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ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144
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ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144

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ADSP-21261SKSTZ150 Product Overview

The ADSP-21261SKSTZ150 is a high-performance 32-bit floating-point SHARC digital signal processor from Analog Devices, supplied in an LQFP-144 package. Based on the SHARC architecture and running at 150 MHz, the ADSP-21261SKSTZ150 delivers up to 900 MFLOPS peak floating-point performance, making it ideal for complex audio, industrial control, and measurement algorithms. The ADSP-21261SKSTZ150 integrates 2 Mbit of internal SRAM (1 Mbit program RAM + 1 Mbit data RAM) and features an external memory interface supporting asynchronous SRAM, SDRAM, and FLASH, enabling flexible expansion for large programs and data buffers. Peripheral options on the ADSP-21261SKSTZ150 include two SPI ports, four SPORT serial interfaces (supporting I2S, TDM, and other audio protocols), a UART, timers, and up to 12 general-purpose I/O pins. With ADI’s VisualDSP++ or CrossCore Embedded Studio development environment, engineers can quickly implement and debug algorithms on the ADSP-21261SKSTZ150. The ADSP-21261SKSTZ150 is widely used in professional audio effects, automotive audio DSP, instrumentation, vibration analysis, and a variety of embedded signal processing systems, thanks to its excellent floating-point performance, rich peripherals, and compact form factor.


ADSP-21261SKSTZ150 Core Features

Processor Core: The ADSP-21261SKSTZ150 features a SHARC 32-bit floating-point DSP core running at 150 MHz (6.67 ns instruction cycle)

Floating-Point Performance: The ADSP-21261SKSTZ150 delivers 900 MFLOPS peak

Internal Memory: The ADSP-21261SKSTZ150 provides 2 Mbit SRAM (1 Mbit program RAM + 1 Mbit data RAM)

External Memory Interface: The ADSP-21261SKSTZ150 supports async SRAM, SDRAM, and FLASH

Serial Peripherals: The ADSP-21261SKSTZ150 includes 2× SPI and 4× SPORT (I2S/TDM capable)

Other Peripherals: The ADSP-21261SKSTZ150 offers UART, timers, and 12 GPIOs

DMA Controller: The ADSP-21261SKSTZ150 features multi-channel DMA for efficient data transfer

Power Supply: The ADSP-21261SKSTZ150 operates with 1.2 V core / 3.3 V I/O

Package: The ADSP-21261SKSTZ150 comes in LQFP-144 (20×20 mm)

Temperature Range: The ADSP-21261SKSTZ150 covers -40°C to +85°C (industrial)


ADSP-21261SKSTZ150 Applications

Professional Audio Processing: The ADSP-21261SKSTZ150 excels in digital reverbs, multi-band equalizers, dynamics processors, and effects units

Automotive Audio DSP: The ADSP-21261SKSTZ150 is ideal for active noise cancellation, engine harmonic elimination, and multi-channel audio signal processing

Industrial Instrumentation: The ADSP-21261SKSTZ150 is used in vibration analysis, harmonic measurement, and real-time signal filtering

Medical Equipment: The ADSP-21261SKSTZ150 supports portable ultrasound and ECG signal processing front ends

General Embedded Signal Processing: The ADSP-21261SKSTZ150 suits control systems requiring high-speed floating-point computation


ADSP-21261SKSTZ150 Key Advantages

Strong Floating-Point Performance: The ADSP-21261SKSTZ150's 150 MHz SHARC core delivers 900 MFLOPS for complex floating-point algorithms

Flexible External Memory: The ADSP-21261SKSTZ150's SDRAM/FLASH support adapts to large program and data requirements

Audio-Friendly Interfaces: The ADSP-21261SKSTZ150's 4 SPORTs with I2S/TDM directly connect to ADCs, DACs, and codecs

Dual SPI & UART: The ADSP-21261SKSTZ150 offers easy connectivity to MCUs, wireless modules, or debug terminals

Industrial Temperature Range: The ADSP-21261SKSTZ150 operates from -40°C to +85°C, ensuring reliability in harsh environments

Easy Development: The ADSP-21261SKSTZ150 is supported by VisualDSP++/CrossCore Studio, providing complete compilation and debugging support

Classic SHARC Family: The ADSP-21261SKSTZ150 is a mature, stable architecture with proven global deployment and stable supply


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ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS 2Mb SRAM SPI SPORT LQFP-144 ADSP-21261SKSTZ150 ADI SHARC Floating-Point DSP 150MHz 900MFLOPS SPI SPORT LQFP-144




FAQ:

  1. What can 300 MFLOPS actually achieve with the ADSP-21261SKSTZ150? Is it enough for a stompbox?
    The ADSP-21261SKSTZ150's 300 MFLOPS (at 150MHz) can run a complete guitar effects chain—overdrive/distortion, 4-band parametric EQ, stereo chorus, and spring reverb—while handling 48 kHz stereo I2S audio streams. It is perfectly adequate for most stompboxes, small mixers, or two-channel audio processors.

