TSH346 查看數據表（PDF） - STMicroelectronics

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TSH346

Triple video buffer/filter for HD video applications

STMicroelectronics 

Power supply considerations and improvement of the PSRR

TSH346

3

Power supply considerations and improvement of the

PSRR

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, a capacitor

of 100 nF (CHF) can be added. CHF must be placed as close as possible to the IC pin, to

improve the noise supply rejection in the higher frequency ranges. 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 21. Circuit for power supply bypassing

+VCC

Coil

CLF

+

CHF

4

R

G

TSH346

B

5

AM00824

8/18

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