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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Page 32/105

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TAS5508A
8-Channel Digital Audio PWM Processor
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
The TAS5508A has a single set of loudness controls for the eight channels. In 6-channel mode, loudness
is available to the six speaker outputs and also to the line outputs. The loudness control input uses the
maximum individual master volume (V) to control the loudness that is applied to all channels. In the
192-kHz and 176.4-kHz modes, the loudness function is active only for channels 1, 2, and 8.
Audio In
Loudness
Figure 2-14. Loudness Compensation Functional Block Diagram
Loudness function = f(V) = G [2
Loudness function = f(V) = G
For example, for the default values LG = –0.5, LO = 0, G = 1, and O = 0, then:
Loudness function = 1/SQRT(V), which is the recommended transfer function for loudness. So,
Audio out = (audio in)
V + H(Z)
Table 2-6. Default Loudness Compensation Parameters
LOUDNESS
DESCRIPTION
TERM
V
Max volume
Log V
Log
(max volume)
2
H(Z)
Loudness biquad
LG
Gain (log space)
LO
Offset (log space)
G
Gain
loudness (ON = 1, OFF = 0)
O
Offset
2.9.1 Loudness Example
Problem: Due to the Fletcher-Munson phenomena, we want to compensate for low-frequency attenuation
near 60 Hz. The TAS5508A provides a loudness transfer function with EQ gain = 6, EQ center frequency
= 60 Hz, and EQ bandwidth = 60 Hz.
Solution: Using Texas Instruments ALE TAS5508A DSP tool, Matlab™, or other signal-processing tool,
develop a loudness function with the parameters listed in
32
Description
Biquad
H(z)
Loudness Function = f(V)
(Log V)
LG + LO
] + O or alternatively,
LG
LO
[V
2
] + O
SQRT(V). Other transfer functions are possible.
USAGE
DATA
FORMAT
Gains audio
5.23
Loudness function
5.23
Controls shape of
5.23
loudness curves
Loudness function
5.23
Loudness function
25.23
Switch to enable
5.23
Provides offset
25.23
Table
V
Audio Out
V
B0017-01
2
I
C
DEFAULT
SUB-
HEX
FLOAT
ADDRESS
NA
NA
NA
0000 0000
0x95
b
= 0000 D513
b
= 0.006503
0
0
b
= 0000 0000
1
b
= 0FFF 2AED
b
= –0.006503
2
2
a
= 00FE 5045
a
= 1.986825
1
1
a
= 0F81 AA27
a
= –0.986995
2
2
0x91
FFC0 0000
0x92
0000 0000
0x93
0000 0000
0x94
0000 0000
2-7.
Submit Documentation Feedback
www.ti.com
NA
0.0
b
= 0
1
–0.5
0
0
0