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TS4956 数据表(PDF) 44 Page - STMicroelectronics

部件名 TS4956
功能描述  Stereo audio amplifier system with I2C bus interface
PDF  51 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4956 数据表(HTML) 44 Page - STMicroelectronics

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TS4956
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4.8
Notes on PSRR measurements
4.8.1
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.
4.8.2
How we measure the PSRR?
The PSRR was measured with the TS4956 in the configuration shown in the schematic in
Figure 132
Figure 132. Configuration schematic of TS4956 for PSRR measurement
Main operating principles of TS4956 for purposes of PSRR measurement:
●
The DC voltage supply (VCC) is fixed
●
The AC sinusoidal ripple voltage (Vripple) is fixed
●
No bypass capacitor Cs is used
The PSRR value for each frequency is calculated as:
RMS is a rms selective measurement.
F
F
E
E
D
D
C
C
B
B
A
A
Bias
control
Select
I2C
Mode
TS4956
LHP
MLO
PHG
RHP
LHP Amplifier
Speaker Amplifier
RHP Amplifier
PHG Amplifier
I2CVCC
BYPASS
Digital volume
SRP+
SRN-
MLO Amplifier
Stereo
Stereo
Input Left
Input Right
LIN
RIN
Stereo
Stereo
Input Left
Input Right
MIP
MIN
B4
A2
A1
A5
B6
A7
D6
B2
D2
E7
Cb
1µF
16 Ohms
RL
+
Cout
220µF
I2CVCC
SCL
SDA
+
Cin1
330nF
+
Cin2
330nF
Diff. input +
Diff. input -
I2C BUS
+
Cin3
330nF
+
Cin4
330nF
SE input left
SE input right
8 Ohms
RL
16 Ohms
RL
16 Ohms
RL
8 Ohms
RL
MODE7
10 Ohms
10 Ohms
10 Ohms
10 Ohms
Vripple
Vcc
PSRR
20Log
RMS
Out put
()
RMS
Vripple
()
---------------------------------- dB
()
=



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