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參數(shù)資料
| 型號： | TS472IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, AUDIO PREAMPLIFIER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, QFN-24 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大小： | 622K |
| 代理商： | TS472IQT |
Application information
TS472
16/24
5.5
Gain settings
The gain in the application depends mainly on:
●
the sensitivity of the microphone
●
the distance to the microphone
●
the audio level of the sound
●
the desired output level
The sensitivity of the microphone is generally expressed in dB/Pa, referenced to 1V/Pa. For
example, the microphone used in testing had an output voltage of 6.3mV for a sound
pressure of 1 Pa (where Pa is the pressure unit, Pascal). Expressed in dB, the sensitivity is:
20Log(0.0063) = -44 dB/Pa
To facilitate the first approach, Table 11 below gives voltages and gains used with a low cost
omnidirectional electret condenser microphone of -44dB/Pa.
The gain of the TS472 microphone preamplifier can be set:
1.
From -1.5 dB to 41 dB by connecting an external grounded resistor RGS to the GS pin.
It allows to adapt more precisely the gain to each application.
2.
To 20dB by applying VGS > 1VDC on Gain Select (GS) pin. This setting can help to
reduce a number of external components in an application, because 2.0 VDC is
provided by TS472 itself on BIAS pin.
Table 11.
Typical TS472 gain vs. distance to the microphone (sensitivity -44dB/Pa)
Distance to microphone
Microphone output voltage
TS472 Gain
1cm
30mVRMS
20
20cm
3mVRMS
100
Table 12.
Selected gain vs. gain select resistor
Gain (dB)
010
20
30
40
RGS (Ω)
470k
27k
4k7
1k
68
Figure 35. Gain in dB vs. gain select resistor
Figure 36. Gain in V/V vs. gain select resistor
10
100
1k
10k
100k
1M
-10
0
10
20
30
40
50
Tamb=25
°C
G
a
in
(d
B
)
R
GS
(
Ω)
10
100
1k
10k
100k
1M
1
10
100
G
a
in
(V
/V
)
Tamb=25
°C
R
GS
(
Ω)
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