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TAS5518 Datasheet(PDF) 25 Page - Texas Instruments

Part # TAS5518
Description  8 Channel Digital Audio PWM Processor
PDF  103 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TAS5518 Datasheet(HTML) 25 Page - Texas Instruments

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Introduction
16
SLES115 — August 2004
TAS5518
1.5.2.2
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 1−10.
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
Figure 1−10. 25.23 Format
Figure 1−11 shows the derivation of the decimal value of a 48-bit 25.23 format number.
(1 or 0) x 223 + (1 or 0) x 222 + … + (1 or 0) x 20 + (1 or 0) x 2−1 + … + (1 or 0) x 2−23
223 Bit
222 Bit
20 Bit
2−1 Bit
2−23 Bit
Figure 1−11. Alignment of 5.23 Coefficient in 32-Bit I2C Word
Two 32-bit words must be sent over the I2C bus to download a level or threshold coefficient into the TAS5518.
The alignment of the 48-bit, 25.23 formatted coefficient in the 8-byte (two 32-bit words) I2C word is shown in
Figure 1−12.



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