HSP43220/883
TM
Data Sheet
March 1999
FN2802.3
Decimating Digital Filter
The HSP43220/883 Decimating Digital Filter is a linear
phase low pass decimation filter which is optimized for
filtering narrow band signals in a broad spectrum of a signal
processing applications. The HSP43220/883 offers a single
chip solution to signal processing application which have
historically required several boards of ICs. This reduction in
component count results in faster development times, as
well as reduction of hardware costs.
The HSP43220/883 is implemented as a two stage filter
structure. As seen in the Block Diagram, the first stage is a
High Order Decimation Filter (HDF) which utilizes an
efficient decimation (sample rate reduction) technique to
obtain decimation up to 1024 through a coarse low-pass
filtering process. The HDF provides up to 96dB aliasing
rejection in the signal pass band. The second stage consists
of a Finite Impulse Response (FIR) decimation filter
structured as a transversal FIR filter with up to 512
symmetric taps which can implement filters with sharp
transition regions. The FIR can perform further decimation
by up to 16 if required, while preserving the 96dB aliasing
attenuation obtained by the HDF. The combined total
decimation capability is 16,384.
The HSP43220/883 accepts 16-bit parallel data in 2鈥檚
complement format at sampling rates up to 30MSPS. It
provides a 16-bit microprocessor compatible interface to
simplify the task of programming and three-state outputs to
allow the connection of several ICs to a common bus. The
HSP43220/883 also provides the capability to bypass either
the HDF or the FIR for additional flexibility.
Features
鈥?This Circuit is Processed in Accordance to MIL-STD-883
and is Fully Conformant Under the Provisions of
Paragraph 1.2.1.
鈥?Single Chip Narrow Band Filter with up to 96dB
Attenuation
鈥?DC to 25.6MHz Clock Rate
鈥?16-Bit 2鈥檚 Complement Input
鈥?20-Bit Coefficients in FIR
鈥?24-Bit Extended Precision Output
鈥?Programmable Decimation up to a Maximum of 16,384
鈥?Standard 16-Bit Microprocessor Interface
鈥?Filter Design Software Available DECI鈥ATE鈩?/div>
Applications
鈥?Very Narrow Band Filters
鈥?Zoom Spectral Analysis
鈥?Channelized Receivers
Ordering Information
PART NUMBER
HSP43220GM-15/883
HSP43220GM-25/883
TEMP.
RANGE (
o
C)
-55 to 125
-55 to 125
PACKAGE
84 Ld PGA
84 Ld PGA
PKG.
NO.
G84.A
G84.A
Block Diagram
DECIMATION UP TO 1024
INPUT CLOCK
DATA INPUT
CONTROL AND COEFFICIENTS
DECIMATION UP TO 16
24
DATA OUT
DATA READY
16
16
HIGH ORDER
DECIMATION
FILTER
FIR
DECIMATION
FILTER
FIR CLOCK
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2002. All Rights Reserved
DECIMATE鈩?is a trademark of Intersil Corporation. IBM PC, XT, AT, PS/2鈩?are trademarks of IBM Corporation.
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