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TAS5504A Datasheet(PDF) 24 Page - Texas Instruments

Part # TAS5504A
Description  4-Channel Digital Audio PWM Processor
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TAS5504A Datasheet(HTML) 24 Page - Texas Instruments

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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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