VIF/SIF Signal-Processing Circuit

LA7567BM/BVA

Overview

The LA7567MB and LA7567BVA are PAL/NTSC multi-system VIF/SIF ICs that adopt a partially adjustment-free circuit structure. The LA7567BMV is provided in an SSOP24 (225 mil, 0.5 mm lead pitch) package that is optimal for miniature 2-in-1 tuners.

The VIF block adopts a technique that makes AFT adjustment unnecessary by adjusting the VCO, thus simplifying the adjustment process. PLL detection is adopted for FM detection to handle audio multipath detection. These ICs include a on-chip SIF converter, making design of multi-system products easier. The supply voltage is the same 5 V used in multimedia systems. In addition, an on-chip buzz canceller suppresses Nyquist buzz for superb audio quality.

These products provide improved video and audio signal-to-noise ratios and improved video signal amplitude as compared to the LA7567N/NM.

Functions and Features

VIF amplifier

AGC

PLL detector

Multi SFI converter

BNC

Limiter amplifier

RF AGC

PLL FM detector

Equalizer amplifier

The AFT and SIF require no coils and are adjustment free

AFT

PAL/NTSC multiformat audio systems can be implemented easily

IF AGC

Built-in buzz canceller for excellent audio characteristics

Buzz canceller

VCC = 5 V, low-power operation

First SIF

Packages: LA7567BM: MFP24S (300mil)

First SIF detector

LA7567BVA: SSOP24 (225mil)

 

 

 

 

 

 

Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

IN PUT

 

 

 

 

 

 

 

 

 

 

 

 

TSF5220

 

SAW

 

 

9V

 

 

 

 

 

 

 

 

 

 

 

 

RF AGC

 

 

5.6k

 

 

 

 

 

 

 

 

(S)

 

OUT

30k

 

 

+

 

 

 

 

SAW(P)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000pF

100k

 

AF OUT

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

1F

 

 

 

 

 

 

 

 

0.01F

 

AFT

(M)

 

 

 

 

 

 

 

 

 

 

 

 

 

10k

-B

 

 

1k

(M)

 

 

 

 

 

OUT

0.015F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.022F 0.01F

 

 

 

100k

 

24

23

22

 

21

20

19

18

17

16

15

14

13

 

 

 

 

 

 

RF

 

IF

LIF

 

 

1st

 

 

 

 

 

 

 

 

 

AMP

 

 

 

 

 

 

 

 

 

 

AGC

AGC

AGC

AMP

 

 

 

 

FM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIDEO

 

 

1st

 

AFT

 

 

 

 

 

 

 

 

 

DET

 

 

DET

 

 

 

 

 

 

 

 

 

HPF

 

 

 

 

 

 

 

 

LIM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP

 

 

 

 

 

HPF

 

 

 

 

 

 

 

 

 

 

MIX

 

 

 

 

 

 

 

 

 

VCO

 

 

 

 

HPF

 

 

 

 

EQ

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP

 

 

 

 

 

 

 

1

2

3

 

4

5

6

7

8

9

10

11

12

 

 

 

+

 

 

+

 

 

 

 

 

 

 

 

 

 

 

1F

10k

 

 

 

 

 

 

 

 

 

 

 

 

100F

 

0.01F

 

150

0.47F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BPF

330

 

 

 

 

 

 

 

 

 

560

 

 

 

 

 

 

 

 

 

 

 

15H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

330

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

2.2k

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIDEO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT

VIF/SIF Signal-Processing Circuit

LA75676V/676VA

Overview

The LA7576V and LA7576VA are NTSC intercarrier VIF/SIF ICs that adopt a partially adjustment-free circuit structure. The LA7567VA is provided in a SSOP24 (225 mil, 0.5 mm lead pitch) package that is optimal for miniature 2-in-1 tuners.

The VIF block adopts a technique that makes AFT adjustment unnecessary by adjusting the VCO, thus simplifying the adjustment process. PLL detection is adopted for FM detection.

The supply voltage is the same 5 V used in multimedia systems. In addition, an on-chip buzz canceller suppresses Nyquist buzz for superb audio quality.

Functions and Features

VIF amplifier

Limiter amplifier

PLL detector

PLL FM detector

BNC

The AFT and SIF require no coils and are adjustment free

RF AGC

Built-in buzz canceller for excellent audio characteristics

Equalizer amplifier

VCC = 5 V, low-power operation

AFT

Packages: LA7576VA: SSOP24 (225mil)

IF AGC

LA7576V: SSOP24 (275mil)

Buzz canceller

 

 

 

 

 

 

Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RF AGC

 

 

4.5MHz

 

 

 

IN PUT

 

 

 

 

 

OUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT

 

 

 

 

 

 

 

 

 

 

 

120k

 

 

10k-VR

 

1000pF

 

 

 

 

 

 

 

 

 

AF OUT

+

 

 

 

 

 

0.01F

 

 

AFT OUT

7.5k

 

 

 

 

SAW(P)

 

 

 

 

 

 

 

 

0.01F

1F

 

 

 

 

 

 

F0.01(M)

F0.015(M)

 

300pF

 

1000pF

 

10k-0

 

 

GND

 

 

 

 

 

 

(M)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

23

22

21

20

19

18

17

16

15

 

14

13

 

 

 

 

 

 

 

 

 

6.8k

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

30k

 

FM

 

 

RF

IF

 

VIF

 

 

 

 

 

 

 

 

DET

 

 

 

AMP

 

 

 

 

 

 

 

 

 

 

 

AGC

AGC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AFT

 

 

 

 

 

 

 

VIDEO

 

 

 

 

 

 

 

120k

LIM

 

 

 

 

 

DET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMP

 

6 bB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HPF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EQ

 

 

 

 

 

 

VCO

 

 

 

 

 

 

 

AMP

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

9

10

 

11

12

 

 

+

 

+

 

 

 

 

+

 

 

 

 

 

 

 

1F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1F

0.01F

 

 

 

0.47F

560

 

 

 

 

BPF

330

 

 

 

 

 

 

 

 

 

 

 

 

4.5 MHz

 

 

 

 

 

 

 

15H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

330

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

2.2k

GND

VIDEO OUT

47 SANYO TV . VCR

SANYO TV . VCR 48

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Sanyo EP58B specifications Agc, Bnc, Aft, If AGC