MAX4397 datasheet(18/30 Pages) MAXIM

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Power Supplies and Bypassing

The MAX4397 features single 5V and 12V supply opera-

tion and requires no negative supply. The +12V supply

V12 is for the SCART switching function. For pin V12,

place all bypass capacitors as close as possible with a

10µF capacitor in parallel with a 0.1µF ceramic capacitor.

Connect all VAUD pins together to +5V and bypass with a

10µF electrolytic capacitor in parallel with a 0.47µF low-

ESR ceramic capacitor to audio ground. Bypass VAUD

pins with a 0.1µF capacitor to audio ground. Bypass

AUD_BIAS to audio ground with a 10µF electrolytic in

parallel with a 0.1µF ceramic capacitor.

Bypass VDIG with a 0.1µF ceramic capacitor to digital

ground. Bypass each VVID to video ground with a 0.1µF

ceramic capacitor. Connect VVID in series with a 200nH

ferrite bead to the +5V supply.

Layout and Grounding

For optimal performance, use controlled-impedance

traces for video signal paths and place input termina-

tion resistors and output back-termination resistors

close to the MAX4397. Avoid routing video traces par-

allel to high-speed data lines.

The MAX4397 provides separate ground connections

for video, audio, and digital supplies. For best perfor-

mance, use separate ground planes for each of the

ground returns and connect all three ground planes

together at a single point. Refer to the MAX4397 evalu-

ation kit for a proven circuit board layout example.

Audio/Video Switch for Dual SCART Connectors

______________________________________________________________________________________

ADDRESS

(HEXADECIMAL)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

00h

TV volume

bypass

ZCD

TV volume control

TV audio

output mute

01h

VCR volume control

Not used

VCR audio selection

TV audio selection

02h

Not used

03h

Not used

04h

Not used

05h

Not used

06h

TV_R/C_IN

clamp

RGB gain

TV G and B video switch

TV video switch

07h

Not used

RF_CVBS_

OUT switch

TV_Y/

CVBS_OUT switch

TV fast blank

(fast switching)

TV_R/C_OUT

ground

Set function TV

08h

VCR_R/

C_IN clamp

Not used

ENC_R/

C_IN clamp

VCR video switch

09h

Not used

VCR_R/C_OUT

ground

Set function VCR

0Ah

Not used

0Bh

Not used

0Ch

Not used

0Dh

VCR_Y/

CVBS_OUT

enable

VCR_R/

C_OUT

enable

TV_R/C_OUT

enable

TV_G_OUT

enable

TV_B_OUT

enable

TV_Y/

CVBS_OUT

enable

TVOUT

_FS

enable

RF_CVBS_

OUT

enable

Table 3. Data Format for Write Mode

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