THS7313 Datasheet, PDF (29/48 Pages) Texas Instruments – 3-Channel Low Power SDTV Video Amplifier with I2C Control, 6-dB Gain, SAG Correction, 2:1 Input MUX, and Selectable Input Bias Modes

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3.3 V
APPLICATION INFORMATION (continued)
THS7313
SLOS483 – NOVEMBER 2005
Y’
R
P’_B
R
P’_R
DAC /
Encoder
R
S-Video
Y’
R
S-Video
C’
R
CVBS
R
DC + 135 mV
1 NC
NC 20
2
DC + 135 mV
3
DC + 135 mV
4
CH.1 IN A
CH.2 IN A
CH.3 IN A
DC + 135 mV
5 CH.1 IN B
DC + 135 mV
6 _{CH.2 IN B}
DC + 135 mV
7 _{CH.3 IN B}
CH.1 OUT 19
CH.1 SAG ¹⁸
CH.2 OUT ¹⁷
CH.2 SAG 16
CH.3 OUT 15
CH.3 SAG 14
8 I2C-A1
SCL 13
9 I2C-A0
10 GND
SDA 12
VS+ ¹¹
0.01 mF
330 mF
(See Note A)
+
Video
Out 1
75 W
330 mF
(See Note A)
+
Video
Out 2
75 W
330 mF
(See Note A)
+
Video
Out 3
75 W
+Vs
+
100 mF
2
IC
Controller
75 W
75 W
75 W
A. Due to the high frequency content of the video signal, it is recommended, but not required, to add a 0.01-µF capacitor
in parallel with these large capacitors.
Figure 56. Typical SDTV and 480i/576i Encoder DAC Driving a Single THS7313
Although the circuit of Figure 56 conserves space and cost, the re-use of the output connections may not be the
best solution. For a complete 6-channel system, it is better to use the THS7313 and the THS7303 (see
SLOS479) together as shown in Figure 57. The THS7303 is targeted for HDTV signals, and has a 9-MHz,
16-MHz, 35-MHz, and a 190-MHz bypass mode amplifier targeting the faster HDTV signals and the high end
computer R'G'B' signals. As the I²C section discusses, it is easy to have both parts in one system as the I²C
address of each part can be one of 4 discrete addresses by the logic appearing on the I²C-A1 and I²C-A0 lines.
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