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TAS5548 Datasheet(PDF) 24 Page - Texas Instruments

Part # TAS5548
Description  TAS5548 8-Channel HD Compatible Audio Processor with ASRC and PWM Output
PDF  118 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

TAS5548 Datasheet(HTML) 24 Page - Texas Instruments

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G003
Desired Gain − Linear
Digital Gain
Power-Supply Gain
0.00001
0.1
100
0.0001
0.01
10
100
1
0.001
0.1
1
10
0.0001
0.001
0.01
−60
−50
−40
−30
−20
−10
0
10
20
30
−80
−70
−60
−50
−40
−30
−20
−10
0
10
20
30
Desired Gain − dB
Digital Gain
Power-Supply Gain
G002
TAS5548
SLES270A – NOVEMBER 2012 – REVISED APRIL 2015
www.ti.com
7.3.6.2.6
Power-Supply Volume Control (PSVC)
The TAS5548 supports volume control both by conventional digital gain/attenuation and by a combination of
digital and analog gain/attenuation. Varying the H-bridge power-supply voltage performs the analog volume
control function. The benefits of using power-supply volume control (PSVC) are reduced idle channel noise,
improved signal resolution at low volumes, increased dynamic range, and reduced radio frequency emissions at
reduced power levels. The PSVC is enabled via I2C. When enabled, the PSVC provides a PWM output that is
filtered to provide a reference voltage for the power supply. The power-supply adjustment range can be set for –-
12.04, –18.06, or –24.08 dB, to accommodate a range of variable power-supply designs.
Figure 18 and Figure 19 show how power-supply and digital gains can be used together.
The volume biquad (0xCF) can be used to implement a low-pass filter in the digital volume control to match the
PSVC volume transfer function. Note that if the PVSC function is not used, the volume biquad is all-pass
(default).
Figure 18. Power-Supply and Digital Gains (Linear Space)
Figure 19. Power-Supply and Digital Gains (Log Space)
24
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Product Folder Links: TAS5548



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