TSH346 Using the TSH346 to drive YC, CVBS, YUV, YPbPr and RGB video components
13/18
4.1 Output capacitor
The output can be either DC- or AC-coupled, and can be directly connected to the line via a
75-Ω resistor (4) (Figure 27). Alternatively, an output capacitor can be used to remove any
DC components in the load. Assuming a 150-Ω load, a coupling capacitor of 220 µF can be
used to provide a very low cut-off frequency close to 5 Hz (Figure 28).
Figure 27. IDC output coupling (1 of 3 channels)
Figure 28. AC output coupling (1 of 3 channels)
1. C
S
is a 100 nF used to decrease the parasitic components of C in high frequencies.
2. The 75-Ω resistor must be as close as possible to the output of the driver to minimize the effect of parasitic
capacitance.
75 7
75 7cable
75 7
Video
DAC
+5V
TSH346
AM00828
150 7
C = 220 µF
+
75 7 cable
75 7
Video
DAC
150 7
75 7
C
S
+5V
TSH346
AM00829
Obsolete Product(s) - Obsolete Product(s)
