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3. TECHNICAL BRIEF
3.10 Main Speaker
The main speaker is driven directly by AD6720 AOUT1P and AOUT1N pins and the gain is controlled
by the PGA in an AD6720. The receiver is placed in the folder cover and connected to AOUT1x
terminal via FPCB.
26M_MIDI
_MIDI_RESET
_MIDI_CS
2V85_VCAM
2V85_VCAM
C228
C229
1u
1u
ACOUSTIC & MIDI
U204
C200
C205
10u
1u
MAX4684EBC_T
SPK_P
SPK_N
REC_P
REC_N
AIN3P
L17
R133
AIN3N
H16
AOUT1P
R135
K17
AOUT1N
U203
YMU762C-QZ
R210
NA
1
13MHz
CLK1
4
_RST
30
ADD00
A0
31
_RD
_RD
29
_CS
5
NC
28
_WR
_WR
3
_MIDI_IRQ
_IRQ
27
DATA08
D0
26
DATA09
D1
25
DATA10
D2
24
DATA11
D3
23
DATA12
D4
22
DATA13
D5
21
DATA14
D6
20
C222
DATA15
D7
1000p
R218
3.3K
6
PLLC
9
VREF
C224
0.1u
32
IOVDD
7
VDD
8
VSS
Figure 3-13. MAIN SPEAKER
C4
C2
NO1
IN1
A4
A2
NO2
IN2
100K
R631
C1
C3
NC1
COM1
A1
A3
NC2
COM2
4.7
C147
39p
R211
20K
11
HPOUT_R
10
C214
HPOUT_L
0.01u
R212
12
EQ1
33K
13
EQ2
C218
R214
120K
270p
14
EQ3
2
LED
19
MTR
17
SPOUT1
18
SPOUT2
VBAT
15
SPVDD
C227
0.1u
16
SPVSS
- 32 -
SPK_SEL
SPK_RCV_P
SPK_RCV_N
REC_P
REC_N
C213
SPK
0.1u
SPK_P
SPK_N
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