TDA4841PS datasheet(10/60 Pages) PHILIPS

10 / 60 page

1999 Oct 25

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4841PS

Adjustment of vertical position, vertical linearity and

vertical linearity balance

output VOUT1 and VOUT2 (pins 13 and 12) without

affecting any other output waveform. This adjustment is

meant for factory alignments.

VOUT1 and VOUT2 with correct tracking of all other

related waveforms (see Section “Tracking of vertical

adjustments”). This register should be used for user

adjustments. Due to the tracking the whole picture moves

vertically while maintaining the correct geometry.

S-correction in the output signal. This function can be

switched off by control bit VSC.

vertical S-correction in the output signal.

Tracking of vertical adjustments

The adjustments via registers VSIZE, VOVSCN and

VPOS also affect the waveforms of horizontal pincushion,

vertical linearity (S-correction), vertical linearity balance,

focus parabola, pin unbalance and parallelogram

correction. The result of this interaction is that no

readjustment of these parameters is necessary after an

user adjustment of vertical picture size and vertical picture

position.

Adjustment of vertical moire cancellation

To achieve a cancellation of vertical moire (also known as

‘scan moire’) the vertical picture position can be modulated

by half the vertical frequency. The amplitude of the

modulation is controlled by register VMOIRE and can be

switched off via control bit MOD.

Horizontal pincushion (including horizontal size,

corner correction and trapezium correction)

EWDRV (pin 11) provides a complete EW drive waveform.

The components horizontal pincushion, horizontal size,

corner correction and trapezium correction are controlled

by the registers HPIN, HSIZE, HCORT, HCORB and

HTRAP.

The corner correction can be adjusted separately for the

top (HCORT) and bottom (HCORB) part of the picture.

The pincushion (EW parabola) amplitude, corner and

trapezium correction track with vertical picture size

(VSIZE) and also with the adjustment for vertical picture

position (VPOS). The corner correction does not track with

horizontal pincushion (HPIN).

Further the horizontal pincushion amplitude, corner and

trapezium correction track with the horizontal picture size,

which is adjusted via register HSIZE and the analog

modulation input HSMOD. If the DC component in the

EWDRV output signal is increased via HSIZE or IHSMOD,

the pincushion, corner and trapezium component of the

EWDRV output will be reduced by a factor of

The value 14.4 V is a virtual voltage for calculation only.

The output pin can not reach this value, but the gain (and

DC bias) of the external application should be such that the

horizontal deflection is reduced to zero when EWDRV

would reach 14.4 V.

HSMOD (pin 31) can be used for a DC controlled EHT

compensation by correcting horizontal size, horizontal

pincushion, corner and trapezium. The control range at

this pin tracks with the actual value of HSIZE. For an

increasing DC component VHSIZE in the EWDRV output

signal, the DC component VHEHT caused by IHSMOD will be

reduced by a factor of

as shown in the equation

above.

The whole EWDRV voltage is calculated as follows:

with

and

HSIZE

HEHT 1

HSIZE

14.4 V

-----------------

–





14.4 V

-------------------------------------------------------------------------

–

HSIZE

14.4 V

-----------------

–

EWDRV,0

1.2 V

HSIZE

HEHT

f HSIZE

()

HPIN

HCOR

HTRAP

() g HSIZE,HSMOD

()

⋅

[

]

HREF

()

⋅

HEHT

HSMOD

120

µA

-------------------- 0.69

⋅

f HSIZE

()

HSIZE

14.4 V

-----------------

–

g HSIZE,HSMOD

()

HSIZE

HEHT 1

HSIZE

14.4 V

-----------------

–





14.4 V

-------------------------------------------------------------------------

–

HREF

()

HREF

70 kHz

-------------------------------------

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