Datasheet

TAS5508C
SLES257–SEPTEMBER 2010 www.ti.com
• 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
FILTER SET 1 FILTER SET 2 FILTER SET 3 FILTER SET 4 FILTER SET 5
(kHz)
BASS TREBLE BASS TREBLE BASS TREBLE BASS TREBLE BASS TREBLE
32 42 917 83 1833 125 3000 146 3667 167 4333
38 49 1088 99 2177 148 3562 173 4354 198 5146
44.1 57 1263 115 2527 172 4134 201 5053 230 5972
48 63 1375 125 2750 188 4500 219 5500 250 6500
88.2 115 2527 230 5053 345 8269 402 10106 459 11944
96 125 2750 250 5500 375 9000 438 11000 500 13000
176.4 230 5053 459 10106 689 16538 804 20213 919 23888
192 250 5500 500 11000 750 18000 875 22000 1000 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. Table 2-5 lists the linear gain step sizes.
Table 2-5. Linear Gain Step Size
STEP SIZE (GAIN) 0.5 0.25 0.125 0.0625 0.03125 0.015625 0.007813 0.003906
Time to go from 36.124 db to –127 dB in ms 10.67 21.33 42.67 85.34 170.67 340.35 682.70 1365.4
Time to go from 18.062 db to –127 dB in ms 1.33 2.67 5.33 10.67 21.33 42.67 85.33 170.67
Time to go from 0 db to –127 dB in ms 0.17 0.33 0.67 1.33 2.67 5.33 10.67 21.33
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 Copyright © 2010, Texas Instruments Incorporated
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