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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)： | 7/24頁 |
| 文件大?。?/td> | 622K |
| 代理商： | TS472IQT |
TS472
Application information
15/24
5.3
Lower cut-off frequency
The lower cut-off frequency FCL of the microphone preamplifier depends on the input
capacitors Cin and output capacitors Cout. These input and output capacitors are mandatory
in an application because of DC voltage blocking.
The input capacitors Cin in series with the input impedance of the TS472 (100kΩ) are
equivalent to a first order high pass filter. Assuming that FCL is the lowest frequency to be
amplified (with a 3dB attenuation), the minimum value of Cin is:
The capacitors Cout in series with the output resistors Rout (or an input impedance of the
next stage) are also equivalent to a first order high pass filter. Assuming that FCL is the
lowest frequency to be amplified (with a 3dB attenuation), the minimum value of Cout is:
versus the value of the input or output capacitors
Note:
In case FCL is kept the same for calculation, take into account that the 1st order high-pass
filter on the input and the 1st order high-pass filter on the output create a 2nd order high-
pass filter in the audio signal path with an attenuation of 6dB on FCL and a rolloff of
40dB
decade.
5.4
Low-noise microphone bias source
The TS472 provides a very low noise voltage and power supply rejection BIAS source
designed for biasing an electret condenser microphone cartridge. The BIAS output is
typically set at 2.0 VDC (no load conditions), and can typically source 2mA with respect to
drop-out, determined by the internal resistance 100
Ω (for detailed load regulation curves
see Figure 8).
C
in
1
2
π F
CL
100
3
× 10
------------------------------------------------------
=
C
out
1
2
π F
CL
R
out
-------------------------------------------
=
Figure 33.
Lower cut-off frequency vs. input
capacitors
Figure 34.
Lower cut-off frequency vs. output
capacitors
1
10
100
10
100
1000
Typical Zin
ZinMAX
L
ower
Cut-off
fre
q
uency
(Hz
)
Cin (nF)
ZinMIN
1
10
100
1000
10
100
1000
Rout=10k
Ω
L
ower
Cut-off
fre
q
uency
(Hz
)
Cout (nF)
Rout=100k
Ω
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