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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM9713 датащи(PDF) 106 Page - Wolfson Microelectronics plc |
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WM9713 датащи(HTML) 106 Page - Wolfson Microelectronics plc |
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106 / 111 page  WM9713L Preliminary Technical Data 1 PTD, March 2004, Rev 2.2 106 Figure 41 Hookswitch Detection Circuit The circuit uses a GPIO pin as a sense input. The impedance of the microphone and the resistor in the MICBIAS path must be such that the potential at the GPIO pin is above 0.7 ×DBVDD when the hookswitch is open, and below 0.3 ×DBVDD when it is closed. TYPICAL OUTPUT CONFIGURATIONS The WM9713L has three outputs capable of driving loads down to 16 Ω (headphone / line drivers) – HPL, HPR and MONO - and four output capable of driving loads down to 8 Ω (loudspeaker / line drivers) – SPKL, SPKR, OUT3 and OUT4. The combination of output drivers, mixers and mixer inverters means that many output configurations can be supported. Below are some examples of typical output configurations for smartphone applications. STEREO SPEAKER Figure 42 shows a typical output configuration for stereo speakers with headphones, ear speaker and hands-free operation. The table shows suggested mixer outputs to select for each output PGA for a given operating scenario. (Note the inverted mixer outputs can be achieved using the mixer output inverters INV1 and INV2). |
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