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Overview

Description

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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, FS/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 FS/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)

Comparison

Applications

Documentation

Type Title Date
Datasheet PDF 599 KB
End Of Life Notice PDF 200 KB
Product Change Notice PDF 98 KB
Application Note PDF 232 KB
Application Note PDF 524 KB
5 items

Design & Development

Software & Tools

Software Downloads

Type Title Date
Library PDF 236 KB
1 item

Models

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

Diagram of ECAD Models

Product Options

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