SLES257 – SEPTEMBER 2010
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•
•
L and R
Sub
The bass and treble filters use a soft update rate that does not produce artifacts during adjustment.
Table 2-4. Bass and Treble Filter Selections
3-dB CORNER FREQUENCIES
FS
(kHz)
32
38
44.1
48
88.2
96
176.4
192
FILTER SET 1
BASS
42
49
57
63
115
125
230
250
TREBLE
917
1088
1263
1375
2527
2750
5053
5500
FILTER SET 2
BASS
83
99
115
125
230
250
459
500
TREBLE
1833
2177
2527
2750
5053
5500
10106
11000
FILTER SET 3
BASS
125
148
172
188
345
375
689
750
TREBLE
3000
3562
4134
4500
8269
9000
16538
18000
FILTER SET 4
BASS
146
173
201
219
402
438
804
875
TREBLE
3667
4354
5053
5500
10106
11000
20213
22000
FILTER SET 5
BASS
167
198
230
250
459
500
919
1000
TREBLE
4333
5146
5972
6500
11944
13000
23888
26000
The I
2
C registers that control bass and treble are:
• Bass and treble bypass register (0x89–0x90, channels 1–8)
• Bass and treble slew rates (0xD0)
• Bass filter sets 1–5 (0xDA)
• Bass filter index (0xDB)
• Treble filter sets 1–5 (0xDC)
• Treble filter index (0xDD)
2.7
Volume, Automute, and Mute
The TAS5508C provides individual channel and master volume controls. Each control provides an
adjustment range of 18 dB to –100 dB in 0.25-dB increments. This permits a total volume device control
range of 36 dB to –100 dB plus mute. The master volume control can be configured to control six or eight
channels.
The TAS5508C has a master soft mute control that can be enabled by a terminal or I
2
C command. The
device also has individual channel soft mute controls that are enabled via I
2
C.
The soft volume and mute update rates are programmable. The soft adjustments are performed using a
soft-gain linear update with an I
2
C-programmable linear step size at a fixed temporal rate. The linear
soft-gain step size can be varied from 0.5 to 0.003906.
lists the linear gain step sizes.
Table 2-5. Linear Gain Step Size
STEP SIZE (GAIN)
0.5
10.67
1.33
0.17
0.25
21.33
2.67
0.33
0.125
42.67
5.33
0.67
0.0625
85.34
10.67
1.33
0.03125
170.67
21.33
2.67
0.015625
340.35
42.67
5.33
0.007813
682.70
85.33
10.67
0.003906
1365.4
170.67
21.33
Time to go from 36.124 db to –127 dB in ms
Time to go from 18.062 db to –127 dB in ms
Time to go from 0 db to –127 dB in ms
2.8
Automute and Mute
The TAS5508C has individual channel automute controls that are enabled via the I
2
C interface. Two
separate detectors can trigger the automute:
• Input automute: All channels are muted when all 8 inputs to the TAS5508C are less in magnitude than
the input threshold value for a programmable amount of time.
30
Description
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