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TS4998 датащи(PDF) 28 Page - STMicroelectronics

номер детали TS4998
подробное описание детали  2 x 1W differential input stereo audio amplifier
PDF  33 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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TS4998 датащи(HTML) 28 Page - STMicroelectronics

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Application information
TS4998
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4.13
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 68.
Figure 68.
PSRR measurement
Principles of operation
●
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 an rms selective measurement.
Cin1
4.7uF
Cb
1uF
Rin1
Rin2
Rin3
Rin4
Cin2
4.7uF
Cin3
4.7uF
Cin4
4.7uF
RL
8Ohms
RL
8Ohms
Vcc
Vripple
1
2
4
3
14
12
11
9
10
BIAS
STBY
LEFT
RIGHT
LI N-
RIN-
LI N+
RIN+
Bypass
GND
GND
LOUT-
LOUT+
ROUT-
ROUT+
-
+
+
-
Vcc
TS4998
U1
TS4998 - QFN16
PSRR
20
Log
RMS
Output
()
RMS
Vripple
()
----------------------------------
×
dB
()
=



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