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WM9713 데이터시트(PDF) 106 Page - Wolfson Microelectronics plc

부품명 WM9713
상세설명  AC 97 AUDIO TOUCHPANEL CODEC
PDF  111 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9713 데이터시트(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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