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參數(shù)資料
| 型號： | ST3917BN |
| 廠商： | 意法半導體 |
| 英文描述： | SPEECH - TONE/PULSE DIALER - LED INDICATOR |
| 中文描述： | 語音-音頻/脈沖撥號- LED指示燈 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 181K |
| 代理商： | ST3917BN |
ST3917A
ST3917B
SPEECH - TONE/PULSE DIALER - LED INDICATOR
.
2 TO4 WIRES CONVERSION
.
PRESENTTHEPROPERDCPATHFOR THELINE
CURRENT AND THE FLEXIBILITY TO ADJUST IT
ANDALLOWPARALLELPHONEOPERATION
.
SYMMETRICAL HIGH IMPEDANCE
PHONE INPUTS SUITABLE FOR DYNAMIC,
ELECTRETORPIEZOELECTRICTRANSDUCER
.
ASYMMETRICAL EARPHONE OUTPUT SUIT-
ABLEFOR DYNAMIC TRANSDUCER
.
LINE LOSS COMPENSATION FIXED INTER-
NALLYBY A.G.C.
.
INTERNAL MUTING TO DISABLE SPEECH
DURING DIALING AND EXTERNAL MUTING
TO DISABLE TRANSMIT AMPLIFIER DURING
CONVERSATION MODE
.
LEDINDICATOR EITHER FOR KEYBOARDILLU-
MINATION (OR ON-LINE INDICATION) DURING
DIALING AND CONVERSATION OR FOR TONE
MODEINDICATION, THROUGH MU/MFI PIN
.
STORE UP TO 32 DIGITS FOR LAST NUMBER
REDIAL BUFFER, LNR IS INHIBITED IF THERE
AREMORE THAN 32DIGITSSTORED
.
ALLOWMIXEDMODEDIALINGIN PULSEMODE
.
PACIFIER TONE PROVIDES AUDIBLE INDI-
CATION OF VALID KEY PRESSEDIN A BUZZ-
ER OR/AND IN THEEARPHONE
.
TIMED PABX PAUSE/ 10PPS PULSE RATE
.
MAKE/BREAK RATIO : 40/60 (ST3917A) AND
33/67 (ST3917B)
.
4 SELECTABLE OPTIONS ON FLASH DURA-
TION AND SOFTSWITCH INHIBITION IN ONE
OF THE OPTION WITH 100ms FLASH TIMING
.
2 SELECTABLE OPTIONS : TRANSMIT MUTE
TOGETHERWITH LED FORKEYBOARDILLUMI-
NATIONORLEDFOR TONEMODE INDICATION
.
CONTINUOUS TONE FOR EACH DIGIT UNTIL
KEYRELEASE
.
USES INEXPENSIVE 3.579545MHz CERAMIC
RESONATOR
.
POWERED FROM TELEPHONE LINE, LOW
OPERATINGVOLTAGEFOR LONG LOOP AP-
PLICATION
July 1996
SPEECH CIRCUIT
MICRO-
DIALER CIRCUIT
DESCRIPTION
Thedeviceconsistsof thespeechandthedialerfunc-
tions.ItprovidestheDClineinterfacecircuit thattermi-
nates the telephoneline, analog amplifier for speech
transmission and necessary signals for either DTMF
and pulse dialing. When mated with a tone ringer, a
completetelephonecanbeproducedwithjusttwoICs.
TheDClineinterfacecircuitdevelopsitsownlinevoltage
acrossthedeviceanditisadjustablebyexternalresistor
to suit different country’s specification. A built-in LED
driver can deliver excess line currentto external LED
indicator(s) during dialing and speech mode. The
LED(s) can be used either for keyboard illumination
purposeor fortonemodeindication during softswitch
andmixedmodedialingby connectingMU/MFI pin to
VDDandGNDoranyrowrespectively.TheLEDcurrent
islimitedto17mA(typical).
Thespeechnetworkprovidesthetwotofourwiresinter-
face,electronicswitchingbetweendialingandspeechand
automaticgaincontrolontransmitandreceive.
Thedialingnetworkbuffersupto32digitsintotheLND
memorythatcanbelaterredialedwithasinglekeyinput.
Users can store all 13 signalling keys and access
severaluniquefunctionswith singlekeyentries.These
functionsinclude:Pause,LastNumberDialled (LND),
SoftswitchandFlash.(seeFigure1).
TheFLASHkeysimulatesahookflashtotransfercalls
or to activate other special features provided by the
PABXor central office.
ThePAUSE key stores a timed pausein the number
sequence.Redialis then delayeduntil anoutsideline
canbeaccessedor someotheractivitiesoccur before
normal signalling resumes. A LND key automatically
redialsthelast numberdialed.
AdedicatedpinMU/MFIisusedtoselectthemutingfor
transmit amplifier and lighted dial LED for keyboard
illuminationoraLEDindicatorfortonemodeindication.
The SEL pin allows selection of any one of the four
possibleFlashdurationoptions.
DIP28
(Plastic Package)
ORDER CODES :
ST3917AN - ST3917BN
SO28
(Plastic Package)
ORDER CODES :
ST3917AD - ST3917BD
1/16
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| ST394-8R | 制造商:Glenair Inc 功能描述:COVER - Bulk |
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