STV5730 datasheet(14/19 Pages) STMICROELECTRONICS

14 / 19 page

be built with no SECAM chroma re-insertion filter

and no additional control switches.

The sum may be cancelled by setting the M8 mode

bit. In this case, the VIDEO OUT2 pin is in high

impedance state and the resistor network delivers

VIDEO OUT1 only.

When using the resistor network, please set M8 in

the following cases :

- in full page mode

- when OSD in not displayed

- to select opaque text. This allows the viewer to

select by software the preferred display mode.

The DC levels of the VIDEO OUT1, VIDEO OUT2

and the sum signals are high enough to directly

drive a NPN emitter follower driver (see Table 1).

9 - VIDEO FULL PAGE MODE

In addition to the normal full page mode in which a

uniformely colored screen background is gener-

ated, the STV5730 is able to support a ”video full

page mode”.

Normal and video full page mode are selected by

the control bit C11 (respectively set high and low).

By using the video full page mode the channel

capture operation can be easily monitored on the

screen since the signal at the VIDEO IN input is

displayed, unlocked, in the screen background

area ; the text being stable and colored, with or

without colored background.

Presence detection is permanently active to keep

the microcontroller informed of the input signal

quality. The information is delivered by the MUTE

pin.

This information can be used by the microcontroller

to force the STV5730 into the mixed mode (set C0

low) when the input signal becomes good enough.

In the video full page mode, it can be usefull to set

the M11 (mode register) bit high, so that the mute

signal is not synchronized on the vertical sync, thus

accelerating the VIDEO IN presence detection.

10 - S-VHS APPLICATION (see Figure 5)

The STV5730 can be used in S-VHS applications

easily.

The Y signal must be delivered to the VIDEO IN

input. The VIDEO OUT1 output then delivers a

Y + text signal, whilst the VIDEO OUT2 delivers the

Y input signal, provided that the CIN input is con-

nected to a bias DC level.

An external switch must be used to select the C

signal in mixed mode or the COUT output signal in

full page mode.

In mixed mode the chroma signal (C) can be exter-

nally attenuated (multistandard translucent opera-

tion) or killed (PAL/NTSC opaque operation only)

during the character gate controlled by the fast

blanking signal.

Table 1

FULL PAGE

PAL/NTSC

MIXED MODE

TRANSLUCENT PAL/NTSC/SECAM

OPAQUE PAL/NTSC

VIDEO OUT1

CVBS (OSD)

VIDEO IN or Text

VIDEO OUT2

High impedance

VIDEO IN

High Impedance

CVBS

(OSD)

VIDEO IN or

R2 x Text

+ R1 x VIDEO IN

+ R2

VIDEO IN

or Text

CHARACTER

GATED

ATTENUATOR

EXTERNAL

SWITCH

CIN

Mixed Mode (MM)

Full Page Mode (FP)

COUT

STV5730

VIDEO IN

VIDEO OUT1

VIDEO OUT2

INTERNAL BIAS

OPTIONAL

FILTER

YOSD

Y or Text

Yor

Full page mode

Opaque mixed mode

Translucent mixed mode

R 2

R 1

R 2 * Text R 1 * Y

R 2

Figure 5 :

S-VHS Input/Output Configuration

STV5730

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