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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)： | 6/24頁 |
| 文件大小： | 622K |
| 代理商： | TS472IQT |
Application information
TS472
14/24
5
Application information
5.1
Differential configuration principle
The TS472 is a full-differential input/output microphone preamplifier. The TS472 also
includes a common mode feedback loop that controls the output bias value to average it at
VCC/2. This allows the device to always have a maximum output voltage swing, and by
consequence, maximize the input dynamic voltage range.
The advantages of a full-differential amplifier are:
●
Very high PSRR (power supply rejection ratio).
●
High common mode noise rejection.
●
In theory, the filtering of the internal bias by an external bypass capacitor is not
necessary. But, to reach maximum performance in all tolerance situations, it is better to
keep this option.
5.2
Higher cut-off frequency
The higher cut-off frequency FCH of the microphone preamplifier depends on the external
capacitors C1, C2.
TS472 has an internal first order low pass filter (R=40k
Ω, C=100pF) to limit the highest cut-
off frequency on 40kHz (with a 3dB attenuation). By connecting C1, C2 you can decrease
FCH by applying the following formula:
Figure 32 below indicates directly the higher cut-off frequency in Hz versus the value of the
output capacitors C1, C2 in nF.
For example, FCH is almost 20kHz with C1,2=100pF.
Figure 32.
Higher cut-off frequency vs. output
capacitors
F
CH
1
2
π 40
3
× 10
C
12
,
100
12
–
× 10
+
()
----------------------------------------------------------------------------------------------
=
200
400
600
800
1000
1
10
H
igher
C
u
t-off
Frequency
(kH
z
)
C1, C2 (pF)
40
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