RF Modulator for UHF Band

RF Modulator for UHF Band
NJM2259
RF Modulator for UHF Band
„ DESCRIPTION
The NJM2259 is a RF modulator IC especially designed for UHF
„ PACKAGE OUTLINE
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
AUDIO IN
TANK 1
TANK 2
P/S Adj.
VCC 1
VIDEO IN
GND 1
RF OUT
„ BLOCK DIAGRAM
16
15
14
13
12
11
10
9
AUDIO
SUBCARRIER
MODULATOR
VIDEO
CLAMP
REGULATOR
LPF
WHITE
CLIP
RF
MIXER
1
2
3
4
5
6
7
8
GND 2
OSC B1
OSC E1
OSC E2
OSC B2
VCC 2
VCC 3
REGULATOR
GND 3
RF OSCILLATOR
-1-
NJM2259
„ ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Supply Voltage
VCC
Power Dissipation
PD
Input Voltage
Operating Temperature Range
Storage Temperature Range
VI
Topr
Tstg
Ratings
7
300
(TA=25°C)
Unit
V
mW
-0.3 to VCC
-20 to +75
-40 to +125
„ RECOMMENDED OPERATING VOLTAGE RANGE
Parameter
Condition
Operating Voltage
Symbol
VCC
„ ELECTRICAL CHARACTERISTICS
Parameter
Condition
Symbol
Operating Current
No video/audio input signal
ICC
Video Output Level
VO
Video input Signal (Pin11)=0.5VPP
(Note 1)
Video Modulation Depth
mp
Video input Signal (Pin11)=0.5VPP
(Note 1)
Video Limiter Modulation
mpmax
Video input Signal (Pin11)=0.5VPP
Depth
(Note 1)
Video input signal (Pin11)=0.5VPP
Differential Gain
DG
Staircase
Video input Signal (Pin11)=0.5VPP
DP
Differential Phase
Staircase
Picture-to-sound Ratio
PS
Video input Signal (Pin11)=0.5VPP
(Note 1)
Sound FM Modulation
Audio input Signal (Pin16)=70mVPP
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)=1VPP
Maximum Sound FM
Audio input Signal (Pin16)=500mVPP
msmax
Modulation
1kHz sine wave
V
°C
°C
Min.
4.5
Typ.
5.0
Min.
18
Max.
5.5
(TA=25°C)
Unit
V
(VCC=5V,TA=25°C)
Typ.
Max.
Unit
30
32
mA
(73)
78
(83)
dBu
(60)
75
(90)
%
(80)
94
(98)
%
-
±3
-
%
-
±3
-
deg
(10)
13
(16)
dB
(85)
100
(115)
%
-
0.3
-
%
-
60
-
dB
-
700
-
%
(Note 1) Because AC characteristics largely depends on application circuit, DC test is applied these parameters.
-2-
NJM2259
„ TEST CIRCUIT
AUDIO IN
RF OUT
20k
6p
68p
P/S Adj.
VCC3
VIDEO IN
GND1
REG OUT
OSC E2
OSC B2
VCC2
VCC3
9
OSC E1
10
TANK2
11
OSC B1
12
TANK1
13
GND2
14
AUDIO IN
15
100p
1u
GND3
16
+
1
2
3
4
5
6
7
8
3p
100p
22p
50k
1p
1p
3p
VCC
100p
22p
50k
VCO
-3-
NJM2259
„ TERMINAL CHARACTERISTICS
Typ. DC
No.
Symbol
Voltage (V)
-4-
Equivalent Circuit
Function
1
GND 3
-
GND for
RF OSC AMP
2
GND 2
-
GND for RF OSC
3
4
5
6
OSC B1
OSC E1
OSC E2
OSC B2
2.55
1.75
1.75
2.55
RF Oscillator
7
VCC 2
-
8
VCC 3
-
9
RF OUT
3.95
RF Mixer Output
10
GND 1
-
GND Terminal
except for
RF Oscillator
11
VIDEO IN
1.70
Video Signal Input
RF OSC Regulator
Power Supply
RF Mixer
Power Supply
NJM2259
No.
Symbol
Typ. DC
Voltage (V)
12
VCC 1
-
13
P/S Adj.
3.55
TANK 1: H
2.80
TANK 1: L
Equivalent Circuit
Function
Power Supply
Picture-to-sound
Ratio Adjust
H : 3.60
14
TANK 2
L : 2.85
H : 3.60
15
Sound FM
Modulation Circuit
TANK 1
L : 2.85
16
AUDIO IN
-
Audio Signal Input
-5-
NJM2259
„ TYPICAL CHARACTERISTICS
TA=25°C
ICC vs VCC
VIDEO OUTPUT LEVEL vs VCC
84
50
45
82
40
Vo [ dBuV ]
ICC [ mA ]
35
30
25
20
80
78
15
10
76
5
0
74
4.0
4.5
5.0
5.5
6.0
6.5
7.0
4.0
4.5
5.0
VCC [ V ]
5.5
6.0
6.5
7.0
VCC [ V ]
VIDEO MODULATION DEPTH vs VCC
AUDIO FM MODULATION DEPTH vs VCC
125
80
120
115
78
76
βb [ % ]
mp [ % ]
110
74
105
100
95
90
85
72
80
70
75
4.0
4.5
5.0
5.5
VCC [ V ]
-6-
6.0
6.5
7.0
4.0
4.5
5.0
5.5
VCC [ V ]
6.0
6.5
7.0
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.
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