2,3, 2,3,4), Terminal amplitude (VROW). Measure tone column
Terminal Measure tone amplitude (VCOL).
Using results Tests 1If, calculate:
VCOL
dBCR Ioglo VROW
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FIGURE TEST WELVE
FIGURE TEST THIRTEEN
1.OV General Test Circuit
Notch Filter
@,:*vl
Single Pole
General Test Circuit
Note:
notch filters must have attenuation respetiive center frequencies. with true voltmeter. Vl(rms) V+(rms)
their
Measure
Calculate:
FIGURE TEST FOURTEEN
FIGURE TEST Fl~EEN
General Test Circuit
Measure VMIC
measure
IMIC.
measure IMM. Calculate:
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Semiconductor
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FIGURE TEST SIXTEEN
FIGURE TEST SEVENTEEN
General Test Circuit
With open, measure VTxO. Using obtained Calculate: BTxO VTxO With open, measure VTxO VTxl. Calculate: ITXI (VTxO VTxl)
Test
Close Measure VTxO. Calculate: VTxO(+ VTxO where obtained from Test Close VTXO( VTXO. Measure VTxO.
FIGURE NINETEEN
General Test Circuit
With open, measure VRXo. Using obtained calculate: BRxO VRxO With open, measure VRxO VRx[. Calculate: IRXI (VRxO VRX1)
Test
Close Measure VRxO. Using obtained Test calculate: VRxO VRxO. Close VRXO( VRxO. measure VRxO.
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FIGURE TEST WENTY
FIGURE TEST WENW-ONE
lTXL General Test Circuit
VTXL
vrm~
position with open. Measure Calculate: RTXL (OFF) ITXL. ITXL.
1.0Vrms
Measure
position close Measure voltages VTXL. Calculate: RTXL (ON) VTXL VTXL
Ring
used with 2-terminal mike only.
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APPLICATIONS
Figure specifies typical application circuit MC34013A. Complete listings external components provided this section along with nominal component values. Component values should varied optimize telephone performance parameters each application. relationships between application circuit components certain telephone parameters briefly described following: Off-Hook Resistance conducts line current excess speech dialer bias current. Increasing increases input resistance telephone line currents above should selected between W-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. DTMF Output Amplitude controls amplitude column DTMFtones. Decreasing increases level tones generated ratio column t,~e amplitudes internally fixed. should ~a~r than avoid excessive current DT~[Jwptit ,.<:. amplifier. ~'~'. "":L, ~'::\ .4.,
INFORMATION
greater than limit current transmit amplifier output. Transmit Gain ,:!$, gain from microphone telephq:~e .I},., varies directly with Increasing increa~F}~@~gnal applied current drive~.~$r,~gh telephone line. closed loo~ifrom microphone terminal sho:~f~$~$reater than prevent transmit amplifier os&W@t~?ns. ,#+~&,,"'$+)l& Note: Adjustments transmit ~ve~@nd gain complicated additio~.of+r%eiver sidetone current transmit~@@,l ifier output current Normally t~,~+tone current from receiver will incr~:~l$~% transmit signal current rw~' phase with that R4). Thus the,,~an%it gain sidetone levels cannot &~&g&ed independently. \<.,, ,\i~.! ",+,,,,. .t.J,l.<:~
>,.+,
*;,!,,\<,+:,>\\~;
Receiv@+$@'fn ~$dba~ resistor adjusts gain receiver ~L~f~@r. ,f:,~:;$ Increasing increases receiver amplifier
Sidetone Level Sidetone reduction achieved cancellation receiver amplifier input signals from determine phase sidetone balance. voltaae iunction should 180°
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EXTERNAL
(Component Labels
COMPONENTS
Referenced Figure
Capacitors
Nominal Value 0.05 0.05 0.01 0.01 Ceramic Resonator oscillator capacitors.
