Earpiece; Hands-Free Interface; Headset Jack Interface - LG G5300 Service Manual

3.14 Earpiece

The earpiece is driven directly from AD6521 VOUTNORP (#K8) and VOUTNORN (#K7) pins and
the gain is controlled by the PGA in an AD6521. The earpiece is placed in the front cover and
contacted to main PCB.
VOUTNORP
VOUTNORN

3.15 Hands-free Interface

The audio out (VOUTAUXP & VOUTAUXN) to the hands-free kit consists of a pair of differential
signals from AD6521 auxiliary outputs (#K9, #K6), which are tracked down the board to carkit
connector (CN301) at the base of the handset. The DC level of the signal is supplied to the
VOUTAUX pin. And the EXT_IN signal is then input to the VINAUXP (#H10) and VINAUXN (#G10)
of AD6521.

3.16 Headset Jack Interface

This phone chooses a 3-pole type ear-mic jack which has three electrodes such as Receiver +,
Mic+, and GND. This type usually supports only single-ended configuration in the audio path. But
most of phones use the common interface.
C203
39p
C206 C207
39p 39p
CLOSE TO RECEIVER
Figure 3-31. Earpiece.
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3. TECHNICAL BRIEF
CN202
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