38
38
HCD-EC70
HCD-EC70
•
IC Block Diagrams
IC402 BA5947FM-E2
– BD83S Board –
1
LEVEL SHIFT
MUTING
D
15
16
+
–
+
–
D
D
17
18
D
19
20
VREF
21
22
23
24
25
26
27
28
PREVCC
OPOUT
OUTVREF
CH4CAPA
CH4IN
CH3FIN
CH3RIN
GND
MUTE
POWVCC
CH3OUTF
CH3OUTR
CH4OUTF
CH4OUTR
OPIN
–
2
OPIN+
INTERFACE
14
13
D
12
11
D
10
9
8
7
6
CH2FIN
CH2RIN
GND
5
4
CH1FIN
CH1RIN
VREFIN
POWVCC
CH2OUTR
CH2OUTF
CH1OUTR
CH1OUTF
INTERFACE
D
D
3
SW
INTERFACE
• Waveforms
– BD83S Board –
1
IC801
w;
(XOUT)
13.3
µ
s
1.8 Vp-p
5 V/DIV, 10
µ
s/DIV
1
IC701
qd
(X0A/P90)
30.5
µ
s
2.3 Vp-p
1 V/DIV, 10
µ
s/DIV
2
IC701
od
(X0)
239 ns
2.9 Vp-p
1 V/DIV, 100 ns/DIV
– PANEL Board –
200 mV/DIV, 500 ns/DIV
1 V/DIV, 20 ns/DIV
1 V/DIV, 10
µ
s/DIV
1 V/DIV, 200 ns/DIV
0.5 to 1.3 Vp-p
59.1 ns
3.3 Vp-p
22.7
µ
s
3.3 Vp-p
472 ns
3.4 Vp-p
1
IC201
u;
(RFACO)
(CD PLAY mode)
2
IC201
<z/,
(XTAO)
(CD PLAY mode)
3
IC201
1
(LRCK)
(CD PLAY mode)
4
IC201
5
(BCK)
(CD PLAY mode)
– MAIN Board –
IC203 BH18LB1WG-TR
1
VIN
2
GND
3
STBY
4
NC
5
VOUT
VOLTAGE
REFERENCE
THERMAL
PROTECTION
OVER CURRENT
PROTECTION
CONTROL
BLOCK
