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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Page 31
32
Page 32
33
Page 33
34
Page 34
35
Page 35
36
Page 36
37
Page 37
38
Page 38
39
Page 39
40
Page 40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
Page 33/105

Download datasheet (2Mb)Embed
PrevNext
www.ti.com
LOUDNESS
DESCRIPTION
TERM
H(Z)
Loudness biquad
LG
Loudness gain
LO
Loudness offset
G
Gain
loudness (ON = 1, OFF = 0)
O
Offset
See
Figure 2-15
for the resulting loudness function at different gains.
20
10
0
−10
−20
−30
−40
10
2.10 Dynamic Range Control (DRC)
DRC provides both compression and expansion capabilities over three separate and definable regions of
audio signal levels. Programmable threshold levels set the boundaries of the three regions. Within each of
the three regions, a distinct compression or expansion transfer function can be established and the slope
of each transfer function is determined by programmable parameters. The offset (boost or cut) at the two
boundaries defining the three regions can also be set by programmable offset coefficients. The DRC
implements the composite transfer function by computing a 5.23-format gain coefficient from each sample
output from the rms estimator. This gain coefficient is then applied to a mixer element, whose other input
is the audio data stream. The mixer output is the DRC-adjusted audio data.
The TAS5508A has two distinct DRC blocks. DRC1 services channels 1–7 in the 8-channel mode and
channels 1–4 and 7 in the 6-channel mode. This DRC computes rms estimates of the audio data streams
on all channels that it controls. The estimates are then compared on a sample-by-sample basis and the
larger of the estimates is used to compute the compression/expansion gain coefficient. The gain
coefficient is then applied to the appropriate channel audio streams. DRC2 services only channel 8. This
DRC also computes an rms estimate of the signal level on channel 8 and this estimate is used to compute
the compression/expansion gain coefficient applied to the channel-8 audio stream.
Submit Documentation Feedback
Table 2-7. Loudness Function Parameters
USAGE
DATA
FORMAT
Controls shape of
5.23
Loudness curves
Loudness function
5.23
Loudness function
25.23
Switch to enable
5.23
Offset
25.23
100
1k
f − Frequency − Hz
Figure 2-15. Loudness Example Plots
8-Channel Digital Audio PWM Processor
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
2
I
C
DEFAULT
SUB-
HEX
ADDRESS
0x95
b
= 0000 8ACE
b
0
0
b
= 0000 0000
1
b
= FFFF 7532
b
= –0.004236
2
2
a
= FF01 1951
a
= –1.991415
1
1
a
= 007E E914
a
2
2
0x91
FFC0 0000
0x92
0000 0000
0x93
0080 0000
0x94
0000 0000
10k
20k
G001
Description
TAS5508A
FLOAT
= 0.004236
b
= 0
1
= 0.991488
–0.5
0
1
0
33