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參數(shù)資料
| 型號(hào)： | TS489IST |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Pop-free 120mW stereo headphone amplifier |
| 中文描述： | 流行無(wú)120mW立體聲耳機(jī)放大器 |
| 文件頁(yè)數(shù)： | 26/32頁(yè) |
| 文件大?。?/td> | 465K |
| 代理商： | TS489IST |
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Application information
TS488-TS489
26/32
4.8
Wake-up time
When the standby is released to put the device ON, the bypass capacitor C
b
is charged
immediately. As C
b
is directly linked to the bias of the amplifier, the bias will not work
properly until the C
b
voltage is correct. The time to reach this voltage plus a time delay of
20ms (pop precaution) is called the wake-up time or t
WU
; it is specified in the electrical
characteristics table with C
b
= 1μF.
If C
b
has a value other than 1μF, t
WU
can be calculated by applying the following formulas or
can be read directly from
Figure 83
.
C
2.5
0.03125
Figure 83.
Typical wake-up time vs. bypass capacitance
Note:
It is assumed that the C
b
voltage is equal to 0V. If the C
b
voltage is not equal to 0V, the
wake-up time is shorter.
4.9
POP performance
Pop performance is closely related to the size of the input capacitor C
in
. The size of C
in
is
dependent on the lower cut-off frequency and PSRR values requested.
In order to reach low pop, C
in
must be charged to
V
CC
/2 in less than 20ms. To follow this
rule, the equivalent input constant time (R
in
C
in
) should be less then 6.7ms:
τ
in
=
R
in
x C
in
< 0.0067 (s)
Example calculation:
In the typical application schematic R
in
is 20k
Ω
and C
in
is 330nF. The lower cut-off frequency
(-3db attenuation) is given by the following formula:
t
WU
----------------------
20 [ms;
μ
F
]
+
=
0
1
2
3
4
5
0
50
100
150
200
250
300
350
400
T
AMB
=25°C
W
Cb (
μ
F)
F
CL
2
π
R
in
C
in
-------------------------------------
=
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|---|---|
| TS4900 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
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| TS4900IS | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
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