LG F2400 Service Manual page 32

4) Voiceband section
i. Receive audio signal from microphone. F2400 use differential configuration.
ii. Send audio signal to speaker. F2400 use differential configuration.
iii. This section provides an audio codec with a digital-to-analog converter and an analog-to-digital
converter, a ring tone volume controller, a microphone interface, and multiple analog input and
output channels.
iv. It interconnect with external device like main microphone, main receiver, and headset jack through
the AIN1N, AIN1P, AIN2N, AIN2P, AIN3N, AIN3P, AOUT1P, AOUT1N, AOUT2P, AOUT2N,
AOUT3P, and AOUT3N port.
• AIN1P, AIN1N: Main microphone positive/negative terminal
• AOUT1P, AOUT1N: Main Speaker positive/negative terminal
• AIN2P, AIN2N : EarMic microphone positive/negative terminal
• AOUT3P, AOUT3N: EarMic speaker positive/negative terminal
Figure 9 : AD6537B AUDIO SECTION
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3. TECHNICAL BRIEF