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TS4909IQT датащи(PDF) 27 Page - STMicroelectronics

номер детали TS4909IQT
подробное описание детали  Dual mode low power 150mW stereo headphone amplifier with capacitor-less and single-ended outputs
PDF  32 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4909IQT датащи(HTML) 27 Page - STMicroelectronics

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TS4909
Application information
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4.6
Wake-up time
When the standby is released to turn the device ON, the bypass capacitor Cb is charged
immediately. As Cb is directly linked to the bias of the amplifier, the bias will not work
properly until the Cb voltage is correct. The time to reach this voltage plus a time delay of
40ms (pop precaution) is called the wake-up time or tWU. It is specified in the electrical
characteristics tables with Cb=1µF (see Section 3: Electrical characteristics on page 5).
If Cb has a value other than 1µF, you can calculate tWU by using the following formulas, or
read it directly from the graph in Figure 82.
●
Single-ended configuration
●
Phantom ground configuration
Figure 82.
Typical wake-up time vs. bypass capacitance
Note:
It is assumed the Cb voltage is equal to 0 V. If the Cb voltage is not equal 0 V, the wake-up
time is lower.
4.7
Pop performance
Pop performance in the phantom ground configuration is closely linked with the size of the
input capacitor Cin. The size of Cin is dependent on the lower cut-off frequency and PSRR
values requested.
In order to reach low pop, Cin must be charged to VCC/2 in less than 40ms. To follow this
rule, the equivalent input constant time (RinCin) should be less then 8ms:
τ in = Rin xCin <0.008 s
By following the previous rules, the TS4909 can reach low pop even with a high gain such as
20dB.
t
WU
Cb
2.5
⋅
0.042
-----------------------
40
[ms;
μF ]
+
=
t
WU
Cb
2.5
⋅
0.417
-----------------------
40
[ms;
μF ]
+
=
012
345
0
50
100
150
200
250
300
350
T
AMB
=25°C
Phantom Ground
Cb
(
μF)
Single Ended



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