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| 型号： | TAS5705PAPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封装： | 10 X 10 MM, GREEN, PLASTIC, HTQFP-64 |
| 文件页数： | 31/72页 |
| 文件大小： | 1168K |
| 代理商： | TAS5705PAPG4 |
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SUB_ADDRESS_ENTRY
64
Τ1
=
= 10.63
6.0206
-
1
k =
1
n
-
1
Compression equation: k =
4 =
1
n =
0.3333:1 compression
n
3
-
-
-
d
(g /20)
offset
10
G
=
15.5
www.ti.com ................................................................................................................................................ SLOS549A – JUNE 2008 – REVISED SEPTEMBER 2009
Threshold Parameter Computation
For thresholds,
Tdb = –6.0206 TINPUT = –6.0206 TSUB_ADDRESS_ENTRY
If, for example, it is desired to set T1 = –64 dB, then the subaddress entry required to set T1 to –64 dB is
T1 is entered as a 32-bit number in 9.23 format. Therefore,
T1 = 10.63 = 0 1010.1010 0001 0100 0111 1010 111 = 0x0550 A3D7 in 9.23 format
Slope Parameter Computation
In developing the equations used to determine the subaddress input value required to realize a given
compression or expansion within a given region of the DRC, the following convention has been adopted.
DRC Transfer = Input Increase : Output Increase
If the DRC realizes an output increase of n dB for every dB increase in the rms value of the audio into the DRC,
a 1:n expansion is being performed. If the DRC realizes a 1-dB increase in output level for every n dB increase in
the rms value of the audio into the DRC, an n:1 compression is being performed.
For a 1:n expansion, the slope k can be found by
k = n – 1
For an n:1 compression, the slope k can be found by
(1)
In compression (n:1), n is implied to be greater than 1. For compression, Equation 1 means –1 < k < 0 for n > 1.
Thus k must always lie in the range k > –1.
With k = –4 then, the output decreases 3 dB for every 1-dB increase in the rms value of the audio into the DRC.
As the input increases in signal amplitude, the output decreases in signal amplitude.
DRC Offset Calculation
The DRC offset is calculated by
where gd = desired gain (in dB) and 15.5 is the the fixed antilog normalization factor. A value of gd = 0 indicates
no offset.
Copyright 2008–2009, Texas Instruments Incorporated
37
Product Folder Link(s): TAS5705
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相关代理商/技术参数 |
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| TAS5705PAPR | 功能描述:音频放大器 20W stereo Dig 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 |
| TAS5705PAPRG4 | 功能描述:音频放大器 20W stereo Dig Aud 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 |
| TAS5706 | 制造商:TI 制造商全称:Texas Instruments 功能描述:20-W Stereo Digital Audio Power Amplifier with EQ and DRC |
| TAS5706A | 制造商:TI 制造商全称:Texas Instruments 功能描述:20-W Stereo Digital Audio Power Amplifier with EQ and DRC |
| TAS5706A_0812 | 制造商:TI 制造商全称:Texas Instruments 功能描述:20-W Stereo Digital Audio Power Amplifier with EQ and DRC |
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