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参数资料
| 型号： | TS472IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, AUDIO PREAMPLIFIER, QCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, QFN-24 |
| 文件页数： | 9/24页 |
| 文件大小： | 622K |
| 代理商： | TS472IQT |
TS472
Application information
17/24
Figure 37 below gives other values of the gain vs. voltage applied on GS pin.
Figure 37.
Gain vs. gain select voltage
5.6
Wake-up time
When the standby is released to put the device ON, a signal appears on the output a few
microseconds later, and the bypass capacitor Cb is charged in a few milliseconds. As Cb is
directly linked to the bias of the amplifier, the bias will not work properly until the Cb voltage
is correct.
In the typical application, when a biased microphone is connected to the differential input via
the input capacitors (Cin), (and the output signal is in line with the specification), the wake-up
time will depend upon the values of the input capacitors Cin and the gain. When gain is
lower than 0dB, the wake-up time is determined only by the bypass capacitor Cb, as
described above. For a gain superior to 0dB, see Figure 38 below.
Figure 38.
Wake-up time in the typical application vs. input capacitors
0
0.2
0.4
0.6
0.8
4
5
-80
-60
-40
-20
0
20
40
Tamb=25
°C
G
a
in
(d
B)
V
GS
(V)
20
40
60
80
100
0
10
20
30
40
50
60
Gain=20dB
Tamb = 25°C
Vcc=3V
Cb=1
μF
W
a
ke
-up
Time
(ms)
Input capacitors C
IN
(nF)
Maximum Gain
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