PBD3535 STMICROELECTRONICS | Alldatasheet
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ee aOOOeeeeeeeeeeeeeEeEEEEeeEw S$ G S-THOMSON O?E D I 2792923? OO13441 3 I os SS 81C 19612 D 75-27-09 mee ] ‘ ADVANCE DATA DTMF GENERATOR : © OPERATES WITH A STANDARD CRYSTAL @ INTERNAL PROTECTION OF ALL INPUTS. AT 3.58MHz, © (7L_ PROCESS ENSURES GOOD PARA- @ WIDE OPERATING LINE VOLTAGE AND METER TOLERANCES CURRENT RANGE PBD3535 i lithic i d DTME is a monolithic integrate © LEVELS FROM THE HIGH ANDLOW FRE. OSE intanel or usin tlophone st SEPARATELY parallel with an electronic speech circuit. The OC characteristic to the line is set by the speech © NO INDIVIDUAL LEVEL ADJUSTMENT IS circuit. PBD3535 gives a mute signal when NECESSARY FOR EVERY CIRCUIT sending. The circuit fulfils the CEPT specifica- © THE SIGNAL LEVELS ARE STABILIZED tion, Optional signal levels can be set by resistors. AGAINST VARIATIONS IN TEMPERATURE The circuit operates with a single contact matrix ‘AND LINE VOLTAGE keyboard, Interfacing with a computer is also © SHORT START-UP TIME. possible. © ALL TONES CAN BE GENERATED SEPAR- = ATELY FOR TESTING . ee © EXTERNAL COMPONENTS ARE MINI- - DIP-16 Plastic MIZED Fats (0.4) © EASY PC BOARD LAYOUT; ALL KEY- BOARD CONNECTIONS ON ONE SIDE OF ORDERING NUMBER: PBD 3535 THE CHIP BLOCK DIAGRAM : . 1314 15 16 3 09099 9 o P o Ed [| [>be a ay 0000 12) fe) fe) Seesi4 910n 2 4 5 7 “This advanced Information on & new product naw in development or Undergoing evaluation, Details are subject to change without notice. 589 6/86 O715 B-08
2 aEEEEeEeEeEeEeEeEeEeEeEeEeEeEeEeEeEeEeEeEyEyEyUu7EuEr—EeEeEeEeEeEee __s S-THonson ove p Mf raec237 oonauye 5 I rere a “2 -3§ gic 19613. DT- 75-a1-07 j AS “hE 3 4 Spy. PBD3535 = ; i CONNECTION DIAGRAM | Q 16] . Amat osc. 2 sf ROW LOW i FREQUENCY SIONAL LeveL(L)[] 3 vl] INPUTS sioat vevet cH) (4 of) tow ass ntrer [] 5 xl] MUTE Je 1 | conumns Hick FREQUENCY LINE (GND) (7 of} INPUTS: LINE) fle sf] s-ost8 ABSOLUTE MAXIMUM RATINGS (Maximum ratings over operating free-air temperature range (unless otherwise stated) Ve Max continuous line voltage 15 v Vo Peak line voltage pulse time = 2s 20 v pulse time = 20 ms 22 v T Junction temperature 150 °c Thm Operating ambient temperature -20 to 70 °c . Tota Storage temperature -55 to 150 °c RECOMMENDED OPERATING CONDITIONS a ee ve tmwine Cl | Fie Antares || THERMAL DATA . Rnyamp Thermal resistance junction-ambient max 80 °c Fig. 1 - Min DC level at 1.3V AC signal aay REAL Umit 3¥ 0714 8-09 590
Ee eEEE—EEEEE—EOEOEOeeww S$ G S-THOMSON O?E D | 792923? OO13443 2 i. B10 19614 DTH -an-} BPR ee | A (o> PBD3535 | a ELECTRICAL CHARACTERISTICS (Electrical characteristics over recommended operating conditions) ee Ve Line voltage Tone generation DC level 43 v at 1.3 Vp AC signal Voe ‘DC voltage below At tone generation v AC voltage At tone generation v 68°C +48°C Ve Line voltage Stand-by DC level at 43 v
2.0 Vp AC signal
L Line current Stand-by: no key pressed ViL=43V TL Line current Operating current mA ViL=43v [ieee wermeniowms ae [| om Key circuit closed Key open (16 contects) t Frequency Low fose = 3.8795MHz 7 £9 e97Hz +032 | +41 12 = 770H2 +002 | +1 9 = 852Hz +003 | +1 f= 941Hz -0.11 +H Frequency High fg = 1209H2 -0.03 | +1 fe = 1336Hz -0.03 | +1 7 = 1477H2 -068 | + fg = 1633Hz 036 | #1 Va Signal Level High Ry =47.5KO -7 | dam Vo Signal Level Low R= 698kKQ. -9 | dem Va Ry = 33. 2Ka “8 “6 dem Ve AL = 487K “10 -8 48m Vi Ry = 26.1K0 6 -4 d8m ve RL =392Ka -8 “6 dem YL Radio signa! level Vu High Freq./Low Freq. es a D Total harmonic Normal operation dBm distortion Stand-by dBm . 300-3400H2 -33 | dam 3.4-50KHz -33/-80 | dBm > 50KHz ts Start-up time Output level within 148 from final level * Si i - a Single tone distortion i less than (-33 -12 x log —355—) dBm 591 o715 8-10
