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UBA1707TS Datasheet(PDF) 12 Page - NXP Semiconductors |
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UBA1707TS Datasheet(HTML) 12 Page - NXP Semiconductors |
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12 / 36 page  1999 Feb 17 12 Philips Semiconductors Product specification Cordless telephone, answering machine line interface UBA1707 Fig.9 Receive amplifier. handbook, full pagewidth MGK711 VI V I RXM 2Vd 2Vd from AGC RXI RXO UBA1707 Bit names are given in italics. SIDETONE SUPPRESSION The UBA1707 anti-sidetone network comprising ZSET//Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see Fig.10) suppresses the transmitted signal in the received signal. Maximum compensation is obtained when the following conditions are fulfilled: RSLPE × Rast1 =ZSET × (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. k R ast2 R ast3 R SLPE + () × () R ast1 R SLPE × () -------------------------------------------------------------------- = Therefore, the value chosen for 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 UBA1707 (see Fig.18) attenuates the receiving signal from the line by 38 dB before it enters the receiving amplifier. 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 “Applications Handbook for Wired Telecom Systems, IC03b”. handbook, full pagewidth MGL216 Im ZRXI RXI Rast1 Rast3 Rast2 SLPE RSLPE GND Zline ZSET LN Zbal Fig.10 Equivalent circuit of UBA1707 anti-sidetone bridge. |
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