1

File Number

2785.5

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999

HSP43891

Digital Filter

The HSP43891 is a video-speed Digital Filter (DF)

designed to efficiently implement vector operations such as

FIR digital filters. It is comprised of eight filter cells

cascaded internally and a shift and add output stage, all in

a single integrated circuit. Each filter cell contains a 9x9

two’s complement multiplier, three decimation registers and

a 26-bit accumulator. The output stage contains an

additional 26-bit accumulator which can add the contents of

any filter cell accumulator to the output stage accumulator

shifted right by 8-bits. The HSP43891 has a maximum

sample rate of 30MHz. The effective multiply-accumulate

(mac) rate is 240MHz.

The HSP43891 DF can be configured to process expanded

coefficient and word sizes. Multiple DFs can be cascaded

for larger filter lengths without degrading the sample rate or

a single DF can process larger filter lengths at less than

30MHz with multiple passes. The architecture permits

processing filter lengths of over 1000 taps with the

guarantee of no overflows. In practice, most filter

coefficients are less than 1.0, making even larger filter

lengths possible. The DF provides for 8-bit unsigned or

9-bit two’s complement arithmetic, 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

provide the capability to perform 2-D operations such as

matrix multiplication and NxN spatial

correlations/convolutions for image processing applications.

Features

• Eight Filter Cells

• 0MHz to 30MHz Sample Rate

• 9-Bit Coefficients and Signal Data

• 26-Bit Accumulator per Stage

• Filter Lengths Over 1000 Taps

• Expandable Coefficient Size, Data Size and Filter Length

• Decimation by 2, 3 or 4

Applications

• 1-D and 2-D FIR Filters

• Radar/Sonar

• Digital Video

• Adaptive Filters

• Echo Cancellation

• Complex Multiply-Add

- Sample Rate Converters

Block Diagram

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG. NO.

HSP43891VC-20

0 to 70

100 Lead MQFP Q100.14x20

HSP43891VC-25

0 to 70

100 Lead MQFP Q100.14x20

HSP43891VC-30

0 to 70

100 Lead MQFP Q100.14x20

HSP43891JC-20

0 to 70

84 Lead PLCC

N84.1.15

HSP43891JC-25

0 to 70

84 Lead PLCC

N84.1.15

HSP43891JC-30

0 to 70

84 Lead PLCC

N84.1.15

HSP43891GC-20

0 to 70

85 Pin CPGA

G85.A

HSP43891GC-25

0 to 70

85 Pin CPGA

G85.A

HSP43891GC-30

0 to 70

85 Pin CPGA

G85.A

CIN0 - 8

DF

FILTER

CELL 7

COUT0 - 8

ERASE

DCM0 - 1

DIENB

CIENB

COENB

MUX

RESET

26

ADR0, ADR1, ADR2

CLK

RESET

SHADD

SENBH

SENBL

OUTPUT

STAGE

DIN0 - DIN8

SUM0 - 25

3

9

DF

FILTER

CELL 6

26

9

DF

FILTER

CELL 5

26

9

DF

FILTER

CELL 4

26

9

DF

FILTER

CELL 3

26

9

DF

FILTER

CELL 2

26

9

DF

FILTER

CELL 1

26

9

DF

FILTER

CELL 0

26

9

9

5

5

2

26

26

2

9

5

CLK

ADRO - 2

Data Sheet

May 1999