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1
D D
C C
B B
A A
+3.3V
+3.3V
+3.3VA
+3.3V
+3.3VA
+3.3VA
+3.3VA
Vref
Vref
+5A
+5A
+5A
Vref
Vref+5A
+5A
+5A
+5A
GND
PCM2901-D+
VBUS2-SW
PCM2901-D-
GND-USB
DTR-PK232
PCM2901-CLKIN-12MHz
Title
Size Document Number Rev
Date: Sheet
of
<Doc> 12-4.1
USB Audio & SC/TNC Switch
C
55Monday, October 31, 2011
SC TX Data Audio Out L
Volume Down
Volume up
Mute
SC RX Data Audio Out L
PCM2901 SC Audio Input L
Sound Card Audio Out
Level Adjust
C59 (R160) from PK-232 TX Audio Out
(Remove R160)
R160/SW2 to TX Audio In
SW2 is Radio 1 / Radio 2 Switch
SC RX input audio
C54/SW2 from RX Audio out
SW2 is Radio 1 / Radio 2 Switch
R34/C54 to PK-232 Audio IN
OR
DSP Audio IN (if installed)
DSP Cap bypass.
Short if DSP is installed
R149 - Q6 from PK-232
Sound Card / TNC Switch
PK-232 Panel
Sound Card / TNC
Toggle Switch
Aux Audio Out R
Aux Audio In R
Aux Audio In R
To Connector
Board
PK-232 Panel LED
Sound Card / TNC
Aux Audio Out R
1-2 L+R combined (default)
2-3 L+R split
1-2 L+R combined (default)
2-3 L+R split
R140
1k
+
C75
10uF/6.3V
R130
100
R126
10
R11810k
+
C79 10uF
R121
1k
R98
12.0k
R109 0
J10
HEADER_4
1
2
3
4
R105
3.9k
R91
1.5k
+
C91
10uF
+
C68
4.7uF/6.3V
R122
open
R93 Open
C108
0.1uF
C101
.01uF
+
C76
10uF
R113
47
R123
10k
R156 10k
J9
HEADER 3
1
2
3
R124
10k
R89
20k
-
+
U23A
AD8656
3
2
1
8 4
C128
1nF
VDD
GND
S1
S2
U25
ADG749BKSZ
1
4
6
5
23
R139
1k
R94
1.0M
JP16
Header 4x1_2
1
2
3
4
R128
500
R95
100
R106
12.0k
R119
3.3k
+
C95
10uF
R129
10k
C88
0.1uF
+
C67
100uF
R157 10k
C96
.01uF
R79
20k
C85
1800pF
R133
Open
R127
open
+
C78
10uF/6.3V
C74 330pF
+
C99
10uF
T1
600:600
1 6
5
3 4
7 8
C71
0.1uF
T2
600:600
1 6
5
3 4
7 8
+
C80
10uF
C83
330pF
R102 open
C82
.01uF
R114
OPEN
C81
1800pF
JP21
Header 2
1
2
-
+
U24B
AD8656
5
6
7
C98 22pf
R117
10k
Q4
2N7002
C112
47pF
U19
74LVC1G08/SOT
OUT
4
IN2
2
IN1
1
VDD
5
GND
3
C123 22pF
C89 330pF
JP19
Header 2
1
2
-
+
U23B
AD8656
5
6
7
R84
500
13
2
R82
1.5k
R132 1000
-
+
U22B
AD8656
5
6
7
R116
10k
R111
500
R87
4.7k
+
C65 10uF
R78
47k
C93
1800pF
D3
1N4148
R108
0
JP20
JUMPER 3
1
2
3
+
C77
10uF
+
C94
10uF
+
C87
10uF
C97 22pF
C102
.01uF
Q3
open
JP18
Header 2
1
2
-
+
U24A
AD8656
3
2
1
84
+
C73
10uF/6.3V
R104
100
R125
10k
JP17
JUMPER 3
1
2
3
R99 12.0k
R77
0
R115
10k
U20
TPA6111A2
VDD
8
GND
4
VO1
1
VO2
7
BPAS
3
SDN
5
IN1
2
IN2
6
R110
10k
R81
47k
U21
PCM2901E
D+
1
D-
2
Vbus
3
DGNDU
4
HID0
5
HID1
6
HID2
7
SEL0
8
SEL1
9
Vccc
10
AGNDC
11
VinL
12
VinR
13
Vcom
14
SSPND
28
Vdd
27
DGND
26
TEST1
25
TEST0
24
Vccx
23
AGNDX
22
XTI
21
XTO
20
Vccp2
19
AGNDP
18
Vccp1
17
VoutL
16
VoutR
15
-
+
U22A
AD8656
3
2
1
8 4
JP23 JUMPER 3
1
2
3
R86 22
+
C84
10uF/6.3V
+
C92
10uF
R96
5k
D2
1N4148
LED4
RED
R90 12.0k
R143
10k
+
C69
10uF/6.3V
R101
3.9k
R85
10k
C70
0.1uF
C90
.01uF
+
C100
10uF
R107
10k
C72
.01uF
+
C86
10uF/6.3V
C127
CAP
Q2
2N7002
R120
10k
R142 0
+
C66 100uF
R88 22
R97
3.9k
R112
47
R103 12.0k
R141 0
R131
47
JP15
Header 2
1
2
R100
12.0k
R83
15k
R155 10k
21


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