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TAS5504A Datasheet(PDF) 24 Page - Texas Instruments |
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TAS5504A Datasheet(HTML) 24 Page - Texas Instruments |
24 / 97 page www.ti.com 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 2−23 Bit S_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx 20 Bit 216 Bit 222 Bit Sign Bit 223 Bit 2−1 Bit 2−10 Bit M0007-02 TAS5504A 4-Channel Digital Audio PWM Processor SLES169 – FEBRUARY 2006 Figure 1-7. Alignment of 5.23 Coefficient in 32-Bit I2C Word As Figure 1-7 shows, the hexadecimal value of the integer part of the gain coefficient cannot be concatenated with the hexadecimal 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 hexadecimal digit and the most significant bit of the second hexadecimal digit. In the same way, the fractional part occupies the lower 3 bits of the second hexadecimal digit, and then occupies the other five hexadecimal digits (with the eighth digit being the zero-valued most significant hexadecimal digit). 1.4.5.2.2 48-Bit 25.23 Number Format All level-adjustment and threshold coefficients are 48-bit coefficients using a 25.23 number format. Numbers formatted as 25.23 numbers means that there are 25 bits to the left of the decimal point and 23 bits to the right of the decimal point. This is shown in Figure 1-8. Figure 1-8. 25.23 Format Figure 1-9 shows the derivation of the decimal value of a 48-bit, 25.23 format number. 24 Introduction |
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