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TEA7092TQT Datasheet(PDF) 3 Page - STMicroelectronics |
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TEA7092TQT Datasheet(HTML) 3 Page - STMicroelectronics |
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3 / 24 page  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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