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TS4855 датащи(PDF) 22 Page - STMicroelectronics

номер детали TS4855
подробное описание детали  LOUDSPEAKER & HEADSET DRIVER WITH VOLUME CONTROL
PDF  27 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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TS4855 датащи(HTML) 22 Page - STMicroelectronics

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TS4855
Application Information
22/27
6.6 Pop and Click performance
The TS4855 has internal Pop and Click reduction
circuitry. The performance of this circuitry is
closely linked with the value of the input capacitor
Cin and the bias voltage bypass capacitor Cb.
The value of Cin is due to the lower cut-off
frequency value requested. The value of Cb is
due to THD+N and PSRR requested always in
lower frequency.
The TS4855 is optimized to have a low pop and
click in the typical schematic configuration (see
page 2).
Note: The value of Cs is not an important
consideration as regards pop and click.
6.7 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. We can say that the PSRR is the ability of
a device to minimize the impact of power supply
disturbances to the output.
How we measure the PSRR?
The PSSR was measured according to the
schematic shown in
Figure 57.
Figure 57: PSRR measurement schematic
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:
Note: The measure of the Rms voltage is not an Rms
selective measure but a full range (20 Hz to
125 kHz) Rms measure. This means that the
effective Rms signal + the Noise is measured.
As the measurement is performed with a wide-
band frequency range apparatus, we have to
subtract the Noise part (quadratic operation) of
the measurement to obtain the real Rms signal
needed to calculate the PSRR, as shown in the
formula above.
)
dB
(
RMS
RMS
Log
20
PSRR
)
Vripple
(
)
Output
(
×
=



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