TDA9115 datasheet(30/45 Pages) STMICROELECTRONICS

30 / 45 page

TDA9115

30/45

put vertical deflection drive waveform, they all

track with real vertical amplitude and position (in-

cluding breathing compensation), thus being fixed

vertically on the screen. They are also affected by

C- and S-corrections. The sum of components oth-

er than DC is affected by value in

HSIZE I2Cbus

control in reversed sense. Refer to electrical spec-

ifications for value. The DC value, adjusted via

HSIZE control, is also affected by voltage on HEH-

TIn input, thus providing a horizontal breathing

compensation (see electrical specifications for val-

ue). The resulting waveform is conditionally multi-

plied with voltage on HPLL1F, which depends on

frequency. Refer to electrical specifications for val-

ue and more precision. This tracking with frequen-

cy provides a rough compensation of variation of

picture geometry with frequency and allows to fix

the adjustment ranges of I2C bus controls through-

out the operating range of horizontal frequencies.

It can be switched off by EWTrHFr I2C bus bit (off

by default).

The EW waveform signal is buffered by an NPN

emitter follower, the emitter of which is directly

routed to EWOut output, with no internal resistor to

ground. It is to be biased externally.

Figure 12. Geometric corrections’ schematic diagram

Vertical ramp

Vmid(VOut)

To horizontal

dyn. phase control

EWOut

KEYST

PCC

VDC-AMP

VDyCor

Tracking

with Hor

Frequency

Tracking

HEHTIn/HSize

HEHTIn

HSize

Controls:

one-quadrant

two-quadrant

(I2C)

PCAC (I2C)

VOut

PARAL (I

2C)

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