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TAS5508B Datasheet(PDF) 28 Page - Texas Instruments |
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TAS5508B Datasheet(HTML) 28 Page - Texas Instruments |
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28 / 106 page  www.ti.com 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 (1 or 0) y 223 + (1 or 0) y 222 + … + (1 or 0) y 20 + (1 or 0) y 2−1 + … + (1 or 0) y 2−23 223 Bit 222 Bit 20 Bit 2−1 Bit 2−23 Bit M0008-02 TAS5508B 8-Channel Digital Audio PWM Processor SLES162B – DECEMBER 2005 – REVISED APRIL 2006 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). 2.3.2.2 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 have 25 bits to the left of the decimal point and 23 bits to the right of the decimal point. This is shown in Figure 2-7. Figure 2-7. 25.23 Format Figure 2-8 shows the derivation of the decimal value of a 48-bit 25.23 format number. Figure 2-8. Conversion Weighting Factors—25.23 Format to Floating Point Two 32-bit words must be sent over the I2C bus to download a level or threshold coefficient into the TAS5508B. The alignment of the 48-bit, 25.23 formatted coefficient in the 8-byte (two 32-bit words) I2C word is shown in Figure 2-9. 28 Description |
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