Item specifics
Description
ADSP-21375KSWZ-2B Product Overview
The ADSP-21375KSWZ-2B is a high-performance 32-bit floating-point SHARC digital signal processor from Analog Devices, supplied in an LQFP-144 package. Operating over the commercial temperature range of 0°C to +70°C, the ADSP-21375KSWZ-2B features a second-generation SHARC core running at 200 MHz, delivering up to 1200 MFLOPS peak floating-point performance for demanding audio algorithms, industrial control, and high-speed measurement tasks. The ADSP-21375KSWZ-2B integrates 4 Mbit of internal SRAM (2 Mbit program RAM + 2 Mbit data RAM) and provides an external memory interface supporting asynchronous SRAM, SDRAM, and FLASH for large programs and data buffers. Peripherals of the ADSP-21375KSWZ-2B include two SPI ports, four SPORT serial interfaces (compatible with I2S, TDM, and other audio protocols), a UART, timers, and general-purpose I/O, enabling direct connections to ADCs, DACs, codecs, and external controllers. With ADI’s VisualDSP++ or CrossCore Embedded Studio development environment, engineers can quickly develop and debug algorithms on the ADSP-21375KSWZ-2B. The ADSP-21375KSWZ-2B is widely used in professional audio effects, high-end consumer audio, instrumentation, medical devices, and a variety of embedded floating-point signal processing systems.
ADSP-21375KSWZ-2B Core Features
Processor Core: The ADSP-21375KSWZ-2B features a 2nd-gen SHARC 32-bit floating-point DSP core running at 200 MHz (5 ns cycle)
Floating-Point Performance: The ADSP-21375KSWZ-2B delivers 1200 MFLOPS peak
Internal Memory: The ADSP-21375KSWZ-2B provides 4 Mbit SRAM (2 Mbit program RAM + 2 Mbit data RAM)
External Memory Interface: The ADSP-21375KSWZ-2B supports async SRAM, SDRAM, and FLASH
Serial Peripherals: The ADSP-21375KSWZ-2B includes 2× SPI and 4× SPORT (I2S/TDM capable)
Other Peripherals: The ADSP-21375KSWZ-2B offers UART, timers, and GPIOs
DMA Controller: The ADSP-21375KSWZ-2B features multi-channel DMA for efficient data transfer
Power Supply: The ADSP-21375KSWZ-2B operates with 1.2 V core / 3.3 V I/O
Package: The ADSP-21375KSWZ-2B comes in LQFP-144 (20×20 mm)
Temperature Range: The ADSP-21375KSWZ-2B covers 0°C to +70°C (commercial)
ADSP-21375KSWZ-2B Applications
Professional Audio Processing: The ADSP-21375KSWZ-2B excels in digital reverbs, multi-band equalizers, dynamics processors, and guitar effects
High-End Consumer Audio: The ADSP-21375KSWZ-2B is ideal for digital crossovers, room correction, and immersive audio rendering
Instrumentation: The ADSP-21375KSWZ-2B supports real-time spectral analysis, vibration monitoring, and harmonic measurement
Medical Equipment: The ADSP-21375KSWZ-2B is used in portable ultrasound and ECG signal processing front ends (indoor environments)
General Floating-Point DSP: The ADSP-21375KSWZ-2B suits control and data acquisition systems requiring high-speed floating-point computation
ADSP-21375KSWZ-2B Key Advantages
Powerful Floating-Point Performance: The ADSP-21375KSWZ-2B's 200 MHz SHARC core delivers 1200 MFLOPS for complex algorithms
Flexible External Memory: The ADSP-21375KSWZ-2B's SDRAM/FLASH interface suits large programs and data buffers
Audio-Friendly Interfaces: The ADSP-21375KSWZ-2B's 4 SPORTs with I2S/TDM directly connect to multiple ADCs/DACs
Dual SPI & UART: The ADSP-21375KSWZ-2B offers easy connectivity to MCUs, wireless modules, or debug terminals
4 Mbit On-Chip SRAM: The ADSP-21375KSWZ-2B's generous internal memory reduces external memory requirements
Easy Development: The ADSP-21375KSWZ-2B is supported by VisualDSP++/CrossCore Studio providing a complete toolchain
Classic SHARC Family: The ADSP-21375KSWZ-2B is a mature, stable architecture widely deployed in floating-point DSP applications
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FAQ:
Which SHARC generation is the ADSP-21375KSWZ-2B, and what performance level does 400 MFLOPS represent?
