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TEA1111A Datasheet(PDF) 10 Page - NXP Semiconductors |
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TEA1111A Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 24 page  1999 Nov 22 10 Philips Semiconductors Product specification Speech circuit with dialler interface, regulated supply and earpiece volume control TEA1111A Sidetone suppression The TEA1111A anti-sidetone network comprising RCC // Zline,Rast1,Rast2,Rast3,RSLPE and Zbal (see Fig.10) suppresses the transmitted signal in the earpiece. Maximum compensation is obtained when the following conditions are fulfilled: The scale factor k is chosen to meet the compatibility with a standard capacitor from the E6 or E12 range for Zbal. In practice, Zline varies considerably with the line type and the line length. Therefore, the value of Zbal should be for an average line length, which gives satisfactory sidetone suppression with short and long lines. The suppression also depends on the accuracy of the match between Zbal and the impedance of the average line. The anti-sidetone network for the TEA1111A attenuates the receive signal from the line by 32 dB before it enters the receive stage. The attenuation is almost constant over the whole audio frequency range. A Wheatstone bridge configuration (see Fig.11) may also be used. More information on the balancing of an anti-sidetone bridge can be obtained in our publication “Semiconductors for Wired Telecom Systems; Applications Handbook IC03b”. For ordering information, please contact the Philips Semiconductors sales office. R SLPE R ast1 × R CC R ast2 ( R ast3 ) + × = k R ast2 R ast3 R SLPE + () × R ast1 R SLPE × ------------------------------------------------------------ = Z bal kZ line × = handbook, full pagewidth MBE787 Im Zir IR Rast1 Rast3 Rast2 SLPE RSLPE VEE Zline RCC LN Zbal Fig.10 Equivalent circuit of TEA1111A anti-sidetone bridge. |
Número de pieza similar - TEA1111A |
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Descripción similar - TEA1111A |
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