TDA9106A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TDA9106A

LOW COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS

STMicroelectronics 

Prev 21 22 23 24 25 26 27 28 29 30

TDA9106A

OPERATING DESCRIPTION (continued)

Figure 18

Horizontal Flyback

Internal Trigged

Horizontal Flyback

Horizontal Focus

Cap Sawtooth

Horizontal Dynamic

Focus Parabola

Output

400ns

Moire Output

4.7V

2V

2V

II.6 - Horizontal Dynamic Focus

TDA9106A delivers an horizontal parabola wave

form on Pin 17. This parabola is performed from a

sawtoothin phasewith flyback pulse.Thissawtooth

is present on Pin 16 where the horizontal focus

capacitor is the same as C0 to obtain a controlled

amplitude (from 2 to 4.7V typically).

Symmetry(keystone)and amplitude are I2C adjust-

able (see Figure 18).This signal has to be con-

nected to the CRT focusing grids and mixed with

vertical dynamic focus.

Figure 19 : Moire Function Block Diagram

II.7 - Moire Output

The moire output is intented to correct a beat

between horizontal video pixel period and actual

CRT pixel width.

The moire signal is a combinationof Horizontal and

Vertical frequency signals.

To achieve a moire cancellation, it has to be con-

nected to any point on the chassis controlling the

horizontalposition.We recommend to introducethis

H-FLY

Ck

Q

D Rst Q

23

V-SYNC

Monostable

Ck

Q

D

Q

Figure 20 : Moire Output Waveform

EVEN FRAME

H

V

MOIRE

ODD FRAME

H

V

MOIRE

23/30

Share Link: