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参数资料
| 型号： | TS4956EIKJT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.055 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA18 |
| 封装： | ROHS COMPLIANT, FCP-18 |
| 文件页数： | 36/52页 |
| 文件大小： | 1709K |
| 代理商： | TS4956EIKJT |
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TS4956
Application information
41/51
4.4
Low frequency response
4.4.1
Input capacitor Cin
The input coupling capacitor blocks the DC part of the input signal at the amplifier input. In
the low-frequency region, Cin starts to have an effect. Cin with Zin forms a first-order, high-
pass filter with -3 dB cut-off frequency.
Zin is the input impedance of the corresponding input.
Note:
For all inputs, the impedance value remains constant for all gain settings. This means that
the lower cut-off frequency doesn’t change with the gain setting. Note also that 30 k
is a
typical value and there is tolerance around this value. Using Figure 129 you can easily
establish the Cin value required for a -3dB cut-off frequency.
Figure 129. 3dB lower cut off frequency vs. input capacitance
4.4.2
Output capacitor Cout
In the single-ended configuration an external output coupling capacitor, Cout, is needed.
This coupling capacitor Cout, together with the output load RL, forms a first-order high-pass
filter with -3 dB cut off frequency.
See
Figure 130 to establish the Cout value for a -3dB cut-off frequency required.
These two first-order filters form a second-order high-pass filter. The -3 dB cut-off frequency
of these two filters should be the same, so the following formula should be respected:
F
CL
1
2
πZ
inCin
------------------------ (Hz)
=
1
10
100
Typical Input
Impedance
Maximum Input
Impedance
Minimum Input
Impedance
All gain setting
Tamb=25
°C
L
o
w
-3d
B
C
u
tO
ff
F
req
u
e
n
cy
(H
z
)
Input Capacitor Cin (
F)
0.1
F
CL
1
2
πR
LCout
-------------------------- Hz
()
=
1
2
πZ
inCin
------------------------
1
2
πR
L Cout
--------------------------
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| TS4956EKIJT | 1.06 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA18 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4961TIQT | 功能描述:音频放大器 MONO CLASS D AUDIO PWR 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 |
| TS4962 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2.8W filter-free mono class D audio power amplifier |
| TS4962_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2.8W filter-free mono class D audio power amplifier |
| TS4962_10 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2.8 W filter-free mono class D audio power amplifier |
| TS4962EIJT | 制造商:STMicroelectronics 功能描述:AUD AMP SPKR 1CH MONO 2W CLS-D 9PIN FLIP-CHIP - Tape and Reel |
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