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_. S$ G S-THOMSON O?E D | aqe29ea? OOLa444 4 I ‘ Wee Poe "]B1C 19615 — D T-15-Q1-0F : SAS pppa53s © AS E : TEST CIRCUIT RL n . c ‘ ry yy} = os0Mne RL=3000 SEE cb _| WY | | 'w cz fu Ame rl} [Jeu 1 es] [as 33nF Ka Las 9= 1633H2 13- ose 10 = 1477Hz 14= 852Hz < is 1336Hz 18= 770Hz 12 = 1209Hz 16= 697Hz XTAL = 3.5795MHz FUNCTIONAL DESCRIPTION Two tones are generated by connecting one input Component function: from the high-frequency group and one input Ri: Protecting rest aN ‘1: Protecting resistor; from the low-frequency group. Als Signal level low); If two or more keys ate pressed, no tones other Rn: Signal level (high); than the basic eight are generated, Ci: Low pass filter; All tones can be generated separately. When Cz: Radio frequency suppression (if used testing a circuit by connecting one input from together with speech circuit with radio the high-frequency group to one input in the suppression built in, like PBL 3726, C2 : low-frequency group plus shorting pin 3 or pin 4 is not necessary. to the ground pin 7, one single tone is generated {low and high frequency, respectively). Fig. 2- DC characteristics with speech circuit _ The absolute signal level can be adjusted with PBLS726/6 R, and Ry, but there is no need for individual ’ adjustment on every circuit. The signal level is oF stabilized against variations in temperature and * line current. , : Pause time and signal time are determined ex- a ternally from the keyboard. : Ca Allowed leakage in keyboard 1MQ. Typical threshold is 100KQ. The circuit is made to work properly with elec- 8 ook tronic speech circuits such as PBL 3726, tee ae
0716 B-11 592
EE OeVVvVOee.mrereonwneoeo SG S-THOMSON OVE D | vases? ooayes ofl g1C 19616 D T-\\6-arO Ff 4 Ve i . a N PBD3535.) (astro AO } To find suitable resistor values for Ry and Ru low frequency levels, in dBm, to get the desired tone levels the following for- Vis : mula can be used for a preliminary calculation. Ry = 56.2x R, f= 1.4KH2) x 107 so . Please note that in Ruoap (f = 1.4KHz) and 4 *Rroao | 2) x 10°30 Rioan (f = Boo) both the impedance of ve the line and the impedance of the speech circuit = = — —b_ are included. V,, and V, are the desired high and R. = 65.6 x Rioan (f = 800Hz) x 10” 59 Fig, 3- Tone level vs. line current ‘as (TTT TTT TTT TTT | a ectnrrel | TT | |g we LTTE TT pe FFEEFEEFEE-EEH q va Ry | . LPT P ry rer ew LLP Tt rr ra ae eT) Fig. 4 - Tone level vs. temperature . tere ann Panne (tty ty LT WF ls ot LELETE TTT TTT TTT Ty j LET Towser | bbe TTI 8 : bel er |F “2 tee tt LTT TT TTT ret yt yyy LT TET TT TT TTT Titty The current consumption within PBD 3535 can Fig. 5. be reduced with a resistor connected in parallel s with C1 (see fig. 5). If the current reduction is rin: ins made too large, the output signal can be dis- torted by clipping. In applications where a DTMF generator directly 0.3103 wa. “ powered from the telephone line is wanted (the r generator is not working in parallel with any kind of speech network), PBD3535 can be used sane with a DC regulator as described in fig. 7. 593 0717 e-12
