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TAS5721 Datasheet(PDF) 58 Page - Texas Instruments

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Part # TAS5721
Description  Digital Audio Power Amplifier with EQ, DRC, 2.1 Support, and Headphone/Line Driver
PDF  71 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TAS5721 Datasheet(HTML) 58 Page - Texas Instruments

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background image
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
(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
TAS5721
SLOS739 – JULY 2012
www.ti.com
The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 68. 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 69 applied to obtain the magnitude
of the negative number.
Figure 69. 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 70
Figure 70. Alignment of 3.23 Coefficient in 32-Bit I2C Word
Table 22. Sample Calculation for 3.23 Format
dB
Linear
Decimal
Hex (3.23 Format)
0
1
8,388,608
0080 0000
5
1.7782794
14,917,288
00E3 9EA8
–5
0.5623413
4,717,260
0047 FACC
X
L = 10(X/20)
D = 8,388,608 × L
H = dec2hex (D, 8)
Table 23. Sample Calculation for 9.17 Format
dB
Linear
Decimal
Hex (9.17 Format)
0
1
131,072
2 0000
5
1.77
231,997
3 8A3D
–5
0.56
73,400
1 1EB8
X
L = 10(X/20)
D = 131,072 × L
H = dec2hex (D, 8)
58
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: TAS5721



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