IC DGTL AUDIO PWM PROC 64-TQFP

TAS5508APAG

Manufacturer Part NumberTAS5508APAG
DescriptionIC DGTL AUDIO PWM PROC 64-TQFP
ManufacturerTexas Instruments
TypePWM Processor
TAS5508APAG datasheet
 


Specifications of TAS5508APAG

ApplicationsDVDMounting TypeSurface Mount
Package / Case64-TQFP, 64-VQFPFor Use WithTAS5342DDV6EVM - TAS5342DDV6EVMTAS5508-5142K7EVM - EVAL MODULE FOR TAS5508B/TAS5142TAS5508-5122C6EVM - EVAL MODULE FOR TAS5508B/TAS5122TAS5508-5121K8EVM - EVAL MODULE FOR TAS5508B/TAS5121
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names296-17475
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TAS5508A
8-Channel Digital Audio PWM Processor
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
All of the TAS5508A default values for DRC can be used except for the DRC1 decay and DRC2 decay.
Table 2-8
shows the recommended time constants and their hex values. If the user wants to implement
other DRC functions, Texas Instruments recommends using the automatic loudspeaker equalization (ALE)
tool available from Texas Instruments. The ALE tool allows the user to select the DRC transfer function
graphically. It then outputs the TAS5508A hex coefficients for download to the TAS5508A.
Table 2-8. DRC Recommended Changes From TAS5508A Defaults
2
I
C
REGISTER FIELDS
SUBADDRESS
0x98
DRC1 energy
DRC1 (1 – energy)
0x9C
DRC1 attack
DRC1 (1 – attack)
DRC1 decay
DRC1 (1 – decay)
0x9D
DRC2 energy
DRC2 (1 – energy)
0xA1
DRC2 attack
DRC2 (1 – attack)
DRC2 decay
DRC2 (1 – decay)
Recommended DRC setup flow if the defaults are used:
After power up, load the recommended hex value for DRC1 and DRC2 decay and (1 – decay). See
Table
2-8.
Enable either the pre-volume or post-volume DRC.
Recommended DRC setup flow if the DRC design uses values different from the defaults:
After power up, load all DRC coefficients per the DRC design.
Enable either the pre-volume or post-volume DRC.
Figure 2-16
shows the positioning of the DRC block in the TAS5508A processing flow. As seen, the DRC
input can come either before or after soft volume control and loudness processing.
From Input Mixer
Figure 2-16. DRC Positioning in TAS5508A Processing Flow
Figure 2-17
illustrates a typical DRC transfer function.
34
Description
RECOMMENDED TIME
CONSTANT (ms)
5
5
2
5
5
2
Master
Volume
Channel Volume
Bass and Treble
Bypass
7
Bass
Biquads
and
in
Treble
Series
Pre-
Volume
Volume
Bass
and
Treble
Inline
DRC
RECOMMENDED
DEFAULT HEX
HEX VALUE
0000 883F
0000 883F
007F 77C0
007F 77C0
0000 883F
0000 883F
007F 77C0
007F 77C0
0001 538F
0000 00AE
007E AC70
007F FF51
0000 883F
0000 883F
007F 77C0
007F 77C0
0000 883F
0000 883F
007F 77C0
007F 77C0
0001 538F
0000 00AE
007E AC70
007F FF51
Max
Volume
DRC
Bypass
Loudness
To Output Mixer
Post-
DRC
Inline
B0016-02
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