Analog Devices Inc. ADSP-2171BS-104

Overview

ADSP-2171BS-104 from Analog Devices is a 32-bit fixed-point DSP microcomputer optimized for real-time digital signal processing in embedded audio, telecom, and industrial control systems. It delivers 33 MIPS at 30 ns instruction cycle time (16.67 MHz crystal, 5.0 V), integrates 2K × 24-bit program RAM, 2K × 16-bit data RAM, dual serial ports with hardware companding, and an 8/16-bit host interface port.

For engineers reviewing the ADSP-2171BS-104 datasheet, ADSP-2171BS-104 pinout, ADSP-2171BS-104 application, or ADSP-2171BS-104 equivalent, key selection criteria include single-cycle instruction execution, zero-overhead looping, bus grant hang logic for multi-processor coexistence, powerdown mode with <0.55 mW standby, and full ADSP-2100 family code compatibility with enhanced bit manipulation and biased rounding instructions.

Technical Context

The ADSP-2171BS-104 implements the ADSP-2100 base architecture with three parallel computational units (ALU, MAC, shifter), two dedicated data address generators (DAGs), and a programmable timer. Its memory subsystem supports simultaneous dual-operand fetches-one from on-chip program RAM and one from on-chip data RAM-enabling true single-cycle dual-move + compute operations.

It features two double-buffered synchronous serial ports (SPORT0/SPORT1) supporting 3–16-bit word lengths, A-law/µ-law companding per CCITT G.711, and independent framing; plus a fully asynchronous 8/16-bit host interface port (HIP) with six memory-mapped data registers and dual interrupt sources (HIP read/write), configurable via HSIZE, BMODE, and HMD pins.

Key Specifications

Pinout & Package

ADSP-2171BS-104 is housed in a 128-pin TQFP (Thin Quad Flat Package) with 0.4 mm pitch, thermally enhanced for sustained DSP workloads in compact industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2171BS-104, ADSP-2172KS-104 adds non-volatile program storage but shares identical real-time performance and peripheral integration, whereas TMS320C549PGE trades ease of host interfacing and low-power features for raw throughput - making ADSP-2171BS-104 optimal for cost-sensitive, battery-aware, host-coordinated DSP edge nodes.

Availability

ADSP-2171BS-104 is available at Aetrix Electronics and suitable for voice band modems, digital audio effects processors, industrial motor controllers, and portable medical ultrasound systems requiring stable component supply and long-term obsolescence management.

Supply support for ADSP-2171BS-104 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 leader specializing in high-performance analog, mixed-signal, and DSP technologies for precision signal processing applications.

The ADSP-217x product line was designed to deliver single-chip, low-power, code-compatible evolution of the ADSP-2100 architecture for embedded real-time DSP in portable and cost-constrained systems.

FAQ

What is the maximum operating frequency and voltage specification for the ADSP-2171BS-104?

The ADSP-2171BS-104 operates at a 30 ns instruction cycle time, corresponding to 33 MIPS, when powered at 5.0 V with a 16.67 MHz crystal. It is rated exclusively for 5.0 V operation - unlike the ADSP-2173 variant, which supports 3.3 V. The device requires stable 5.0 V ±5% supply and does not support mixed-voltage I/O or dynamic voltage scaling.

Does the ADSP-2171BS-104 include on-chip program ROM, or is external boot memory required?

The ADSP-2171BS-104 contains 2K × 24-bit on-chip program RAM but no embedded program ROM. External byte-wide boot memory (e.g., 27C256 EPROM) is required unless booting via the host interface port (HIP). Boot mode is selected by the BMODE pin: logic 0 enables EPROM boot, logic 1 selects HIP-initiated loading - allowing flexible firmware deployment in production and service environments.

How does the Bus Grant Hang Logic (BGH) function in the ADSP-2171BS-104, and why is it important?

The BGH output in the ADSP-2171BS-104 signals when the processor has granted external bus control but has not yet completed its internal bus release sequence. This prevents deadlock in multi-processor systems where another master attempts to seize the bus before ADSP-2171BS-104 fully relinquishes it. BGH is essential for robust shared-bus architectures such as dual-DSP audio engines or host-DSP coprocessor configurations.

Can the ADSP-2171BS-104 execute code directly from external memory, or is on-chip RAM mandatory for operation?

The ADSP-2171BS-104 requires on-chip program RAM to execute instructions - it cannot fetch and execute code directly from external memory in normal operation. However, external memory may be used for data storage or boot code loading. After reset, the ADSP-2171BS-104 automatically loads program code from external EPROM or HIP into its 2K × 24-bit internal program RAM, then begins execution from address 0x0000 in that RAM.

What are the power consumption characteristics of the ADSP-2171BS-104 in active and standby modes?

In active operation at 5.0 V and 30 ns cycle time, the ADSP-2171BS-104 dissipates 300 mW typical. In powerdown mode, it draws less than 0.55 mW (sub-100 µA), with full context retention and 100 CLKIN-cycle wake-up latency. Idle and Slow Idle modes offer intermediate savings: standard IDLE reduces current while awaiting interrupt, and IDLE(n) further scales internal clocks by factors of 16/32/64/128 for deeper savings in burst-processing applications.