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TAS5548DCAR Datasheet(PDF) 33 Page - Texas Instruments |
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TAS5548DCAR Datasheet(HTML) 33 Page - Texas Instruments |
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33 / 116 page  u Coefficient Digit 8 u u u S 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 Fraction Digit 5 Sign Bit 0 Fraction Digit 6 Fraction Digit 4 Fraction Digit 3 Fraction Digit 2 Fraction Digit 1 Integer Digit 1 u = unused or don’t care bits Digit = hexadecimal digit M0009-01 (1 or 0) 23 + (1 or 0) 22 + … + (1 or 0) 20 + (1 or 0) 2−1 + … + (1 or 0) 2−4 + … + (1 or 0) 2−23 23 Bit 22 Bit 20 Bit 2−1 Bit 2−4 Bit 2−23 Bit M0008-01 TAS5548 www.ti.com SLES270A – NOVEMBER 2012 – REVISED APRIL 2015 Figure 29. Conversion Weighting Factors—5.23 Format to Floating Point Gain coefficients, entered via the I2C bus, must be entered as 32-bit binary numbers. The format of the 32-bit number (4-byte or 8-digit hexadecimal number) is shown in Figure 30. Figure 30. Alignment of 5.23 Coefficient in 32-Bit I2C Word As Figure 30 shows, the hexadecimal (hex) value of the integer part of the gain coefficient cannot be concatenated with the hex value of the fractional part of the gain coefficient to form the 32-bit I2C coefficient. The reason is that the 28-bit coefficient contains 5 bits of integer, and thus the integer part of the coefficient occupies all of one hex digit and the most significant bit of the second hex digit. In the same way, the fractional part occupies the lower three bits of the second hex digit, and then occupies the other five hex digits (with the eighth digit being the zero-valued most significant hex digit). 7.4.10.3 TAS5548 Audio Processing The TAS5548 digital audio processing is designed so that noise produced by filter operations is maintained below the smallest signal amplitude of interest, as shown in Figure 31. The device achieves this low noise level by increasing the precision of the signal representation substantially above the number of bits that are absolutely necessary to represent the input signal. Similarly, the TAS5548 carries additional precision in the form of overflow bits to permit the value of intermediate calculations to exceed the input precision without clipping. The TAS5548's advanced digital audio processor achieves both of these important performance capabilities by using a high-performance digital audio-processing architecture with a 32-bit data path, 28-bit filter coefficients, and a 60-bit accumulator. Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 33 Product Folder Links: TAS5548 |
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