TS489 STMicroelectronics, TS489 Datasheet - Page 26

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TS489

Manufacturer Part Number
TS489
Description
Pop-free 120mW stereo headphone amplifier
Manufacturer
STMicroelectronics
Datasheet

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Application information
4.8
Note:
4.9
26/32
Wake-up time
When the standby is released to put the device ON, the bypass capacitor C
immediately. As C
properly until the C
20ms (pop precaution) is called the wake-up time or t
characteristics table with C
If C
can be read directly from
Figure 83. Typical wake-up time vs. bypass capacitance
It is assumed that the C
wake-up time is shorter.
POP performance
Pop performance is closely related to the size of the input capacitor C
dependent on the lower cut-off frequency and PSRR values requested.
In order to reach low pop, C
rule, the equivalent input constant time (R
τ
Example calculation:
In the typical application schematic R
(-3db attenuation) is given by the following formula:
in
= R
b
has a value other than 1µF, t
in
x C
in
< 0.0067 (s)
b
b
is directly linked to the bias of the amplifier, the bias will not work
voltage is correct. The time to reach this voltage plus a time delay of
400
350
300
250
200
150
100
50
b
0
voltage is equal to 0V. If the C
Figure
0
b
in
T
= 1µF.
AMB
must be charged to
t
WU
=25°C
83.
WU
1
=
F
can be calculated by applying the following formulas or
in
CL
C
--------------------- -
0.03125
is 20kΩ and C
b
=
in
2.5
------------------------------------- -
C
2
in
+
) should be less then 6.7ms:
Cb (
20
R
1
in
V
μ
F)
CC
[ms;μF ]
in
C
WU
3
/2 in less than 20ms. To follow this
in
is 330nF. The lower cut-off frequency
b
; it is specified in the electrical
voltage is not equal to 0V, the
4
in
. The size of C
5
b
is charged
TS488-TS489
in
is

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