TAS3001C datasheet(26/56 Pages) TI

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4−2

The volume is adjustable by downloading a 4.20 gain coefficient through the I2C interface to register (04h). Table A−4

in the Appendix lists the 4.20 coefficient values for 0.5-dB volume steps for the range of –70 dB to 18 dB. However,

positive 4.20 values other than those listed in Table A−4 are allowed.

Right and left channel volumes can be unganged and set to different values to implement balance control.

4.3.2

Software Soft Mute

Mute is implemented by loading all zeros in the volume control register. This causes the volume to ramp down

automatically over a maximum of 2048 samples to a final output of zero (–

∞ dB).

4.4

Tone Controls

4.4.1

Treble Control

The treble gain level may be adjusted within the range of 18 dB to –18 dB with 0.5 dB step resolution. The level

changes are accomplished by downloading the one byte treble control codes into the treble control register (05h).

The bass control codes are shown in Table A−5.

4.4.2

Bass Control

The bass gain level may be adjusted within the range of 18 dB to –18 dB with 0.5 dB step resolution. The level changes

are accomplished by downloading the one byte bass control codes into the bass control register (06h). The treble

control codes are shown in Table A−6.

4.4.3

Frequency Dependence of Treble and Bass Controls

The bass and treble controls are based upon fixed filter coefficients. The coefficients define a response that is a based

upon the data sample rate. As a result, if the sample rate is increased or decreased by a factor, the filter frequency

response will increase or decrease in frequency by an equal factor. Table 4−1 and Table 4−2 show the relationship

between the sample frequency and corner frequency for the bass and treble controls.

Table 4−1. Bass Control Corner Frequencies

Sampling Rate

32,000

44,100

48,000

96,000

Corner Frequency

72.6

100.0

108.8

217.7

Table 4−2. Treble Control Corner Frequencies

Sampling Rate

32,000

44,100

48,000

96,000

Corner Frequency

7,256

10,000

10,884

21,769

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