Texas Instruments THS7303EVM Evaluation Module THS7303EVM THS7303EVM Scheda Tecnica
Codici prodotto
THS7303EVM
17
20
19
18
GND
16
CH.2 IN B
CH.3 IN B
15
I 2C-A0
SDA
V
S +
11
14
13
12
SCL
CH. 3 SAG
I 2C-A1
CH.1 IN B
CH.2 IN A
CH.3 IN A
CH.1 IN A
NC
CH.3 OUT
CH. 2 SAG
CH.2 OUT
CH. 1 SAG
CH.1 OUT
NC
1
2
3
4
5
6
7
8
9
10
+
+
+
+
S-Video
Y’
S-Video
C’
CVBS
Y’
P’
B
P’
R
R
R
R
R
R
R
DAC /
Encoder
3.3 V
75 W
75 W
75 W
75 W
75 W
75 W
Video
Out 1
Video
Out 2
Video
Out 3
0.01 F
m
+Vs
100 F
m
330 F
m
(See Note A)
330 F
m
(See Note A)
330 F
m
(See Note A)
I C
Controller
2
DC + 135 mV
DC + 135 mV
DC + 135 mV
DC + 135 mV
DC + 135 mV
DC + 135 mV
SLOS479B
–
OCTOBER 2005
–
REVISED MARCH 2011
The I
2
C interface of the THS7303 allows each channel to be configured totally independent of the other
channels. One of the benefits is that a multiple output encoder (or DAC) can be routed through one THS7303
with the proper input configuration and low-pass filter required regardless of the signal. This is useful for a
portable system or in a low-cost system where only one set (or two sets in parallel) is desired on the output of
the system. An update of the I
with the proper input configuration and low-pass filter required regardless of the signal. This is useful for a
portable system or in a low-cost system where only one set (or two sets in parallel) is desired on the output of
the system. An update of the I
2
C commands changes the THS7303 channels. An example is shown in
where the input MUX allows for one set of HDTV signals to be put into the THS7303, and then through an I
2
C
update, a SDTV set of signals is sent through the THS7303 with the proper input mode and low-pass filters.
A.
Due to the high frequency content of the video signal, it is recommended, but not required, to add a 0.01-
μ
F capacitor
in parallel with these large capacitors.
Figure 69. Typical SD/ED/ and HD Video and SDTB Encoder DAC Driving a Single THS7303
Although the circuit of
conserves space and cost, the reuse of the output connections may not be the
best solution. For a complete 6-channel system, it is better to use the THS7303 and the THS7313 (see
) together, as shown in
. The THS7313 is targeted for SDTV signals and is limited to an
8-MHz filter. As discussed in the I
2
C section, it is easy to have both parts in one system because the I
2
C address
of each part can be one of four discrete addresses by the logic appearing on the I
2
C-A1 and I
2
C-A0 lines.
Copyright
©
2005
–
2011, Texas Instruments Incorporated
35
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