TEA2031A_07 datasheet(2/11 Pages) STMICROELECTRONICS

2 / 11 page

TEA2031A

2/11

Figure 2. Pin Connections

Figure 3. Block Diagram

GENERAL DESCRIPTION

The TEA2031A is intended to provide to 110° color

TV sets a parabolic and keystone frame rate mod-

ulated correction in addition to the main horizontal

scanning.

A stable 6.3V internal reference provides current

and voltage references to the whole IC.

Pins 1 and 2 are two symmetrical inputs of an on-

chip multiplier circuit and are internally held at

6.3V reference potential level. Current inputs to

these pins are drawn from external sources via ap-

propriate resistors. The frame saw-tooth wave-

form which has a peak-to-peak value of around 3

volts and a mean value of about 2.5 volts, supplies

MULTIPLIER INPUT 1

CURRENT REFERENCE

GROUND

MULTIPLIER INPUT 2

COMPARATOR INPUT 2

MULTIPLIER OUTPUT AND COMPARATOR INPUT 1

OUTPUT

1 AND 2 CAN BE INVERTED

POWER SUPPLY

6.8mH

To DIODE

MODULATOR

123

VCC +24V

Multiplier

6.3V

VREF

K . (I1 - I2)

VCC

µA

Comparator

100

Ω

Line SAW-TOOTH

TEA2031A

120

µA

Frame

SAW-TOOTH

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