Analog Devices Inc. ADSP-2105BP-55REEL

Overview

ADSP-2105BP-55REEL from Analog Devices is a 16-bit fixed-point DSP microprocessor with 1K × 16-bit on-chip data RAM, 1K × 16-bit on-chip program RAM, and a 20 MHz (50 ns) instruction cycle time. It implements an enhanced Harvard architecture with independent ALU, MAC, and shifter units, supports zero-overhead looping, and features one double-buffered serial port (SPORT1) for synchronous audio/data streaming in embedded signal processing systems.

For engineers reviewing the ADSP-2105BP-55REEL datasheet, ADSP-2105BP-55REEL pinout, ADSP-2105BP-55REEL application, or ADSP-2105BP-55REEL equivalent, key selection considerations include its 50 ns instruction cycle, single serial port configuration, absence of host interface port, 68-lead PLCC package, and industrial temperature range (–40°C to +85°C) compliance.

Technical Context

The ADSP-2105BP-55REEL executes all instructions in a single cycle using three internal buses: Program Memory Address (PMA), Data Memory Address (DMA), and Result (R) bus. Its dual data address generators support modulo and bit-reverse addressing for circular buffer management in FFT and filtering routines.

It lacks SPORT0 and host interface port-distinguishing it from ADSP-2111/2115-and relies solely on SPORT1 for serial I/O. Booting is supported from byte-wide external EPROM via automatic three-wait-state generation after reset.

Key Specifications

Pinout & Package

ADSP-2105BP-55REEL is housed in a 68-lead plastic leaded chip carrier (PLCC) package with 0.050" lead pitch and JEDEC-standard footprint. Pinout conforms to ADSP-2101/2103/2105/2115 family layout per Analog Devices datasheet Rev. C, page 52.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DSP microprocessor applications.

Compared with ADSP-2101KP-55, ADSP-2105BP-55REEL reduces BOM count by omitting SPORT0 yet retains full SPORT1 functionality for point-to-point audio links; versus ADSP-2105KP-55, it guarantees operation across extended industrial thermal cycles without derating.

Availability

ADSP-2105BP-55REEL is available at Aetrix Electronics and suitable for industrial motor control, voice codec subsystems, sensor signal conditioning, and legacy protocol bridging requiring stable component supply over extended product lifecycles.

Supply support for ADSP-2105BP-55REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial systems.

The ADSP-2100 Family-including ADSP-2105BP-55REEL-is designed for cost-sensitive, real-time embedded DSP applications where deterministic low-latency execution, on-chip memory integration, and serial I/O efficiency outweigh need for host interfaces or multichannel expansion.

FAQ

What is the maximum clock frequency supported by ADSP-2105BP-55REEL?

The ADSP-2105BP-55REEL operates at a maximum instruction rate of 20 MHz, corresponding to a 50 ns instruction cycle time. This speed grade is confirmed in Table I of the ADSP-2100 Family datasheet (Rev. C, p.3), where ADSP-2105 is explicitly rated for 20.0 MHz (50 ns). Exceeding this frequency violates AC timing specifications and may cause instruction fetch failures or data corruption in the on-chip RAM.

Does ADSP-2105BP-55REEL include a host interface port (HIP)?

No, ADSP-2105BP-55REEL does not include a host interface port. The HIP is exclusive to the ADSP-2111 variant, as stated in the "SUMMARY" section and Table I (p.3) of the datasheet. ADSP-2105BP-55REEL provides only SPORT1 for serial communication and three interrupt inputs (IRQ2, IRQ1, IRQ0), with no parallel host bus capability.

What memory configuration does ADSP-2105BP-55REEL provide on-chip?

ADSP-2105BP-55REEL integrates 1K × 16-bit (2 KB) of on-chip data RAM and 1K × 16-bit (2 KB) of on-chip program RAM. This configuration is documented in Table I (p.3) and confirmed in the "GENERAL DESCRIPTION" (p.1), distinguishing it from ADSP-2101 (2K program RAM) and ADSP-2115 (1K program RAM but 80-pin TQFP package).

Which serial port(s) are available on ADSP-2105BP-55REEL?

ADSP-2105BP-55REEL includes only SPORT1 - a double-buffered synchronous serial port. SPORT0 is omitted, as noted in the "Serial Ports" section (p.5) and Table I (p.3), which states "–" under SPORT0 for ADSP-2105. This limits multichannel TDM support but retains full-duplex framing, companding, and autobuffering on SPORT1.

What package type and lead count does ADSP-2105BP-55REEL use?

ADSP-2105BP-55REEL uses a 68-lead plastic leaded chip carrier (PLCC) package, as specified in the "PIN CONFIGURATIONS" section (p.52) and Table I (p.3). The "REEL" suffix indicates tape-and-reel packaging for automated SMT assembly, and the "BP" denotes the industrial temperature grade (–40°C to +85°C) in PLCC form.