TDA9111 datasheet(29/43 Pages) STMICROELECTRONICS

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TDA9111

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Figure 15. Phase of HFocus Parabola

2.7 Horizontal Moiré Output

The Horizontal Moiré output is intended to correct

a beat between the horizontal video pixel period

and the CRT pixel width.

The Moiré signal is a combination of the horizontal

and vertical frequency signals.

To achieve a Moiré cancellation, the Moiré output

has to be connected so as to modulate the hori-

zontal position. We recommend introducing this

“Horizontal Controlled Jitter” on the ground side of

PLL2 capacitor where this “controlled jitter” will di-

rectly affect the horizontal position.

The amplitude of the signal is I2C adjustable. The

H-Moiré frequency can be chosen via the I

2C.

When sub-address 11 D8=0, Fh is divided by 4.

This is recommended for separate scanning and

EHV. When D8=1, Fh is divided by 2, which gives

a better aspect in the case of common scanning

and EHV. The H-Moiré output is combined with the

PLL1 horizontal unlock output.

If HMoiré/HLock is selected:

– when PLL1 is unlocked, pin 3 output voltage

goes above 6V.

– when PLL1 is locked, the HMoiré signal (up to

2.2V peak) is present on pin 3.

If HMoiré/HLock is not selected, pin 3 can be used

as a 0....2.5V DAC.

0.16TH

0.475TH

127

I2C Code

(decimal)

0.6

µs

0.6

µs

0.4

µs

Flyback pulse

H Focus sawtooth

H Focus parabola

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