2171

ADSP-2171/ADSP-2172/ADSP-2173 Digital Signal Processors

Overview

The ADSP-2171, ADSP-2172, and ADSP-2173 are high-performance single-chip microcomputers optimized for digital signal processing (DSP) and other high-speed numeric processing applications. These processors belong to Analog Devices' ADSP-2100 family and are designed to deliver exceptional computational performance while maintaining low power consumption. The ADSP-2171 and ADSP-2172 are tailored for 5.0 V applications, while the ADSP-2173 is optimized for 3.3 V systems. The ADSP-2172 variant includes an additional 8K words (24-bit) of on-chip program ROM, making it suitable for embedded applications requiring fixed program storage.

Key Features

• High-Speed Performance: 30 ns instruction cycle time (33 MIPS) at 5.0 V (ADSP-2171/2172) and 50 ns (20 MIPS) at 3.3 V (ADSP-2173).
• Memory Configuration:
  • 2K words of on-chip program memory RAM
  • 2K words of on-chip data memory RAM
  • 8K words of on-chip program memory ROM (ADSP-2172 only)
• Computational Units: Independent ALU, multiplier/accumulator (MAC), and barrel shifter for parallel processing.
• Host Interface: 8- or 16-bit parallel host interface port for easy integration with external controllers.
• Low Power Consumption:
  • 300 mW typical power dissipation at 5.0 V (30 ns cycle time)
  • 70 mW typical power dissipation at 3.3 V (50 ns cycle time)
• Powerdown Mode: Ultra-low standby power consumption (<0.55 mW for ADSP-2171/2172, <0.36 mW for ADSP-2173) with fast recovery (100 cycles).
• Serial Ports: Two double-buffered serial ports (SPORTs) with companding hardware and automatic data buffering.
• Timer: Programmable 16-bit interval timer with prescaler.
• Interrupts: Three external interrupts (edge- or level-sensitive).
• Package Options: Available in 128-lead TQFP and 128-lead PQFP packages.

Applications

The ADSP-217x series is ideal for a wide range of DSP and high-performance computing applications, including:

• Audio and speech processing (e.g., noise cancellation, voice recognition)
• Telecommunications (modems, echo cancellation)
• Industrial control systems (motor control, real-time monitoring)
• Medical imaging and signal processing
• Automotive systems (sensor processing, infotainment)
• Embedded systems requiring fixed program execution (ADSP-2172 with ROM)

Electrical Characteristics

Operating Conditions

• Supply Voltage:
  • ADSP-2171/2172: 5.0 V ±10%
  • ADSP-2173: 3.3 V ±10%
• Clock Frequency:
  • ADSP-2171/2172: 16.67 MHz (30 ns cycle time)
  • ADSP-2173: 10 MHz (50 ns cycle time)
• Power Dissipation:
  • ADSP-2171/2172: 300 mW typical at 5.0 V
  • ADSP-2173: 70 mW typical at 3.3 V

Memory Specifications

• Program Memory:
  • 2K x 24-bit RAM (all variants)
  • 8K x 24-bit ROM (ADSP-2172 only)
• Data Memory: 2K x 16-bit RAM

I/O Characteristics

• Host Interface Port: 8- or 16-bit parallel, programmable wait state generation
• Serial Ports (SPORTs): Dual, double-buffered, supporting companding (μ-law/A-law)
• Timer: 16-bit programmable interval timer with prescaler

Package Information

The ADSP-217x processors are available in two package options:

• 128-Lead Thin Quad Flat Pack (TQFP): Compact footprint suitable for space-constrained designs.
• 128-Lead Plastic Quad Flat Pack (PQFP): Robust packaging for industrial applications.

Pin Configuration Highlights

• External address and data buses for memory expansion
• Dedicated pins for serial ports (SPORT0 and SPORT1)
• Host interface port pins for parallel communication
• Power and ground pins distributed for optimal noise immunity

Development Support

Analog Devices provides a comprehensive development ecosystem for the ADSP-217x series, including:

• ADSP-2100 Family Development Software: Includes System Builder, Assembler, Linker, and Simulator for hardware and software development.
• C Compiler: Based on GNU C, generating optimized ADSP-217x assembly code.
• Runtime Library: Over 100 ANSI-standard functions for DSP operations.
• PROM Splitter: Utility for generating PROM programmer-compatible files.

Conclusion

The ADSP-2171, ADSP-2172, and ADSP-2173 processors offer a powerful combination of high-speed DSP performance, low power consumption, and flexible memory configurations. Their compatibility with the ADSP-2100 family ensures a smooth migration path for existing designs, while their advanced features make them suitable for next-generation applications in audio, telecommunications, and industrial systems. With robust development tools and multiple package options, these processors provide a versatile solution for demanding signal processing tasks.