DEFLECTION PROCESSOR FOR MULTISYNC MONITORS

S1D2512X01

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Then, S and C correction shapes can be added to this ramp. This frequency independent S and C corrections are

their select bit. The amplitude of this S and C corrected ramp can be adjusted by the vertical ramp amplitude

control register. The adjusted ramp is available on pin 23 (VOUT) to drive an external power stage. The gain of this

(vertical position). Its value is VPOS = 7/16

• V

Usually VOUT is sent through a resistive divider to the inverting input of the booster. Since VPOS derives from

accuracy (see application diagram).

Basic Equations

In first approximation, the amplitude of the ramp on pin 23 (Vout) is:

with:

•

•

•

VAMP = - 1 for minimum vertical amplitude register value and +1 for maximum

•

and +1 for maximum

The current available on pin 22 is:

f: synchronization frequency.

Vertical Moire

By using the vertical moire, VPOS can be modulated from frame to frame. This function is intended to cancel the

fringes which appear when line to line interval is very close to the CRT vertical pitch. The amplitude of the

modulation is controlled by register VMOIRE on address OC and can be switched - off via the control bit D7.

• V

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