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MAX9539EUI

Graphics Video Sync Adder/Extractor

Maxim Integrated 

Graphics Video Sync Adder/Extractor

MAX9540 Pin Description

PIN

1

2, 7, 12

3

4, 9, 10, 14,

15, 20, 25

5

6

8

11

13

16

17

18

19

21

22

23

24

26

27

28

NAME

IN_R

GND

REST_R

N.C.

I.C.

IN_G

REST_G

IN_B

REST_B

VSYNC

SP_V

OUT_B

VEE

CSYNC

SP_C

OUT_G

VCC

HSYNC

SP_H

OUT_R

FUNCTION

Red Video Input with Horizontal Sync

Ground

Red DC Restore. Connect a 1nF capacitor from REST_R to GND.

No Connection. Not internally connected.

Internally Connected. For best performance, connect this pin to GND.

Green Video Input with Composite Sync

Green DC Restore. Connect a 1nF capacitor from REST_G to GND.

Blue Video Input with Vertical Sync

Blue DC Restore. Connect a 1nF capacitor from REST_B to GND.

Vertical Sync Output

Vertical Sync Polarity Input

Blue Video Output

Negative Power-Supply Input. Bypass with a 0.1µF capacitor to GND.

Composite Sync Output

Composite Sync Polarity Input

Green Video Output

Positive Power-Supply Input. Bypass with a 0.1µF capacitor to GND.

Horizontal Sync Output

Horizontal Sync Polarity Input

Red Video Output

Detailed Description

The MAX9539/MAX9540 chipset provides a 3-wire

(RGB) interface for 5-wire (RGBHV) video by adding

and extracting the H, V, and composite sync from the

graphics video signals. This chipset eliminates the

problem of sync-to-video timing (skew errors) in a 5-

wire interface, while reducing the number of channels

required when transporting video signals.

The MAX9539 mixes the H and V sync signals and

adds them to create a 3-wire interface from a 5-wire

(RGBHV) input. The MAX9540 recovers the H and V

sync signals to create a 5-wire (RGBHV) interface from

the 3-wire input. The MAX9540 also provides a com-

posite sync output.

The chipset includes the MAX9539 sync adder and the

MAX9540 sync extractor with 180MHz large-signal

bandwidths to address display resolutions up to 1600 x

1200 at 85Hz for VGA-to-UXGA applications. Both

devices feature a DC-restore function, which virtually

eliminates any changes in black level. The chipset uses

a proprietary H and V sync addition/extraction scheme

(true sync) to minimize skew errors.

MAX9539 Sync Adder

The MAX9539 mixes the H and V sync signals and

adds them to create a 3-wire interface from a 5-wire

(RGBHV) input. Sync signals are added to the input

video signals. Horizontal sync is added to red video,

vertical sync is added to blue video, and composite

sync is added to green video. Composite sync is the

XOR function between H sync and V sync and is inter-

nally generated by the MAX9539. The sync level of the

video outputs is -2.4V. The DC-restore function

removes any DC offset (ΔVIN_RESTORE) in the RGB

video inputs and sets the output black level to 0V at the

back porch of the H sync. Therefore, the output black

level is set to 0V at the beginning of every line.

Figure 2 illustrates the functionality of the MAX9539. In

this example, the sync signals are of positive polarity.

MAX9540 Sync Extractor

The MAX9540 recovers the H and V sync signals to cre-

ate a 5-wire (RGBHV) interface from the 3-wire input. The

output video signals are obtained by removing the sync

pulses of the input video. The sync outputs correspond

to the sync pulses of the input video: horizontal sync is

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