參數(shù)資料
型號(hào): TAS5715PHPR
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 41.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
封裝: 7 X 7 MM, GREEN, PLASTIC, HTQFP-48
文件頁(yè)數(shù): 33/74頁(yè)
文件大?。?/td> 2771K
代理商: TAS5715PHPR
(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
Coefficient
Digit6
x
Coefficient
Digit5
x
Coefficient
Digit4
x
Coefficient
Digit3
x
Coefficient
Digit2
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
www.ti.com
SLOS645 – AUGUST 2010
The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 52. 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 53 applied to obtain the magnitude
of the negative number.
Figure 53. 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 54
Figure 54. Alignment of 3.23 Coefficient in 32-Bit I2C Word
Table 1. Sample Calculation for 3.23 Format
db
Linear
Decimal
Hex (3.23 Format)
0
1
8,388,608
80 0000
5
1.77
14,917,288
00E3 9EA8
–5
0.56
4,717,260
0047 FACC
X
L = 10(X/20)
D = 8388608 × L
H = dec2hex (D, 8)
Table 2. Sample Calculation for 9.17 Format
db
Linear
Decimal
Hex (9.17 Format)
0
1
131,072
20 000
5
1.77
231,997
38 A3D
–5
0.56
73,400
11 EB8
X
L = 10(X/20)
D = 131,072 × L
H = dec2hex (D, 8)
Copyright 2010, Texas Instruments Incorporated
39
Product Folder Link(s): TAS5715
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