51 52
SANYO TV . VCR SANYO TV . VCR
LA72670M10
µ
F
0.1
µ
F
4.7
µ
F
1.0k
Ω
A GND
Monitor IN(R)
10k
Ω
4.7
µ
F
Monitor
IN(L)
1
µ
F1
µ
F
+
+
+
+
+
22
µ
F
+
10
µ
F
+
4.7
µ
F
+
0.01
µ
F
4.7
µ
F
0.01
µ
F
0.01
µ
F
0.01
µ
F
22
µ
F
100
µ
F
39k
Ω
470
Ω
4700P
2.7k
Ω
+
+
+
++
1 20191817161514131211109876543260 41424344454647484950515253555657585961
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
40
39
38
37
36
35
34
33
32
31
30
29
28
27
2625
24
23
22
21
1.0k
Ω
4.7
µ
F+
1
µ
F+
4.7
µ
F+
1
µ
F+
4.7
µ
F+
22
µ
F+
22
µ
F+
4.7
µ
F+
4.7
µ
F+
0.1
µ
F+
1
µ
F
4.5MHz BPF
1
µ
F
1
µ
F
+
MTS GND
EXT1 IN (R)
EXT2 IN (R)
EXT3 IN (R)
MUTE
AF SW
CLOCK
DATA
MODE OUT
EXT3 IN (L)
EXT2 IN (L)
EXT1 IN (L)
LINE OUT (L)
LINE OUT (R)
VCC (H) 9V
MTS VCC (9V)
Normal OUT
Normal IN
TO RF MOD
ALWAYS 5V
+
4.7
µ
F
4.7
µ
F
++
2.2
µ
F
2.2
µ
F
1
µ
F
+
1
µ
F
++
1
µ
F
1
µ
F
D GND
10
µ
F 0.01
µ
F
PRE GND
10
µ
F
4.7
µ
F
0.01
µ
F
4700P
22
µ
F
0.033
µ
F
+ + +
54SIF IN
MTS
MONITOR
HiFi "Tracking D
(NORMAL:Low)
VCC (L) 5V
REC MUTE
LIM
AMP
A GND
PB AMP
PR AMP
REC AMP
REC-T
REC-H
A GND
fsc IN
3.58MHz
DO DET
VRFF
SIF
DEMOD STEREO
FILTER
STERO
PII
L-R
DEMOD
SAP
FILTER
PILOT
CANCEL
PILOT
DET
PIPPLE
FILTER
FIITER
Adj.
dbx
DEC ST/SAP
SW SAP
DEMOD SAP
DET
D.C
CONT
MATRIX
R-CH
IN SEL
ALCMUTE OUT
SEL
L-CH VREF
ENV
DET
COMP
NOISE
DET
R-CH
BPF
L-CH
BPF
Ø
COMP
LIM
DFV
VCO
LPF
MIX
SW
NOISE LIM
LOGIC
HOLD
PULSE
R-CH
PNR
+
LA72680MMONITOR IN (R)
+ + + + + +
EXT3 IN (L)
EXT2 IN (L)
EXT1 IN (L)
EXT2 IN (R)
EXT3 IN (R)
EXT1 IN (R)
Normal OUT
LINE OUT (L)
LINE OUT (R)
MONI TOR (L)
Normal IN
ALWAYS +B
TO RF MOD +
22
µ
F
+
10
µ
F
+
4.7
µ
F0.01
µ
F
+
+
+10
µ
F
++
1
µ
F
4.7
µ
F
4.7
µ
F
1.0k
Ω
10k
Ω
0.47
µ
F
1
µ
F
VCC(H) 9V
MTS VCC(9V)
A GND
NC
NC
NC
NC
NC
MTS GND
1 2 3 7 8 9 10 11 12 13 14 15 16 17 18 19 2060 59 58 57 56 55 54 53 52 50 4880
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
21
22
23
24
25
2627
28
29
30
31
32
33
34
35
37
38
39
40
64 5+
+
4.7
µ
F
1
µ
F
+
1
µ
F
+
1
µ
F
4.7
µ
F 4.7
µ
F 4.7
µ
F2.2
µ
F
4.5MHz BPF SIF DET IN
fsc IN
3.58MHz
2.2
µ
F
+
22
µ
F1
µ
F
+
10
µ
F
+
4.7
µ
F 0.01
��
F 4700P
0.01
µ
F
0.1
µ
F
0.1
µ
F
1.0k
Ω
JUST IN
CLOCK OUT
0.1
µ
F
MUTE
AF SW
CLOCK
DATA
MODE OUT
MTS
MONITOR
HiFi Tracking DC
(NORMAL:Low)
VCC (L) 5V
REC MUTE
4.7
µ
F
0.01
µ
F
22
µ
F
470
Ω
4700P
2.7k
Ω
+
+
+
+
D GND
10
µ
F
10
µ
F
0.01
µ
F
PRE GND
39k
Ω
IIM
AMP
PB AMP
PB AMP
REC AMP
REC-H
REC-H
ALC DET
A GND
A GND
47 46 45 44 43 42 4136
51 49SUB
DEMOD
SUB
DEEM
FIITFR
Adj.
SIF
DEMOD PLL
PIPPLE
FIITFR
COMP
SUB
DET
R-CH
IN SEL
ALCMUTE OUT
SEL
+
L-CH
VREF
ENV
DET
COMP
NOISF
DET
R-CH
BPF
L-CH
BPF
DO DET
COMP
LIM
DEV
VCO
LPF
MIX
SW
NOISE LIM
LOGIC
HOLD
PULSE
R-CH
PNR
AIC
CUE
BPF AM
DEMOD
15kHz
LPF 15kHz
IPF
4.5fH
TRAP SUB
BPF
JUST
CLK CONTROL
MATRIX
MAIN
DEEM
OUT
SW
Block Diagram Block Diagram
Overview
Functions
Overview
Functions
The LA72670M is a system IC that adds SIF and US standard multi channel television sound(MTS)signal decoding functions to the
Hi-Hi audio signal-processing functions of earlier devices. All adjustments have been implemented in the IC chip by either automatic
adjustment, trimming, or some other technique, making this device is fully adjustment free.
Hi-Fi Signal Processing
HiFi Processing with Built-in Audio Multiplex
Decoder for US Market Products
Hi-Fi audio signal record and playback processing
Head amplifier for Hi-Fi Audio signal
SIF demodulation
US standards compliant audio multiplex decoder
Package: QFP80 (14 14)
The LA72680M is a system IC that adds SIF and Japanese standard multi channel television sound(MTS)signal decoding functions
to the Hi-Fi audio signal-processing functions of earlier devices. All adjustments have been implemented in the IC chip by either
automatic adjustment, trimming, or some other technique, making this device is fully adjustment free.
Hi-Fi audio signal record and playback processing
Head amplifier for Hi-Fi Audio signal
SIF demodulation
Japanese standards compliant audio multiplex decoder
Package: QFP80 (14 14)