Ic block diagram – NAD C 542 User Manual
Page 19
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MAIN BOARD
U101: CXA2581N
IC BLOCK DIAGRAM
AC
SUM
AC
VCA
EQ_ON/OFF
VC
D
Vcc
R
W/R
OM
R
W/R
OM
R
W/R
OM
R
W/R
OM
R
W/R
OM
R
W/R
OM
R
W/R
OM
VC
VC
VC
DV
C
DV
C
V
OFST
V
OFST
B
C
A
D
V
OFST
EQ
APC
23
RFG
24
BST
26
RFC
25
VFC
14
DVC
27
VC
5
GND
22
Vcc
1
LD
2
PD
12
SW
11
E
10
F
9
D
8
C
7
B
6
A
15
RF
A
C
30
DC_OFST
29
RFDCI
28
RFDCO
17
FEI
16
FE
19
TE_BAL
18
TE
21
CEI
20
CE
13
D
Vcc
3
EQ_IN
4
AC_SUM
-
+
-
+
VC
VC
DV
C
D
Vcc
-
+
-
+
-
+
-
+
D
Vcc
-
+
-
+
D
Vcc
-
+
gm
gm
VC
VC
V
OFST
DV
C
DV
C
-
+
+
VC
Vcc
APC-OFF (Hi-Z)
R
W/R
OM
(H/L)
Vcc
+
MAIN BOARD
U202: BA6392FP
1
CH1OUTF
28 GND
2
F
INTER
FACE
REV
FWD
R
CH1OUTR
27 CH4OUTF
3
RCIN1
26 CH4OUTR
4
CH1RIN
25 VBIN
190K
100K
25K
25K
DRIVE
MUTE
5
CH1FIN
24 VSIN
6
VREFIN
23 VBIN
7
VREFOUT
22 VCC
8
GND
21 VCC
9
CH2FIN
20 CH3FIN
10
CH2RIN
19 CH3RIN
11
RCIN2
18 RCIN3
12
CH2OUTR
17 CH3OUTR
13
CH2OUTF
16 CH3OUTF
14
GND
15 MUTE
+
-
+
-
THERMAL
SHUTDOWN
CIRCUIT
F
INTER
FACE
REV
FWD
R
F
INTER
FACE REV
FWD
R
LEVEL
SHIFT
A1
B1
Y1
A2
B2
Y2
GND
VCC
B4
A4
Y4
B3
A3
Y3
1
2
3
4
5
6
7
14
13
12
11
10
9
8
MAIN BOARD
U403: TC74HC00AP
1
B
A
2
3
4
Out A
-In A
+In A
V-
8
7
6
5
V+
OUT B
_In B
+In B
+ —
— +
MAIN BOARD
U305, U306: OPA2134