ADSP-21488KSWZ-4A ADI SHARC Floating-Point DSP 400MHz 1600MFLOPS 5Mb SRAM SPORT SPI LQFP-176

ADSP-21488KSWZ-4A  Product Overview

The ADSP-21488KSWZ-4A is a high-performance 32-bit floating-point SHARC digital signal processor from Analog Devices, supplied in an LQFP-176 package. Operating over the commercial temperature range of 0°C to +70°C, the ADSP-21488KSWZ-4A features a fourth-generation SHARC core running at 400 MHz, delivering up to 1600 MFLOPS peak floating-point performance for the most demanding audio algorithms, industrial control, medical imaging, and high-speed measurement tasks. The ADSP-21488KSWZ-4A integrates 5 Mbit of internal SRAM (3 Mbit program RAM + 2 Mbit data RAM) and provides an external memory interface supporting 16-bit SDRAM, asynchronous SRAM, and FLASH expansion for large programs and data buffers. Peripherals of the ADSP-21488KSWZ-4A include four SPORT serial interfaces (compatible with I2S, TDM, and other audio protocols), two SPI ports, a UART, 16 general-purpose I/O pins, and multiple timers. With ADI’s VisualDSP++ or CrossCore Embedded Studio development environment, engineers can quickly develop and debug algorithms on the ADSP-21488KSWZ-4A. The ADSP-21488KSWZ-4A is widely used in high-end professional audio effects, digital mixers, automotive audio DSP, instrumentation, and a variety of embedded signal processing systems requiring superior floating-point computation power.

ADSP-21488KSWZ-4A  Core Features

Processor Core: The ADSP-21488KSWZ-4A features a 4th-gen SHARC 32-bit floating-point DSP core running at 400 MHz (2.5 ns cycle)

Floating-Point Performance: The ADSP-21488KSWZ-4A delivers 1600 MFLOPS peak

Internal Memory: The ADSP-21488KSWZ-4A provides 5 Mbit SRAM (3 Mbit program RAM + 2 Mbit data RAM)

External Memory Interface: The ADSP-21488KSWZ-4A supports 16-bit SDRAM, async SRAM, and FLASH

Serial Peripherals: The ADSP-21488KSWZ-4A includes 4× SPORT (I2S/TDM capable) and 2× SPI

Other Peripherals: The ADSP-21488KSWZ-4A offers UART, 16 GPIOs, and timers

DMA Controller: The ADSP-21488KSWZ-4A features multi-channel DMA for efficient data transfer

Power Supply: The ADSP-21488KSWZ-4A operates with 1.2 V core / 3.3 V I/O

Package: The ADSP-21488KSWZ-4A comes in LQFP-176 (24×24 mm)

Temperature Range: The ADSP-21488KSWZ-4A covers 0°C to +70°C (commercial)

ADSP-21488KSWZ-4A  Applications

High-End Professional Audio: The ADSP-21488KSWZ-4A excels in digital reverbs, multi-band equalizers, dynamics processors, guitar effects, and digital mixers

Automotive Audio DSP: The ADSP-21488KSWZ-4A is ideal for active noise cancellation, multi-channel audio signal processing, and engine noise elimination

Industrial Instrumentation: The ADSP-21488KSWZ-4A supports real-time spectral analysis, vibration monitoring, harmonic measurement, and industrial control

Medical Equipment: The ADSP-21488KSWZ-4A is used in portable ultrasound and ECG/EEG signal processing front ends (indoor environments)

General Floating-Point DSP: The ADSP-21488KSWZ-4A suits control and data acquisition systems requiring ultra-high floating-point speed

ADSP-21488KSWZ-4A  Key Advantages

Superior Floating-Point Power: The ADSP-21488KSWZ-4A's 400 MHz SHARC core delivers 1600 MFLOPS for the most complex algorithms

Large On-Chip SRAM: The ADSP-21488KSWZ-4A's 5 Mbit internal memory reduces reliance on external memory, boosting system efficiency

Flexible External Memory: The ADSP-21488KSWZ-4A's SDRAM/FLASH interface suits large programs and data buffers

Audio-Optimized Interfaces: The ADSP-21488KSWZ-4A's 4 SPORTs with I2S/TDM directly connect to multiple ADCs/DACs/codecs

Rich Serial Peripherals: The ADSP-21488KSWZ-4A offers dual SPI + UART for easy connectivity to MCUs, wireless modules, or debug terminals

Easy Development: The ADSP-21488KSWZ-4A is supported by VisualDSP++/CrossCore Studio providing a complete toolchain and optimized libraries

