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參數資料
型號: TLV320AIC3111IRHBT
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: AUDIO AMPLIFIER, PQCC32
封裝: 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數: 84/156頁
文件大小: 1701K
代理商: TLV320AIC3111IRHBT
LargestPositiveNumber:
=0.111 1111 1111 111
=0.999969482421875=1.0 – 1LSB
1
LargestNegativeNumber:
=1.0000 0000 0000 000
=0x8000= –1.0(bydefinition)
1
S.xxxx xxxx xxxx xxx
..
x
SignBit
2
Bit
–1
2
Bit
–4
2
Bit
–15
Fraction
Point
1
0
1
15
1
N
N z
H(z)
2
D z
-
+
=
-
1
2
0
1
2
15
1
2
1
2
N
2 N z
N z
H(z)
2
2 D z
D z
-
+
+
=
-
-
www.ti.com
SLAS644B – JULY 2009 – REVISED OCTOBER 2009
The coefficients of these filters are each 16 bits wide, in 2s-complement format, and occupy two
consecutive 8-bit registers in the register space. Specifically, the filter coefficients are in 1.15 (one dot 15)
format with a range from –1.0 (0x8000) to 0.999969482421875 (0x7FFF), as shown in Figure 5-12.
Figure 5-12. 1.15 2s-Complement Coefficient Format
5.5.4.3.1 First-Order IIR Section
The transfer function for the first-order IIR filter is given by
(1)
The frequency response for the first-order IIR section with default coefficients is flat at a gain of 0 dB.
Table 5-17. ADC First-Order IIR Filter Coefficients
Filter
Filter Coefficient
ADC Coefficient
Default (Reset) Values
N0
Page 4 / register 8 and page 4 / register 9
0x7FFF (decimal 1.0 – LSB value)
First-order IIR
N1
Page 4 / register 10 and page 4 / register 11
0x0000
D1
Page 4 / register 12 and page 4 / register 13
0x0000
5.5.4.3.2 Biquad Section
The transfer function of each of the biquad filters is given by
(2)
The default values for each biquad section yield an all-pass (flat) frequency response at a gain of 0 dB.
Table 5-18. ADC Biquad Filter Coefficients
Filter
Filter Coefficient
Filter Coefficient RAM Location
Default (Reset) Values
Biquad A
N0
Page 4 / register 14 and page 4 /
0x7FFF (decimal 1.0 – LSB value)
register 15
N1
Page 4 / register 16 and page 4 /
0x0000
register 17
N2
Page 4 / register 18 and page 4 /
0x0000
register 19
D1
Page 4 / register 20 and page 4 /
0x0000
register 21
D2
Page 4 / register 22 and page 4 /
0x0000
register 23
Copyright 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
33
Product Folder Link(s): TLV320AIC3111
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