LF43168QC30 datasheet(9/16 Pages) LODEV

部件名	LF43168QC30

功能描述	Dual 8-Tap FIR Filter

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制造商	LODEV [LOGIC Devices Incorporated]

网页	http://www.logicdevices.com

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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.

FIGURE 8.

INTERLEAVED COEFFICIENT SET EXAMPLE

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

FIGURE 7.

INTERLEAVED COEFFICIENT FILTER CONFIGURATION

COEF 0

COEF 1

COEF 2

B + A

AB

B + A

AB

B + A

AB

B + A

AB

DATA IN

ODD-TAP INTERLEAVED FILTER

NNN

N = Delay Length (Decimation Factor)

N

COEF 3

2

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