Datasheet

−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 and Power-Supply Gain − dB
Digital Gain
Power-Supply Gain
G002
G003
Desired Gain − Linear
Digital and Power-Supply Gain − dB
Digital Gain
Power-Supply Gain
0.00001 0.1 100
0.0001
0.01
10
100
1
0.001
0.1
1
100.0001 0.001 0.01
TAS5508C
www.ti.com SLES257–SEPTEMBER 2010
Figure 2-20. Power-Supply and Digital Gains (Log Space)
Figure 2-21. Power-Supply and Digital Gains (Linear Space)
2.12.4 AM Interference Avoidance
Digital amplifiers can degrade AM reception as a result of their RF emissions. Texas Instruments' patented
AM interference-avoidance circuit provides a flexible system solution for a wide variety of digital audio
architectures. During AM reception, the TAS5508C adjusts the radiated emissions to provide an
emission-clear zone for the tuned AM frequency. The inputs to the TAS5508C for this operation are the
tuned AM frequency, the IF frequency, and the sample rate. The sample rate is automatically detected.
Copyright © 2010, Texas Instruments Incorporated Description 41
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