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TEA7092TQ Arkusz danych(PDF) 3 Page - STMicroelectronics

Numer części TEA7092TQ
Szczegółowy opis  TELEPHONE ANALOG FRONT END
Download  24 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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I - TEA7092 GENERAL INFORMATION
I.1 - Setting the TEA7092 Application
TEA7092 is a telephone set integrated circuit de-
signed to meet various country’s requirements.
TEA7092 is adapted to each country through ex-
ternal component value 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
- DTMF dialing
- DC mask in Pulse dialing mode (Tip & Ring
voltage reduced during make period)
- Microcontroller interface
- Line current variation detector for transfer
- Waiting melody generator
- Beep error generator
All these features can 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
- Start your application with the default component
values given at the last page of this document
(typical application).
- Adjust the DC and START-UP characteristics.
- Adjust the Impedance (return loss).
- Adjust the Transmit parameters (softclipping
level, gain, frequency response curve).
- Adjust the Sidetone network(s)*.
- Adjust the Receive parameters (gain, frequency
response curve)*.
- Adjust the DTMF output level.
* Each of these two adjustments is influenced by the other one, for
more information, see Sections II.4 & II.5.
Call Progress Monitor and Group Listening
- Adjust the Loudspeaking amplifier (gain, fre-
quency response curve) without handsetconnec-
tion in order to avoid influence of the handset
microphone.
- Adjust the Antiacoustic feedback efficiency.
Ringer Part
- Choose the Ring frequency melody.
- Adjust the Ring start up level.
- Optimize the loudspeaker output power.
Further Features
- Tip & Ring DC value in the make period in pulse
dialing mode,
- Line current variation detector for transfer,
- Waiting melody generator,
- Beep error generator,
- Microcontroller interface,
are essentialy software programming.
Note : Throughout the application note, IL is the
current which power supplies the complete appli-
cation (current is equivalent to the one delivered by
an exchange to power a telephone set). For the
entire application note, unless otherwise specified,
the component values are those given at the last
page of this document (typical application).
TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT
3/57


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