TDA9111 datasheet(32/43 Pages) STMICROELECTRONICS

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TDA9111

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Due to the large output stage voltage range (E/W

Pin Cushion, Keystone, E/W Corner), the combi-

nation of the tracking function, maximum

vertical amplitude, maximum or minimum vertical

position and maximum gain on the DAC control

may lead to output stage saturation. This must be

avoided by limiting the output voltage with appro-

priate I2C register values.

For the E/W part and the dynamic horizontal

phase control part, a sawtooth-shaped differential

current in the following form is generated:

∆I’ = k’ . (VOUT - VDCMID)

Then

∆I and ∆I’ are added and converted into volt-

age for the E/W part.

Each of the three E/W components or the two dy-

namic horizontal phase control components may

be inhibited by their own I2C select bit.

The E/W parabola is available on Pin 24 via an

emitter follower output stage which has to be bi-

ased by an external resistor (10k

Ω to ground).

Since stable in temperature, the device can be DC

coupled with external circuitry (mandatory to ob-

tain H Size control).

The vertical dynamic focus is combined with the

horizontal focus on Pin 10.

The dynamic horizontal phase control drives inter-

nally the H-position, moving the HFLY position on

the horizontal sawtooth in the range of

± 2.8 %TH

both for side pin balance and parallelogram.

Figure 17. Geometric Corrections Principle

3.6 E/W

EWOUT = EWDC +K1 (VOUT - VDCMID)+

K2 (VOUT - VDCMID)

2+K3 (V

OUT - VDCMID)

K1 is adjustable by the keystone I2C register.

K2 is adjustable by the E/W amplitude I

2C register.

K3 is adjustable by the E/W corner I2C register.

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