The ADSP-21375KSWZ-2B uses the mature 2nd-generation SHARC core, delivering 400 MFLOPS peak at 200 MHz. While not as fast as later SIMD-enhanced devices, the ADSP-21375KSWZ-2B provides reliable mid-range floating-point power perfectly suited for stompboxes, small mixers, and industrial analyzers, with excellent code compatibility across the SHARC family.
How is the internal 4 Mbit SRAM of the ADSP-21375KSWZ-2B organized, and how large a program can it hold?
The ADSP-21375KSWZ-2B's 4 Mbit is partitioned into 2 Mbit program RAM and 2 Mbit data RAM. This provides room for approximately 8K 32-bit instructions and 64K samples of 32-bit float data on the ADSP-21375KSWZ-2B—plenty for a complete guitar effects chain or medium-complexity FIR/IIR filters. External SDRAM and flash can be added for larger programs or extended delay buffers.
Do the SPORTs on the ADSP-21375KSWZ-2B support TDM8 mode? How many audio channels can I connect?
Yes. Each SPORT on the ADSP-21375KSWZ-2B can be configured for I2S or TDM. In I2S mode, the four SPORTs give you 8 audio channels. Switching all to TDM8 mode provides up to 32 digital audio channels, easily handling complex multi-channel systems.
I have an existing design using the ADSP-21261. Can I drop in the ADSP-21375KSWZ-2B as an upgrade?
They share the same SHARC instruction set. The ADSP-21375KSWZ-2B doubles the on-chip SRAM to 4 Mbit, so as long as your original code fits within the 21261's limits, you can simply re-target the device in CCES and recompile for the ADSP-21375KSWZ-2B. Verify external memory interface timings and SDRAM configuration—minor adjustments may be needed.
What are the advantages of the LQFP-144 package of the ADSP-21375KSWZ-2B? Is it hand-solderable?
The ADSP-21375KSWZ-2B's LQFP-144 has leads on all four sides with 0.5 mm pitch. It can be hand-soldered with a drag-soldering technique using a soldering iron and flux—no hot-air or reflow required. This makes the ADSP-21375KSWZ-2B very friendly for prototyping, small batch production, and repair, lowering the barrier compared to BGA packages.
Can the ADSP-21375KSWZ-2B handle Active Noise Cancellation (ANC)? What external components are needed?
Yes. A single-channel ANC system using the ADSP-21375KSWZ-2B typically requires two ADCs (reference and error microphones) and one DAC (speaker output), easily connected via two SPORTs. The adaptive filtering and LMS algorithms run comfortably in real time at 400 MFLOPS on the ADSP-21375KSWZ-2B. For multi-channel ANC, you can split processing across multiple chips or consider higher-performance SHARC variants.
What is the typical power consumption of the ADSP-21375KSWZ-2B? Is it suitable for battery-powered portable recorders?
At 200 MHz full load, typical power consumption of the ADSP-21375KSWZ-2B is around 0.6–0.9 W. With clock gating or idle/sleep modes, this can be reduced further for the ADSP-21375KSWZ-2B. Combined with efficient DC/DC converters, it is perfectly viable for battery-operated devices such as portable recorders or wireless instrument transmitters.
Can I use the latest CrossCore Embedded Studio (CCES) instead of the older VisualDSP++ for the ADSP-21375KSWZ-2B?
Yes, CCES fully supports 2nd-generation SHARC devices including the ADSP-21375KSWZ-2B. As a free Eclipse-based environment, it offers modern debugging, profiling, and code analysis features. Existing VisualDSP++ projects can be imported directly into CCES for continued development.
How can I build a USB audio effects pedal using the ADSP-21375KSWZ-2B? How do I add USB connectivity?
The ADSP-21375KSWZ-2B has no native USB controller, but you can connect an external USB audio bridge chip (e.g., XMOS, C-Media, or a dedicated USB-I2S IC) via SPI. The ADSP-21375KSWZ-2B handles all audio algorithms and communicates with ADCs/DACs through SPORTs, while the bridge streams audio to/from a PC or phone. SPI configures the bridge, creating a complete USB audio effects system.
Where can I find audio algorithm references, such as ready-made reverb or chorus code for the ADSP-21375KSWZ-2B?
ADI provides extensive audio algorithm libraries for the SHARC family, including many classic effects and building blocks for the ADSP-21375KSWZ-2B. These libraries come with source code, can be compiled and debugged in CCES, and are designed to run on evaluation boards for quick listening tests. By combining and tuning these modules, you can quickly assemble your own effect chain without writing low-level algorithms from scratch.