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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 circuits 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 signals that are internally combined with the luminance to develop the RGB signals. The picture saturation, hue and brightness DC controls are externally adjustable. The AFPC, ACC, Dynamic flesh control, 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 = +55C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.27W Derate Above TA = +55C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3mW/C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1/16" from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265C
Typical Performance Characteristics: Function Nominal Supply Nominal Dissipation Oscillator Stability Supply Variation 10-14 V Variation with Temperature (T = +50C) AFPC Characteristics DC Loop Gain Pull-In Range ACC Characteristic 100% Chroma Input Level 3dB Point Hue-Control Range Saturation-Control Range Demodulator Characteristics: R-Y B-Y G-Y Bandwidth (Chroma) Flesh Control Chroma Overload Control Picture Control Brightness Control Beam Limiting Luma Bandwidth Sandcastle Input 1.2V to 2.3V > 3.3V Maximum Linear Output R G B Typical Data 11.2V 500mW 5Hz 25Hz 33Hz/Degree 500Hz 250mVp-p on Red Bar at 20% Nominal Input Level 100 40dB Min Relative Amplitude 1.0 1.2 0.3 900kHz Primary Control in the +1 Half-Plane Two Levels 40dB Black Level Clamped on 3V to 5V Level On Picture and Brightness Controls 5MHz Min Blanking Burst gate 5V 3V 3.7V Angle 93 2 258
Pin Connection Diagram Chroma Output 1 Chroma Control 2 Chroma Input 3 Overload Filter 4 ACC, Killer Filter 5 ACC, Killer Filter 6 Sandcastle Pulse 7 GND 8 APC Filter 9 APC Filter 10 OSC Input 90 11 OSC Input 180 12 OSC Output 13 Tint Control 14 28 Beam Limiter 27 Luminance 26 Picture Control 25 Low Pass Filter 24 Bright Control 23 VCC 22 Blue 21 Red 20 Green 19 Q Carrier Input 18 I Carrier Input 17 Demodulator Chroma Input 16 Overload, Flesh Disable 15 Carrier Output
14
1
15
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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