NJM2224
VIDEO NOISE REDUCER
■
GENERAL DESCRIPTION
The
NJM2224
is a video noise reducer IC of which operation is to
reduce noise contained in video color and luminance signal, and at
the same time correct online of horizontal and vertical image signal.
The
NJM2224
is suited for VCR camera especially.
■
FEATURES
●
Operating Voltage
●
Package Outline
●
Bipolar Technology
■
PACKAGE OUTLINE
NJM2224M
(+4.75V to +5.25V)
DMP8
■
RECOMMENDED OPERATING CONDITION
●Operating
Voltage
V
+
4.75 to 5.25V
■
PIN CONFIGURATION
NJM2224M
Ver.2004-02-17
-1-
NJM2224
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
(Ta=25°C)
RATINGS
8
300
-20 to +75
-40 to +125
UNIT
V
mW
P
D
T
opr
T
stg
°C
°C
■
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating Current
Voltage Gain (Pin8-Pin2)
Voltage Gain (Pin1-Pin2)
Voltage Gain (Pin8-Pin6)
Bandwidth (Pin8-Pin2)
Bandwidth (Pin1-Pin2)
Bandwidth (Pin8-Pin6)
Pin6 DC Voltage
SYMBOL
I
CC
A
U11
A
U12
A
U21
A
U22
A
U31
A
U32
f
B1
f
B2
f
B3
V
6-DC
V
7
=4V, V
IN
=100mVp-p
V
7
=0V, V
IN
=100mVp-p
V
7
=4V, V
IN
=100mVp-p
V
7
=0V, V
IN
=100mVp-p
V
7
=4V, Pin2-1(Inv. Amp), V
IN
=20mVp-p
V
7
=4V, Pin2-1(Inv. Amp), V
IN
=300mVp-p
V
7
=4V, V
IN
=100mVp-p
V
7
=0V, V
IN
=100mVp-p
V
7
=4V, V
IN
=100mVp-p
TEST CONDITION
MIN.
-
-1
-11.5
-
-4.2
-
-5
10
10
8
-
(V
+
=5V, f=100kHz, Ta=25°C)
TYP.
6.9
0
-10
-45
-3.2
-
-3
-
-
-
1.3
MAX.
10
+1
-8.5
-38
-2.2
-20
-1
-
-
-
-
UNIT
mA
dB
dB
dB
MHz
MHz
MHz
V
NOTE: unless specified, all items are tested by Test Circuit.
■
TEST CIRCUIT
-2-
Ver.2004-02-17
NJM2224
■
TERMINAL FUNCTION
PIN No.
PIN NAME
INSIDE EQUIVALENT CIRCUITS
PIN No.
PIN NAME
INSIDE EQUIVALENT CIRCUITS
1
CCD Input
5
Signal Bypass
2
CCD Output
6
Output
3
V
+
7
Control Input
4
GND
8
Input
Ver.2004-02-17
-3-
NJM2224
■
APPLICATION NOTE
The
NJM2224
is an integrated circuit of composing variable comb type filter which reduces noise mixed in chroma or
luminance signal of VCR camera and others. The CCD delay device is suitable for outside delay element composing
comb type filter, compared with a glass delay device. The basic circuit is the most excellent FB system with NULL.
Fig.1 is its basic block diagram and Fig.2 is actual block diagram of
NJM2224.
Fig.3 is one of application examples.
The video noise reducer system is composed of three capacitors for connection and one capacitor for signal bypass
and CCD delay device. The
NJM2224
is applicable to both of chroma and luminous signal using CCD delay device
suitable for each signal. High level input to the Control of Reduce/Enhance terminal (Pin 7) makes enhance mode
(increasing of high frequency part) and Low level input makes reduce mode (decreasing of high frequency part.) Its
threshold level is about 2.25V at 5V supply voltage. Basic operating characteristics is shown in Fig.4.
Fig.1 Basic Block Diagram
Fig.2 Block Diagram
Fig.3 Application
Fig.4 Basic Operating Characteristic
-4-
Ver.2004-02-17
NJM2224
The comb type filter has frequency characteristics shown Fig.5, and is widely used to separate luminance and color
signal in video-signal circuit. Using this comb type filter, the
NJM2224
reduces noise and enhances signal in video signal,
automatically.
Fig.6 shows video signal wave form and its frequency component.
Fig.5 Comb Type Filter Frequency Characteristic
Fig.6 Video Signal Waveform & Frequency Component
Ver.2004-02-17
-5-
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