NTE856
Integrated Circuit
TV Video Modulation Circuit
Description:
The NTE856 is an RF oscillator and dualinput modulator in an 8Lead DIP type package designed
to generate a TV signal from baseband video inputs. Typical applications include video games, home
computer display, video recorders, and test equipment.
The very low level of intermodulation products, compact package and small external component
count make this device superior to simple discrete circuits.
Features:
D
Single 5V Supply
D
Channel 3 or 4 Operation
D
Excellent Oscillator Stability to 100MHz
D
Color and Sound Compatibility
D
Dual Input Modulator for Ease of Signal
D
Low Intermodulation (50dB 920kHz Beat)
D
Overmodulation Protection
Absolute Maximum Ratings:
Supply Voltage
8V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation Package
1.25W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate above 25
C
13mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Junction Temperature
+150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Ambient Temperature Range
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions:
Supply Voltage
5V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Luma Input Voltage
Sync Tip
1V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak White
0.35V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (V
CC
= 5V, T
A
= +25
C unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Operating Supply Voltage
4.75
5.0
5.25
V
Supply Current
12
mA
RF Modultor
Luma Input Dynamic Range (Pin4)
0
1.5
V
RF Output Voltage
f = 67.25MHz, V4 = 1V
15
mV
rms
Luma Conversion Gain
V7/
V4, V4 = 0.1V to 1V
0.8
V/V
Chroma Conversion Gain
V7/
V5, V5 = 1.5V
PP
, V4 = 1V
0.95
V/V
Chroma Linearity (Pin7)
V5 = 1.5V
PP
1.0
%
Luma Linearity (Pin7)
V4 = 0 to 1.5V
2.0
%
Input Current (Pin4)
20
A
Input Resistance (Pin5)
800
Input Resistance (Pin4)
100
k
Input Capacitance (Pin4, Pin5)
5.0
pF
Residual 920kHz
Measured at Pin7, Note 1
60
dB
Output Current (Pin7)
V4 = 0
1.5
mA
Temperature Characteristics (V
CC
= 7V, T
A
= 0
to +70
C, IC only)
RF Oscillator Deviation
f
o
= 67.265MHz
Note 1. RF Reference Level = 6.0mV at Pin7. Load Impedance = 75
.
RF + 4.5MHz = 13dB.
RF + 3.58MHz = 20dB.
V
CC
Pin Connection Diagram
Sound/Chroma Input
N.C.
1
2
3
4
RF Tank
RF Tank
GND
Video Input
8
7
6
5
RF Output
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