TSH344_07 datasheet(12/17 Pages) STMICROELECTRONICS

tên linh kiện	TSH344

Giải thích chi tiết về linh kiện	340MHz single-supply triple video buffer

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12 / 17 page

Application information

TSH344

12/17

3.2

Power supply considerations

Correct power supply bypassing is very important for optimizing 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 100μF is

necessary to improve the PSRR in low frequencies. For better quality bypassing, a capacitor

of 470nF (CHF) is also added as close as possible to the IC pin to improve the PSRR in the

higher frequencies.

Figure 28. Circuit for power supply bypassing

Figure 29 shows how the power supply noise rejection evolves versus frequency depending

on how carefully the power supply decoupling is achieved.

Figure 29. Improvement of power supply noise rejection

+VCC

TSH344

10k

100k

10M

100M

-80

-70

-60

-50

-40

-30

-20

-10

=100uF

=470nF

without

capacitor

Vcc=5V

Load=150

PSRR=20 log (

ΔVCC/ΔVout)

Frequency (Hz)

TSH344 bảng dữ liệu(PDF) 12 Page - STMicroelectronics