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參數(shù)資料
型號: TS4975EIJT
廠商: STMICROELECTRONICS
元件分類: 音頻控制
英文描述: 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA12
封裝: LEAD FREE, FLIP CHIP, 12 PIN
文件頁數(shù): 24/36頁
文件大?。?/td> 870K
代理商: TS4975EIJT
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
Application Information
TS4975
30/36
4.7
Notes on PSRR measurement
What is PSRR?
The PSRR is the Power Supply Rejection Ratio. The PSRR of a device is the ratio between a
power supply disturbance and the result on the output. In other words, the PSRR is the ability of
a device to minimize the impact of power supply disturbance to the output.
How we measure the PSRR?
The PSRR was measured according to the schematic shown in
Figure 62.
Figure 62. PSRR measurement schematic
Principles of operation
The DC voltage supply (VCC) is fixed
The AC sinusoidal ripple voltage (Vripple) is fixed
No bypasss capacitor Cs is used
The PSRR value for each frequency is calculated as:
RMS is a rms selective measurement.
PSRR
20Log
RMS
Out put
()
RMS
V
ri pple
()
--------------------------------- dB
()
=
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