參數(shù)資料
型號(hào): TAS5706APAPR
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64
封裝: 10 X 10 MM, GREEN, PLASTIC, HTQFP-64
文件頁(yè)數(shù): 28/71頁(yè)
文件大?。?/td> 1554K
代理商: TAS5706APAPR
Loudness Function
Volume
Biquad(0x24)
From
Input
Mux
To
Output
Mux
Loudness
Biquad(0x23)
Gain=G
1ifVol
1/G
0ifVol
1/G+1/Scale
1
Scale(Vol
1/G)otherwise
-
0ifVol
1/G
1ifVol
1/G+1/Scale
Scale(Vol
1/G)otherwise
-
B0273-01
Scale=1/(1
1/G)
-
SLOS606D – MARCH 2009 – REVISED SEPTEMBER 2009............................................................................................................................................. www.ti.com
The TAS5706A provides a direct form I biquad for loudness on the subwoofer channel. The first biquad is
contained in a gain-compensation circuit that maintains the overall system gain at 1 or less to prevent clipping at
loud volume settings. This gain compensation is shown in Figure 46
Figure 46. Biquad Gain Control Structure
Table 1. Loudness Table Example for Gain = 4, 1/G = 0.25, Scale = 1.33
Volume
0.125
0.25
0.375
0.5
0.625
0.75
0.875
1
1.125
1.25
1.375
1.5
1.625
1.75
1.875
2
Biquad path
1
0.833
0.666
0.5
0.333
0.166
0
Direct path
0
0.166
0.333
0.5
0.666
0.833
1
Total gain
1
The biquads are implemented in a direct form-I architecture. The direct form-I structure provides a separate delay
element and mixer (gain coefficient) for each node in the biquad filter.
The five 26-bit (3.23) coefficients for the biquad are programmable via the I2C interface.
The following steps are involved in using a loudness biquad with the volume compensation feature:
1. Program the biquad with a loudness filter.
2. Program 0x26 (1/G) and 0x28 (scale).
3. Enable volume compensation in register 0x0E.
34
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TAS5706A TAS5706B
相關(guān)PDF資料
PDF描述
TAS5706APAP 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64
TAS5706PAPRG4 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64
TAS5706PAPR 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64
TAS5706PAP 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64
TAS5706PAPG4 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64
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