NJM2259
- 1 -
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.
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
PACKAGE OUTLINE
NJM2259M
1
LPF
REGULATOR
VIDEO
CLAMP
GN
D
3
WHITE
CLIP
RF OSCILLATOR
REGULATOR
RF
MIXER
GN
D
2
OS
C
B
1
OS
C
E
1
OS
C
E
2
OS
C
B
2
VCC 2
VCC 3
5
4
3
2
8
7
6
16
12
13
14
15
9
10
11
AU
DI
O
I
N
TA
N
K
1
TA
N
K
2
P/
S
Ad
j
.
VCC 1
VI
DEO
I
N
GN
D
1
RF
O
U
T
AUDIO
SUBCARRIER
MODULATOR
NJM2259
- 2 -
ABSOLUTE MAXIMUM RATINGS (T
A
=25C)
Parameter Symbol Ratings Unit
Supply Voltage
V
CC
7 V
Power Dissipation
P
D
300 mW
Input Voltage
V
I
-0.3 to V
CC
V
Operating Temperature Range
T
opr
-20 to +75
C
Storage Temperature Range
T
stg
-40 to +125
C
RECOMMENDED OPERATING VOLTAGE RANGE (T
A
=25C)
Parameter Condition
Symbol
Min.
Typ.
Max.
Unit
Operating Voltage
V
CC
4.5 5.0 5.5 V
ELECTRICAL CHARACTERISTICS (V
CC
=5V,T
A
=25C)
Parameter Condition
Symbol
Min.
Typ.
Max.
Unit
Operating Current
No video/audio input signal
I
CC
18 30 32 mA
Video Output Level
(Note 1)
Video input Signal (Pin11)=0.5V
PP
V
O
(73) 78 (83) dBu
Video Modulation Depth
(Note 1)
Video input Signal (Pin11)=0.5V
PP
mp (60) 75 (90) %
Video Limiter Modulation
Depth (Note 1)
Video input Signal (Pin11)=0.5V
PP
mpmax (80) 94 (98) %
Differential Gain
Video input signal (Pin11)=0.5V
PP
Staircase
DG - 3
- %
Differential Phase
Video input Signal (Pin11)=0.5V
PP
Staircase
DP - 3
- deg
Picture-to-sound Ratio
(Note 1)
Video input Signal (Pin11)=0.5V
PP
PS (10) 13 (16) dB
Sound FM Modulation
Depth (Note 1)
Audio input Signal (Pin16)=70mV
PP
100%=50kHz dev.
ms (85) 100 (115) %
Audio Distortion
ms=100%,1kHz sine wave
THD
-
0.3
-
%
Audio Signal-to-noise
Ratio
ms=100%,1kHz sine wave
Video input Signal (Pin11)=1V
PP
ASN - 60 - dB
Maximum Sound FM
Modulation
Audio input Signal (Pin16)=500mV
PP
1kHz sine wave
msmax
- 700 - %
(Note 1) Because AC characteristics largely depends on application circuit, DC test is applied these parameters.
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