Sanyo EP58B specifications LA72648M, LA75665NM/NV

VIF/SIF Signal-Processing Circuit

LA75665NM/NV

Overview

The LA75665NM and LA75665NV are PAL/NTSC multi-system VIF/SIF ICs that adopt a partially adjustment-free circuit structure. The VIF block adopts a technique that makes AFT adjustment unnecessary by adjusting the VCO, thus simplifying the adjustment process.

PLL detection is adopted in the SIF block to handle audio multipath detection. The SIF input block provides four input systems and an internal input selection switch. This makes it easier to design products that handle multi-sound systems. Furthermore, this switch can also be used for video system sound trap switching. In addition, an on-chip buzz canceller suppresses Nyquist buzz for superb audio quality.

Functions and Features

The AFT and SIF require no coils and are adjustment free

PAL/NTSC multiformat audio systems can be implemented easily

Built-in buzz canceller for excellent audio characteristics

Package: LA75665NM: MFP24S (300mil)

LA75665NV: SSOP24 (275mil)

[VIF Block]		[First SIF Block]	[SIF Block]
VIF amplifier	AFT	First SIF amplifier	Multi-input selector switch
PLL detector	IF AGC	First SIF detector	Limiter amplifier
BNC	Buzz canceller	AGC	PLL FM detector
RF AGC
Equalizer amplifier

Block Diagram

330Ω

330Ω

330Ω

330Ω

8.2∝H

150Ω

6.5MHz 6.0MHz

5.5MHz

4.5MHz

5.5MHz 6.0MHz 6.5MHz

C

2.2kΩ

330Ω

15∝H

2.2kΩ

B

2.2kΩ

VIDEO

560Ω

2.2kΩ

4.5MHz

A

OUT

0.01∝F 0.01∝F 0.01∝F

47∝F

+

150Ω

30pF

1∝F

3kΩ

0.47∝F

24

23

22

21

20

19

18

+

16

15

14

13

17

INPUT SW

EQ

AMP

LIM

RF

IF

VIDEO

1ST SIF

AMP

AGC

AGC

DET

DET

F

FM

VIF

1ST

AMP

DET

AFT

VCO

1

2

3

4

5

6

7

8

9

10

11

12

AUDIO

1.5kΩ

+

1∝F

0.022∝F

OUT

0.01∝F

100kΩ

AFT

SAW(P)

SAW(S)

30kΩ

RFAGC

OUT

0.01∝F

100kΩ

VCC

+

OUT

0.01∝F

0.01∝F

100∝F

PAL Hi-Fi Audio Signal Record

and Playback Processing

LA72648M

Overview

The LA72648M is a PAL format system IC that adds a CANAL switch to the Hi-Fi audio signal-processing functions of earlier devices and aims at even lower power operation in power saving modes.

Functions

High fidelity audio signal record and playback processing

Head amplifier for Hi-Fi Audio signal

CANAL switch

Package: QFP80 (14 14)

Block Diagram

FM audio for PAL

TUNER IN (R) /

EXT1 IN (R) /SCART1

4.7∝F

+

F0.1∝

10∝F

4.7∝F

0.01∝F

4700P

22∝F

EXT2 IN (R) /FRONT

EXT3 IN (R) /SCART2

+

+

+

EXT4 IN (R) /AUX

N.C.

MONITOR IN (R)

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

0.1∝F

Logic-GND

VCC(5V)

GND-R

VCC-R

0.1∝F

61

40

62

7dB

ALC

R-CH

39

AF SW

10∝F

+

PNR

63

38

CLOCK

R-CH

64

37

4.7∝F

+

13dB

IN SEL

LIM

DATA

V

65

SW

ALC

SW

HOLD LOGIC

36

DEC OUT (R)

LogicCC

1.0kΩ

66

NOISE

DEV

NOISE

PULSE

35

A GND

VCCL 5V (P.ON 5V)

4.7∝F

+ 67

DET

R-CH

LIM

34

DEC OUT (L)

SW

ALC

VCO

COMP

MONITOR

1.0kΩ

13dB

BPF

68

DO DET

33

LPF

L-CH

10∝F 0.01∝F 100∝F

Simulcast

VCC

69

7dB

Normal

BPF

32

VCCL 5V

V H 9V (P.ON 9V)

V

(9V)

+

HA

CC

CC

MIX

(P.SAVE 5V)

0.1∝F

70

31

(Setoff in power save

modes)

ENV

71

LPF

30

N.C.

4.7∝F

+

7dB

DET

TO RF MOD

72

MUTE

+

VCO

COMP

29

2.7kΩ

10kΩ

73

V / I

REC-H

28

DEV

4.7∝F

+ 74

13dB

PB AMP

27

LINE OUT (R)

SW

1.0kΩ

+

OUT

LIM

0.01∝F

75

A GND

ALC

NOISE

26

470Ω

4.7∝F

SEL

+ 76

Normal

Simulcast

REC-AMP

25

LINE OUT (L)

PRE GND

1.0kΩ

13dB

77

24

PB AMP

REC-H

+

22∝F

L-CH

Normal OUT

78

23

10∝F

+

7dB

IN SEL

ALC

L-CH

79

22

PNR

Normal IN

80

VREF

VCC-L

21

4700P

HiFi "High"

GND-L

Normal "LOW"

0.1∝F

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

0.01∝F

N.C.

N.C.

N.C.

N.C.

10∝F +

+

+

+

MONITOR IN (L)

0.1∝F

TUNER IN (L) /

22∝F 0.1∝F

10∝F4.7∝F

0.01∝F

EXT1 IN (L) /SCART1

EXT2 IN (L) /FRONT

EXT3 IN (L) /SCART2

EXT4 IN (L) /AUX

REC MUTE

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