NJM2519A
- 1 -
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
BLOCK DIAGRA M
P ACKA GE OUTLINE
NJM2519AM
VCC
OS
C
REG OUT
4.5MHz
TA NK
VIDEO IN
RF OUT
GND
A UDIO IN
1234
5678
RF OSC REGULA TOR
CLA MP &
MIXER
A UDIO FM
MODULA TOR
WHITE CLIP
NJM2519A
- 2 -
ABSOLUTE MAXIMUM RATINGS (TA=25°C)
Parameter Symbol Ratings Unit
Supply Voltage VCC 7 V
Power Dissipation PD 300 mW
Input Voltage VI -0.3 to VCC V
Operating Temperature Range Topr -20 to +75 °C
Storage Temperature Range Tstg -40 to +125 °C
RECO MMENDE D OPERATING VO L TAGE RA NGE (T
A=25°C)
Parameter Condition Symbol Min. Typ. Max. Unit
Operating Voltage VCC 4.5 5.0 5.5 V
ELECTRICAL CHARACTERISTICS (VCC=5V,TA=25°C)
Parameter Condition Symbol Min. Typ. Max. Unit
Operating Current No video/audio input signal, ICC 11.5 15.3 19.1 mA
Video Output Level
(Note 1) Video input signal(Pin1)=0.5VPP V
O (83) 86 (89) dBu
Video Modulation Depth
(Note 1) Video input signal(Pin1)=0.5VPP mp (70) 76 (82) %
Video Limiter Modulation
Depth (Note 1)
Video input signal(Pin1)=1.0VPP
mpmax (88) 94 (98) %
Differential Gain Video input signal(Pin1)=0.5VPP
Staircase DG - ±3 - %
Differential Phase Video input signal(Pin1)=0.5VPP
Staircase DP - ±3 - deg
Picture-to-sound Ratio
(Note 1) Video input signal(Pin1)=0.5VPP PS (13) 16 (19) dB
Sound FM Modulation
Sensitivity Deviation of fs per 100mV βb - 0.51 - KHz/mV
Audio Distortion Audio input signal(Pin7)=0.05VPP
1kHz sine wave THD - 0.3 - %
Audio Signal-to-noise
Ratio
Sound Modulation 60%
1kHz sine wave ASN - 60 - dB
Maximum Sound FM
Modulation
Audio input signal(Pin7)=1.0VPP
1kHz sine wave msmax - 700 - %
(Note 1) Because AC characteristics largely depends on application circuit, these parameters are specified
by the DC characteristics as shown in next page.
NJM2519A
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3
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DC ELECTRICA L CHARA CTERISTICS (VCC=5V,TA=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
Amplitude 1 Gvv1=Gvvh-Gvvl Gvv 48 - 108 mV
Video Modulation Depth Mp=((Gvv-Mw)/Gvv)x100
where Mw=Mwh-Mwl Mp 66 - 78 %
Video Limiter Modulation
Depth (Note 2)
Mpmax=((Gvv-Wc)/Gvv)x100
where Wc=Wch-Wcl Mpmax 85 94 98 %
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 : RF OUT output voltage at Pin1
OSC(Pin8) input = Voso-0.3V
• Mwh : 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
NJM2519A
- 4 -
AC TEST CIRCUIT
DC TEST CIRCUIT
0.1u
1n
68p
VC
VCC
OSC
REG OUT
4.5MHz
TANK
VIDEO IN
RF OUT
GND
AUDIO IN
0.1u
+
1n
10p
8 7 6 5
1 2 3 4
0.1u1n
0.1u
VIDEO INRF OUT
AUDIO IN
75
1
0.1u
1n
1n
68p
VCC
VCC
OSC
REG OUT
4.5MHz
TANK
VIDEO IN
RF OUT
GND
AUDIO IN
0.1u1n
2 3 4
5678
NJM2519A
-
5
-
TERMINAL CHARACTERISTICS
No. Symbol Typ.DC
Voltage (V) Equivalent Circuit Function
1 RF OUT 4
RF Signal Output
2 GND -
GND
3 VIDEO IN 1.9
Video Signal Input
4 4.5MHz
TANK 2.9
4.5MHz Tank Coil
for Sound FM
Modulation Circuit
5 AUDIO IN 0.035
Audio Signal Input
6 VCC - Power Supply
4
2
3
6
2
6
2
6
5
6
1
2
NJM2519A
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6
-
No. Symbol Typ.DC
Voltage (V) Equivalent Circuit Function
7 REG OUT 4
Regulator Output
8 OSC 2.2
RF Oscillator Pin
2
6
8
2
6
7
NJM2519A
- 7 -
TYPICA L CHA RA CTERISTICS
TA=25°C
VCC vs ICC
0
5
10
15
20
25
30
0.0 2.0 4.0 6.0 8.0
VCC [ V ]
ICC [ mA ]
VCC vs VIDEO OUTPUT LEVEL
80
81
82
83
84
85
86
87
88
89
90
4.5 5.0 5.5 6.0 6.5 7.0
VCC [ V ]
Vo [ dBuV ]
USA3ch(61.25MHz)
USA4ch(67.25MHz)
VCC vs VIDEO MODULATION DEPTH
70
72
74
76
78
80
82
84
86
88
90
4.5 5.0 5.5 6.0 6.5 7.0
VCC [ V ]
mp [ % ]
USA3ch(61.25MHz)
USA4ch(67.25MHz)
VCC vs AUDIO FM SENSITIVITY
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
4.5 5.0 5.5 6.0 6.5 7.0
VCC [ V ]
βb [ kHz/mV ]
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
