STV9212 datasheet(12/34 Pages) STMICROELECTRONICS

12 / 34 page

Functional Description

STV9212

12/34

2.7

Video Insertion Pulse

The Video Insertion Pulse (VIP) creates an indent on the three video signals, timed with the positive

part of the BLKI signal. (See Section 2.2: Video Blanking on page 8). As its level is below the video

black level, it introduces a video “infra-black” level. The video infra-black level position versus

ground is then controlled in subsequent stages. In the absence of the blanking pulse on pin BLK,

the VIP is not inserted and the subsequent stages control the position of video black level.

Figure 12 shows the signal before and after insertion of the VIP. Two different VIP values are

programmable by bit

VIP. Refer to Section 4: Electrical Specifications for values.

2.8

Output Stage

The output stage consists of an output clamp and a buffer. If a reduced output video amplitude and/

or a reduced infra-black level range is sufficient in the application, the VCCP can be lowered to 5V.

Figure 11: Drive Control

Figure 12: VIP Insertion

Before Drive Stage

After Drive Stage

VRef

One I²C-bus register

DRIVEx (x=1, 2 or 3)

per video channel

Video Black Level

DRIVEx=max

DRIVEx=mid

DRIVEx=min

VIP insertion

Video before

BLKI signal

Video Black Level

VRef

VIP insertion

Video after

Video Black Level

VRef

VVIP

VRef+VVIP

Video Infra-black Level

Note: Identical for video channels 1, 2 and 3.

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