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:

● All chroma processing and demodulating circuitry on a single chip.

● Phase–locked subcarrier regeneration utilizing sample–and–hold techniques.

● Supplementary ACC with overload detector

● Linear DC controls for chroma gain and tint

● Dynamic “flesh correction”

● Balanced chroma demodulators with low output impedance for direct coupling

● Internal RF filtering

● Few external components

● Automatic beam limiter

● Chroma luminance tracking picture control