參數(shù)資料
型號(hào)： TS4974IQT
廠商： STMICROELECTRONICS
元件分類： 音頻控制
英文描述： 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, DSO10
封裝： 3 X 3 MM, 0.50 MM PITCH, ROHS COMPLIANT, DFN-10
文件頁(yè)數(shù)： 15/25頁(yè)
文件大?。?/td> 319K
代理商： TS4974IQT
Application information
TS4974
22/25
4.10
Notes on PSRR measurement
What is the 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 is the PSRR measured?
The PSRR is measured as shown in Figure 43.
Figure 43.
PSRR measurement
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 an rms selective measurement.
Cin1
330nF
Cin2
330nF
Cb
1F
STBY control
Vcc
Vripple
8 Ohms
RL
10 Ohms
S1
Volume DOWN
S2
Volume UP
470k
Rpd1
470k
Rpd1
470k
Rpu1
470k
Rpu2
VCC
DIGITAL VOLUME
CONTROL
BIAS
STBY
+
1
2
3
7
6
9
8
4
10
5
UP
DO
W
N
Vin-
Vin+
BYP ASS
STBY
Vout-
Vout+
Vc
c
GN
D
U1
TS4974 DFN10
PSRR
20
Log
RMS
Output
()
RMS
Vripple
()
----------------------------------
×
dB
()
=
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