NTE844
Integrated Circuit
Single Chip TV Chroma/Luminance Processor
Description:
The NTE844 is an integrated circuit in a 28鈥揕ead 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鈥搇ocked subcarrier regeneration utilizing sample鈥揳nd鈥揾old techniques.
D
Supplementary ACC with overload detector
D
Linear DC controls for chroma gain and tint
D
Dynamic 鈥渇lesh correction鈥?/div>
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 T
A
= +55擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.27W
Derate Above T
A
= +55擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3mW/擄C
Operating Ambient Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +85擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Lead Temperature (During Soldering, 1/16鈥?from case, 10sec max), T
L
. . . . . . . . . . . . . . . . . +265擄C
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