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56
15.4. MAIN CIRCUIT (4/4)
I
K
L
J
M
O
P
N
15
16
17
18
19
20
21
22
23
24
25
26
27
28
P1
2
P1
AB
AA
TO MAIN
SECTION (3/4)
SECTION (3/4)
TO MAIN
SECTION (2/4)
SECTION (2/4)
A
MAIN CIRCUIT
SCHEMATIC DIAGRAM - 4
: MIC AUDIO INPUT SIGNAL LINE
: AUDIO OUTPUT SIGNAL LINE
: USB SIGNAL LINE
: +B SIGNAL LINE
RR-US551E/EE/PP MAIN CIRCUIT
2/4
4/4
1/4
3/4
DD_ON
R540
47K
DA
C309
220P
220P
CL
C305
1
C306
1
ET101*
1
C307
0
R425
R428
4.7M
D426
B0JCDD000019
0.1
C425
D427
B0JCDD000019
C304
1
ET102*
100K
R509
100K
R513
VBATT
C531
10
C510
220P
R507
220K
R512
560K
560K
R510
SWITCH
1M
2.2M
R511
6.3V100
C514
6.3V100
C515
C517
4.7
R508
100K
SWITCH
6.3V100
C518
S
D
G
B1CFFB000001
Q508
G1C6R8ZA0222
L513
2.2
C428
MCLK
D502
B0JCDD000019
USB_VBUS
6.3V22
C301
R541
470K
1
C509
R542
470K
1
4
2
3
IC509
VOLTAGE REGULATOR
C0DBGYY00462
10
C303
C302
1
23
21
22
24
19
17
18
20
31
29
30
1
32
2
4
3
28
26 25
27
10
12
11
8
6
5
7
9
13
15 16
14
C1AB00002900
IC301
1
2
ICP502
1.1A
B1ADCF000166
Q510
J0JAC0000055
LB315
J0JAC0000055
LB316
1000P
C331
1
G1
2
G2
P301
R325
8.2K
R323
8.2K
1
C324
1
C326
0.022
C313
0.022
C314
6.3V100
C312
R308
39
R307
39
HPIN_L
1000P
C332
J0JAC0000055
SWITCH
LB318
4
1
2
5
3
JK301
J0JAC0000055
LB317
QR301
B1GBCFJN0037
BCLK
DACDATA
LRCK
DIN
RIN1
RIN1
LIN1
[24] LIN3
LIN2
SDIN
SCLK
DBVDD
DCVDD
MODE
CSB
[1] MCLK
RIN3
CODEC
MICBIAS
RIN2
RIN2
ROUT1
OUT3
[10] MONOOUT
BCLK
DACDATA
DACLRC
[18] AVDD
VREF
AGND
HPGND
LOUT2
RUOT2
[9] ADCLRC
ADCDAT
LOUT1
[17] HPVDD
DGND
VMID
BATT-
BATTERY Terminal -
BATT+
BATTERY Terminal +
SW2.8V
SW2.8V
GND
GND
2.8V_DD_OUT
CE
VSS
OUT
IN
1
4
2
3
IC508
VOLTAGE REGULATOR
C0DBGYY00497
CE
VSS
OUT
IN
ESD_GND
LIN1
LIN2
J0JGC0000059
LB300
HP_MUTE_H
R319
0
330K
R312
2
8
9
1
3
4
6
5
7
IC304
C1AB00003292
AUDIO AMPLIFIER
OUT-
PGND
IN-
PVDD
AGC1
AGC2
OUT+
STBY
IN+
470K
R518
180K
R515
R514
27K
R516
820K
8
3
T1
4
5
6
7
9
10
2
1
THERMAL PAD
SYNCHRONUOS BOOST CONVERTER
C0DBAYY00754
IC512
LBO
LBI
GND
VBAT
PS
FB
SW
EN
PGND
VOUT
CL112
CL28
CL128
CL127
CL126
CL125
CL115
CL116
CL113
CL114
2 AAA LR03
BATTERIES/DC 3V
EARPHONE
SPEAKER
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