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TSH345 Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte TSH345
Spiegazioni elettronici  Triple video buffer with selectable filter for HD and SD video applications
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TSH345
Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components
9/14
4.1
Output capacitor
The output can be either DC-coupled or AC-coupled. The output can be connected to the
line via a 75-ohm resistor directly (see Figure 5). Or, an output capacitor can be used to
remove any DC components in the load. Assuming the load is 150-ohm, a coupling
capacitor of 220 µF can be used to provide a very low cut-off frequency close to 5 Hz (see
Figure 6).
Figure 5.
DC output coupling (1 of 3 channels)
Figure 6.
AC output coupling (1 of 3 channels)
1.
CS is a 100nF used to decrease the parasitic components of C in high frequencies.
2.
The 75-ohm resistor must be as close as possible to the output of the driver to minimize the effect of
parasitic capacitance.
75
Ω
75
Ω Cable
75
Ω
Video
DAC
150
Ω
+5V
TSH345
C=220µF
+
75
Cable
75
Video
DAC
150
75
C
S
+5V
TSH345


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