Analog Devices Inc. ADSP-2171BSZ-133

Overview

ADSP-2171BSZ-133 from Analog Devices is a 5 V, 33 MIPS fixed-point DSP microcomputer with three parallel computational units (ALU, MAC, shifter), 2K × 24-bit on-chip program RAM, 2K × 16-bit data RAM, dual synchronous serial ports (SPORT0/SPORT1), and an 8-/16-bit host interface port (HIP). It executes every instruction in a single 30 ns cycle and supports zero-overhead looping for real-time audio and telecom signal processing.

For engineers reviewing the ADSP-2171BSZ-133 datasheet, ADSP-2171BSZ-133 pinout, ADSP-2171BSZ-133 application, or ADSP-2171BSZ-133 equivalent, key selection criteria include its 30 ns instruction cycle time, 128-pin TQFP package, 5 V operation, powerdown mode (<0.55 mW standby), and ADSP-2100 family code compatibility with enhanced bit manipulation and global interrupt masking.

Technical Context

The ADSP-2171BSZ-133 implements the ADSP-2100 base architecture with three independent computational units-ALU, multiplier/accumulator (MAC), and barrel shifter-each connected via the internal 16-bit R bus to enable operand forwarding in one cycle. Its program sequencer supports conditional jumps, subroutine calls, and zero-overhead loops using internal loop counters and stacks.

Two dedicated data address generators (DAG1/DAG2) manage simultaneous dual-operand fetches with modulo addressing for circular buffers, while five internal buses (PMA, PMD, DMA, DMD, R) decouple program/data memory access and enable concurrent instruction fetch and data move operations within a single cycle.

Key Specifications

Pinout & Package

ADSP-2171BSZ-133 is housed in a 128-lead thin quad flat package (TQFP) with 0.4 mm lead pitch, surface-mount compatible, and RoHS-compliant per Analog Devices' packaging specification for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2171BSZ-133, ADSP-2172BSZ-133 adds ROM for unattended boot but shares identical power, timing, and interface behavior; TMS320C549PGE offers higher speed but demands full hardware and software redesign due to voltage, pinout, and architectural divergence.

Availability

ADSP-2171BSZ-133 is available at Aetrix Electronics and suitable for voice codec interface, digital audio processing, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for ADSP-2171BSZ-133 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and DSP technologies for precision signal processing and conversion.

The ADSP-217x series was designed as a cost-optimized, single-chip DSP microcomputer targeting portable and embedded digital audio, telecom, and industrial control applications requiring deterministic real-time performance at 5 V.

FAQ

What is the maximum operating frequency and instruction throughput of the ADSP-2171BSZ-133?

The ADSP-2171BSZ-133 operates with a 30 ns instruction cycle time, corresponding to a 33.33 MHz instruction rate and 33 million instructions per second (MIPS) throughput. This is achieved using a 16.67 MHz crystal or TTL clock input, as the internal clock is derived at twice the input frequency. All instructions-including ALU, MAC, and shifter operations-execute in a single cycle, enabling deterministic real-time performance critical for audio and control applications. The ADSP-2171BSZ-133 does not support higher frequencies than specified in its datasheet.

Does the ADSP-2171BSZ-133 support 3.3 V operation?

No, the ADSP-2171BSZ-133 is rated exclusively for 5.0 V ±10% operation and is not compatible with 3.3 V supply rails. It belongs to the 5 V ADSP-2171/2172 family; the 3.3 V variant is the ADSP-2173. Attempting to power the ADSP-2171BSZ-133 at 3.3 V will result in functional failure or undefined behavior. Power supply design must adhere strictly to the 4.5 V to 5.5 V range specified in the datasheet.

How does the Host Interface Port (HIP) of the ADSP-2171BSZ-133 function in system integration?

The ADSP-2171BSZ-133 HIP functions as an asynchronous, memory-mapped parallel interface supporting 8- or 16-bit host communication. It uses configurable pins (HSIZE, BMODE, HMD0/1) to adapt to processors like the Motorola 68000 or Intel 80C51. Six HIP data registers (HDR5–0) and two status registers (HSR7–6) reside in internal data memory space, enabling mailbox-style bidirectional data exchange. The host can read/write these registers while the DSP runs at full speed, making the ADSP-2171BSZ-133 ideal for master-slave architectures requiring offload of signal processing tasks.

What are the power management capabilities of the ADSP-2171BSZ-133?

The ADSP-2171BSZ-133 supports three low-power modes: Powerdown (<0.55 mW standby), Idle, and Slow Idle. Powerdown halts the core clock and reduces current to sub-milliwatt levels with 100-cycle wake-up latency. Idle suspends execution until an interrupt occurs, while Slow Idle reduces internal clock frequency by factors of 16, 32, 64, or 128 to proportionally lower dynamic power. These features are controlled via the PWD pin or software bits and are validated for battery-operated portable equipment, distinguishing the ADSP-2171BSZ-133 from non-power-optimized DSPs.

Is the ADSP-2171BSZ-133 pin-compatible with other ADSP-217x variants?

Yes, the ADSP-2171BSZ-133 is pin-compatible with ADSP-2172BSZ-133 and ADSP-2173BSZ-133 in the same 128-pin TQFP package, sharing identical pin assignments, electrical characteristics, and mechanical footprint. However, functional differences exist: ADSP-2172 includes 8K × 24-bit ROM, and ADSP-2173 operates at 3.3 V. Swapping ADSP-2171BSZ-133 with ADSP-2172BSZ-133 requires no PCB changes but may need firmware updates to utilize ROM; substitution with ADSP-2173BSZ-133 requires full power rail redesign.