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TEA1112AT датащи(PDF) 9 Page - NXP Semiconductors |
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TEA1112AT датащи(HTML) 9 Page - NXP Semiconductors |
9 / 20 page 1997 Mar 26 9 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuits with dialler interface TEA1112; TEA1112A MUTE and MMUTE levels for different modes Table 1 Required MUTE and MMUTE levels to enable the different possible modes IC TEA1112 TEA1112A Mode MUTE MMUTE MUTE MMUTE Speech L L H H DTMF dialling H X L X Microphone mute L H H L SIDETONE SUPPRESSION The TEA1112; TEA1112A 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 chosen for Zbal should 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 × = 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 TEA1112; TEA1112A (as shown in Fig.14) attenuates the receiving signal from the line by 32 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”, order number 9397 750 00811. Fig.10 Equivalent circuit of TEA1112; TEA1112A family anti-sidetone bridge. handbook, full pagewidth MBE787 Im Zir IR Rast1 Rast3 Rast2 SLPE RSLPE VEE Zline RCC LN Zbal |
Аналогичный номер детали - TEA1112AT |
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Аналогичное описание - TEA1112AT |
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