Datasheet

Error
cancellation
A/Doutput
Audio
interface
SINCfilter
differentiator
4thorder
SINCfilter
integrator
4thorder
1storderhigh-
passfilter
Low-pass
filter
037-017
TPS65930/TPS65920
SWCS037G–MAY 2008– REVISED APRIL 2011 www.ti.com
6.2.6 Digital Audio Filter Module
Figure 6-12 shows the digital audio filter uplink full path characteristics for the audio interface.
Figure 6-12. Digital Audio Filter Uplink Path Characteristics
The high-pass filter (HPF) can be bypassed. It is controlled by the MISC_SET_2 ATX_HPF_BYP bit set to
address 0x49.
Table 6-12 lists the audio filter frequency responses relative to reference gain at 1 kHz.
Table 6-12. Digital Audio Filter TX Electrical Characteristics
Parameter Test Conditions Min Typ Max Unit
Passband 0.0005 0.42 F
S
Passband gain In region 0.0005*F
S
to 0.42*F
S
(1)
–0.25 0.25 dB
Stopband 0.6 F
S
Stopband attenuation In region 0.6*F
S
to 1*F
S
(1)
60 dB
Group delay 15.8/F
S
μs
(1) F
S
is the sampling frequency (8, 11.025, 12, 16, 22.05, 24, 32, 44.1, or 48 kHz).
68 Audio/Voice Module (TPS65930 Device Only) Copyright © 2008–2011, Texas Instruments Incorporated
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