參數(shù)資料
型號: TAS5518PAG
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: GREEN, PLASTIC, TQFP-64
文件頁數(shù): 24/105頁
文件大小: 1514K
代理商: TAS5518PAG
Introduction
17
SLES115 — August 2004
TAS5518
u
Coefficient
Digit 16
u u u
u u u u
Coefficient
Digit 15
u u u u
Coefficient
Digit 14
u u u u
Coefficient
Digit 13
S x x x
Coefficient
Digit 12
x x x x
Coefficient
Digit 11
x x x x
Coefficient
Digit 10
x x x x
Coefficient
Digit 9
Word 1
(Most
Significant
Word)
Integer
Digit 3
Integer
Digit 4
(Bits 23 21)
Integer
Digit 2
Integer
Digit 1
Sign
Bit
x
Coefficient
Digit 8
x x x
x 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
Word 2
(Least
Significant
Word)
Fraction
Digit 5
Integer
Digit 4
(Bit 20)
0
Fraction
Digit 6
Fraction
Digit 4
Fraction
Digit 3
Fraction
Digit 2
Fraction
Digit 1
Integer
Digit 6
Integer
Digit 5
u = unused or don’t care bits
Digit = hexadecimal digit
Figure 112. Alignment of 25.23 Coefficient in Two 32-Bit I2C Words
1.5.2.3
TAS5518 Audio Processing
The TAS5518 digital audio processing is designed such that noise produced by filter operations is maintained
below the smallest signal amplitude of interest, as shown in Figure 113. The TAS5518 achieves this by
increasing the precision of the signal representation substantially above the number of bits that are absolutely
necessary to represent the input signal.
Maximum Signal
Amplitude
Signal bits
output
Noise Floor as a
result of additional
precision
Ideal Input
Desired Output
Reduced
SNR signal
output
Noise Floor with no
additional precision
Possible Outputs
Filter
Operation
Signal bits
input
Overflow
Values retained by
overflow bits
Figure 113. TAS5518 Digital Audio Processing
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