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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3412 датащи(PDF) 37 Page - ams AG |
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AS3412 датащи(HTML) 37 Page - ams AG |
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37 / 84 page  ams Datasheet Page 37 [v1-00] 2016-Apr-06 Document Feedback AS3412 − Detailed Description Playback Only Mode The active noise cancelling feature of the AS3412 can also be disabled with the ANC/CSDA pin. The ANC/CSDA pin has to be pulled high to enable the ANC function during startup (ANC MODE). If the pin is connected to ground, the chip enters playback only mode (PBO MODE) in which the ANC function is disabled. The operating mode of the line input mute switch, as well as the mixer input, can be defined in register PBO_MODE. The microphone amplifier shuts down automatically, but it is possible to control the operational amplifiers in this mode separately. Typically only the line input amplifiers and the headphone amplifier are enabled in the playback only mode. If this function is not desired you just need to pull the pin high through a 22kΩ resistor. Figure 49: Playback Only Mode Timing Diagram Playback Only Mode Timing Diagram: The diagram shows the necessary voltages and timings for different operation modes in Playback Only Mode. ANC/CSDA Pin ANC ON Playback Only Mode ANC ON 200-400ms 200-400ms >65% VBAT <35% VBAT Operation Mode |
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