Table 3. data format for write mode – Rainbow Electronics MAX9595 User Manual
Page 17
Power Supplies and Bypassing
The MAX9595 features single 5V and 12V supply opera-
tion and requires no negative supply. The +12V supply
V
12
is for the SCART switching function. For pin V
12
,
place all bypass capacitors as close as possible with a
10µF capacitor in parallel with a 0.1µF ceramic capacitor.
Connect all V
AUD
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 V
AUD
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 V
DIG
with a 0.1µF ceramic capacitor to digital
ground. Bypass each V
VID
to video ground with a 0.1µF
ceramic capacitor. Connect V
VID
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 MAX9595. Avoid routing video traces par-
allel to high-speed data lines.
The MAX9595 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 MAX9595 evalu-
ation kit for a proven circuit board layout example.
MAX9595
Audio/Video Switch for Dual SCART Connector
______________________________________________________________________________________
17
REGISTER
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
Interrupt
enable
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
Not used
Not used
ENC_R/
C_IN clamp
VCR video switch
09h
Not used
Not used
Not used
Not used
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