LF43168 datasheet(7/16 Pages) LODEV

номер детали	LF43168

подробное описание детали	Dual 8-Tap FIR Filter

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производитель	LODEV [LOGIC Devices Incorporated]

домашняя страница	http://www.logicdevices.com

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DEVICES INCORPORATED

Video Imaging Products

7

LF43168

Dual 8-Tap FIR Filter

03/28/2000–LDS.43168-H

output to 16 bits, bits 5-8 of Control

Register 1 should be set to “0011”. This

will cause a “1” to be added to bit

position 2–7.

Symmetric Coefficients

The LF43168 filter architecture is

optimized for symmetric filter coeffi-

cient sets. Figure 3 shows examples of

the different types of symmetric

coefficient sets. In even-symmetric

sets, each coefficient value appears

twice (except in odd-tap sets where

the middle value appears only once).

In odd-symmetric sets, each coefficient

appears twice, but one value is

positive and one is negative. If the

two data input values that will be

multiplied by the same coefficient are

added or subtracted before being sent

to the filter multiplier, the number of

multipliers needed for an N-tap filter

is cut in half. Therefore, an 8-tap filter

can be implemented with four multi-

pliers if a symmetric coefficient set is

used.

FILTER CONFIGURATIONS

Figures 4-6 show the data paths from

filter input to filter multipliers for all

symmetric coefficient filters. Figure 7

shows the interleaved coefficient filter

configuration. Each diagram shows

one of the two FIR filters when the

device is configured for dual filter

mode. The diagrams can be expanded

to include both filters when the device

is configured for single filter mode.

Even-Symmetric Coefficient Filters

Figure 4 shows the two possible

configurations when the device is

programmed for even-symmetric

coefficients and no decimation.

Note that coefficient 3 on the odd-

tap filter must be divided by two to

get the correct result (The coefficient

must be input to the device already

divided by two).

FIGURE 3.

SYMMETRIC COEFFICIENT SET EXAMPLES

1

2

3

4

5

6

7

8

Even-Tap, Even-Symmetric

Coefficient Set

Odd-Tap, Even-Symmetric

Coefficient Set

1

2

3

4

5

6

7

8

Even-Tap, Odd-Symmetric

Coefficient Set

1

2

3

4

5

6

7

FIGURE 4.

EVEN-SYMMETRIC COEFFICIENT FILTER CONFIGURATIONS (NO DECIMATION)

COEF 0

COEF 1

COEF 2

COEF 3

B + A

AB

B + A

AB

B + A

AB

B + A

AB

DATA IN

EVEN-TAP FILTER

COEF 0

COEF 1

COEF 2

COEF 3

B + A

AB

B + A

AB

B + A

AB

B + A

AB

DATA IN

2

ODD-TAP FILTER

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