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TSH345

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

STMicroelectronics 

TSH345

Electrical characteristics

2.1

Power supply considerations: improving the power supply

noise rejection

Correct power supply bypassing is very important to optimize performance in low- and high-

frequency ranges. Bypass capacitors should be placed as close as possible to the IC pin

(pin 4) to improve high-frequency bypassing. A capacitor (CLF) greater than 10 µF is

necessary to improve the PSRR in low frequencies. For better quality bypassing, you can

add a capacitor of 100 nF (CHF). CHF must be placed as close as possible to the IC pin to

improve the noise supply rejection in the higher frequencies. A coil can be added in order to

better reject the noise from the supply and to prevent current peaks as much as possible.

Figure 26. Circuit for power supply bypassing

+VCC

Coil

CLF

+

CHF

7

R

G

TSH345

B

8

AM00816

11/23

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