Datasheet

TVCVBS/
SyncOut
75 W
R'
R
VideoSOC/DAC
G'
R1
B'
R1
CVBS/Sync
R1
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CH1OUT
CH2OUT
CH3OUT
CH4OUT
V
S+
BYPASS
NC
CH1IN
CH2IN
CH3IN
CH4IN
GND
DISABLE
NC
THS7374
ToGPIOController
orGND
Left
R2
TVR'Out
75 W
TVG'Out
75 W
TVB'Out
75 W
+3Vto+5V
Audio
Right
SOC
PCM17xx
R2
Amp
LPFBias
Amp
LPFBias
NE5532
DRV600
DRV601
A
B
C
INH
VEE
VSS
+12V
+12V
100 W
+V
BIAS
47 Fm
100 W
47 Fm
100kW
100kW
+
330 Fm
(1)
VCRCVBS/
SyncOut
75 W
+
330 Fm
(1)
+
330 Fm
(1)
+
330 Fm
(1)
+
330 Fm
(1)
20
18
16
14
12
10
8
6
4
2
19
17
15
13
11
9
7
5
3
1
AudioLeftOut
470 W
47 Fm
AudioRightOut
470 W
47 Fm
AudioLeftOut
470 W
47 Fm
0.1 Fm
AudioRightOut
470 W
47 Fm
NC
NC
NC
NC
NC
NC
NC
NC
75 W
1kW
470 W
1kW
FastBlank
RGB/CVBS
(FromGPIO)
TVSCART
10kW
1.5kW
1.5kW
STBY/TV
(FromGPIO)
16:9/4:3
(FromGPIO)
21
20
18
16
14
12
10
8
6
4
2
19
17
15
13
11
9
7
5
3
1
NC
NC
NC
220 W
VCRSCART
75 W
VCRCVBSIn
VCRMode
22kW
22kW
22kW
21
CD4053
THS7374
SLOS590B –JULY 2008–REVISED JANUARY 2011 www.ti.com
Low-Cost SCART System
of this switch is acceptable in this configuration,
because the input impedance of the THS7374 is 800
The THS7374 is an ideal device for use in low-cost
kΩ and the audio signal impedance requirement is
SCART systems. SCART is used primarily throughout
less than 1 kΩ. Obviously, other switches and
Europe and requires four video channels to support
methods could be used, but this alternative is very
the RGB and timing channel. The timing channel is
low cost compared to fairly expensive SCART
also utilized for CVBS signals for systems that do not
switching ICs. It does not support all possible modes
have separate RGB video signals. The connector
and configurations, but it is a good fit to meet many
also adds audio and several other functions.
system requirements.
Figure 63 shows a low-cost application that allows for
a commonly-used SCART switching interface with a
simple CD4053 switch. The relatively high impedance
(1) These capacitors are optional.
Figure 63. Low-Cost SCART Switching System Circuit
26 Submit Documentation Feedback Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Link(s): THS7374