LG W3000 Service Manual page 44

3. TECHNICAL BRIEF
3.14 Earpiece & Handsfree
The earpiece is driven directly from AD6521 VOUTNORP and VOUTNORN pins and the gain is
controlled by the PGA (Programmable Gain Amplifier) in an AD6521.
The audio out (VOUTAUXP & VOUTAUXN) to the hands-free kit consists of a pair of differential
signals from AD6521 auxiliary outputs, which are tracked down the board to carkit
connector(CN302) at the base of the handset.
The DC level of the signal is supplied to the VOUTAUX pin.
Figure 3-29
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