NTE846
Integrated Circuit
TV Video Modulator
Description:
The NTE846 is designed to interface color difference, audio, and luminance signals to the antenna
terminals of a TV receiver. It consists of a sound subcarrier oscillator, chroma subcarrier oscillator,
quatrature chroma modulators, and RF oscillators and modulators for two lowVHF channels.
The NTE846 allows video information from VTR's test equipment, games, or similar sources to be
displayed on black and white or color TV receivers.
Features:
D
DC Channel Switching
D
Excellent Oscillator Stability
D
12V to 18V Supply Operation
D
Low Intermodulation Products
D
5V
pp
Chroma Reference Signal
D
May Be Used to Encode Composite Video
Absolute Maximum Ratings:
Supply Voltage
19V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(V
16
V
15
) Max
5V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(V
14
V
10
) Max
7V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(V
14
V
11
) Max
7V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation Package (Note 1), P
D
1390mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chroma Osc Current I
17
Max
10mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
0
to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
55
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10 seconds), T
L
+300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. For operation in ambient temperatures above 25
C, the device must be derated based on
a 150
C maximum junction temperature and a thermal resistance of 90
C/W junction to am-
bient.
DC Electrical Characteristics: (All SW Normally Pos. 1, V
A
= 15V, V
B
= 12V unless otherwise
specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max Unit
Supply Current
I
S
20
35
45
mA
Sound Oscillator, Current Change
I
15
Change V
A
from 12.5V to 17.5V
0.3
0.6
0.9
mA
Chroma Oscillator Balance
V
17
9.5
11.0
12.5
V
Chroma Modulator Balance
V
13
7.0
7.4
7.8
V
RY Modulator Output Level
V
13
SW 3: Pos. 2,
Change SW 1 from Pos. 1 to Pos. 2
0.6
0.9
1.2
V
BY Modulator Output Level
V
13
SW 3: Pos. 2,
Change SW 2 from Pos. 1 to Pos. 2
0.6
0.9
1.2
V
Chroma Modulator Conversion
Ratio
V
13
/
V
3
Divide
V
13
by
V
3
, SW 3: Pos. 2,
Change SW 0 from Pos. 1 to Pos. 2,
0.45
0.70
0.95
V/V
Channel A Oscillator
"OFF" Voltage
V
8
, V
9
SW 4: Pos. 2
0.5
1.5
3.0
V
Channel A Oscillator Curremt Level
I
9
V
B
= 12V, V
C
= 13V
2.5
3.5
5.0
mA
Channel B Oscillator
"OFF" Voltage
V
6
, V
7
SW 4: Pos. 2
0.5
1.5
3.0
V
Channel B Oscillator Curremt Level
I
6
V
B
= 12V, V
C
= 13V
2.5
3.5
5.0
mA
Channel A Modulator Conversion
Ratio
V
11
/(V
13
V
12
) SW 1, SW 2, SW 3: Pos. 2, V
B
= 12V,
Change V
C
from 13V to 11V for
V
11
,
Divide by V
13
V
12
0.35
0.55
0.75
V/V
Channel B Modulator Conversion
Ratio
V
10
/(V
13
V
12
) All SW: Pos. 2, V
B
= 12V, Change V
C
from 13V to 11V, Divide as Above
0.35
0.55
0.75
V/V
AC Electrical Characteristics: (V = 15V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Chroma Oscillator Output Level
V
17
C
LOAD
20pF
4
5
V
PP
Sound Carrier Oscillator Level
V
15
Loaded by RC Coupling Network
2
3
4
V
PP
Channel 3 RF Oscillator Level
V
8
, V
9
Ch SW: Pos. 3, f = 61.25MHz,
Use FET Probe
200
350
mV
PP
Channel 4 RF Oscillator Level
V
6
, V
7
Ch SW: Pos. 4, f = 67.25MHz,
Use FET Probe
200
350
mV
PP
PDF 
ZIP