Panasonic AN3497SB Datasheet

■ Overview

The AN3497SB is a chroma noise reduction (CNR) IC
for VCR and uses a chroma recursive filter system. In
combination with the AN2260 (luminance signal process­ing), AN2460 (chroma signal processing), etc., it config­ures a VHS signal processing system.

■ Features

•

Capable of meeting with the NTSC/PAL system.

•

Capable of meeting with the EDIT mode and THRU
mode.

•

The CNR limiter level and CNR output level can be adjust­ed depending on external DC.

•

The feedback constant (KC) can be set optionally depend­ing on an external resistor.

•

The chroma signal can be adjusted depending on an
external resistor.

•

Built-in functions such as Y vertical correlative signal
detector, etc.

1

ICs for VCR

AN3497SB

Chroma Noise Reduction IC

1

89

16

0.35±0.1 0.8

0.1±0.1

4.3±0.3

6.3±0.3

0.5

0.15

0.65

1.5±0.2

6.5±0.3

Unit : mm

16-Pin PANAFLAT Package (SSOP-016-P-0225a)

■ Block Diagram

V

CC

16 15 14 13 12 11 10 9

EF

GCA

B1

–20.8dB

0dB

20dB 20dB

A1

– 0.8dB
A2

Lim.

CTL

COR

22kΩ33kΩ

LPF

8.1dB
CEQ –2.1dB –13.2dB

–2.1dB

B

–13.2dB

2

1 2 3 4 5 6 7 8

GND

SW

–9.5dB

Det.