NJM2259
RF Modulator for UHF Band
DESCRIPTION
The NJM2259 is a RF modulator IC especially designed for UHF
band RF modulator and consists of video clamp circuit, white clip
circuit, video AM modulator and audio FM modulator, built into one
chip.
NJM2259M
FEATURES
•
•
•
•
•
•
•
Operating Voltage 5V
Picture-to-sound ratio is adjustable
Audio ripple is decreased by two internal regulators
Audio input circuit with low shock noise
Carrier-off switch function on chip
Bipolar Technology
Package Outline : DMP16
BLOCK DIAGRAM
AUDIO IN
VIDEO IN
PACKAGE OUTLINE
16
15
14
13
12
11
10
AUDIO
SUBCARRIER
MODULATOR
VIDEO
CLAMP
REGULATOR
LPF
WHITE
CLIP
RF
MIXER
RF OSCILLATOR
REGULATOR
1
GND 3
2
GND 2
3
OSC B1
4
OSC E1
5
OSC E2
6
OSC B2
7
VCC 2
VCC 3
RF OUT
P/S Adj.
TANK 1
TANK 2
GND 1
VCC 1
9
8
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NJM2259
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Supply Voltage
V
CC
Power Dissipation
P
D
Input Voltage
Operating Temperature Range
Storage Temperature Range
V
I
T
opr
T
stg
(T
A
=25°C)
Unit
V
mW
V
°C
°C
(T
A
=25°C)
Max.
Unit
5.5
V
Ratings
7
300
-0.3 to V
CC
-20 to +75
-40 to +125
RECOMMENDED OPERATING VOLTAGE RANGE
Parameter
Condition
Operating Voltage
Symbol
V
CC
Min.
4.5
Typ.
5.0
ELECTRICAL CHARACTERISTICS
Parameter
Condition
Symbol
Operating Current
No video/audio input signal
I
CC
Video Output Level
V
O
Video input Signal (Pin11)=0.5V
PP
(Note 1)
Video Modulation Depth
mp
Video input Signal (Pin11)=0.5V
PP
(Note 1)
Video Limiter Modulation
mpmax
Video input Signal (Pin11)=0.5V
PP
Depth
(Note 1)
Video input signal (Pin11)=0.5V
PP
Differential Gain
DG
Staircase
Video input Signal (Pin11)=0.5V
PP
DP
Differential Phase
Staircase
Picture-to-sound Ratio
PS
Video input Signal (Pin11)=0.5V
PP
(Note 1)
Sound FM Modulation
Audio input Signal (Pin16)=70mV
PP
ms
Depth
(Note 1) 100%=±50kHz dev.
Audio Distortion
ms=100%,1kHz sine wave
THD
Audio Signal-to-noise
ms=100%,1kHz sine wave
ASN
Ratio
Video input Signal (Pin11)=1V
PP
Maximum Sound FM
Audio input Signal (Pin16)=500mV
PP
msmax
Modulation
1kHz sine wave
Min.
18
(73)
(60)
(80)
-
-
(10)
(85)
-
-
-
(V
CC
=5V,T
A
=25°C)
Typ.
Max.
Unit
30
32
mA
78
75
94
±3
±3
13
100
0.3
60
700
(83)
(90)
(98)
-
-
(16)
(115)
-
-
-
dBu
%
%
%
deg
dB
%
%
dB
%
(Note 1) Because AC characteristics largely depends on application circuit, DC test is applied these parameters.
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