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LF43891JC40 fiches techniques PDF

LOGIC Devices Incorporated - 9 x 9-bit Digital Filter

Numéro de référence LF43891JC40
Description 9 x 9-bit Digital Filter
Fabricant LOGIC Devices Incorporated 
Logo LOGIC Devices Incorporated 





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LF43891JC40 fiche technique
DEVICES INCORPORATED
DEVICES INCORPORATED
LF43891
9 x 9-LbiFt D4ig3it8al9Fi1lter
9 x 9-bit Digital Filter
FEATURES
DESCRIPTION
u 30 MHz Maximum Sampling Rate
u 320 MHz Multiply-Accumulate Rate
u 8 Filter Cells
u 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
The LF43891 is a video-speed digital
filter that contains eight filter cells
(taps) cascaded internally and a shift-
and-add output stage. A 9 x 9 multi-
plier, 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 accu-
mulator 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 mul-
tiple 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 re-
duced to one-half, one-third, or one-
fourth the input sample rate by using
the three decimation registers con-
tained in every filter cell. Matrix
multiplication, N x N spatial correla-
tions/convolutions, and other 2-D
operations for image processing can
also be achieved using these registers.
LF43891 BLOCK DIAGRAM
DIN8-0
9
DIENB, CIENB,
ERASE, DCM1-0
5
9
CIN8-0
FILTER 9
CELL 0
FILTER 9
CELL 1
FILTER 9
CELL 2
FILTER 9
CELL 3
FILTER 9
CELL 4
FILTER 9
CELL 5
FILTER 9
CELL 6
FILTER 9 COUT8-0
CELL 7
3
ADR2-0
COENB
26 26 26 26 26 26 26 26
SHADD
SENBL
SENBH
RESET
CLK
TO ALL CELLS
TO ALL REGISTERS
MUX
26
OUTPUT
STAGE
26
SUM25-0
1
Video Imaging Products
08/16/2000–LDS.43891-J

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