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TAS5706A View Datasheet(PDF) - Texas Instruments

Part NameTAS5706A TI
Texas Instruments TI
Description20-W Stereo Digital Audio Power Amplifier with EQ and DRC
TAS5706A Datasheet PDF : 71 Pages
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TAS5706A
TAS5706B
TAS5706A is Not Recommended for New Designs
SLOS606D – MARCH 2009 – REVISED SEPTEMBER 2009............................................................................................................................................. www.ti.com
Loudness Function
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
From
Input
Mux
Volume
1 if Vol £ 1/G
0 if Vol ³ 1/G + 1/Scale
1 - Scale (Vol - 1/G) otherwise
Loudness
Biquad (0x23)
Gain = G
Biquad (0x24)
To
Output
Mux
Scale = 1/(1 - 1/G)
0 if Vol £ 1/G
1 if Vol ³ 1/G + 1/Scale
Scale (Vol - 1/G) otherwise
Figure 46. Biquad Gain Control Structure
B0273-01
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
1 0.833 0.666 0.5 0.333 0.166 0
0
0
0
0
0
0
0
0
Direct path
0
0 0.166 0.333 0.5 0.666 0.833 1
1
1
1
1
1
1
1
1
Total gain
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
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