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 = +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 Nominal Supply 11.2V Nominal Dissipation 500mW Oscillator Stability Supply Variation 10–14 V 5Hz Variation with Temperature (∆T = +50°C) AFPC Characteristics DC Loop Gain Pull–In Range ACC Characteristic 100% Chroma Input Level 3dB Point 25Hz 33Hz/Degree ±500Hz 250mVp–p on Red Bar at 20% Nominal Input Level Hue–Control Range 100° Saturation–Control Range 40dB Min Demodulator Characteristics: Relative Amplitude Angle R–Y 1.0 93° B–Y 1.2 2° G–Y 0.3 258° Bandwidth (Chroma) 900kHz Flesh Control Primary Control in the +1 Half–Plane Chroma Overload Control Two Levels Picture Control 40dB Brightness Control Black Level Clamped on 3V to 5V Level Beam Limiting On Picture and Brightness Controls Luma Bandwidth 5MHz Min Sandcastle Input 1.2V to 2.3V Blanking > 3.3V Maximum Linear Output R Burst gate 5V G 3V B 3.7V Pin Connection Diagram Chroma Output 1 28 Beam Limiter Chroma Control 2 Chroma Input 3 27 Luminance 26 Picture Control Overload Filter 4 ACC, Killer Filter 5 25 Low Pass Filter 24 Bright Control ACC, Killer Filter 6 Sandcastle Pulse 7 23 VCC 22 Blue GND 8 APC Filter 9 21 Red 20 Green APC Filter 10 19 Q Carrier Input OSC Input 90° 11 OSC Input 180° 12 OSC Output 13 Tint Control 14 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)