Pop-free headset detection circuit
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United States of America Patent
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Dec 26, 2017
Grant Date -
N/A
app pub date -
Apr 20, 2017
filing date -
Jan 13, 2017
priority date (Note) -
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Abstract
A pop-free headset detection circuit includes a socket unit, a first operational amplifier, a second operational amplifier and a detection and control circuit. An inverting input end of the first operational amplifier is connected to a left-channel audio source. A non-inverting input end of the first operational amplifier receives a first reference voltage. An inverting input end of the second operational amplifier is connected to a right-channel audio source. A non-inverting input end of the second operational amplifier receives a second reference voltage. When there is a headset plug of a headset plugged into the socket unit, the detection and control circuit controls the first operational amplifier and the second operational amplifier to be in a Hi-Z state, disconnects the first operational amplifier and the second operational amplifier and their feedback resistors, and then determines the type of the headset.
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Family
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