參數(shù)資料
型號： TLV320AIC3120IRHBR
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(shù)： 91/150頁
文件大?。?/td> 1507K
代理商： TLV320AIC3120IRHBR
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
SLAS653 – FEBRUARY 2010
Table 5-20. Adaptive-Mode Filter-Coefficient Buffer Switching
DAC
Page 8,
Coefficient
Powered
Reg 1,
Buffer
I2C Writes to
Updates
Up
Bit D1
in Use
No
0
None
Page 8 / register 2 and page 8 / register 3, buffer
A
No
0
None
Page 12 / register 2 and page 12 / register 3,
buffer B
Yes
0
Buffer A
Page 8 / register 2 and page 8 / register 3, buffer
Page 12 / register 2 and page 12 / register 3,
A
buffer B
Yes
0
Buffer A
Page 12 / register 2 and page 12 / register 3,
buffer B
Yes
1
Buffer B
Page 8 / register 2 and page 8 / register 3, buffer
A
Yes
1
Buffer B
Page 12 / register 2 and page 12 / register 3,
Page 8 / register 2 and page 8 / register 3, buffer
buffer B
A
The user-programmable coefficients for the DAC processing blocks are defined on page 8 and page 9 for
buffer A and page 12 and page 13 for buffer B.
The coefficients of these filters are each 16-bit, 2s-complement format, occupying 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.
5.6.1.3.1 First-Order IIR Section
The IIR is of first order and its transfer function is given by
(4)
The frequency response for the first-order IIR section with default coefficients is flat.
Table 5-21. DAC IIR Filter Coefficients
DAC Coefficient,
Filter
Filter Coefficient
Default (Reset) Values
Mono Channel
First-order IIR
N0
Page 9 / register 2 and page 9 / register 3
0x7FFF (decimal 1.0 – LSB value)
N1
Page 9 / register 4 and page 9 / register 5
0x0000
D1
Page 9 / register 6 and page 9 / register 7
0x0000
5.6.1.3.2 Biquad Section
The transfer function of each of the biquad filters is given by
(5)
Table 5-22. DAC Biquad Filter Coefficients
Filter
Coefficient
Mono DAC Channel
Default (Reset) Values
Biquad A
N0
Page 8 / register 2 and page 8 / register 3 0x7FFF (decimal 1.0 – LSB value)
N1
Page 8 / register 4 and page 8 / register 5 0x0000
N2
Page 8 / register 6 and page 8 / register 7 0x0000
D1
Page 8 / register 8 and page 8 / register 9 0x0000
D2
Page 8 / register 10 and page 8 / register
0x0000
11
Copyright 2010, Texas Instruments Incorporated
APPLICATION INFORMATION
45
Product Folder Link(s): TLV320AIC3120
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