Microphone - LG KG110 Service Manual

3. TECHNICAL BRIEF
VBAT
R200
SW20 10K
POWER
SW1
RIGHT
SW5
3
SW9
6
SW13
9
SW17
#

3.3.6 Microphone

The microphone is placed to the front cover and contacted to main PCB.
The audio signal is passed to AIN1P and AININ pins of AD6720.
The voltage supply VMIC is output from AD6720, and is a biased voltage for the AIN1P.
The AIN1P and AIN1N signals are then A/D converted by the voiceband ADC part of AD6720.
The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP section of AD6720 for
processing (coding, interleaving etc).
R209 680
KEY ON
SW2 SW3
UP LEFT DOWN
SW6 SW7
2 1 MENU
SW10 SW11
5 4 S2(OK)
SW14 SW15
8 7 SEND
SW18 SW19
0 * SELECT
Figure 3-8: Keypad Switches and Scanning
KEYPAD
SW4 SW20
CLR
R205
SW8
R206
SW12
R207
SW16
R208
SW21
R210
22
680
KEY _ROW0
680
KEY _ROW1
680
KEY _ROW2
680
KEY _ROW3
680
KEY _ROW4
KEY _COL0
KEY _COL1
KEY _COL2
KEY _COL3
KEY _COL4