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TAS5508A Datasheet(PDF) 25 Page - Texas Instruments |
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TAS5508A Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 99 page  Introduction 17 SLES119 − September 2004 TAS5508A u Coefficient Digit 16 u u u u u u u Coefficient Digit 15 u u u u Coefficient Digit 14 u u u u Coefficient Digit 13 S x x x Coefficient Digit 12 x x x x Coefficient Digit 11 x x x x Coefficient Digit 10 x x x x Coefficient Digit 9 Word 1 (Most Significant Word) Integer Digit 3 Integer Digit 4 (Bits 23 − 21) Integer Digit 2 Integer Digit 1 Sign Bit x Coefficient Digit 8 x x x x x x x Coefficient Digit 7 x. x x x Coefficient Digit 6 x x x x Coefficient Digit 5 x x x x Coefficient Digit 4 x x x x Coefficient Digit 3 x x x x Coefficient Digit 2 x x x x Coefficient Digit 1 Word 2 (Least Significant Word) Fraction Digit 5 Integer Digit 4 (Bit 20) 0 Fraction Digit 6 Fraction Digit 4 Fraction Digit 3 Fraction Digit 2 Fraction Digit 1 Integer Digit 6 Integer Digit 5 u = unused or don’t care bits Digit = hexadecimal digit Figure 1−12. Alignment of 25.23 Coefficient in Two 32-Bit I2C Words 1.5.2.3 TAS5508A Audio Processing The TAS5508A digital audio processing is designed such that noise produced by filter operations is maintained below the smallest signal amplitude of interest, as shown in Figure 1−13. The TAS5508A achieves this by increasing the precision of the signal representation substantially above the number of bits that are absolutely necessary to represent the input signal. Maximum Signal Amplitude Signal bits output Noise Floor as a result of additional precision Ideal Input Desired Output Reduced SNR signal output Noise Floor with no additional precision Possible Outputs Filter Operation Signal bits input Overflow Values retained by overflow bits Figure 1−13. TAS5508A Digital Audio Processing |
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