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AM-NX1
• IC Block Diagrams
IC381 AN17020A-VB
16
15
14
13
BEEP
MUTING
HEADPHONE AMP
−
LINE AMP
+
CH1 IN
1
HP/LINE
GND
2
SWITCH
HEADPHONE AMP
+
CH2 IN
3
LINE AMP
−
VREF
VCC 1HV
4
REF1
REF2
5
6
7
8
IC501 SN761058AZQLR
56
55
54
53
52
51
50
49
AVCC
IX
1
ABCD
PS
2
EQ
3
A GND
4
OFC-C1
5
RF
TPP/WPP
TE
OFC-C2
6
VREF10
7
VC
8
RFO
9
VREF09
10
AVCC2
11
AVCC2
PD-NI
12
PD-I
13
PD-O
14
SIGNAL MONITOR
ADIP
15
16
17
18
19
20
21
22
12
CH1 OUT
11
PGND
10
CH2 OUT
9
CH2 SENS
48
47
46
45
44
43
PEAK/
OFTRK
T-ON
BOTM
42 FE
41 ABCD
40 RFI
FE
39 ASSY
38 CIG
37 EFMO
DGND
36
RESET
35
34 VGIN
33 SBUS
32 SCK
31
CPOUT
POWER
CP
30
SUPPLY
29
DVCC
23
24
25
26
27
28
IC601 XPC18A22AEPR2
42
41
40
39
38
37
OUTPUT SW
VC VG DC IN
VG
VB
43
CHARGE
MONITOR
HI-BRIDGE
BATM
44
X2/X4
PRE DRIVER
DC IN
VC
CONTROL
CHARGE
CHGSW
45
CONTROL
DC IN
RS
46
BATTERY
INP2
47
CHARGER
&
INM2
48
REGULATOR
RF2
49
DCIN
50
DC IN
CHGMON
51
DC IN
DC IN
DC IN
SVREF
52
BANDGAP
DETECT
GND
53
GAIN
54
CHG
55
DREG
56
IC651 XC6367A331MR
PHASE
1
VOUT
COMPENSATION
PWM
ERROR AMP
COMPARATOR
VDD
2
+
+
–
–
PWM/PFM
CONTROLER
REFERENCE
VOLTAGE WITH
RAMP WAVE
CE
3
SOFT START/
GENERATOR/
CHIP ENABLE
OSC
46
46
36
35
34
33
32
31
30
29
VG3
VG2
VG
VG2
VG3
VC2 VG
VG2
CHARGE
CHARGE
PUMP 2
PUMP 1
OUTPUT SW
VC2
VC
EFM
VREF
PRE DRIVER
BUFFER
CONTROL
VC
VC AMP
VG2
VC
PWM
VC
VG
SYSTEM
SET-UP DOWN
PRE DRIVER
SW
VIO
LEVEL
SHIFT
OUTPUT SW
VIO
VC
1
2 3 4 5 6 7
8
9
10
11
12
13
14
BUFFER/
5
EXT
DRIVER
4
GND
28
C1H
27
C1L
26
VC2
25
VREF
24
CVREF
23
GND
22
DW BT
21
DW TP
20
RF1
19
INM1
18
INP1
17
DTC
16
VREC
15
VRECO2
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