ML6427

13

Figure 9. Synchronizing the Filter Delay with Fast Blanking or Alpha-Key Signals in OSD Applications

DQ

OSD

(ON-SCREEN DISPLAY)

PROCESSOR

ML6431

GENLOCK/CLOCK

GENERATOR

ML6427

SCART/QUAD VIDEO

FILTER AND DRIVER

R

G

B

ROUTPUT

GOUTPUT

BOUTPUT

TO MUX OR

OTHER

PROCESSING

UNFILTERED

DELAY AT 13.5MHz IS APPROXIMATELY 74ns

FAST BLANKING INTERVAL

OR ALPHA-KEY SIGNAL

FAST BLANKING

INTERVAL

OR ALPHA-KEY

SIGNAL

13.5MHz/

27MHz

80ns±10ns DELAY

FILTERED

INPUTS

Bank A:

RGB, CV filtered path

Bank B:

RGB, CV filtered path

Other:

CV unfiltered path, Sync IN (slave mode)

Figure 10. Basic Application for PAL

OUTPUTS

Option 1: 2 CV outputs + 2 TV modulator outputs, 1 RGB output

Option 2: 2 CV outputs + 1 TV modulator output, 1 S-video output

Other:

Sync output (buffered stripped sync)

220µF

330pF

VIDEO CABLES

75

Ω

CV/Y

MODULATOR

220µF

75

Ω

R/Y

220µF

75

Ω

G/Y

220µF

75

Ω

B/C

H SYNC OUT

OPTIONAL FOR DC COUPLED APPLICATIONS

220µF

75

Ω

CV/Y

MODULATOR

CVOUT1/YOUTA

21

CVOUT2/YOUTB

20

ROUT/YOUTC

18

23

24

1

13

14

19

5

17

22

6

GOUT/YOUTD

16

BOUT/COUT

15

CVINFA/Y2

3

GINA/Y6

9

GINB/Y7

10

BINA/C1

11

BINB/C2

12

RINA/Y4

7

RINB/Y5

8

CVINFB/Y3

4

CVINU/Y1

2

SYNCIN

SYNCOUT

SWAP CVF SWAP CVU

A/B MUX

GNDO

VCCORGB VCCOCV

VCC

GND

ML6427

330pF