TDA9109A datasheet(36/47 Pages) STMICROELECTRONICS

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TDA9109A

36/47

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 two 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.

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

3.5 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 I2C register.

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

3.6 Dynamic Horizontal Phase Control

IOUT=K4 (VOUT - VDCMID) + K5 (VOUT - VDCMID)

K4 is adjustable by the parallelogram I2C register.

K5 is adjustable by the side pin balance I2C regis-

ter.

TDA9109A Datasheet(PDF) 36 Page - STMicroelectronics