TAS3002 datasheet(26/74 Pages) TI

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4–2

SDIN2_L

7 Biquad

Filters

Tone

Soft

Volume

DRCE

SDIN1_L

ADC_L

SDOUT1

7 Biquad

Filters

Tone

Soft

Volume

DRCE

SDIN2_R

SDIN1_R

ADC_R

SDOUT2

1/2

L + R_SUM

Right Channel Mix Coefficients

I2C Register Address 07h

SDIN1 ^ SDIN2 ^ ADC

= (3) 24-Bit Right Mix Coefficient

Left Channel Mix Coefficients

I2C Register Address 08h

= (3) 24-Bit Left Mix Coefficient

SDIN1 ^ SDIN2 ^ ADC

1/2

L_SUM

R_SUM

Figure 4–1. TAS3002 Mixer Function

4.4

Mono Mixer Control

The TAS3002 device contains a second mixer that performs the function of mixing left and right channel digital audio

data from the input mixer in order to derive a monaural channel. This mixer has a fixed gain of –6 dB so that full scale

inputs on L_sum and R_sum do not produce clipping on the resulting L+R_sum.

The output of this mixer is present on terminal 24 (SDOUT2) and is generally used for a digitally-mixed subwoofer

or center channel application.

4.5

Treble Control

The treble gain level may be adjusted within the range of 15 dB to –15 dB with 0.5-dB step resolution. The level

changes are accomplished by downloading treble codes (shown in Table A–6) into the treble gain register.

Alternatively, a limited range of treble control is available by asserting the treble-up or treble-down GPI terminal (see

Section 7.6.1).

The treble control has a corner frequency of 6 kHz at a 48-kHz sample rate.

The gain values for treble control can be found in Section A.4.

TAS3002 Datasheet(PDF) 26 Page - Texas Instruments

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