Description ,*!. `*{,3, "~.~wf$ .,,. Transmit amplifier input capacitors: prevent current flow into attenuate 10w:fffqu~:& ,ts~. .~.)>. .(.,'?s': noise microphone lead. ,$.}).,,.,&-\ Sidetone network capacitor: provides phase-shift sidetone path match that caused$~$e>phone ,,+~ ,.,,<,, .,:,! line reactance. .".! ,1;+ Receiver amplifier input capacitors: prevent current flow into terminal atte%~w~ow frequency $~:$,{>, noise telephone line. .Sj>.,:+$ `:~'> regulator capacitor: frequency compensates regulator prev~:~cillatlon. 4%8:*4 Receiver amplifier output capacitor: frequency compensates receiv.@;%ll~ter prevent oscillation. ,.,,~. `"C* load filter capacitor: prevents load circuit from attenuati~ ~nals ,<>, Telephone line bypass capacitor: terminates telephone line for4$@~t/&quency signals prevents oscillation regulator. ,i~,: DTMF output feedback capacitor: couples feedback aro&#$@ DTMF output amplifier which reduces ,$*$*."L:,% .-.'. .~,c\-:. output impedance. .:<>., ,.?*. i:.,,,.,. .,.,$' 1>,. *.}, ,,1::: limiter low-pass filter capacitor: controls attack decay time transmit peak limiter. Acription required speech dialing
Transmit
Resistors
Nominal Value 150k,56k 1.5k,30k
load resistor: conducts linai~e~] excess current circuits; controls off-hook re~x telephone.
Receiver amplifier input resistors: cou'p?k input signals from telephone line receiver amplifier; signal subtracts from t,wt in~7 reduce sidetone receiver. ~$:.j;,. Receiver amplifier feedb~ ~jstor: controls gain receiver amplifier. Sidetone network resi*$~[i~e receiver amplifier input with inverted output signal from transmitter; phase si~$i~7 should opposite that Transmit amplifi@~&@#esistor: converts output voltage transmit amplifier into current that drives telephon~m~ntrols maximum transmit level. t~i!:$ :.', .,~.~ Transmit~j~P feedback resistor: controls gain transmit amplifier. Tran$~%%er input resistors: couple signal from microphone transmit amplifier; control dynamic ra-"~.~e transmit peak limiter. &~M~calibration resistor: controls output amplitude DTMF dialer. ?,$,,'i*l+>,:& &'~ophone bias resistor: sources current from power 2-terminal electret microphone;
SeWbuctors
Electret Terminal, Primo equivalent Terminal, Primo equivalent EM-95 (Use A181P (Remove Primo Model
Receiver DH-34 (300 equivalent
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OUTLINE
DIMENSION
SUFFIX PLASTIC PACKAGE CASE 710-02
PLANE
MILLIMETERS
12,32 12.32 2.16 0.33 0.66 0.13 ?,37 11,43 11.43 1.07 1,07 1.07 0.00 2.34 12,57 12,57 4.57 1.01 2.79 0,53 0.81 0.38 8.38 12.57 12.57 1.21 1,21 1.42 0.50 2.71
INCHES
0.485 0.485 0.165 0,025 0.085 0.013 0.026 0.005 0.290 0.450 0.450 0.042 0,042 0.042 0.000 0.088 0.495 0.495 0.180 0.040 0,110 0.021 0.032 0.015 0,330 0.456 0.456 0.048 0.04s 0.056 0,020 0.107
1.27
0,050
NOTES: DIMENSIONS INCLUDE MOLD FLASH. DIMENSIONING TOLERANCING ANSI Y14.5M,1982, CONTROLLING DIMENSION: INCH
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 registered trademarks Motorola, Inc. Motorola, Inc. Equal Employment Opportunity/ Affirmative Action Employer.
M070ROLA
Semiconductor
20912
Products Inc.
ARIZONA 85036
PHOENIX,
SUBSIDIARY
MOTOROLA
INC.

TELEPHONE SPEECH NETWORK TONE DIALER Linear/12L Technol

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