2172

ADSP-2172 Digital Signal Processor (DSP) Technical Summary

Overview

The ADSP-2172 is a high-performance, single-chip microcomputer from Analog Devices optimized for digital signal processing (DSP) and other high-speed numeric processing applications. As part of the ADSP-2100 family, it maintains code and function compatibility while offering enhanced features. The ADSP-2172 is designed for 5.0V applications and includes 8K words of on-chip program ROM, making it particularly suitable for embedded applications requiring fixed program storage.

This DSP combines the ADSP-2100 base architecture with significant memory resources and peripheral interfaces, delivering 33 MIPS performance at 5.0V operation. Its Harvard architecture and parallel computational units enable single-cycle instruction execution for demanding signal processing tasks.

Key Features

• High Performance: 30 ns instruction cycle time (33 MIPS) at 5.0V operation with 16.67 MHz crystal
• Memory Configuration:
  • 2K words (16-bit) of on-chip program memory RAM
  • 2K words (24-bit) of on-chip data memory RAM
  • 8K words (24-bit) of on-chip program memory ROM (ADSP-2172 specific)
• Computational Power:
  • Independent ALU, multiplier/accumulator (MAC), and barrel shifter units
  • Single-cycle instruction execution
  • Multifunction instructions
• I/O Capabilities:
  • 8- or 16-bit parallel host interface port
  • Two double-buffered serial ports with companding hardware
  • Programmable 16-bit interval timer with prescaler
• Power Management: 300 mW typical power dissipation at 5.0V with powerdown mode featuring less than 0.55 mW standby power
• Development Support: Comprehensive software tools including assembler, linker, simulator, and C compiler

Applications

The ADSP-2172 is designed for demanding signal processing applications across multiple industries:

• Audio Processing: Digital audio effects, compression, and synthesis
• Telecommunications: Modems, cellular base stations, and voice processing
• Industrial Control: Motor control, power monitoring, and instrumentation
• Medical Equipment: Ultrasound, imaging, and diagnostic systems
• Military/Aerospace: Radar, sonar, and secure communications
• Consumer Electronics: Advanced audio/video equipment and gaming systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +7.0V
• Input Voltage: -0.3V to VDD + 0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VDD): 4.75V to 5.25V
• Operating Temperature: Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
• Clock Frequency: Up to 16.67 MHz (30 ns cycle time)

Power Consumption

• Active Mode: 300 mW typical at 5.0V, 30 ns cycle time
• Standby Mode: Less than 0.55 mW with 100 cycle recovery

Architecture Details

The ADSP-2172 features a modified Harvard architecture with three separate bus structures for program memory, data memory, and I/O. Key architectural components include:

Computational Units

• Arithmetic Logic Unit (ALU): 24-bit fixed-point processor with parallel execution capabilities
• Multiplier/Accumulator (MAC): 16x16-bit multiplier with 40-bit accumulator for single-cycle multiply-accumulate operations
• Barrel Shifter: Supports arithmetic and logical shifts, normalization, and bit manipulation

Memory Architecture

• Program Memory: 8Kx24 ROM + 2Kx16 RAM for flexible program storage
• Data Memory: 2Kx24 RAM for efficient data handling
• Dual-Purpose Memory: Program memory can store both instructions and data

Data Address Generators (DAGs)

• Two independent DAGs for simultaneous operand fetching
• Support for modulo and bit-reversed addressing modes

Package Information

The ADSP-2172 is available in two package options:

• 128-Lead Thin Quad Flat Pack (TQFP):
  • Package dimensions: 14mm x 14mm body
  • Lead pitch: 0.4mm
  • Low-profile design for space-constrained applications
• 128-Lead Plastic Quad Flat Pack (PQFP):
  • Package dimensions: 28mm x 28mm body
  • Lead pitch: 0.65mm
  • Standard package for easier handling and prototyping

Development Support

Analog Devices provides comprehensive development tools for the ADSP-2172:

• Software Tools:
  • ADSP-2100 Family Development Software with System Builder
  • Algebraic syntax assembler with debugging support
  • Linker for creating executable files
  • Instruction-level simulator with configurable interface
  • PROM splitter utility
  • GNU-based C compiler with runtime library
• Hardware Support:
  • Evaluation boards for rapid prototyping
  • Emulators for in-circuit debugging
  • JTAG-based boundary scan support

Conclusion

The ADSP-2172 represents a powerful, integrated solution for digital signal processing applications requiring both performance and on-chip program storage. Its combination of computational power, memory resources, and peripheral interfaces makes it particularly suitable for embedded DSP applications where fixed program functionality is required. The device's low power consumption in both active and standby modes, coupled with its comprehensive development support, provides engineers with a robust platform for implementing sophisticated signal processing algorithms in a wide range of applications.