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STW5098 Datasheet(PDF) 28 Page - STMicroelectronics

Part # STW5098
Description  Dual low power asynchronous stereo audio Codec with integrated power amplifiers
PDF  86 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW5098 Datasheet(HTML) 28 Page - STMicroelectronics

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4.18
Microphone biasing circuits
The Microphone Biasing Circuits can drive mono or stereo microphones and can switch
them off when not needed in order to save the current used by the microphone biasing
network on each entity. Two bits control the behavior of the microphone bias circuit: MBIAS
in CR17 enables the circuit (fixed voltage at MBIAS pin), while bit MBIASPD in CR17 affects
the behavior of MBIAS pin when the function is not enabled. In particular when MBIASPD=1
the MBIAS pin is pulled down, otherwise it is left in tristate mode. The specification for the
microphone biasing circuits can be found in
Section 10.6 on page 64.



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