Analog Devices ADSP-2181 Application Note AN-400

About this manual

This document is an application note titled 'Considerations for Selecting a DSP Processor—Why Buy the ADSP-2181?' published by Analog Devices. It argues that the ADSP-2181 is the optimal choice for high-performance, fixed-point DSP applications due to its ability to provide necessary memory, I/O, and interface support in a single chip.

The text compares the ADSP-2181 with the Texas Instruments TMS320C5x series and the Motorola DSP56000 series. It details specific advantages of the ADSP-2181, including 32K words of on-chip RAM (compared to 9.5K for the nearest competitor), a glue-less interface for off-chip RAM and I/O peripherals, and integrated 8 and 16-bit DMA support. The note also analyzes typical DSP algorithms and their memory requirements to demonstrate why the ADSP-2181's architecture reduces system costs and design complexity.

What's inside

• Introduction
• Comparing the DSP Processors
• Typical DSP Algorithms
• Internal DSP RAM Size
• External Memory and I/O Interface
• System Design Simplicity
• TMS320C5x Features
• DSP56000 Features
• Comparison Results

Specifications

Frequently asked questions

How much on-chip RAM does the ADSP-2181 provide?

The processor provides 32K words of on-chip RAM.

What is the minimum access time required for SRAM when using a DSP with an instruction rate of 25 MIPS or higher?

SRAM must have access times of 15 ns or less.

What is the nominal memory access time for a TMS320C52 operating at 80 MHz?

The nominal memory access time is 12 ns.