LG KG290 - Page 51

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3. TECHNICAL BRIEF
6. Headset Jack Interface
This phone is 4-pole type earphone jack, which has four electrodes such as L.SPK, R.SPK, MIC+ and
GND. This type usually supports single-ended configuration in the audio input path, and differential or
stereo configuration in the audio output path. So this phone uses single-ended audio input and stereo
audio output. But when the audio input signal is entered an AD6721, it is likely to differential signal.
When headset jack is put in and pressed the hook-switch of headset, the HOOK_DETECT signal is
goes to high, then the hook-switch is detected
7. Bluetooth & FM Radio (BCM2048)
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