OSD PWM1

OSD PWM2

OSD PWM3

OSD PWM4

OSD HS

OSD VS

OSD R

OSD G

OSD B

OSD FBLK

OSD PXCK

OSD B

OSD G

1

2

3

4

5

6

7

8

9

10

16

17

18

19

20

11

12

13

14

15

Q1

12MHz

C5

47pF

C4

47pF

OSD PWM4

OSD CKOUT

OSD PXCK

OSD VS

OSD HS

OSD PWM1

OSD FBLK

C3

100nF

R7

2.2k

Ω

OSD PWM2

OSD SCL

OSD SDA

OSD R

OSD PWM3

S1

Reset

Button

R3

2.2k

Ω

R4

2.2k

Ω

V

CC

4

3

2

1

J1

IC

2

1

6

11

2

7

12

3

8

13

4

9

14

5

10

15

VGA1 R

VGA1 G

VGA1 B

J2

to PC

1

6

11

2

7

12

3

8

13

4

9

14

5

10

15

VGA2 R

VGA2 G

VGA2 B

J3

PC mon

1

6

11

2

7

12

3

8

13

4

9

14

5

10

15

VGA3 R

VGA3 G

VGA3 B

J4

APPL mon

V-SYNC

R1

1k

Ω

C1

10

µF

4

5

6

12

13

11 OSD VS

R6

1k

Ω

R5

1k

Ω

H-SYNC

R2

1k

Ω

C2

10

µF

1

2

39

10

8

OSD HS

V

CC

U2A

74HC86

U2C

74HC86

U2D

74HC86

U2B

74HC86

C7

470

µF

C6

100nF

J5

J6

5V POWER SUPPLY

OSD CKOUT

TP1

TP2

TP3

TP4

TP5

TP6

TP7

TP8

TP9

TP10

TP11

TP12

TP13

TP14

TP15

V

CC

BC547B

T1

R17 10

Ω

R8 82

Ω

R9 75

Ω

R10 3.3k

Ω

R22 1.8k

Ω

D1

1N4148

S2

BC547B

T3

R19 10

Ω

R14 82

Ω

R15 75

Ω

R16 3.3k

Ω

R20 1.8k

Ω

D3

1N4148

S4

BC547B

T2

R18 10

Ω

R11 82

Ω

R12 75

Ω

R13 3.3k

Ω

R21 1.8k

Ω

D2

1N4148

S3

VGA1 R

VGA1 G

VGA1 B

VGA2 R

VGA2 G

VGA2 B

VGA3 R

VGA3 G

VGA3 B

OSD B

OSD G

OSD R

S

T

V

9

4

2

1

A demonstration board is available through your usual SGS-THOMSON Sales Office.

This demonstration board alllows to test very easily the STV9420/21 performances on any personnal computer. The board is delivered

together with a ”page maker” software which allows to easily generate pages of text or graphics on the PC monitor, or on a second monitor.

The I

together with demoboard. Of course, a small manual is also inside the kit.

DEMO KIT

STV9420 - STV9421

14/16