IC AUDIO PWM PROC 64TQFP

TAS5508APAGR

Manufacturer Part NumberTAS5508APAGR
DescriptionIC AUDIO PWM PROC 64TQFP
ManufacturerTexas Instruments
TypePWM Processor
TAS5508APAGR datasheet
 


Specifications of TAS5508APAGR

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 Compliant  
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Page 32/105

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TAS5508
8-Channel Digital Audio PWM Processor
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
Audio In
Loudness
Figure 2-14. Loudness Compensation Functional Block Diagram
Loudness function = f(V) = G =[2
Loudness function = f(V) = G = [V
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) = SQRT(V). Other transfer functions are possible.
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 TAS5508 provides a loudness transfer function with EQ gain = 6, EQ center frequency =
60 Hz, and EQ bandwidth = 60 Hz.
Solution: Using Texas Instruments ALE TAS5508 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
= 2
] + O
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.
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www.ti.com
NA
0.0
b
= 0
1
–0.5
0
0
0