NTE846 [NTE]
Integrated Circuit TV Video Modulator; 集成电路电视视频调制器
| 型号： | NTE846 |
| 厂家： | 
NTE ELECTRONICS |
| 描述： | Integrated Circuit TV Video Modulator |
| 文件： | 总3页 (文件大小：25K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 low–VHF 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 5Vp–p Chroma Reference Signal
D May Be Used to Encode Composite Video
Absolute Maximum Ratings:
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19V
(V16–V15) Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5V
(V14–V10) Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
(V14–V11) Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Power Dissipation Package (Note 1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1390mW
Chroma Osc Current I17 Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to 150°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
Lead Temperature (During Soldering, 10 seconds), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +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, VA = 15V, VB = 12V unless otherwise
specified)
Parameter
Supply Current
Symbol
Test Conditions
Min Typ Max Unit
20 35 45 mA
0.3 0.6 0.9 mA
I
S
Sound Oscillator, Current Change
Chroma Oscillator Balance
Chroma Modulator Balance
R–Y Modulator Output Level
∆I
15
Change V from 12.5V to 17.5V
A
V
17
9.5 11.0 12.5
7.0 7.4 7.8
0.6 0.9 1.2
V
V
V
V
13
∆V
SW 3: Pos. 2,
Change SW 1 from Pos. 1 to Pos. 2
13
B–Y Modulator Output Level
∆V
SW 3: Pos. 2,
Change SW 2 from Pos. 1 to Pos. 2
0.6 0.9 1.2
V
13
Chroma Modulator Conversion
Ratio
∆V /∆V
Divide ∆V by ∆V , SW 3: Pos. 2,
0.45 0.70 0.95 V/V
0.5 1.5 3.0
13
3
13
3
Change SW 0 from Pos. 1 to Pos. 2,
Channel A Oscillator
V , V
SW 4: Pos. 2
V
8
9
“OFF” Voltage
Channel A Oscillator Curremt Level
I
V = 12V, V = 13V
2.5 3.5 5.0 mA
0.5 1.5 3.0
9
B
C
Channel B Oscillator
V , V
6
SW 4: Pos. 2
V
7
“OFF” Voltage
Channel B Oscillator Curremt Level
I
6
V = 12V, V = 13V
2.5 3.5 5.0 mA
B
C
Channel A Modulator Conversion ∆V /(V –V ) SW 1, SW 2, SW 3: Pos. 2, V = 12V, 0.35 0.55 0.75 V/V
11 13 12
B
Ratio
Change V from 13V to 11V for ∆V ,
C 11
Divide by V – V
13
12
Channel B Modulator Conversion ∆V /(V –V ) All SW: Pos. 2, V = 12V, Change V
0.35 0.55 0.75 V/V
10 13 12
B
C
Ratio
from 13V to 11V, Divide as Above
AC Electrical Characteristics: (V = 15V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Chroma Oscillator Output Level
Sound Carrier Oscillator Level
Channel 3 RF Oscillator Level
V
C
≤ 20pF
4
2
5
3
–
4
–
V
P–P
17
LOAD
V
15
Loaded by RC Coupling Network
V
P–P
V , V
8
Ch SW: Pos. 3, f = 61.25MHz,
Use FET Probe
200 350
mV
9
P–P
Channel 4 RF Oscillator Level
V , V
Ch SW: Pos. 4, f = 67.25MHz,
Use FET Probe
200 350
–
mV
6
7
P–P
Pin Connection Diagram
Chroma Lead
1
18 Chroma Lag
R – Y Input
2
3
17 Chroma OSC Output
16 Chroma Supply
Chroma Bias
B – Y Input
4
5
15 Sound Tank
14 RF Supply
GND
Ch B Tank
Ch B Tank
Ch A Tank
Ch A Tank
6
7
8
9
13 Chroma Subcarrier
12 Video Input
11 Ch A Output
10 Ch B Output
18
10
1
9
.870 (22.1) Max
.250
(6.35)
.150
(3.8)
.100 (2.54)
.800 (20.3)
.125 (3.17) Min
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