Analog Devices Inc. ADSP-21065LCCA-240

Overview

ADSP-21065LCCA-240 from Analog Devices is a 32-bit SHARC® floating-point DSP microcomputer optimized for high-throughput signal processing in audio, communications, and industrial systems. It delivers 198 MFLOPS peak performance, integrates 544 Kbits of configurable dual-ported SRAM, supports I²S with eight simultaneous Tx/Rx channels, and operates at 66 MHz core frequency (15 ns cycle time) with 3.3 V supply.

For engineers reviewing the ADSP-21065LCCA-240 datasheet, ADSP-21065LCCA-240 pinout, ADSP-21065LCCA-240 application, or ADSP-21065LCCA-240 equivalent, key selection considerations include its 208-lead MQFP package, SDRAM controller for glueless external memory interface, dual serial ports with TDM/I²S support, and code compatibility within the ADSP-2106x family.

Technical Context

The ADSP-21065LCCA-240 implements the Super Harvard Architecture with four independent buses enabling simultaneous instruction fetch, dual data reads/writes, and I/O operations per cycle. Its computation units-ALU, multiplier, and barrel shifter-execute parallel single-cycle instructions supporting IEEE 32-bit single-precision and 40-bit extended-precision floating-point arithmetic.

It features two hardware-implemented data address generators (DAG1/DAG2) for automatic circular buffer management, an on-chip instruction cache to sustain full-speed looped execution (e.g., FFT butterflies), and a 10-channel DMA controller with dedicated paths for external port and serial ports-enabling background transfers without CPU intervention.

Key Specifications

Pinout & Package

ADSP-21065LCCA-240 is housed in a 208-lead plastic quad flat pack (MQFP) with 0.5 mm lead pitch, designed for reflow soldering and thermal dissipation in compact signal-processing modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-21065LCCA-240, ADSP-21062KS-240 trades SDRAM integration and pin count for smaller footprint, while ADSP-21369BSWZ-4B delivers significantly higher compute density and modern peripherals at the cost of legacy toolchain compatibility and higher power.

Availability

ADSP-21065LCCA-240 is available at Aetrix Electronics and suitable for professional audio equipment, automotive noise control systems, industrial motor drives, and communications infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for ADSP-21065LCCA-240 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers and manufacturing facilities worldwide.

The ADSP-21065LCCA-240 belongs to the SHARC® family of 32-bit floating-point DSPs, engineered for computationally intensive, real-time signal processing in cost-sensitive industrial, audio, and communications applications where precision, determinism, and memory integration are critical.

FAQ

What clock frequency does the ADSP-21065LCCA-240 require to achieve its rated 66 MHz core speed?

The ADSP-21065LCCA-240 requires a 33 MHz TTL-compatible input clock (CLKIN) to operate at its rated 66 MHz instruction rate, since its internal phase-locked loop doubles the input frequency. This 15 ns cycle time is validated across commercial temperature ranges and is used in all published benchmarks, including the 1024-point complex FFT timing of 0.274 ms. The device also supports crystal oscillator input directly on CLKIN.

Does the ADSP-21065LCCA-240 support booting from external memory, and what interfaces are available?

Yes, the ADSP-21065LCCA-240 supports booting from external 8-bit EPROM, host processor, or external memory via its external port. Boot source selection is controlled by the BMS (Boot Memory Select) and BSEL (EPROM Boot) pins. Host booting supports 8-, 16-, and 32-bit host processors, and the host can directly write to IOP registers and DMA setup registers during initialization - a capability confirmed in the ADSP-21065L User's Manual and EE-107 application note.

How does the dual-ported SRAM in the ADSP-21065LCCA-240 improve real-time performance compared to single-ported alternatives?

The ADSP-21065LCCA-240's 544 Kbits of dual-ported SRAM is split into two independent banks (Block 0 and Block 1), each accessible simultaneously by the core processor and DMA controller. This eliminates memory arbitration stalls - for example, while the core executes a filter algorithm from Block 0, DMA can concurrently fill Block 1 with incoming audio samples from a SPORT. This architecture sustains 132 MFLOPS sustained performance, as verified in benchmark testing and documented in Table I of the datasheet.

Can the ADSP-21065LCCA-240 interface directly with standard audio codecs, and which protocols are supported?

Yes, the ADSP-21065LCCA-240 supports direct glueless interfacing with industry-standard audio codecs via its two enhanced serial ports (SPORT0 and SPORT1). Each SPORT supports I²S mode for stereo/multichannel audio, TDM multichannel mode with μ-law/A-law hardware companding, and DSP serial port mode. Application notes TN-1 and EE-191 confirm interoperability with AC-97 codecs (e.g., AD1819A) and I²S-compatible devices, enabling eight simultaneous receive and transmit channels.

What development tools are officially supported for the ADSP-21065LCCA-240, and are they still maintained?

The ADSP-21065LCCA-240 is fully supported by Analog Devices' VisualDSP++ 5.0 integrated development environment, including the SHARC Assembler, C compiler, cycle-accurate simulator, and EZ-ICE® in-circuit emulator. While newer SHARC+ processors use CrossCore Embedded Studio (CCES), VisualDSP++ remains actively maintained for legacy SHARC devices - with documentation, application notes (e.g., EE-104, EE-112), and anomaly lists updated through 2017, and continued technical support via EngineerZone and regional FAE teams.