TDA9171 datasheet(2/20 Pages) PHILIPS

2 / 20 page

1996 Jun 17

Philips Semiconductors

Preliminary speciﬁcation

YUV picture improvement processor based

on histogram modiﬁcation and blue stretch

TDA9171

FEATURES

• Picture content dependent non-linear Y and U,V

processing by luminance histogram analysis

• TV standard independent

• Incredible blue stretch

• Optional YC-processing.

GENERAL DESCRIPTION

The TDA9171 is a transparent analog video processor

with YUV input and output interfaces.

The luminance transfer is controlled in a non-linear way by

the distribution, in 5 discrete histogram sections, of the

luminance values measured in a picture. As a result, the

contrast ratio of the most important parts of the scene will

be improved.

So as to maintain a proper colour reproduction the

saturation of the

−U and −V colour difference signals are

also controlled as a function of the actual non-linearity in

the luminance channel.

Optionally, the YUV blue stretch circuitry can be activated

which offsets colours near white towards blue.

The supply voltage is 8 V.

The device is contained in a 20 lead dual in-line package.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

VCC

supply voltage

7.2

−

8.8

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA9171

DIP20

plastic dual in-line package; 20 leads; (300 mil); no heat spreader

SOT146-1

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