NTE844 [NTE]
Integrated Circuit Single Chip TV Chroma/Luminance Processor; 集成电路的单芯片电视色度/亮度处理器
| 型号： | NTE844 |
| 厂家： | 
NTE ELECTRONICS |
| 描述： | Integrated Circuit Single Chip TV Chroma/Luminance Processor |
| 文件： | 总3页 (文件大小：24K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NTE844
Integrated Circuit
Single Chip TV Chroma/Luminance Processor
Description:
The NTE844 is an integrated circuit in a 28–Lead DIP type package and contains all the required cir-
cuits functions between the video detector and the picture tube RGB driver stages of a color television
receiver. The NTE844 decodes the chrominance signals and then produces three different color sig-
nals that are internally combined with the luminance to develop the RGB signals. The picture satura-
tion, hue and brightness DC controls are externally adjustable. The AFPC, ACC, Dynamic flesh con-
trol, Beam limiting and Gate black level (Brightness)control are servo loops used to stabilize the RGB
output and reduce frequent manual adjustment. The automatic beam limiter circuit reduces picture
contrast and brightness to prevent excessive drive output at the picture tube.
Features:
D All chroma processing and demodulating circuitry on a single chip.
D Phase–locked subcarrier regeneration utilizing sample–and–hold techniques.
D Supplementary ACC with overload detector
D Linear DC controls for chroma gain and tint
D Dynamic “flesh correction”
D Balanced chroma demodulators with low output impedance for direct coupling
D Internal RF filtering
D Few external components
D Automatic beam limiter
D Chroma luminance tracking picture control
Absolute Maximum Ratings:
DC Supply Voltage Between Pin23 and Pin8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.0V
Device Dissipation (Up to TA = +55°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.27W
Derate Above TA = +55°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3mW/°C
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Temperature (During Soldering, 1/16” from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265°C
Typical Performance Characteristics:
Function
Typical Data
11.2V
Nominal Supply
Nominal Dissipation
Oscillator Stability
500mW
Supply Variation 10–14
V
5Hz
Variation with Temperature
(∆T = +50°C)
25Hz
AFPC Characteristics
DC Loop Gain
33Hz/Degree
Pull–In Range
±500Hz
ACC Characteristic
100% Chroma Input Level
250mVp–p on Red Bar
at 20% Nominal Input Level
100°
3dB Point
Hue–Control Range
Saturation–Control Range
40dB Min
Relative
Amplitude
Demodulator Characteristics:
R – Y
Angle
1.0
93°
2°
B – Y
1.2
G – Y
0.3
258°
Bandwidth (Chroma)
Flesh Control
900kHz
Primary Control in the +1 Half–Plane
Two Levels
Chroma Overload Control
Picture Control
Brightness Control
Beam Limiting
40dB
Black Level Clamped on 3V to 5V Level
On Picture and Brightness Controls
5MHz Min
Luma Bandwidth
Sandcastle Input
1.2V to 2.3V
Blanking
> 3.3V
Burst gate
Maximum Linear Output
R
5V
G
B
3V
3.7V
Pin Connection Diagram
Chroma Output
1
2
3
4
5
28 Beam Limiter
Chroma Control
Chroma Input
27 Luminance
26 Picture Control
25 Low Pass Filter
24 Bright Control
Overload Filter
ACC, Killer Filter
ACC, Killer Filter
Sandcastle Pulse
6
7
23
V
22 Blue
CC
GND 8
21 Red
APC Filter
9
20 Green
APC Filter 10
19 Q Carrier Input
OSC Input 90°
11
18 I Carrier Input
OSC Input 180° 12
17 Demodulator Chroma Input
OSC Output 13
Tint Control 14
16 Overload, Flesh Disable
15 Carrier Output
14
15
1
28
1.469 (37.32) Max
.540
(13.7)
.250
(6.35)
.100 (2.54)
1.300 (33.02)
.122
(3.1)
Min
.600 (15.24)
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