STV2001 datasheet(32/46 Pages) STMICROELECTRONICS

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STV2001

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14.3.5 - E/W

EWOUT = EWDC + K1 (VOUT - VDCMID) +K2 (VOUT - VDCMID)

K1 is adjustable via the keystone I2C register. K2 is adjustable via the E/W amplitude I2C register.

14.3.6 - Dynamic Horizontal Phase Control

IOUT= K4 (VOUT - VDCMID) + K5 (VOUT - VDCMID)

K4 is adjustable via the parallelogram I2C register.

K5 is adjustable via the side pin balance I2C register.

14.3.7 - Vertical Dynamic Focus

Vertical Dynamic Focus waveform is available on

Pin 23. It is the parabolic waveform with down-

wards concavity, at vertical frequency. Its ampli-

tude is fixed at 1 Vpp.

14.3.8 - Corner Correction

There are 4 types of corner correction in the de-

vice: EW Corner Top, EW Corner Bottom, Corner

Phase Top and Corner Phase Bottom. EW Corner

Top and EW Corner Bottom are used to modulate

the EW amplitude. Corner Phase Top and Corner

Phase Bottom are used to modulate the Horizontal

Phase. These 4 types of correction are used to

compensate the distortion appearing at the cor-

ners of the CRT.

EW Corner Top and EW Corner Bottom correc-

tions add a half parabola current to the EW volt-

age. Since the E/W output voltage range is limited,

it was necessary to add EW Corner Correction to

decrease both EW amplitude and Keystone by

I2C.

Corner Phase Top and Corner Phase Bottom cor-

rections add a half parabola current to the Hori-

zontal Phase. Top and Bottom Corrections can be

adjusted separately by I2C with 7 Bits DAC.

14.3.9 - Horizontal Breathing

Horizontal breathing is performed through the EW

stage with V-I Converter and an I2C controlled var-

iable gain stage. This DC controlled input provides

the Horizontal Width correction required to offset

width changes due to EHT variation. Gain attenu-

ation is set by a 7 bits DAC with I2C.

14.3.10 - Vertical Breathing

Vertical breathing compensation is performed

through gain modulation of the vertical ramp. This

DC-controlled input allows the vertical height cor-

rections needed to offset height changes due to

EHT variations. Input is received at the output of

the EHT compensation Amplifier. Gain attenuation

is set by 6 Bits DAC via I2C.

PRE-AMPLIFIER PART

14.4 - GENERAL CONSIDERATIONS

14.4.1 - Input Stage

The R, G and B signals must be supplied to the

three inputs through coupling capacitors (100nF).

The maximum input peak-to-peak video amplitude

is 1 V.

The input stage includes a clamping function. This

clamp uses the input serial capacitor as "memory

capacitor" and is gated by an internally generated

"Back-Porch-Clamping-Pulse (BPCP)".

The BPCP is synchronized on the second edge of

the horizontal pulse HIN inputs on Pin 1.

Figure 16. .

In both cases, BPCP width is fixed.

HSYNC

BPCP

Internal pulse width is fixed at 1

µs

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