MS6821
MOSA
4 Stereo inputs / 2W PA output integrated Audio DAC and Volume Control
Circuit
J1
AVDD
R1
220
C1
47u
1
2
Q1
+
+
+
R2
DVDD
S1
1
2
3
W1
+
C2
VS
10K
C3
0.1u
10u
R20 R21
1K 1K
C4
1u
R18 R19
1K 1K
Jumper
GND
IR
RST
U1
J13
IR_IN
R3
1
20
19
RX
TX
RST
P3.0
P3.1
XTAL2 P1.5
XTAL1 P1.4
P3.2
P3.3
P3.4
P3.5
GND
Vcc
P1.7
P1.6
AGND
DGND
1
2
3
RX
TX
2
3
IN1
D1
10K
IR
18
17
16
15
14
13
12
11
+ C5
470P
C6 20P
4
IN2
D2
5
6
7
8
LCD
IR_IN
SCL
SDA
IN3
D3
IN4
D4
P1.3
P1.2
P1.1
P1.0
P3.7
Y1
24M
W2
JUMP
C7 20P
HP_IN
9
DGND
10
DGND
+
AT89C4051
R22 100K
J2
R4 100K
AVCC
1
2
C12
+
+
AVCC
1u
C8
0.1u
C9
1u
J3
R5
R6
R7
1K
1K
1K
1
2
3
4
C10 0.47u
U2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
DAC_IN
WS
DATA
SCL
SDA
L1
L2
L3
L4
VDD
PVDDL
ꢂOUTL
+OUTL
GND
PVSSL
DAC_L
27 SCL
BCK
REF
R1
J4
1
2
3
C11
C13
C14
10u
10u
10u
26 SDA
25
24
23
22
21
20
19
18
17
16
15
R
L
G
R10
R11
1K
1K
R2
R3
R4
Vss
PVDDR
ꢂOUTR
+OUTR
GND
PVSSR
DAC_R
IN1
J5
1
2
3
R
L
G
SP1
SP2
R12
R13
1K
1K
C15
C16
C20
C22
C23
10u
10u
10u
10u
10u
IN2
J6
SPK_R
SPK_L
1
2
3
+
R
L
G
+
C17
1u
C18
100u
C19 100u
+
L
HP
R14
R15
1K
1K
MS6821
IN3
J8
C21
1u
1
2
3
R
G
R
L
G
+
HEADPHONE
J9
R16
R17
1K
1K
+
C24
100u
C25
100u
IN4
J10
R8
1K
R9
1K
1
2
3
1
2
3
OUT
DAC_OUT
J12
1
2
3
R
L
G
DAC_OUT
AGND
REVꢀ 1.0
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MOSA [ MOSA ELECTRONICS ]
