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参数资料
| 型号： | LF43168QC30 |
| 厂商： | LOGIC DEVICES INC |
| 元件分类： | 数字信号处理外设 |
| 英文描述： | Dual 8-Tap FIR Filter |
| 中文描述： | 10-BIT, DSP-DIGITAL FILTER, PQFP100 |
| 封装： | PLASTIC, QFP-100 |
| 文件页数： | 9/16页 |
| 文件大小： | 184K |
| 代理商： | LF43168QC30 |
DEVICES INCORPORATED
Video Imaging Products
9
LF43168
Dual 8-Tap FIR Filter
03/28/2000–LDS.43168-H
Interleaved Coefficient Filters
Figure 7 shows the filter configuration
when the device is programmed for
interleaved coefficients. An inter-
leaved coefficient set contains two
separate odd-tap, even-symmetric
coefficient sets which have been
interleaved together (see Figure 8). If
two data sets are interleaved into the
same serial data stream, they can both
be filtered by different coefficient sets
if the two coefficient sets are also
interleaved. The LF43168 is config-
ured as an interleaved coefficient filter
by programming the device for
interleaved coefficient sets, even-
symmetric coefficients, odd number of
filter taps, and data reversal disabled.
Note that coefficient 3, in Figure 7,
must be divided by two to get the
correct result.
Asymmetric Coefficient Filters
It is possible to have asymmetric
coefficient filters. Asymmetric coeffi-
cient sets do not exhibit even or odd
symmetric properties. A 4-tap asym-
metric filter is possible by putting the
device in even-tap, pass A mode and
then feeding the asymmetric coeffi-
cient set to the multipliers. An 8-tap
asymmetric filter is possible if the
device is clocked twice as fast as the
input data rate. It will take two CLK
cycles to calculate the output. On the
first CLK cycle, the reverse decimation
path is selected to feed data to the
filter multipliers. On the second CLK
cycle, the coefficients sent to the
multipliers are changed (if necessary)
and the forward decimation path is
selected to feed data to the filter
multipliers.
F
IGURE
8.
I
NTERLEAVED
C
OEFFICIENT
S
ET
E
XAMPLE
Interleaved Coefficient Set
Consisting of Sets A and B
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
Odd-Tap, Even-Symmetric
Coefficient Set B
1
2
3
4
5
Odd-Tap, Even-Symmetric
Coefficient Set A
6
7
6
7
11
12
13
14
F
IGURE
7.
I
NTERLEAVED
C
OEFFICIENT
F
ILTER
C
ONFIGURATION
COEF 0
COEF 1
COEF 2
B + A
A
B
B + A
A
B
B + A
A
B
B + A
A
B
DATA IN
ODD-TAP INTERLEAVED FILTER
N
N
N
N
N
N
N = Delay Length (Decimation Factor)
N
COEF 3
2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LF43168QI15 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital Filter |
| LF43168QI22 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital Filter |
| LF43168QI30 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital Filter |
| LF-432 | 制造商:SIRENZA 制造商全称:SIRENZA 功能描述:Wideband RF/Pulse Transformers .1-50 MHz/.01-25 MHz |
| LF43881 | 制造商:LOGIC 制造商全称:LOGIC 功能描述:8 x 8-bit Digital Filter |
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