HSP43124 Datasheet, PDF(1/17 Page) Intersil Corporation

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HSP43124 Datasheet, PDF (1/17 Pages) Intersil Corporation – Serial I/O Filter

Data Sheet

HSP43124

May 1999 File Number 3555.6

Serial I/O Filter

The Serial I/O Filter is a high performance ï¬lter engine that is

ideal for off loading the burden of ï¬lter processing from a

DSP microprocessor. It supports a variety of multistage ï¬lter

conï¬gurations based on a user programmable ï¬lter and ï¬xed

coefï¬cient halfband ï¬lters. These conï¬gurations include a

programmable FIR ï¬lter of up to 256 taps, a cascade of from

one to ï¬ve halfband ï¬lters, or a cascade of halfband ï¬lters

followed by a programmable FIR. The half band ï¬lters each

decimate by a factor of two, and the FIR ï¬lter decimates from

one to eight. When all six ï¬lters 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, FS/4. This allows the chip to

function as a digital down converter when the ï¬lter stages

are conï¬gured as a low-pass ï¬lter.

The serial interface for3- input and output data is compatible

with the serial ports of common DSP microprocessors.

Coefï¬cients and conï¬guration data are loaded over a

bidirectional eight bit interface.

Block Diagram

Features

â¢ 45MHz Clock Rate

â¢ 256 Tap Programmable FIR Filter

â¢ 24-Bit Data, 32-Bit Coefï¬cients

â¢ Cascade of up to 5 Half Band Filters

â¢ Decimation from 1 to 256

â¢ Two Pin Interface for Down Conversion by FS/4

â¢ Multiplier for Mixing or Scaling Input with an External

Source

â¢ Serial I/O Compatible with Most DSP Microprocessors

Applications

â¢ Low Cost FIR Filter

â¢ Filter Co-Processor

â¢ Digital Tuner

Ordering Information

PART NUMBER

HSP43124PC-45

HSP43124PC-33

TEMP.

RANGE (oC)

PACKAGE

0 to 70 28 Ld PDIP

HSP43124SC-45

HSP43124SC-33

HSP43124SI-40

0 to 70

-40 to 85

28 Ld SOIC

PKG.

NO.

E28.6

M28.3

DIN

SCLK

SYNCIN

MXIN

SYNCMX

HALF

BAND

FILTER

HALF

BAND

FILTER

CONTROL

INTERFACE

HALF

BAND

FILTER

DOUT

SYNCOUT

CLKOUT

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

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