TSH343 STMicroelectronics, TSH343 Datasheet - Page 12

• Manufacturer Part Number: TSH343
• Description: 280MHz single-supply triple video buffer
• Manufacturer: STMicroelectronics

Specifications of TSH343

• Bandwidth: 280MHz
• Slew Rate: 780V/μs

Application information
3.2
12/17
PSRR and improvement of power supply noise rejection
Figure 28. Circuit for power supply bypassing
Figure 29
on how carefully the power supply decoupling is achieved.
Figure 29. Power supply noise rejection
Criteria for choosing the ferrite:
●
●
In DC, the resistance (R) of the ferrite must be as low as possible to keep +5V power
supply on the chip.
In AC, along a 30MHz bandwidth (HD spectrum), the equivalent impedance (Z=R+jX)
must be as high as possible to optimize rejection of the noise generated by the power
supply.
shows how the power supply noise rejection evolves versus frequency depending
+5V
+5V
-10
-20
-30
-40
-50
-60
-70
-80
T-bias
T-bias
75Ω
75Ω
0
100k
C
C
L= Ferrite FBMJ4516HM900
CHF=100nF
CLF=10uF
L=2uH
CHF=100nF
CLF=10uF
HF
HF
L
L
TSH343
TSH343
1M
Frequency (Hz)
C
C
LF
LF
50Ω
50Ω
10M
PSRR
AGILENT
AGILENT
4395A
4395A
100M
S
S
R
R
A
A
TSH343