  2. With only 2 Mbit of internal SRAM on the ADSP-21261SKSTZ150, can I fit both code and delay lines on-chip?
    The 2 Mbit on the ADSP-21261SKSTZ150 is split into 1 Mbit program RAM (approx. 4K instructions) and 1 Mbit data RAM (approx. 32K 32-bit float samples). Small-to-medium FIR, EQ, and short reverb can reside entirely on-chip for the ADSP-21261SKSTZ150. For longer delays or larger programs, external SDRAM and flash can be added.

  3. How many codecs can the SPORTs on the ADSP-21261SKSTZ150 connect to? Do they support TDM?
    Each of the four SPORTs on the ADSP-21261SKSTZ150 can be independently configured for I2S or TDM. In I2S mode, they support up to four stereo codecs (8 channels). In TDM8 mode, the system can scale to 32 audio channels, suitable for multi-track recording or surround sound.

  4. I used the ADSP-21065L before. How much effort is needed to migrate to the ADSP-21261SKSTZ150?
    The ADSP-21261SKSTZ150 is largely code-compatible with earlier SHARC devices. Migration typically involves recompiling in CCES and adjusting the linker script for the new memory map. Core algorithms require minimal changes, while you can optionally upgrade to use the richer peripherals like SPI and UART on the ADSP-21261SKSTZ150.

  5. Is the LQFP-144 package of the ADSP-21261SKSTZ150 easy to solder? Is it suitable for DIY?
    Yes. With 0.5 mm pin pitch, the ADSP-21261SKSTZ150 can be drag-soldered by hand using a soldering iron and flux—no hot-air station needed. This makes the ADSP-21261SKSTZ150 very DIY-friendly and easier to debug than BGA packages.

  6. I want to build an EQ with an LCD display. Can the ADSP-21261SKSTZ150 handle audio processing and drive a screen?
    Yes. Dedicate one SPI port of the ADSP-21261SKSTZ150 to an SPI LCD or OLED, and another SPI or UART to encoders and buttons. The ADSP-21261SKSTZ150 focuses on audio, while DMA refreshes the display in the background with minimal real-time impact, enabling a fully interactive effects unit.

  7. What is the typical power consumption of the ADSP-21261SKSTZ150? How long would it run on a 9V battery?
    Typical power for the ADSP-21261SKSTZ150 is around 0.4–0.6 W. With a 9V alkaline battery (≈500 mAh) and efficient DC/DC conversion, it can run for roughly 3–5 hours. Lithium batteries are recommended for longer portable operation.

  8. Can I use the newer CrossCore Embedded Studio (CCES) instead of the old VisualDSP++ for the ADSP-21261SKSTZ150?
    Absolutely. CCES fully supports 1st-gen SHARC devices including the ADSP-21261SKSTZ150. It is free, Eclipse-based, and offers modern debugging and analysis features, making it the recommended tool for new projects.

  9. How can I store user presets on the ADSP-21261SKSTZ150 for an effects pedal?
    You can connect a small serial EEPROM or Data Flash via one of the SPI ports on the ADSP-21261SKSTZ150. The DSP reads EQ settings and effect selections from the external memory at boot, restoring the last-used configuration.

  10. Are there ready-made audio algorithm examples available for the ADSP-21261SKSTZ150, like reverb, chorus, and delay?
    Yes, ADI provides extensive audio algorithm libraries for the SHARC family, including reference implementations of many classic effects for the ADSP-21261SKSTZ150. These libraries come with source code and can be compiled and tested in CCES on evaluation boards, helping you quickly assemble your own effect chains.

Property:
Specification
Product Type:
SHARC 32-bit Floating-Point DSP
Brand:
Analog Devices
Processor Core:
SHARC, 150 MHz (6.67 ns cycle)
Floating-Point Performance:
900 MFLOPS peak
Internal SRAM:
2 Mbit (1 Mbit program + 1 Mbit data)
External Memory Interface:
Supports async SRAM/SDRAM/FLASH
Serial Interfaces:
2× SPI, 4× SPORT (I2S/TDM)
Package:
LQFP-144 (20×20 mm)
Temperature:
-40°C to +85°C
Power Supply:
1.2 V core / 3.3 V I/O
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