ADV7192KST datasheet(17/69 Pages) AD

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ADV7192

–17–

REV. 0

FEATURES: FUNCTIONAL DESCRIPTION

BLACK BURST OUTPUT

It is possible to output a black burst signal from two DACs. This

signal output is very useful for professional video equipment

since it enables two video sources to be locked together. (Mode

BLACK BURST OUTPUT

CVBS

DIGITAL DATA

GENERATOR

ADV7192

DIGITAL DATA

GENERATOR

ADV7192

Figure 27. Possible Application for the Black Burst Output

Signal

BRIGHTNESS DETECT

This feature is used to monitor the average brightness of the

incoming Y video signal on a ﬁeld by ﬁeld basis. The information

is read from the I

2C and based on this information the color

saturation, contrast and brightness controls can be adjusted (for

example to compensate for very dark pictures). (Brightness Detect

CHROMA/LUMA DELAY

The luminance data can be delayed by maximum of six clock

cycles. Additionally the Chroma can be delayed by a maximum

of eight clock cycles (one clock cycle at 27 MHz). (Timing Reg-

ister 0 and Mode Register 9.)

CHROMA DELAY

LUMA DELAY

Figure 28. Chroma Delay

Figure 29. Luma Delay

CLAMP OUTPUT

The ADV7192 has a programmable clamp TTL output signal.

This clamp signal is programmable to the front and back porch.

The clamp signal can be varied by one to three clock cycles in a

positive and negative direction from the default position.

(Mode Register 5, Mode Register 7.)

CVBS

OUTPUT PIN

CLAMP

OUTPUT PIN

MR57 = 1

MR57 = 0

CLAMP O/P SIGNALS

Figure 30. Clamp Output Timing

CSO, HSO AND VSO OUTPUTS

The ADV7192 supports three output timing signals, CSO

(composite sync signal), HSO (Horizontal Sync Signal) and

VSO (Vertical Sync Signal). These output TTL signals are aligned

with the analog video outputs. See Figure 31 for an example

of these waveforms. (Mode Register 7.)

OUTPUT

VIDEO

525

23456789

11–19

EXAMPLE:- NTSC

CSO

HSO

VSO

Figure 31.

CSO, HSO, VSO Timing Diagram

COLOR BAR GENERATION

The ADV7192 can be conﬁgured to generate 100/7.5/75/7.5 color

bars for NTSC or 100/0/75/0 color bars for PAL.

(Mode Register 4.)

COLOR BURST SIGNAL CONTROL

The burst information can be switched on and off the composite

and chroma video output. (Mode Register 4.)

COLOR CONTROLS

The ADV7192 allows the user to control the brightness, contrast,

hue and saturation of the color. The control registers may be

double-buffered, meaning that any modiﬁcation to the registers

will be done outside the active video region and, therefore, changes

made will not be visible during active video.

Contrast Control

Contrast adjustment is achieved by scaling the Y input data by a

factor programmed by the user. This factor allows the data to be

scaled between 0% and 150%. (Contrast Control Register.)

Brightness Control

The brightness is controlled by adding a programmable setup level

onto the scaled Y data. This brightness level may be added onto

the Y data. For NTSC with pedestal, the setup can vary from

0 IRE to 22.5 IRE. For NTSC without pedestal and PAL, the

setup can vary from –7.5 IRE to +15 IRE. (Brightness Control

Color Saturation

Color adjustment is achieved by scaling the Cr and Cb input

data by a factor programmed by the user. This factor allows the

data to be scaled between 0% and 200%. (U Scale Register and

V Scale Register.)

Hue Adjust Control

The hue adjustment is achieved on the composite and chroma

outputs by adding a phase offset onto the color subcarrier in the

active video but leaving the color burst unmodiﬁed, i.e., only

the phase between the video and the colorburst is modiﬁed and

hence the hue is shifted. The ADV7192 provides a range of

± 22° in increments of 0.17578125°. (Hue Adjust Register.)

CHROMINANCE CONTROL

The color information can be switched on and off the com-

posite, chroma and color component video outputs. (Mode

ADV7192KST Datasheet(PDF) 17 Page - Analog Devices

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