Sanyo EP58B specifications LA72670M, LA72680M

Hi-Fi Signal Processing

HiFi Processing with Built-in Audio Multiplex

Decoder for US Market Products

LA72670M

Overview Overview

Hi-Fi Signal Processing

HiFi Processing with Built-in Audio Multiplex Decoder for Japanese Market Products

LA72680M

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.

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.

Functions Functions

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)

Block Diagram

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)

Block Diagram

	fsc IN			fsc IN
4.5MHz BPF	3.58MHz		4.5MHz BPF	3.58MHz
				SIF DET IN
SIF IN
		MUTE		MTS VCC(9V)
				MUTE

1∝F

+

+

+

1∝F

+

+

0.033∝F

F4.7∝

2.2∝F

1∝F

+

10∝F

+

+

4700P

22∝F

+

+

+

+

+

+

+

1∝F

+

+

+

+

MTS VCC (9V)

F 4.7 ∝

F 2.2 ∝

F 1 ∝

F 1 ∝

F 4.7 ∝

F 0.01 ∝

4.7 F

2.2 F

1 F

4.7 F 4.7 F

2.2 F

10 F 4.7 F 0.01 F 4700P

22 F

∝

∝

∝

∝

∝

∝

∝

∝

∝

∝

+

NC

1∝F

+

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

1∝F

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

MTS

+

61

PIPPLE

A GND

40

61

PIPPLE

A GND

40

MTS

LIM

MODE OUT

FIITFR

IIM

AIC

VRFF

FILTER

FIITFR

MODE OUT

∝

+

62

AMP

R-CH

39

AF SW

NC

62

Adj.

AMP

R-CH

39

AF SW

1 F

SIF

STEREO

PILOT

PNR

SIF

CUE

AM

PLL

PNR

63

DEMOD

FILTER

DET

38

CLOCK

NC

63

DEMOD

BPF

DEMOD

38

CLOCK

0.1∝F

+

64

37

DATA

0.1∝F

STERO

64

4.5fH

37

DATA

4.7∝F

+

COMP

65

FIITER

SAP

PILOT

PII

HOLD

36

0.1∝F

TRAP

SUB

HOLD

LOGIC

65

36

22∝F

+

Adj.

FILTER

CANCEL

L-R

PULSE

D GND

15kHz

15kHz

SUB

BPF

PULSE

LOGIC

D GND

66

DEMOD

35

JUST IN

66

JUST

LPF

IPF

DEMOD

35

4.7∝F

+

67

dbx

ST/SAP

SAP

LIM

SW

LIM

34

CLOCK OUT

CLK

SUB

CONTROL

LIM

SW

67

MAIN

LIM

34

MONITOR

22∝F

+

DEC

SW

DEMOD

SAP

NOISE

MONITOR

SUB

DET

NOISE

0.1∝F

DEEM

68

CONT

DET

DFV

33

NC

68

DEEM

MATRIX

DEV

33

10∝F 0.01∝F

10∝F

EXT1 IN (R)

69

Ø

R-CH

32

VCC (L) 5V

EXT1 IN (R)

69

COMP

R-CH

32

MTS GND

VCO

COMP

BPF

+

100∝F

MTS GND

OUT

VCO

BPF

+

VCC (L) 5V

70

MATRIX

D.C

DO DET

31

70

SW

31

∝

L-CH

DO DET

L-CH

0.01 F

LPF

NOISE

NOISF

EXT2 IN (R)

71

BPF

30

0.01∝F

+

39kΩ

EXT2 IN (R)

71

LPF

BPF

30

39kΩ

4.7∝F

10∝F

+

+

DET

DET

+

72

MIX

29

4.7∝F

72

ALC DET 29

∝

R-CH

R-CH

MIX

4.7 F

73

IN SEL

28

EXT3 IN (R)

1 F

+

PR AMP

EXT3 IN (R)

1 F

+

73

IN SEL

PB AMP

28

2.7k

IN(R)

2.7kΩ

∝

74

REC-H

27

∝

74

REC-H

27

Ω

Monitor

0.01∝F

∝

4.7∝F

+

470Ω

0.01 F

1∝F

+

75

COMP

REC AMP

26

MONITOR IN (R)

75

COMP

REC AMP

26

470Ω

76

+

25

0.01∝F NC

76

+

25

MUTE

ALC

OUT

ENV

PRE GND

MUTE

ALC

OUT

ENV

PRE GND

77

SEL

DET

24

HiFi "Tracking D

77

SEL

DET

24

4.7∝F

+

PB AMP

4.7∝F

PB AMP

(NORMAL:Low)

+

HiFi Tracking DC

LINE OUT (R)

78

REC-T

23

LINE OUT (R)

78

REC-H

23

1.0kΩ

4700P

1.0kΩ

4700P

(NORMAL:Low)

A GND

A GND

79

L-CH

22

79

L-CH

22

4.7∝F

+

VREF

+

0.01∝F

10kΩ

4.7∝F

+

VREF

+

LINE OUT (L)

80

A GND

21

LINE OUT (L)

80

21

A GND

10kΩ

1.0kΩ

22∝F

1.0kΩ

22∝F

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

TO RF MOD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

TO RF MOD

REC MUTE

VCC (H) 9V

4.7∝F

+

+

+

+

+

+

+

VCC(H) 9V

4.7∝F

+

0.47∝F

+

+

+

+

+

+

REC MUTE

Normal IN

0.1∝F

10∝F

1∝F

22∝F

10∝F 4.7∝F

0.01∝F

Normal IN

10∝F

1∝F

1∝F

22∝F

10∝F

4.7∝F 0.01∝F

ALWAYS 5V

1∝F

ALWAYS +B

Normal OUT

Normal OUT

EXT1 IN (L)

Monitor

EXT1 IN (L)

EXT2 IN (L)

IN(L)

EXT2 IN (L)

EXT3 IN (L)

EXT3 IN (L)

MONI TOR (L)

51 SANYO TV . VCR SANYO TV . VCR 52