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参数资料
| 型号： | TDA1905 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 5.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDIP16 |
| 封装： | POWER, PLASTIC, DIP-16 |
| 文件页数： | 2/14页 |
| 文件大小： | 339K |
| 代理商： | TDA1905 |
10/14
MUTING FUNCTION
The output signal can be inhibited applying a DC voltage VT to pin 4, as shown in fig. 29
Figure 29
The input resistance at pin 5 depends on the threshold voltage VT at pin 4 and is typically :
R5 = 200 K
@ 1.9V ≤ VT ≤ 4.7V
muting-off
R5 =
10
@
0V
≤ VT ≤ 1.3V
muting-on
6V
≤ VT ≤ Vs
Referring to the following input stage, the possible attenuation of the input signal and therefore of the output
Considering Rg = 10 K
the attenuation in the
muting-on condition is typically AT = 60 dB. In the
muting-off condition, the attenuation is very low,
typically 1.2 dB.
A very low current is necessary to drive the thresh-
old voltage VT because the input resistance at pin
4 is greater than 150 K
. The muting function can
be used in many cases, when a temporary inhibition
of the output signal is requested, for example:
– in switch-on condition, to avoid preamplifier
power-on transients (see fig. 22)
AT
=
Vi
V8
=
Rg
+ (
R8 R5
R8
+ 5
)
(
R8 R5
R8
+ R5
)
where R8
100 K
– during switching at the input stages.
– during the receiver tuning.
The variable impedance capability at pin 5 can be
useful in many applications and two examples are
shown in fig. 25 and 27, where it has been used to
change the feedback network, obtaining 2 different
frequency responses.
TDA1905
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA1905 | 制造商:STMicroelectronics 功能描述:IC AUDIO AMP + MUTE 5W |
| TDA1908 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8W AUDIO AMPLIFIER |
| TDA1910 | 功能描述:音频放大器 10W Audio Amplifier 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 |
| TDA1910_03 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:10W AUDIO AMPLIFIER WITH MUTING |
| TDA1910HS | 功能描述:音频放大器 10W AUDIO AMPLIFIER 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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