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TAS3002 Datasheet(PDF) 26 Page - Texas Instruments |
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TAS3002 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 74 page  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. |
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