TSH345IPT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TSH345IPT

Triple video buffer with selectable filter for HD and SD video applications

STMicroelectronics 

TSH345

Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components

3.1

Output capacitor

The output can be either DC-coupled or AC-coupled. The output can be directly connected

to the line via a 75-Ω resistor (see Figure 34), or an output capacitor can be used to remove

any DC components in the load. Assuming the load is 150 Ω, a coupling capacitor of 220 µF

can be used to provide a very low cut-off frequency close to 5 Hz (see Figure 35).

Figure 34. DC output coupling for SD, PV and HD

Video

DAC

150 7

+5V

TSH345

75 7

75 7cable

75 7

Figure 35. AC output coupling

+5V

Video

DAC

150 7

TSH345

75 7

C=220 µF

+

75 7 cable

CS

AM00822

75 7

AM00823

1. CS is 100 nF used to decrease the parasitic components of C in high frequencies. It is preferable to limit the

use of this output AC-coupling to the standard definition only.

2. The 75-Ω resistor must be as close as possible to the output of the driver to minimize the effect of parasitic

capacitance.

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