Classic SHARC Family: The ADSP-21488KSWZ-4A is a mature 4th-gen architecture with proven global deployment and stable supply

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FAQ:

1. Why is the ADSP-21488KSWZ-4A widely chosen for high-end audio equipment, and how powerful is its floating-point capability?
   The ADSP-21488KSWZ-4A delivers a solid 800 MFLOPS peak performance at 400 MHz, executing one multiply-accumulate per cycle. This enables zero-latency, high-resolution real-time processing for complex FIR/IIR filters and FFT analysis, making the ADSP-21488KSWZ-4A a go-to device for digital mixers, high-end effects processors, and automotive amplifiers.

2. Is the on-chip 5 Mbit SRAM of the ADSP-21488KSWZ-4A partitioned into program and data memory? What does that mean for my design?
   Yes, the ADSP-21488KSWZ-4A's 5 Mbit is split into 3 Mbit of program RAM and 2 Mbit of data RAM. This Harvard-style architecture allows simultaneous instruction and data access, eliminating bandwidth conflicts that are critical for real-time audio and industrial control loops.

3. What if I need more than 5 Mbit of memory for the ADSP-21488KSWZ-4A? Can I connect external SDRAM?
   Absolutely. The ADSP-21488KSWZ-4A's external memory interface supports standard 16-bit SDRAM (e.g., PC133), asynchronous SRAM, and NOR Flash. For projects requiring large audio sample buffers or complex GUIs, adding a single SDRAM chip expands storage by several megabytes.

4. How many I2S audio channels can the four SPORTs on the ADSP-21488KSWZ-4A handle simultaneously? What about in TDM mode?
   In I2S mode, each SPORT on the ADSP-21488KSWZ-4A carries two channels (left/right), giving 8 channels total. By configuring each SPORT for TDM8 (8 slots), you can achieve up to 32 digital audio channels, easily supporting multi-channel home theater or professional recording setups.

5. Do I have to use the paid VisualDSP++ to develop for the ADSP-21488KSWZ-4A? Is there a free alternative?
   No, ADI has transitioned to the free CrossCore Embedded Studio (CCES). This Eclipse-based IDE includes a complete C/C++ compiler, debugger, and optimized DSP libraries, all available at no cost for the SHARC family, significantly lowering the evaluation and development barrier for the ADSP-21488KSWZ-4A.

6. What does the “KSWZ-4A” suffix in the part number of the ADSP-21488KSWZ-4A actually mean?
   “K” indicates the commercial temperature range (0°C–70°C) for the ADSP-21488KSWZ-4A, “S” denotes the LQFP package, “W” typically means RoHS compliant, “Z” is lead-free, and “-4A” specifically identifies the 400 MHz speed grade. Knowing this helps ensure you order the exact variant without accidentally mixing industrial or other package types.

7. Does the ADSP-21488KSWZ-4A have built-in flash for program storage? How does it boot?
   No, the ADSP-21488KSWZ-4A uses a classic ROM-less SHARC booting scheme. An external SPI flash memory is required, from which the DSP automatically loads the program into internal RAM at power-up. This allows you to flexibly choose the flash capacity based on your code size.

8. Compared to the similar ADSP-21489, what is the key advantage of the ADSP-21488KSWZ-4A?
   They share the same architecture, but the ADSP-21488KSWZ-4A is a fixed 400 MHz device, while the 21489 comes in both 350 MHz and 400 MHz grades. Choosing the ADSP-21488KSWZ-4A guarantees every chip operates at the top 400 MHz performance, simplifying supply chain management for designs that always need maximum throughput.

9. Can I build a digital effects pedal with an LCD screen using the ADSP-21488KSWZ-4A? How would I connect the display?
   Yes. You can dedicate one SPI port of the ADSP-21488KSWZ-4A to an SPI-based LCD or OLED for parameter display, and use another SPI or the UART for encoders and buttons. The ADSP-21488KSWZ-4A handles all audio computation, while an MCU can manage the UI, communicating via SPI/UART to build a complete stompbox or rack-mount processor.

10. Where can I find ready-made audio algorithms like reverb and EQ for the ADSP-21488KSWZ-4A?
    Analog Devices provides extensive free software packs and reference designs on their website, including various reverb models, parametric EQs, dynamic compressors, and crossover algorithms. Through SigmaStudio or CCES example projects, you get optimized assembly/C mixed code to quickly implement commercial-grade audio effects on the ADSP-21488KSWZ-4A.