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参数资料
| 型号： | TS4997 |
| 厂商： | 意法半导体 |
| 英文描述： | 2 x 1W differential input stereo audio amplifier with programmable 3D effects |
| 中文描述： | 2个1W的差分输入立体声音频放大器，可编程的3D效果 |
| 文件页数： | 22/34页 |
| 文件大小： | 434K |
| 代理商： | TS4997 |
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Application information
TS4997
22/34
4.5
Low frequency response
The input coupling capacitors block the DC part of the input signal at the amplifier inputs. In
the low frequency region, C
IN
starts to have an effect. C
IN
and R
IN
form a first-order high
pass filter with a -3dB cut-off frequency.
with R
IN
expressed in
Ω
and C
IN
expressed in F.
So, for a desired -3dB cut-off frequency we can calculate C
IN
:
From
Figure 64
, you can easily establish the C
IN
value required for a -3 dB cut-off frequency
for some typical cases.
Figure 64.
-3dB lower cut-off frequency vs. input capacitance
4.6
3D effect enhancement
The TS4997 features 3D audio effect which can be programmed at three discrete levels
(LOW, MEDIUM, HIGH) through input pins 3D1 and 3D0 which provide a digital interface.
The correspondence between the logic levels of this interface and 3D effect levels are
shown in
Table 9
.
The 3D audio effect applied to stereo audio signals evokes perception of spatial hearing and
improves this effect in cases where the stereo speakers are too close to each other, such as
in small handheld devices, or mobile equipment.
The perceived amount of 3D effect is also dependent on many factors such as speaker
position, distance between speakers and listener, frequency spectrum of audio signal, or
difference of signal between left and right channel. In some cases, the volume can increase
when switching on the 3D effect. This factor is dependent on the composition of the stereo
audio signal and its frequency spectrum.
F
CL
R
IN
2
π
C
IN
×
×
×
----------------------------------------------
Hz
(
)
=
C
IN
R
IN
2
π
F
CL
×
×
×
-----------------------------------------------
F
( )
=
0.2
0.4
0.6
0.8
1
10
100
Rin=24k
Ω
G~6dB
Rin=12k
Ω
G~12dB
Rin=6.2k
Ω
G~18dB
Tamb=25
°
C
L
Input Capacitor Cin (
μ
F)
0.1
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相关代理商/技术参数 |
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|---|---|
| TS4997IQT | 功能描述:音频放大器 Stereo w/3D effects 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 |
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| TS4998IQT | 功能描述:音频放大器 2X1W Differential Input Audio 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 |
| TS4999 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Filter-free stereo 2.8 W class D audio power amplifier with selectable 3D sound effects |
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