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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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UBA2050 Fiches technique(PDF) 16 Page - NXP Semiconductors |
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UBA2050 Fiches technique(HTML) 16 Page - NXP Semiconductors |
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16 / 52 page  2000 May 19 16 Philips Semiconductors Product specification One-chip telephone ICs with speech, dialler and ringer functions UBA2050(A); UBA2051(A;C) SIDETONE SUPPRESSION The anti-sidetone network for the UBA205xx, comprising RCC in parallel with Zline,Rast1,Rast2,Rast3,RSLPE and Zbal (see Fig.16), suppresses the transmitted signal in the earpiece. Maximum compensation is obtained when the following conditions are fulfilled: RSLPE × Rast1 =RCC × (Rast2 +Rast3) Zbal =k × Zline 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 chosen 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 UBA205xx attenuates the received 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.17) may also be used. More information on the balancing of an anti-sidetone bridge can be obtained in our publication “Application Handbook for Wired Telecom Systems, IC03b”. k R ast2 R ast3 R SLPE + () × R ast1 R SLPE × ----------------------------------------------------------- = handbook, full pagewidth MGT046 Im Zir IR Rast1 Rast3 Rast2 SLPE RSLPE GND Zline RCC LN Zbal Fig.16 Equivalent circuit of UBA205xx anti-sidetone bridge. |
Numéro de pièce similaire - UBA2050 |
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Description similaire - UBA2050 |
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