THS7314_17 Datasheet, PDF (18/31 Pages) Texas Instruments – 3-Channel SDTV Video Amplifier With 5th-Order Filters and 6-dB Gain

THS7314
SLOS513A – DECEMBER 2006 – REVISED MARCH 2011
www.ti.com
Lastly, due to the edge rates and frequencies of operation, it is recommended – but not required – to place a
0.1-μF to 0.01-μF capacitor in parallel with the large 220-μF to 1000-μF capacitor. These large value capacitors
are most commonly aluminum electrolytic. These capacitors have significantly large ESR (equivalent series
resistance), and their impedance at high frequencies is large due to the associated inductances involved with the
leads and construction. The small 0.1-μF to 0.01-μF capacitors help pass these high frequency (>1 MHz) signals
with much lower impedance than the large capacitors.
Although it is common to use the same capacitor values for all the video lines, the frequency bandwidth of the
chroma signal in a S-Video system are not required to go as low – or as high of a frequency – as the luma
channels. Thus the capacitor values of the chroma line(s) can be smaller – such as 0.1-μF.
Y’
330 mf
Out 1
(Note A) _{75 W}
+
3.3 V
Y’
DAC/
Encoder
SDTV
P’_B
480i/576i
Y’P’_BP’_R
G’B’R’
P’_R
3.3 V
R
0.1 mF
3.3 V
3.3 V
3.01 MW
R
0.1 mF
3.3 V
3.3 V
3.01 MW
R
0.1 mF
THS 7314
1 CH.1 IN
2 CH.2 IN
3 CH.3 IN
4 ^VS+
CH.1 OUT 8
CH.2 OUT 7
CH.3 OUT ₆
GND ₅
0.1 mF
3.3 V
+
22 mF
330 mf
(Note A)
+
75 W
Y’
Out 2
330 mf
(Note A)
+
75 W
P’B
Out 1
330 mf
(Note A)
+
P’B
Out 2
75 W
330 mf
(Note A)
+
75
W
P’_R
Out 1
330 mf
(Note A)
75 W
P’R
Out 2
+
75 W
75 W
75 W
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 0.1-μF or 0.01-μF
capacitor in parallel with these large capators.
B. Current sinking DAC / Encoder shown. See the application notes.
Figure 34. Typical 480i/576i Y'P'_BP'_R AC-Input System Driving 2 AC-Coupled Video Lines
18
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