Analog Devices Inc. ADSP-21371KSWZ-2B

Overview

ADSP-21371KSWZ-2B from Analog Devices is a 32-bit/40-bit floating-point SHARC® DSP optimized for high-performance automotive and professional audio processing, featuring a 266 MHz core (3.75 ns instruction cycle), 1 Mbit on-chip SRAM, 4 Mbit mask-programmable ROM, and integrated S/PDIF transceiver with eight dual-data-line serial ports operating up to 33 Mbps per line.

For engineers reviewing the ADSP-21371KSWZ-2B datasheet, ADSP-21371KSWZ-2B pinout, ADSP-21371KSWZ-2B application, or ADSP-21371KSWZ-2B equivalent, key selection considerations include SIMD computational throughput (1.596 GFLOPS at 266 MHz), ROM-based security with 64-bit JTAG key enforcement, and audio-centric peripheral integration including DAI routing, PCG, and 16 PWM outputs grouped in four banks.

Technical Context

The ADSP-21371KSWZ-2B implements a dual-processing-element SIMD architecture (PEX and PEY), each with independent ALU, multiplier, shifter, and 40-bit register file, enabling parallel execution of identical instructions on distinct data streams. Its enhanced Harvard architecture supports simultaneous single-cycle fetch of one 48-bit instruction and four 32-bit operands via dedicated PM and DM buses.

Peripherals are partitioned into two clock domains: the core domain hosts memory-mapped registers, SRAM/ROM, and JTAG; the I/O processor domain includes the Digital Applications Interface (DAI) with S/PDIF Tx/Rx, eight SPORTs, four PCGs, IDP, and DPI peripherals such as SPI, TWI, UART, and PWM - all routed through configurable signal routing units (DAI SRU/DPI SRU).

Key Specifications

Pinout & Package

ADSP-21371KSWZ-2B is housed in a thermally enhanced 208-lead LQFP_EP package (28 mm × 28 mm, 0.5 mm pitch) with exposed thermal pad for automotive-grade thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance audio DSP applications.

Compared with ADSP-21371KSWZ-2B, ADSP-21375KSWZ-2B sacrifices audio I/O density and security for lower cost, while ADSP-21479KSWZ-4 adds safety features and raw performance at higher power and complexity - making ADSP-21371KSWZ-2B the optimal balance for production automotive audio systems requiring S/PDIF, PWM, and ROM security without over-engineering.

Availability

ADSP-21371KSWZ-2B is available at Aetrix Electronics and suitable for automotive infotainment, professional audio equipment, and industrial signal analyzers requiring stable component supply, long-term lifecycle support, and AEC-Q100 Grade 2 qualification.

Supply support for ADSP-21371KSWZ-2B 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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.

The ADSP-21371KSWZ-2B belongs to the SHARC® family of SIMD DSPs engineered specifically for deterministic, low-latency audio signal processing in automotive and pro-audio systems - emphasizing on-chip memory bandwidth, audio-optimized peripherals, and hardware security.

FAQ

What is the maximum SDRAM bandwidth supported by the ADSP-21371KSWZ-2B?

The ADSP-21371KSWZ-2B supports 532 MB/s SDRAM throughput via its 32-bit external port operating at 133 MHz. This is achieved using the integrated SDRAM controller with programmable timing parameters, enabling direct interface to industry-standard SDRAM devices or DIMMs across four independently selectable banks (MS0–MS3) with contiguous addressing.

Does the ADSP-21371KSWZ-2B support booting from external memory?

Yes, the ADSP-21371KSWZ-2B can execute code directly from external memory bank 0 (SRAM or SDRAM) over the 48-bit external port data bus (EPD). However, when ROM-based security is enabled, booting exclusively from internal mask-ROM is enforced, and external boot modes are disabled until the correct 64-bit JTAG key is scanned.

How many independent clock domains does the ADSP-21371KSWZ-2B have, and what do they control?

The ADSP-21371KSWZ-2B has two independent clock domains: the core domain (driven by the PLL output) governs the SIMD processor, memory buses (PM/DM), and JTAG; the peripheral domain (PCLK) controls the DAI, DPI, SDRAM controller, and external port timing. This separation allows asynchronous operation - e.g., running SDRAM at 133 MHz while the core executes at 266 MHz.

Can the 16 PWM outputs on the ADSP-21371KSWZ-2B be configured for three-phase motor control?

Yes, the ADSP-21371KSWZ-2B's PWM module supports three-phase motor control via double-update mode in center-aligned configuration, which enables asymmetrical duty cycles mid-period to reduce harmonic distortion in inverters. All 16 outputs are grouped into four banks of four, allowing full three-phase bridge control with dead-time insertion and complementary pair generation.

Is the ADSP-21371KSWZ-2B pin-compatible with other SHARC processors like the ADSP-21369?

No, the ADSP-21371KSWZ-2B is not pin-compatible with the ADSP-21369 due to differences in package (208-lead LQFP_EP vs. 144-lead LQFP), peripheral pin allocation (e.g., dedicated DAI_P1–P20 vs. multiplexed GPIO), and external port bus width (32-bit vs. 16-bit). While source-code compatible, hardware redesign is required for migration.