2187L

Technical Summary: ADSP-2187L Digital Signal Processor

Overview

The ADSP-2187L is a high-performance, single-chip microcomputer optimized for digital signal processing (DSP) and other numerically intensive applications. Manufactured by Analog Devices, this processor combines exceptional computational power with low power consumption, making it ideal for embedded systems requiring real-time signal processing. The ADSP-2187L is part of the ADSP-2100 family, ensuring code compatibility while offering enhanced features such as expanded on-chip memory and improved system integration.

With a 19 ns instruction cycle time at 3.3V operation, the ADSP-2187L delivers sustained performance of 52 million instructions per second (MIPS). Its Harvard architecture and three-bus design enable dual operand fetches in every instruction cycle, maximizing throughput for DSP algorithms. The processor includes comprehensive on-chip peripherals and memory, reducing the need for external components in many applications.

Key Features

• High Performance DSP Core: 19 ns instruction cycle time at 3.3V (52 MIPS sustained performance)
• Efficient Architecture: Three-bus architecture enables dual operand fetches per cycle
• Low Power Operation: Power-down mode with 400 cycle recovery and idle mode for reduced power consumption
• Large On-Chip Memory: 160KB RAM configured as 32K words program memory and 32K words data memory
• Computational Units: Independent ALU, multiplier/accumulator, and barrel shifter
• System Integration: Includes two data address generators, program sequencer, and programmable timer
• DMA Support: 16-bit internal DMA port for high-speed memory access
• Memory Interface: Supports up to 4MB external memory for data tables
• Package: 100-lead Thin Quad Flat Pack (TQFP)

Applications

The ADSP-2187L is designed for demanding signal processing applications across multiple industries:

• Audio Processing: Professional audio equipment, effects processors, and digital mixers
• Telecommunications: Modems, cellular base stations, and voice processing systems
• Industrial Control: Motor control, power monitoring, and instrumentation
• Medical Imaging: Ultrasound equipment and other diagnostic systems
• Military/Aerospace: Radar processing, secure communications, and avionics
• Consumer Electronics: Advanced audio/video equipment and gaming systems

Electrical Characteristics

The ADSP-2187L operates with the following key electrical parameters:

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +4.6V
• Input Voltage: -0.5V to VDD + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage: 3.3V ±5%
• Operating Temperature: Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
• Input High Voltage (VIH): 2.0V minimum
• Input Low Voltage (VIL): 0.8V maximum

Power Consumption

• Active Mode (52 MIPS): 300 mW typical
• Idle Mode: 100 mW typical
• Power-Down Mode: 50 μW typical

Timing Characteristics

• Instruction Cycle Time: 19 ns (52.6 MHz)
• Clock Input Frequency: 52.6 MHz maximum
• DMA Transfer Rate: Up to 52.6 Mbytes/second
• Reset Pulse Width: 10 clock cycles minimum

Package Information

The ADSP-2187L is available in a 100-lead Thin Quad Flat Pack (TQFP) package with the following specifications:

Mechanical Dimensions

• Package Type: 100-lead TQFP
• Body Size: 14mm × 14mm
• Lead Pitch: 0.5mm
• Package Height: 1.2mm maximum
• Lead Count: 100
• Lead Material: Copper alloy
• Lead Finish: Matte tin

Thermal Characteristics

• Thermal Resistance (θJA): 45°C/W
• Thermal Resistance (θJC): 15°C/W
• Maximum Junction Temperature: 125°C

Handling and Mounting

The TQFP package requires careful handling due to its fine pitch leads. Recommended mounting conditions include:

• Reflow soldering profile per JEDEC J-STD-020
• Maximum package body temperature during soldering: 220°C
• ESD protection required during handling (Class 1)
• Recommended storage conditions: <40°C, <90% relative humidity

Architectural Details

The ADSP-2187L features a modified Harvard architecture with three separate buses for simultaneous access to program memory and data memory:

Processor Core

• 16-bit fixed-point DSP architecture
• Single-cycle instruction execution
• Single-cycle context switching
• Multifunction instructions for parallel operations

Memory Organization

• 32K words (48-bit) program memory RAM
• 32K words (16-bit) data memory RAM
• Dual-purpose program memory for instruction and data storage
• 4MB external memory space accessible through memory interface

Computational Units

• Arithmetic Logic Unit (ALU): 16-bit with 40-bit accumulator
• Multiplier/Accumulator: 16×16-bit with 40-bit result
• Barrel Shifter: Supports arithmetic and logical shifts

Development Support

The ADSP-2187L is supported by comprehensive development tools:

• Analog Devices VisualDSP++ development environment
• C compiler and assembler
• Debugger with real-time emulation
• Evaluation boards and reference designs
• Extensive DSP library for common algorithms

Conclusion

The ADSP-2187L represents a powerful, integrated solution for digital signal processing applications requiring high performance in a low-power package. Its combination of computational power, large on-chip memory, and system integration features make it particularly suitable for embedded systems where space, power, and performance are critical factors. The processor's compatibility with the ADSP-2100 family ensures easy migration for existing designs while offering enhanced capabilities for new developments.

With its robust feature set and proven architecture, the ADSP-2187L continues to be a preferred choice for designers implementing demanding DSP applications across multiple industries.