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■ 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)
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.