Manual

MAX9670/MAX9671
Low-Power Audio/Video Switch with Audio
Volume Control for Dual SCART Connectors
38 ______________________________________________________________________________________
EP
GNDVID
MICRO-
CONTROLLER
STB CHIP
VCR
SCART
TV
SCART
75Ω
TV_OUTR
TV_OUTL
TV_SS
TV_B_OUT
TV_G_OUT
TV_R/C_OUT
TVOUT_FS
TV_Y/CVBS_OUT
TV_Y/CVBS_IN
VCR_OUTR
VCR_INR
VCR_OUTL
VCR_INL
VCR_SS
VCR_B_IN
VCR_G_IN
VCR_R/C_IN
VCR_R/C_OUT
VCRIN_FS
VCR_Y/CVBS_OUT
VCR_Y/CVBS_IN
C1NC1P CPVSS
+3.3 V
SDA
SCL
INT
DEV_ADDR
ENC_Y/CVBS_IN
ENC_R/C_IN
ENC_G_IN
ENC_B_IN
ENC_Y_IN
ENC_C_IN
ENC_INL
ENC_INR
VIDEO ENCODER
STEREO
AUDIO DACS
*R1 VALUES
DAC = CS4334/5/8/9: R1 = 4.53kΩ ±1%
DAC = PCM1742: R1 = 5.57kΩ ±1%
1µF
1µF
75Ω
V
12
V
AUD
V
VID
12V 3.3V
0.1µF
TV_INL
(MAX9671 ONLY)
TV_INR
(MAX9671 ONLY)
MAX9670
MAX9671
0.1µF
3.3V
0.1µF
75Ω
75Ω
75Ω
75Ω
75Ω
R1*
6.65kΩ
1µF
75Ω
0.1µF
1µF
75Ω
0.1µF
75Ω
0.1µF
75Ω
75Ω
0.1µF
0.1µF
R1*
6.65kΩ
1µF
2.55kΩ
7.68kΩ
2.55kΩ
7.68kΩ
2.55kΩ
7.68kΩ
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
1µF
2.55kΩ
7.68kΩ
75Ω
75Ω
Typical Application Circuit