TDA9110 datasheet(20/29 Pages) STMICROELECTRONICS

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OPERATING DESCRIPTION (continued)

Horizontal Flyback

Internal Trigged

Horizontal Flyback

Horizontal Focus

Cap Sawtooth

Horizontal Dynamic

Focus Parabola

Output

4.7V

400ns

Moire Output

860ns

Figure 17

II.7 - Moire Output

The moire output is intented to correct a beat

between the horizontal video pixel period and the

current CRT pixel width.

The moire signal is a combination of the Horizontal

and the Vertical frequency signals.

To achieve a moire cancellation, the moire output

has to be connected to any point of the chassis

controlling the horizontal position. We recommend

to introduce this “ Horizontal Controlled Jitter” on

the relative ground of PLL2 capacitor where this

“controlled jitter” frequency type will directly affect

the horizontal position.

The amplitude of the signal is I

2C adjustable.

If the H-Moire feature is not necessary in the appli-

cation, the H-Moire output (Pin 3) can be used as

a 5 bits DAC output (0.3V to 2.2V). If the H-Moire

output is not used at all, so the Pin 3 must be either

kept to high impedance or grounded via a resistor.

TDA9110

20/29

TDA9110 Datasheet(PDF) 20 Page - STMicroelectronics