TDA9109N datasheet(23/32 Pages) STMICROELECTRONICS

23 / 32 page

OPERATING DESCRIPTION (continued)

For the E/W part and the dynamic horizontal phase

control part, a sawtooth-shapeddifferential current

in the following form is generated :

DI’ = k’

⋅ (VOUT -VDCMID)

Then

∆I and ∆I’ are added and converted into

voltage for the E/W part.

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

namic horizontal phase control ones may be inhib-

ited by their own I

2C 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 an 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

± 1.4% TH

both for side pin balance and parallelogram.

EW Output

EW Amp

Keystone

Sidepin Amp

Parallelogram

Dynamic Focus

Sidepin Balance

Output Current

To Horizontal

Phase

DCMID (3.5V)

Vertical Ramp VOUT

V.Focus

Amp

HORIZONTAL

DYNAMIC FOCUS

Parabola

Generator

DCMID

(3.5V)

DCMID

(3.5V)

Figure 17 : Geometric Corrections Principle

III.6 - E/W

EWOUT = 2.5V + K1 (VOUT -VDCMID) + K2 (VOUT -VDCMID)

K1 is adjustable by the keystone I

2C register

K2 is adjustable by the E/W amplitude I

2C register

III.7 - Dynamic Horizontal Phase Control

IOUT =K3 (VOUT -VDCMID) + K4 (VOUT -VDCMID)

K3 is adjustable by the parallelogram I

2C register

K4 is adjustable by the side pin balance I

2C register

TDA9109/N

23/32

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