HSP43124_07 Datasheet, PDF (1/18 Pages) Intersil Corporation – Serial I/O Filter

®
Data Sheet
April 18, 2007
HSP43124
FN3555.7
Serial I/O Filter
The Serial I/O Filter is a high performance filter engine that is
ideal for off loading the burden of filter processing from a DSP
microprocessor. It supports a variety of multistage filter
configurations based on a user programmable filter and fixed
coefficient halfband filters. These configurations include a
programmable FIR filter of up to 256 taps, a cascade of from
one to five halfband filters, or a cascade of halfband filters
followed by a programmable FIR. The half band filters each
decimate by a factor of two, and the FIR filter decimates from
one to eight. When all six filters are selected, a maximum
decimation of 256 is provided.
For digital tuning applications, a separate multiplier is provided
which allows the incoming data stream to be multiplied, or
mixed, by a user supplied mix factor. A two pin interface is
provided for serially loading the mix factor from an external
source or selecting the mix factor from an on-board ROM. The
on-board ROM contains samples of a sinusoid capable of
spectrally shifting the input data by one quarter of the sample
rate, F_S/4. This allows the chip to function as a digital down
converter when the filter stages are configured as a low-pass
filter.
The serial interface for 3- input and output data is compatible
with the serial ports of common DSP microprocessors.
Coefficients and configuration data are loaded over a
bidirectional eight bit interface.
Features
• 45MHz Clock Rate
• 256 Tap Programmable FIR Filter
• 24-Bit Data, 32-Bit Coefficients
• Cascade of up to 5 Half Band Filters
• Decimation from 1 to 256
• Two Pin Interface for Down Conversion by F_S/4
• Multiplier for Mixing or Scaling Input with an External
Source
• Serial I/O Compatible with Most DSP Microprocessors
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Low Cost FIR Filter
• Filter Co-Processor
• Digital Tuner
Ordering Information
PART NUMBER
PART MARKING
TEMP.
RANGE (°C)
PACKAGE
PKG. NO.
HSP43124SC-45
HSP43124SC-45
0 to +70
28 Ld SOIC (300 mil)
M28.3
HSP43124SC-45Z (Note) HSP43124SC-45Z
0 to +70
28 Ld SOIC (300 mil, Pb-free)
M28.3
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Block Diagram
DIN
SCLK
SYNCIN
MXIN
SYNCMX
HALF
BAND
FILTER
#1
HALF
BAND
FILTER
#2
HALF
BAND
FILTER
#5
DOUT
SYNCOUT
CLKOUT
CONTROL
INTERFACE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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