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NTE7134

Integrated Circuit Horizontal and Vertical Deflection Controller for Monitors

NTE Electronics 

Functional Description (Cont’d):

Adjustment of Vertical Size, Vertical Shift and S–Correction (Cont’d)

The adjustments for vertical size and vertical shift also affect the wavweforms of the EW parabola and

the vertical S–correction. The result of this interaction is that no readjustment of these parameters

is necessary after an adjustment of vertical picture size or position.

Application hint: VPOS is a current input which provides an internal reference voltage while IVPOS

is in the specified adjustment current range. By grounding VPOS (Pin17) the symmetrical control

range is forced to its center value.

Application hint: VSCOR is a current input at 5V. Superimposed on this level is a very small posi-

tive–going vertical sawtooth, intended to modulate an external long–tailed transistor pair. This en-

ables further optional DC controls of functions which are not directly accessible such as vertical tilt

or vertical linearity.

EW Parabola (Including Horizontal Size and Trapezium Correction)

EWDRV (Pin11) provides a complete EW drive waveform. EW parabola amplitude, DC shift (horizon-

tal size) and trapezium correction can be controlled via separate DC inputs.

EWPAR (Pin21) is used to adjust the parabola amplitude. This can be a combination of a DC adjust-

ment and a dynamic waveform modulation.

The EW parabola amplitude also tracks with vertical picture size. The parabola waveform itself tracks

with the adjustment for vertical picture shift (VPOS).

EWWID (Pin32) offers two modes of operation:

Mode 1

Horizontal size is DC controlled via EWWID (Pin32) and causes a DC shift at the EWDRV

output. Also the complete waveform is multiplied internally by a signal proportional to the

line frequency (which is detected via the current at HREF (Pin28). This mode is to be used

for driving EW modulator stages which require a voltage proportional to the line frequency.

Mode 2

EWWID (Pin32) is grounded. Then EWDRV is no longer multiplied by the line frequency.

The DC adjustment for horizontal size must be added to the input of the B+ control amplifier

BIN (Pin5). This mode is to be used for driving EW modulations which require a voltage

independent of the line frequency.

EWTRP (Pin20 is used to adjust the amount of trapezium correction in the EW drive waveform.

Application hint: EWTRP (Pin20) is a current input at 5V. Superimposed on this level is a very small

vertical parabola with positive tips, intended to modulate an external long–tailed transistor pair. This

enables further optional DC controls of functions which are not directly accessible such as EW–cor-

ner, vertical focus or EW pin balance.

Application hint: By grounding EWTRP (Pin20) the symmetrical control range is forced to its center

value.

B+ Control Function Block

The B+ control function block of the EASDC consists of an Operatgional Transcondutance Amplifier

(OTA), a voltage comparator, a flip–flop and a discharge circuit. This configuration allows easy ap-

plications for different B+ control concepts.

General Description

The non–inverting input of the OTA is connected internally to a high precision reference voltage. The

inverting input is connected to BIN (Pin5). An internal clamping circuit limits the maximum positive

output voltage of the OTA. The output itself is connected to BOP (Pin3) and to the inverting inpuyt of

the voltage comparator. The non–inverting input of the voltage comparator can be accessed via

BSENS (Pin4).

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