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September 1997
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HSP43481
Digital Filter
Description
The HSP43481 is a video-speed Digital Filter (DF) designed
to efficiently implement vector operations such as FIR digital
filters. It is comprised of four filter cells cascaded internally
and a shift-and-add output stage, all in a single integrated
circuit. Each filter cell contains an 8 x 8 multiplier, three dec-
imation registers and a 26-bit accumulator which can add
the contents of any filter cell accumulator to the output stage
accumulator shifted right by eight-bits. The HSP43481 has a
maximum sample rate of 30MHz. The effective multiply-
accumulate (MAC) rate is 120MHz.
The HSP43481 can be configured to process expanded
coefficient and word sizes. Multiple devices can be cas-
caded for larger filter lengths without degrading the sample
rate or a single device can process larger filter lengths at
less than 30MHz with multiple passes. The architecture per-
mits processing filter lengths of over 1000 taps with the guar-
antee of no overflows. In practice, most filter coefficients are
less than 1.0, making even larger filter lengths possible. The
HSP43481 provides for unsigned or two鈥檚 complement arith-
metic, independently selectable for coefficients and signal
data.
Each DF filter cell contains three resampling or decimation
registers which permit output sample rate reduction at rates of
1
/
2
,
1
/
3
or
1
/
4
the input sample rate. These registers also pro-
vide the capability to perform 2-D operations such as N x N
spatial correlations/convolutions for image processing appli-
cations.
鈥?Four Filter Cells
鈥?0MHz to 30MHz Sample Rate
鈥?8-Bit Coefficients and Signal Data
鈥?26-Bit Accumulator per Stage
鈥?Filter Lengths Up to 1032 Tap
鈥?Expandable Coefficient Size, Data Size and Filter
Length
鈥?Decimation by 2, 3 or 4
Applications
鈥?1-D and 2-D FIR Filters
鈥?Radar/Sonar
鈥?Adaptive Filters
鈥?Echo Cancellation
鈥?Complex Multiply-Add
鈥?Sample Rate Converters
Ordering Information
PART NUMBER
HSP43481JC-20
HSP43481JC-25
HSP43481JC-30
HSP43481GC-20
HSP43481GC-25
HSP43481GC-30
TEMPERA-
TURE RANGE
0
o
C to +70
o
C
0
o
C to +70
o
C
0
o
C to +70
o
C
0
o
C to +70
o
C
0 C to +70 C
0
o
C to +70
o
C
o
o
PACKAGE
68 Lead PLCC
68 Lead PLCC
68 Lead PLCC
68 Lead PGA
68 Lead PGA
68 Lead PGA
Block Diagram
V
CC
DIENB
CIENB
DCM0 - DCM1
ERASE
TCCI
CIN0 - CIN7
RESET
CLK
ADR0 - 1
8
4
V
SS
DIN0 - DIN7 TCS
8
5
8
FILTER
CELL 0
4
2
MUX
RESET
CLK
SHADD
SENBL
SENBH
2
ADR0, ADR1
2
26
OUTPUT
STAGE
26
26
8
8
FILTER
CELL 1
26
8
8
FILTER
CELL 2
26
8
8
FILTER
CELL 3
26
TCCO
8
COUT0 - COUT 7
COENB
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2002. All Rights Reserved
3-1
File Number
2759.4
DB302
1
