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TAS5508APAGG4 Datasheet(PDF) 24 Page - Texas Instruments

Part No. TAS5508APAGG4
Description  8 Channel Digital Audio PWM Processor
Download  99 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TAS5508APAGG4 Datasheet(HTML) 24 Page - Texas Instruments

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Introduction
16
SLES119 − September 2004
TAS5508A
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 TAS5508A.
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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