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TAS5709APHPR Datasheet(PDF) 30 Page - Texas Instruments |
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TAS5709APHPR Datasheet(HTML) 30 Page - Texas Instruments |
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30 / 61 page  (1or0) 2 + ´ 1 (1or0) 2 +(1or0) 2 +.......(1or0) 2 +.......(1or0) 2 ´ ´ ´ ´ 0 –1 –4 –23 2 Bit 1 2 Bit 0 2 Bit –1 2 Bit –4 2 Bit –23 M0126-01 u Coefficient Digit8 u u u u u S x Coefficient Digit7 x. x x x Coefficient Digit6 x x x x Coefficient Digit5 x x x x Coefficient Digit4 x x x x Coefficient Digit3 x x x x Coefficient Digit2 x x x x Coefficient Digit1 Fraction Digit5 Fraction Digit4 Fraction Digit3 Fraction Digit2 Fraction Digit1 Integer Digit1 Sign Bit Fraction Digit6 u=unusedordon’tcarebits Digit=hexadecimaldigit M0127-01 0 TAS5709, TAS5709A SLOS599A – NOVEMBER 2008 – REVISED SEPTEMBER 2009 ..................................................................................................................................... www.ti.com The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 33. If the most significant bit is logic 0, the number is a positive number, and the weighting shown yields the correct number. If the most significant bit is a logic 1, then the number is a negative number. In this case every bit must be inverted, a 1 added to the result, and then the weighting shown in Figure 34 applied to obtain the magnitude of the negative number. Figure 34. Conversion Weighting Factors—3.23 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 35 Figure 35. Alignment of 3.23 Coefficient in 32-Bit I2C Word Sample calculation for 3.23 format db Linear Decimal Hex (3.23 Format) 0 1 8388608 800000 5 1.77 14917288 00E39EA8 -5 0.56 4717260 0047FACC X L = 10(X/20) D = 8388608 × L H = dec2hex (D, 8) Sample calculation for 9.17 format db Linear Decimal Hex (9.17 Format) 0 1 131072 20000 5 1.77 231997 38A3D -5 0.56 73400 11EB8 X L = 10(X/20) D = 131072 × L H = dec2hex (D, 8) 30 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s): TAS5709 TAS5709A |
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