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LF43891

Part Number	LF43891
Manufacturer	LOGIC Devices Incorporated
Description	9 x 9-bit Digital Filter
Published	Mar 22, 2005
Detailed Description	LF43891 DEVICES INCORPORATED 9 x 9-bit Digital Filter LF43891 DEVICES INCORPORATED 9 x 9-bit Digital Filter DESCRIPT...
Datasheet	LF43891 PDF File

Overview

LF43891 DEVICES INCORPORATED 9 x 9-bit Digital Filter LF43891 DEVICES INCORPORATED 9 x 9-bit Digital Filter DESCRIPTION The LF43891 is a video-speed digital filter that contains eight filter cells (taps) cascaded internally and a shiftand-add output stage.
A 9 x 9 multiplier, three decimation registers, and a 26-bit accumulator are contained in each filter cell.
The output stage of the LF43891 contains a 26-bit accumulator which can add the contents of any filter stage to the output stage accumulator shifted right by 8 bits.
8-bit unsigned or 9-bit two’s complement format for data and coefficients can be independently selected.
Expanded coefficients and word sizes can be processed by cascading multiple LF43891s to implement larger filter lengths without affecting the sample rate.
By reducing the sample rate, a single LF43891 can process larger filter lengths by using multiple passes.
The sampling rate can range from 0 to 40 MHz.
Over 1000 taps may be processed without overflows due to the architecture of the device.
The output sample rate can be reduced to one-half, one-third, or onefourth the input sample rate by using the three decimation registers contained in every filter cell.
Matrix multiplication, N x N spatial correlations/convolutions, and other 2-D operations for image processing can also be achieved using these registers.
FEATURES u u u u 30 MHz Maximum Sampling Rate 320 MHz Multiply-Accumulate Rate 8 Filter Cells 8-bit Unsigned or 9-bit Two’s Complement Data/Coefficients u 26-bit Data Outputs u Shift-and-Add Output Stage for Combining Filter Outputs u Expandable Data Size, Coefficient Size, and Filter Length u User-Selectable 2:1, 3:1, or 4:1 Decimation u Replaces Harris HSP43891 u 84-pin PLCC, J-Lead LF43891 BLOCK DIAGRAM DIN8-0 9 DIENB, CIENB, ERASE, DCM1-0 5 CIN8-0 9 FILTER CELL 0 9 FILTER CELL 1 9 FILTER CELL 2 9 FILTER CELL 3 9 FILTER CELL 4 9 FILTER CELL 5 9 FILTER CELL 6 9 FILTER CELL 7 9 COUT8-0 ADR2-0 3 26 26 26 26 2...

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