參數(shù)資料
型號(hào)： TEA7092TQ
廠商： 意法半導(dǎo)體
英文描述： TELEPHONE ANALOG FRONT END
中文描述： 電話模擬前端
文件頁(yè)數(shù)： 3/57頁(yè)
文件大?。?/td> 574K
代理商： TEA7092TQ
I - TEA7092 GENERALINFORMATION
I.1 - Setting the TEA7092 Application
TEA7092 is a telephone set integrated circuit de-
signed to meet variouscountry’s requirements.
TEA7092 is adapted to each country through ex-
ternal componentvalue modifications.
TEA7092 performs the following features :
- Speech (Line interface & 2 wires / 4 wires)
- Call progress monitor (Exchange tone heard in
the loudpeaker& On-Hook dialing)
- Group listening (Handset & loudspeaker used
simultaneously)
- Handfree interface
- Ring on Loudspeaker
- DTMFdialing
- DC mask in Pulse dialing mode (Tip & Ring
voltage reducedduring make period)
- Microcontrollerinterface
- Linecurrent variation detector for transfer
- Waitingmelodygenerator
- Beep error generator
All these featurescan be programmed by the as-
sociated microcontroller through the serial bus in-
terface.
Make a copy of the last page of this document
and keep it as a reference,when you read this
application note, if you want to refer to the
external component names.
When setting the application, it is preferable to
respect the following flow chart :
Speech Part and DTMF Dialing
- Startyourapplicationwith the defaultcomponent
values given at the last page of this document
(typical application).
- Adjust the
DC and START-UP characteristics
.
- Adjust the
Impedance
(returnloss).
- Adjust the
Transmit parameters
(softclipping
level,gain, frequencyresponse curve).
- Adjust the
Sidetonenetwork(s)
*.
- Adjustthe
Receiveparameters
(gain,frequency
response curve)*.
- Adjust the
DTMF output level
.
* Each of these two adjustments isinfluenced by the other one,for
more information, seeSections II.4& II.5.
Call Progress Monitor and Group Listening
- Adjust the
Loudspeaking amplifier
(gain, fre-
quencyresponsecurve) withouthandsetconnec-
tion in order to avoid influence of the handset
microphone.
- Adjust the
Antiacoustic feedback efficiency
.
RingerPart
- Choosethe
Ring frequency melody
.
- Adjust the
Ring start up level
.
- Optimize the
loudspeakeroutput power
.
Further Features
- Tip & Ring DC value in the make period in pulse
dialing mode,
- Line current variationdetector for transfer,
- Waitingmelody generator,
- Beeperror generator,
- Microcontrollerinterface,
are essentialysoftware programming.
Note :
Throughout the application note, I
L
is the
current which power supplies the complete appli-
cation(currentis equivalenttotheonedeliveredby
an exchange to power a telephone set). For the
entire application note,unlessotherwisespecified,
the component values are those given at the last
page of this document (typical application).
TEA7092 - TELEPHONE SET INTEGRATEDCIRCUIT
3/57
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