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TAS5708 データシート(PDF) 29 Page - Texas Instruments

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部品番号 TAS5708
部品情報  20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ/DRC and FEEDBACK
PDF  56 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

TAS5708 データシート(HTML) 29 Page - Texas Instruments

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(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
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
TAS5708
www.ti.com ........................................................................................................................................................................................... SLOS570 – DECEMBER 2008
The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 35. 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 36 applied to obtain the magnitude
of the negative number.
Figure 36. 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 37
Figure 37. Alignment of 3.23 Coefficient in 32-Bit I2C Word
Sample calculation for 3.23 format
db
Linear
Decimal
Hex (3.23 Format)
0
1
8388608
00800000
5
1.7782794
14917288
00E39EA8
-5
0.5623413
4717260
0047FACC
X
L = 10(X/20)
D = 8388608 × L
H = dec2hex (D, 8)
Sample calculation for 9.17 format
db
Linear
Decimal
Hex (9.17 Format)
0
1
131072
00020000
5
1.7782794
233082.6
00038E7A
-5
0.5623413
73707.2
00011FEB
X
L = 10(X/20)
D = 131072 × L
H = dec2hex (D, 8)
Copyright © 2008, Texas Instruments Incorporated
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