FUNCTIONAL DESCRIPTION (continued)

Table 1

FBLK OSD1 OSD2 OSD3 B6R8

Output

Signal (OUTn)

0

x

x

x

0

Video

1

x

x

x

0

OSD (1)

0

x

x

x

1

Video

10x

x

1

OSD

1

x

1

x

1

OSD

1

x

x

0

1

OSD

1

1

0

1

1

Semi-trans-

parent (2)

Notes : 1. All OSD colors are displayed.

2. One OSD color is displayed as semi-transparent video

without effect on brightness and DC level adjustment.

Output Stage

The three output stages incorporate three functions

which are :

- The blanking stage : When high level is applied

to the BLK input (Pin 14), the three outputs are

switched to a voltage which is 400mV lower than

the BLACK level. The black level is the output

voltage with minimum brightness when input

signal video amplitude is equal to ”0”.

- The output stage itself : It is a large bandwidth

on the three outputs (for 0.7V video signal on the

inputs). The typical bandwidth is 100MHz at -3dB

- The output CLAMP : The IC also incorporates

three internal output clamp (sample and hold

system) which allow to DC shift the three output

signals. The DC output voltage is adjustable

through I

level allow to adjust the BLK level

with 12 x 165mV.

The overall waveforms of the output signal ac-

cording to the different adjustment are shown in

Figures 3 and 4.

Serial Interface

The 2-wires serial interface is an I

The slave address of the TDA9206 is DC (in hexa-

decimal).

A6

A5

A4

A3

A2

A1

A0

W

110

111

00

Data Transfer

The host MCU can write data into the TDA9206

registers. Read mode is not available.

To write data into the TDA9206, after a start, the

MCU must send (see Figure 5) :

- The I

R/W bit.

- The byte of the internal register address where

the MCU wants to write data(s).

- The data.

All bytes are sent MSB bit first and the write data

transter is closed by a stop.

HSYNC

V

CONT

(4)

BPCP

BLK

Video IN

FBLK

OSD IN

V

OSD

(5)

V

BRT

(3)

V

BLACK

(2)

V

DC

(1)

CONT

OSD

BRT

0.4V fixed

V

Notes : 1.

V

2.

V

3.

V

4.

V

(CONT = 5V

5.

V

Figure 3 : Waveforms VOUT, BRT, CONT, OSD

TDA9206

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