NJM2519A
RF Modulator for VHF Band
DESCRIPTION
The NJM2519A is a RF modulator IC especially designed for VHF
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
•
VHF Oscillator on chip
•
Regulator on chip
•
Bipolar Technology
•
Package Outline: DMP8
NJM2519AM
PACKAGE OUTLINE
BLOCK DIAGRAM
REG OUT
OSC
8
7
6
RF OSC
REGULATOR
AUDIO FM
MODULATOR
MIXER
CLAMP &
WHITE CLIP
1
RF OUT
2
GND
3
VIDEO IN
4.5MHz
TANK
AUDIO IN
5
4
VCC
-1-
NJM2519A
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Supply Voltage
V
CC
Power Dissipation
P
D
Input Voltage
V
I
Operating Temperature Range
T
opr
Storage Temperature Range
T
stg
(T
A
=25°C)
Unit
V
mW
V
°C
°C
(T
A
=25°C)
Max.
Unit
5.5
V
(V
CC
=5V,T
A
=25°C)
Max.
Unit
19.1
mA
(89)
(82)
(98)
-
-
(19)
-
-
-
-
dBu
%
%
%
deg
dB
KHz/mV
%
dB
%
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(Pin1)=0.5V
PP
(Note 1)
Video Modulation Depth
mp
Video input signal(Pin1)=0.5V
PP
(Note 1)
Video Limiter Modulation Video input signal(Pin1)=1.0V
PP
mpmax
Depth
(Note 1)
Video input signal(Pin1)=0.5V
PP
Differential Gain
DG
Staircase
Video input signal(Pin1)=0.5V
PP
DP
Differential Phase
Staircase
Picture-to-sound Ratio
PS
Video input signal(Pin1)=0.5V
PP
(Note 1)
Sound FM Modulation
Deviation of fs per 100mV
βb
Sensitivity
Audio input signal(Pin7)=0.05V
PP
Audio Distortion
THD
1kHz sine wave
Audio Signal-to-noise
Sound Modulation 60%
ASN
Ratio
1kHz sine wave
Maximum Sound FM
Audio input signal(Pin7)=1.0V
PP
msmax
Modulation
1kHz sine wave
Min.
11.5
(83)
(70)
(88)
-
-
(13)
-
-
-
-
Typ.
15.3
86
76
94
±3
±3
16
0.51
0.3
60
700
(Note 1) Because AC characteristics largely depends on application circuit, these parameters are specified
by the DC characteristics as shown in next page.
-2-
NJM2519A
DC ELECTRICAL CHARACTERISTICS
(V
CC
=5V,T
A
=25°C, otherwise noted. All measurements performed in
the DC test circuit are shown in next page)
Parameter
Condition
(Note 2) Symbol Min.
Typ.
Max.
Unit
Video Output Signal
Gvv1=Gvvh-Gvvl
Gvv
48
-
108
mV
Amplitude 1
Mp=((Gvv-Mw)/Gvv)x100
Video Modulation Depth
Mp
66
-
78
%
where Mw=Mwh-Mwl
Video Limiter Modulation Mpmax=((Gvv-Wc)/Gvv)x100
Mpmax
85
94
98
%
Depth
(Note 2) where Wc=Wch-Wcl
Picture-to-sound Ratio
Ps=20log(Gvv/(Gva/2))
Ps
8
-
18
dB
(Note 2) Explanation of symbols
•
•
•
•
•
•
•
•
•
Vv
:
VIDEO IN output voltage at Pin3
Voso : OSC output voltage at Pin8
Gvvh : RF OUT output voltage at Pin1
OSC(Pin8) input = Voso+0.3V
Gvvl :
Mwh :
RF OUT output voltage at Pin1
OSC(Pin8) input = Voso-0.3V
RF OUT output voltage at Pin1
OSC (Pin 8) input = Voso+0.3V,VIDEO IN(Pin3) input=Vv + 0.41V
Mwl : RF OUT output voltage at Pin1
OSC (Pin 8) input = Voso-0.3V,VIDEO IN(Pin3) input=Vv + 0.41V
Wch : RF OUT output voltage at Pin1
OSC (Pin 8) input = Voso+0.3V,VIDEO IN(Pin3) input=Vv + 0.75V
Wcl
: RF OUT output voltage at Pin1
OSC (Pin 8) input = Voso-0.3V,VIDEO IN(Pin3) input=Vv + 0.75V
Gva : RF OUT output level at Pin1(4.5MHz Sine wave [peak to peak])
OSC(Pin8) input = Voso+0.6V
-3-
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