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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7407 датащи(PDF) 20 Page - STMicroelectronics |
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TDA7407 датащи(HTML) 20 Page - STMicroelectronics |
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20 / 30 page  AF Search Control The TDA7407 is supplied with several functional- ity to support AF-checks using the stereodecoder. As mentioned already before the highohmic-mute feature avoids any clicks during the jump condi- tion. It is possible a the same time to evaluate the noise- and multipath-content of the alternate fre- quency by using the Quality detector output. Therefore the multipath-detector is switched auto- matically to a small time-constant. One additional pin (AFS) is implemented in order to separate the audioprocessor-mute and stereodecoder AF-functions. In Figure 22 the blockdiagram and control-functions of the com- plete AFS-functionality is shown (please note that the pins AFS and SM are active low as well as all control-bits indicated by an overbar). TEST MODE During the test mode, which can be activated by setting bit D0 of the testing byte and bit D5 of the subaddress byte to "1", several internal signals are available at the CASSR pin. During this mode the input resistor of 100kOhm is disconnected from the pin. The internal signals available are shown in the software specification. Figure 22. Mute Control Logic TDA7407 20/30 |
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