i EEEEOEOEOEeEeEeEeEeEeEeEeEe 8 G S- THOMSON OPE D i 7929237? GOL44b & | F SS Sy PBD3535 j es Fig. 6 - Typical application Fig. 8 - DC series regulator ——owme am - Ea ; _ : |_| [Jeon - oe 3) [fe [ota] ° [Jun KS atpe » Gfefete] norection — 1 o-une [elo [ao] ° ReautaToR . nected to the positive voltage and one input of These schematics give a DC regulator for the the high group (pins 9-12) is connected to the range 16-100mA with an output impedance negative voltage. When an input of the high that is a compromise between 6002 and 9002 in group (pins 9-12) is connected to the negative parallel with 30nF. The zener diode is used to voltage, PBD is activated and the mute output — ensure a fast start-up time. is put in high state, . Fig. 7 - DC regulator Fig. 9 - Microcomputer interface Osune O sume * [9/ fam sv D Y cy ar es Se mr ey OC-REGUIATOR ssn [| ro For telephone systems with voltage supply instead of current supply) for the telephone line O-ume and where the telephone set is supposed to work vane as a current source, PBD 3535 can be connected with a series regulator as shown in fig. 8, Ro, Rio, Rar and Riz These schematics are working in the area 5-36V The resistors have two functions: and othe output impedance is matched against = _ When at low input level, ensure that the " input does not get below +0.2V. This must z PBD 3636 can also be controlled by @ micro- not occur. processor (see fig. 8), The negative branch of | ~— When the input level is high, limit the current. the microprocessor voltage supply is connect- Too high current will interfere with the func- ed to pin 7 of PBD 3535 and the inputs (8) are tions of the other three inputs (the resistors . connected with resistors. For tone-generating can be exchanged with diodes directly away one input of the low group (pins 13-16) is con- from PBD 3535). a
0718 B-13 5a4 :
EE EE SEeSVOEO—_eeeeVO s G s-THomson ove > Wf zaea237 conayy? 4 —— i sic assis oT nave Kee \\ iN Khe Pebas35 | a Fig. 10- High-frequency group resistors to microcomputer ' 1 ase28a — 5 i :Q en | oneor 81 O+— : roan UE : MICRO- { H PROCESSOR j-~-K-— Hi H | GQ H i | O PB03535 | i sped cc Soe Example: The logic states very from OV to+3V. Example: The logic states vary from OV to +3V. Suitable resistor value is 68K (see fig. 11). Suitable resistor value is 27K (see fig. 11). : In some telephone instrument designs a click Ras, Ria, Ras and Rig can be heard in the receiver when a button is The two functions of the resistors are: pressed down for tone signalling. In some app- lications this has been found desirable as a — To raise the OFF/ON Voltage feedback but in others the effect is not so = To limit the current when the input levels desirable. are high Fig. 11 -Low-frequency group resistors to microcomputer tt 1 1 \\ ! ! 1 [Peoass micro- i Processor | one oe 'st
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} | © H H i H . ag i nn OO sae To suppress the click effect an RC network as tone generator, Besides full and independent : seen in fig. 12 can be applied. A capacitor of programmability of both sending and receiving : 47nF halves the loudness of the click and @.ca- gains when muted the speech circuit reduces its : pacitor of 1.7uF totally cancels the click effect Consumption by about 10mA {available to the (see fig. 13). DTMF circuit), still providing the proper DC and The LS588 speech circuit if specifically develo. AC (600chm) impedance to the line. ped by SGS for use with the PBD3535 DTMF
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SG S-THOMSON O7E D | 7929237? OO=L3448 b&b | 3 oy PYo> PBD3535 | fe an ata Seat SE i he aa LSE Hy The external capacitor at pin 16 of LS688 has _to optimize the DTMF start up without affecting been reduced from the standard 104F, usually _the normal speech operation. (see fig. 14). : shown in the SGS application, down to 4.74.F + Fig. 12 - Click suppression Fig. 13- Click effect in relative sound pressure “cuicn ervecr ROM aka a p30 3595 Faun “ ry san re er) Fig. 14 - PBD3535 application with LS588. saad j pep HEE ACEH" ; i [ [roonss 4 EE am i 4 2 : i is ‘S588 4 he wn 4 (| oe Fyre] [ia suse SS 0720 c-O1 598