Rainbow Electronics MAX9671 User Manual
Page 16
MAX9670/MAX9671
Low-Power Audio/Video Switch with Audio
Volume Control for Dual SCART Connectors
16
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Video Section
The video circuit routes different video formats between
the set-top box decoder, the TV SCART connector, and
the VCR SCART connector. It also routes slow-switch
and fast-switch control information. See Figure 3.
MAX9670/MAX9671
A
V
= 2V/V
TV_Y/CVBS_IN
MUTE
TV_Y/CVBS_OUT
LOAD SENSE
A
V
= 2V/V
VCR_Y/CVBS_OUT
LOAD SENSE
CLAMP
VCR_Y/CVBS_IN
CLAMP
ENC_Y/CVBS_IN
CLAMP
ENC_Y_IN
CLAMP
ACTIVITY DETECT
ACTIVITY DETECT
ACTIVITY DETECT
ACTIVITY DETECT
LPF
LPF
A
V
= 2V/V
MUTE
TV_R/C_OUT
A
V
= 2V/V
VCR_R/C_OUT
VCR_R/C_IN
CLAMP/BIAS
ENC_R/C_IN
CLAMP/BIAS
ENC_C_IN
CLAMP/BIAS
LPF
LPF
A
V
= 2V/V
MUTE
TV_G_OUT
VCR_G_IN
CLAMP
ENC_G_IN
CLAMP
LPF
A
V
= 2V/V
MUTE
TV_B_OUT
VCR_B_IN
CLAMP
ENC_B_IN
CLAMP
LPF
A
V
= 1V/V
VCRIN_FS
0.7V
V
VID
GNDVID
TVOUT_FS
TO I
2
C
A
V
= 1V/V
V
12
+6V
EP
TV_SS
x1
TO I
2
C
A
V
= 1V/V
V
12
+6V
EP
VCR_SS
x1
Figure 3. MAX9670/MAX9671 Video Section Function Diagram