ADSP-2105BPZ-80

Digital Signal Processor Dsp Overview

The ADSP-2105BPZ-80 is a 16-bit fixed-point digital signal processor from the Analog Devices ADSP-2100 family, fabricated in submicron CMOS. It operates at a maximum clock frequency of 20 MHz with a 50 ns instruction cycle time, delivering 20 MIPS performance. The device features an enhanced Harvard architecture with three independent buses for simultaneous instruction fetch and dual data operand access. Key internal resources include 1K words of on-chip program RAM and 512 words of data RAM. It integrates one synchronous serial port (SPORT1), a programmable interval timer, and supports zero-overhead looping for efficient code execution.

Digital Signal Processor Dsp Feature Summary

• Enhanced Harvard Architecture: Three-bus system allows single-cycle execution of instructions, data moves, and computations via separate Program Memory Address, Program Memory Data, Data Memory Address, and Data Memory Data buses.
• Integrated Peripherals: Includes one double-buffered Serial Port (SPORT1) with hardware companding support and a programmable interval timer generating periodic interrupts.
• Memory Configuration: Contains 1K words of on-chip SRAM for program storage and 512 words of on-chip SRAM for data storage, supporting automatic booting from external byte-wide memory.
• Processing Units: Features independent Arithmetic Logic Unit (ALU), Multiplier/Accumulator (MAC), and Shifter units capable of multiprecision operations within a single cycle.

Digital Signal Processor Dsp Applications

• Digital signal processing applications requiring low-cost 16-bit fixed-point computation
• Systems utilizing synchronous serial communication interfaces with SPORT1
• Embedded control loops leveraging zero-overhead hardware looping capabilities

Digital Signal Processor Dsp Procurement Notes

Verify the specific suffix 'BPZ-80' against current manufacturer documentation to confirm package type, temperature grade, and speed bin. The 'B' indicates industrial temperature range (-40°C to +85°C). Confirm availability status as older ADSP-21xx variants may be obsolete or require alternative sourcing strategies.

Digital Signal Processor Dsp Selection Notes

Select this component when a 20 MHz 16-bit DSP with minimal on-chip memory (1K Program/512 Data) is required. Ensure the application fits within the 15K word external address space limit. Verify that the single SPORT1 interface meets I/O requirements, as SPORT0 is absent on the ADSP-2105 compared to other family members like the ADSP-2101.

Digital Signal Processor Dsp Part Context

This part belongs to the ADSP-2100 Family, which shares a common core architecture including the ALU, MAC, shifter, and two Data Address Generators (DAGs). The ADSP-2105 is positioned as a low-cost variant within this family, distinguished by its reduced memory size and single serial port configuration compared to the ADSP-2101 or ADSP-2115.

Digital Signal Processor Dsp Replacement Considerations

Direct pin-compatible replacements within the same package are limited due to the obsolete status of many ADSP-21xx parts. Consider the ADSP-2101 or ADSP-2115 if additional memory or a second serial port is needed, though these may require schematic adjustments for unused pins or different interrupt mappings.

Digital Signal Processor Dsp FAQ

Does the ADSP-2105 support multichannel operation?

No, the ADSP-2105 only includes Serial Port 1 (SPORT1). Multichannel capability is exclusive to SPORT0, which is not present on the ADSP-2105.

What is the maximum instruction execution rate?

The ADSP-2105 executes every instruction in a single cycle. At its maximum clock frequency of 20 MHz, it achieves a throughput of 20 MIPS (Million Instructions Per Second).

How does the ADSP-2105 handle external memory interfacing?

It supports external program and data memory expansion up to 15K words each. Programmable wait-state generation allows interfacing with slower external memories, and it supports automatic booting from byte-wide external EPROM.