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LF43881JC40 Datasheet دیتاشیت PDF دانلود

دیتاشیت - LOGIC Devices Incorporated - 8 x 8-bit Digital Filter

شماره قطعه LF43881JC40
شرح مفصل 8 x 8-bit Digital Filter
تولید کننده LOGIC Devices Incorporated 
آرم LOGIC Devices Incorporated 


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LF43881JC40 شرح
DEVICES INCORPORATED
DEVICES INCORPORATED
LF43881
8 x 8-LbiFt D4ig3it8al8Fi1lter
8 x 8-bit Digital Filter
FEATURES
DESCRIPTION
u 25 MHz Maximum Sampling Rate
u 320 MHz Multiply-Accumulate Rate
u 8 Filter Cells
u 8-bit Unsigned or Two’s Complement
Data
u 8-bit Unsigned or Two’s Complement
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 HSP43881
u 84-pin PLCC, J-Lead
The LF43881 is a video-speed digital
filter that contains eight filter cells
(taps) cascaded internally and a shift-
and-add output stage. An 8 x 8
multiplier, three decimation registers,
and a 26-bit accumulator are con-
tained in each filter cell. The output
stage of the LF43881 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 two’s
complement format for data and
coefficients can be independently
selected.
Expanded coefficients and word sizes
can be processed by cascading mul-
tiple LF43881s to implement larger
filter lengths without affecting the
sample rate. By reducing the sample
rate, a single LF43881 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.
LF43881 BLOCK DIAGRAM
DIN7-0
8
DIENB, CIENB,
ERASE, DCM1-0
5
TCS
TCCI
CIN7-0
8
3
ADR2-0
FILTER
CELL 0 8
26
FILTER
CELL 1 8
26
FILTER
CELL 2 8
26
FILTER
CELL 3 8
26
FILTER
CELL 4 8
26
FILTER
CELL 5 8
26
FILTER
CELL 6 8
26
FILTER
CELL 7 8
TCCO
COUT7-0
COENB
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.43881-J

قانون اساسیصفحه 11
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دیتاشیت توصیه

شماره قطعه شرح مفصل تولید کنندگان
LF43881JC40 8 x 8-bit Digital Filter LOGIC Devices Incorporated
LOGIC Devices Incorporated

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