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WM9713 bảng dữ liệu(PDF) 106 Page - Wolfson Microelectronics plc

tên linh kiện WM9713
Giải thích chi tiết về linh kiện  AC 97 AUDIO TOUCHPANEL CODEC
PDF  111 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM9713 bảng dữ liệu(HTML) 106 Page - Wolfson Microelectronics plc

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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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