- 您现在的位置：买卖IC网 > PDF目录98288 > TS472IQT (STMICROELECTRONICS) 1 CHANNEL, AUDIO PREAMPLIFIER, QCC24 PDF资料下载
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： | 7/24页 |
| 文件大小： | 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
相关PDF资料 |
PDF描述 |
|---|---|
| TS482IDT | 0.107 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS482ID | 0.107 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS482IST | 0.107 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS482IQT | 0.107 W, 2 CHANNEL, AUDIO AMPLIFIER, DSO8 |
| TS4851EIJT | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA18 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS475NJS | 制造商:Xcelite 功能描述:5" Tapered Head Diagonal Cutter |
| TS48-0600-F-A-FS-OE-4000-Y | 制造商:TAPESWITCH CORP 功能描述:4602??? TS46, 600mm / 23-5/8 inches |
| TS482 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:100mW STEREO HEADPHONE AMPLIFIER |
| TS482_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:100mW Stereo Headphone Amplifier |
| TS482ID | 功能描述:音频放大器 100mW Headphone Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。