TDA9115 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA9115' PDF : 45 Pages View PDF
TDA9115
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 I2C bus
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
Controls:
one-quadrant
two-quadrant
VDC-AMP (I2C)
Vmid(VOut)
2
VOut 23
32 VDyCor
Vertical ramp
PCC (I2C)
Tracking
HEHTIn/HSize
HSize
KEYST (I2C)
Tracking
with Hor
Frequency
PCAC (I2C)
17
HEHTIn
To horizontal
dyn. phase control
24 EWOut
PARAL (I2C)
30/45
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