NJM2536A
RF Modulator for VHF Band
DESCRIPTION
The NJM2536A 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.
NJM2536AV
FEATURES
•
Operating Voltage 5V
•
Picture-to-sound ratio is adjustable
•
VHF Oscillator on chip
•
Carrier-off switch function on chip
•
Regulator on chip
•
Bipolar Technology
•
Package Outline:DMP/SSOP14
BLOCK DIAGRAM
NJM2536AM
PACKAGE OUTLINE
REG OUT
CH SW
14
13
12
11
10
9
RF OSC
REGULATOR
CLAMP &
WHITE CLIP
MIXER
CARRIER
OFF SW
AUDIO FM
MODULATOR
1
VIDEO IN
2
CARRIER
OFF SW
3
ANT SW
DRIVE
4
RF OUT
5
GND1
6
P/S
AUDIO IN
4.5MHz
TANK
8
7
GND2
CH2
VCC
CH1
-1-
NJM2536A
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
22.5
4.3
0.1
(89)
(82)
(98)
-
-
(15)
-
-
-
-
mA
V
V
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
No video/audio input signal,
Operating Current
I
CC
CARRIER OFF SW(Pin2)=5V
ANT SW DRIVE
CARRIER OFF SW(Pin2)=5V
V
ANT1
Output Voltage –1
I
D
=26mA
ANT SW DRIVE
CARRIER OFF SW(Pin2)=Open
V
ANT2
Output Voltage –2
V
CC
=2V
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.
13.5
3.7
0
(83)
(70)
(85)
-
-
(11)
-
-
-
-
Typ.
16.0
4.0
0.065
86
76
94
±3
±3
13
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-
NJM2536A
DC ELECTRICAL CHARACTERISTICS
(V
CC
=5V,Pin2=2.5V, 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=Gvvh1-Gvvl1
Gvv1
62.4
85
124.5
mV
Amplitude 1
Video Output Signal
Gvv2=Gvvh2-Gvvl2
Gvv2
62.4
85
124.5
mV
Amplitude 2
Mp=((Gvv1-Mw)/Gvv1)x100
Video Modulation Depth
Mp
70
76
82
%
where Mw=Mwh-Mwl
Video Limiter Modulation Mpmax=((Gvv1-Wc)/Gvv1)x100
Mpmax
85
94
98
%
Depth
(Note 2) where Wc=Wch-Wcl
Picture-to-sound Ratio
Ps=Psh-Psl
Ps
-70
-45
-35.1
mV
(Note 2) Explanation of symbols
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Vv
:
VIDEO IN output voltage at Pin1
CH1 output voltage at Pin11
CH SW (Pin13) input = 2.5V
V11h :
V12h : CH1 output voltage at pin12
CH SW (Pin13) input = 0.5V
Gvvh1: RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv, CH1 (Pin11) = V11h + 0.15V, CH SW (Pin13) input = 2.5V
Gvvl1 : RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv, CH1 (Pin11) = V11h - 0.15V, CH SW (Pin13) input = 2.5V
Gvvh2 : RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv, CH2 (Pin12) = V12h + 0.15V, CH SW (Pin13) input = 0.5V
Gvvl2 : RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv, CH2 (Pin12) = V12h - 0.15V, CH SW (Pin13) input = 0.5V
Mwh :
RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv + 0.43V, CH1 (Pin11) = V11h + 0.15V, CH SW (Pin13) input = 2.5V
Mwl : RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv + 0.43V, CH1 (Pin11) = V11h - 0.15V, CH SW (Pin13) input = 2.5V
Wch : RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv + 0.8V, CH1 (Pin11) = V11h + 0.15V, CH SW (Pin13) input = 2.5V
Wcl
: RF OUT output voltage at Pin4
VIDEO IN (Pin 1) input = Vv + 0.8V, CH1 (Pin11) = V11h - 0.15V, CH SW (Pin13) input = 2.5V
VPs : P/S output voltage at Pin6
CARRIER OFF SW (Pin 2) input = 2.5V
Psh : RF OUT output voltage at Pin4
P/S (Pin 6) input = VPs + 0.2V, CH1 (Pin11) = 2.4V, CH SW (Pin13) input = 2.5V
Psl
: RF OUT output voltage at Pin4
P/S (Pin 6) input = VPs - 0.2V, CH1 (Pin11) = 2.4V, CH SW (Pin13) input = 2.5V
-3-
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