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AN12906A Datasheet - Page 2

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I Block Diagram
Gain Change
100kΩ
High/Low
Mic Amp
ON/OFF
33
34
Mic IN
0.47µF
35
Mic voltage
36
Supply
1µF
Vref
37
10µF
Vcc
38
+3.3 V
1µF
39
0.1µF
2.2Ω
40
15Ω
220µF
L-ch
HP
41
GND
R-ch
HP
16Ω
15Ω
220µF
42
0.1µF
2.2Ω
Vcc_SP
43
+3.3 V
44
HP
Save
NC
1
+
SP
8Ω
(Note) • Circui,circuit constant show an example and don't guaratee design of set.
• The condenser and the resistor for the osillation measure of Headphone output, speaker output is in need
of install on the bord.
• Please you make use to 20-pin and 21-pin are short, and 19-pin is open , if you don't use a low pass filter is
made up 19-pin,20-pin and 21-pin.
27kΩ
27kΩ
0.47µF
32
31
30
29
28
27
Vref
Vref
Vcc
VrefHP
2
3
4
5
6
7
SP
GND
SP
Beep IN
Save
0.47µF
26
25
24
23
Det
22
AGC
21
20
19
18
17
16
15
LPF
14
13
LPF
12
NC
NC
8
9
10
11
0.47µF
Mute
ON/OFF
AGC ON/OFF
10kΩ
10kΩ
Audio Rec Out
0.47µF
Audio IN L-ch
0.47µF
STB ON/OFF
Audio IN R-ch
0.47µF

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