Sanyo EP58B specifications Agc, Bnc, Aft, If AGC

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

5.6kΩ

(S)

OUT

30kΩ

+

SAW(P)

1000pF

100kΩ

AF OUT

GND

1∝F

0.01∝F

AFT

(M)

10kΩ

-B

1kΩ

(M)

OUT

0.015∝F

0.022∝F 0.01∝F

100kΩ

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

+

+

1∝F

10kΩ

100∝F

0.01∝F

150Ω

0.47∝F

BPF

330Ω

560Ω

15∝H

330Ω

VCC

2.2kΩ

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

10kΩ -VR

1000pF

AF OUT

+

0.01∝F

AFT OUT

7.5kΩ

SAW(P)

0.01∝F

1∝F

F0.01∝ (M)

F0.015∝ (M)

300pF

1000pF

10k-0Ω

GND

(M)

24

23

22

21

20

19

18

17

16

15

14

13

6.8kΩ

VCC

30kΩ

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

+

+

+

1∝F

1∝F

0.01∝F

0.47∝F

560Ω

BPF

330Ω

4.5 MHz

15∝H

330Ω

VCC

2.2kΩ

GND

VIDEO OUT

47 SANYO TV . VCR SANYO TV . VCR 48