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| 型号： | TLV320ADC3101IRGER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC24 |
| 封装： | GREEN, PLASTIC, VQFN-24 |
| 文件页数： | 31/84页 |
| 文件大小： | 1363K |
| 代理商： | TLV320ADC3101IRGER |
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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
-
(2)
1
2
0
1
2
15
1
2
1
2
N + 2 × N z
+ N z
H(z) =
2
D z
-
-
(3)
www.ti.com...................................................................................................................................... SLAS553A – NOVEMBER 2008 – REVISED SEPTEMBER 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, as shown in Table 7. 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 43.
Figure 43. 2s-Complement Coefficient Format
First-Order IIR Section
The transfer function for the first-order IIR filter is given by Equation 2.
The frequency response for the first-order IIR section with default coefficients is flat at a gain of 0 dB.
Table 7. ADC First-Order IIR Filter Coefficients
Filter
FIlter Coefficient
ADC Coefficient, Left Channel
ADC Coefficient, Right Channel
N0
C4 (page 4 / register 8, 9)
C36 (page 4 / register 72, 73)
First-order IIR
N1
C5 (page 4 / register 10, 11)
C37 (page 4 / register 74, 75)
D1
C6 (page 4 / register 12, 13)
C38 (page 4 / register 76, 77)
Biquad Section
The transfer function of each of the biquad filters is given by Equation 3.
The frequency response for each of the biquad sections with default coefficients is flat at a gain of 0 dB.
Table 8. ADC Biquad Filter Coefficients
Filter
FIlter Coefficient
ADC Coefficient, Left Channel
ADC Coefficient, Right Channel
BIQUAD A
N0
C7 (page 4 / register 14, 15)
C39 (page 4 / register 78, 79)
N1
C8 (page 4 / register 16, 17)
C40 (page 4 / register 80, 81)
N2
C9 (page 4 / register 18, 19)
C41 (page 4 / register 82, 83)
D1
C10 (page 4 / register 20, 21)
C42 (page 4 / register 84, 85)
D2
C11 (page 4 / register 22, 23)
C43 (page 4 / register 86, 87)
BIQUAD B
N0
C12 (page 4 / register 24, 25)
C44 (page 4 / register 88, 89)
N1
C13 (page 4 / register 26, 27)
C45 (page 4 / register 90, 91)
N2
C14 (page 4 / register 28, 29)
C46 (page 4 / register 92, 93)
D1
C15 (page 4 / register 30, 31)
C47 (page 4 / register 94, 95)
D2
C16 (page 4 / register 32, 33)
C48 (page 4 / register 96, 97)
Copyright 2008–2009, Texas Instruments Incorporated
37
Product Folder Link(s) :TLV320ADC3101
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