ADSP-2186L Digital Signal Processor

Overview

The ADSP-2186L is a high-performance, single-chip microcomputer optimized for digital signal processing (DSP) and other high-speed numeric processing applications. As part of the ADSP-2100 family, it offers enhanced computational capabilities, efficient memory utilization, and flexible system interfacing. With a 30 ns instruction cycle time and 33 MIPS sustained performance, the ADSP-2186L is designed for demanding real-time signal processing tasks.

Key Features

Performance

• 30 ns instruction cycle time at 33 MIPS sustained performance
• Single-cycle instruction execution and context switching
• 3-bus architecture enables dual operand fetches in every instruction cycle
• Multifunction instructions for efficient programming
• Power-down mode with low CMOS standby power dissipation (400 cycle recovery)
• Low power dissipation in idle mode

Integration

• ADSP-2100 family code compatible with instruction set extensions
• 40K bytes of on-chip RAM (8K words program memory, 8K words data memory)
• Dual-purpose program memory for both instruction and data storage
• Independent computational units: ALU, multiplier/accumulator, and barrel shifter
• Two independent data address generators
• Powerful program sequencer with zero-overhead looping
• Conditional instruction execution capability
• Programmable 16-bit interval timer with prescaler

System Interface

• 16-bit internal DMA port for high-speed on-chip memory access
• 4 MByte byte memory interface for data tables and program overlays
• 8-bit DMA to byte memory for transparent program/data transfers
• I/O memory interface with 2048 locations supporting parallel peripherals
• Programmable memory strobes and separate I/O memory space
• Programmable wait state generation
• Two double-buffered serial ports with companding hardware
• Automatic booting from byte-wide external memory
• Six external interrupts
• 13 programmable flag pins for system signaling
• UART emulation capability through software
• ICE-Port™ emulator interface for system debugging

Applications

The ADSP-2186L is suitable for a wide range of digital signal processing applications including:

• Audio processing and effects
• Speech recognition and synthesis
• Telecommunications systems
• Modems and data communication equipment
• Industrial control systems
• Medical instrumentation
• Radar and sonar processing
• Image processing systems
• Motor control applications

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: 3.0V to 3.6V
• Operating temperature: -40°C to +85°C
• Input high voltage: 2.0V min (VDD = 3.0V)
• Input low voltage: 0.8V max (VDD = 3.0V)

Power Consumption

• Active mode (33 MIPS): 300 mW typical
• Idle mode: 100 mW typical
• Power-down mode: 50 μW typical

Package Information

100-Lead TQFP (Thin Quad Flat Pack)

• Package dimensions: 14mm x 14mm body
• Lead pitch: 0.5mm
• Lead count: 100
• Package height: 1.2mm max
• Moisture sensitivity level (MSL): 3

Pin Configuration

The 100-lead TQFP package organizes pins into functional groups including:

• Power and ground pins
• Clock and reset pins
• Data and address bus pins
• Memory interface pins
• Serial port pins
• Flag and interrupt pins
• DMA and emulation pins

Design Considerations

Power Supply Decoupling

Proper power supply decoupling is critical for optimal performance. Place 0.1 μF ceramic capacitors close to each VDD pin and use bulk capacitors (10 μF) distributed across the board.

Clock Circuitry

The ADSP-2186L requires a clean clock source. Crystal oscillators or external clock drivers should be placed close to the processor with proper termination to minimize jitter and noise.

Thermal Management

While the TQFP package has moderate thermal performance, applications running at maximum speed may require thermal vias or additional cooling measures in high-temperature environments.

Development Support

Analog Devices provides comprehensive development support for the ADSP-2186L including:

• VisualDSP++ integrated development environment
• Emulators and evaluation boards
• Application notes and reference designs
• DSP libraries and algorithm implementations
• Technical documentation and user manuals

Conclusion

The ADSP-2186L represents a powerful, integrated solution for digital signal processing applications requiring high performance in a compact package. Its combination of computational power, on-chip memory, and flexible I/O capabilities make it suitable for a wide range of embedded DSP applications. The device's low power modes and efficient architecture extend its usefulness to portable and power-sensitive applications while maintaining the performance needed for real-time signal processing tasks.