Analog Devices Inc. ADSP-21065LCSZ-240

Overview

ADSP-21065LCSZ-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 66 MIPS, 198 MFLOPS peak performance, features 544 Kbits of configurable dual-ported on-chip SRAM, and supports I²S with eight simultaneous transmit/receive channels. Its 208-lead MQFP package operates at 3.3 V with a 15 ns instruction cycle (66 MHz core).

For engineers reviewing the ADSP-21065LCSZ-240 datasheet, ADSP-21065LCSZ-240 pinout, ADSP-21065LCSZ-240 application, or ADSP-21065LCSZ-240 equivalent, key selection criteria include sustained 132 MFLOPS compute throughput, SDRAM controller integration for glueless external memory expansion, dual serial ports with TDM/I²S support, and code compatibility across the ADSP-2106x family.

Technical Context

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

It integrates a 10-port 32-register data file, two hardware circular-buffer-capable DAGs, on-chip instruction cache, and ten-channel DMA (eight serial, two external port). Memory mapping includes unified 64M-word external address space, dual-banked SRAM (288 Kbits + 256 Kbits), and SDRAM interface operating at 66 MHz with up to 220 Mbytes/sec transfer rate.

Key Specifications

Pinout & Package

ADSP-21065LCSZ-240 is housed in a 208-lead plastic quad flat pack (MQFP) with 0.5 mm lead pitch, RoHS-compliant, and rated for commercial temperature range (0°C to +70°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar floating-point DSP applications.

Compared with ADSP-21065LCSZ-240, the ADSP-21060KS-133 offers higher clock speed but omits SDRAM and I²S-critical for cost-sensitive audio systems-while the ADSP-21161NKSZ-200 delivers superior compute density and PCI support at the expense of audio-specific peripherals and MQFP packaging.

Availability

ADSP-21065LCSZ-240 is available at Aetrix Electronics and suitable for professional audio equipment, telecom infrastructure, industrial motor drives, and medical imaging systems requiring stable component supply and long-term obsolescence management.

Supply support for ADSP-21065LCSZ-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-21065LCSZ-240 belongs to the SHARC® family-designed specifically for computationally intensive, real-time signal processing applications demanding both floating-point precision and deterministic low-latency execution in audio, communications, and industrial control.

FAQ

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

The ADSP-21065LCSZ-240 requires a 33 MHz input clock on CLKIN to achieve its 66 MHz instruction rate (15 ns cycle time). This is because the internal clock generator doubles the input frequency. The device supports both crystal oscillator (via CLKIN/XTAL) and TTL-compatible external clock sources, and timing specifications for SDRAM, serial ports, and external memory are all referenced to this 33 MHz base.

Does the ADSP-21065LCSZ-240 support booting from external memory, and how is it configured?

Yes, the ADSP-21065LCSZ-240 supports booting from external memory. Configuration is controlled by the BMS and BSEL pins: when BSEL = 0 and BMS = 0, the device skips booting and begins execution from external memory. This mode requires the external memory to be mapped at address 0x000000 and preloaded with valid executable code before reset release.

How many serial channels does the ADSP-21065LCSZ-240 support in I²S mode, and what is the physical pin allocation?

The ADSP-21065LCSZ-240 supports eight simultaneous I²S channels-four receive and four transmit-using its two SPORTs (SPORT0 and SPORT1), each with dual independent channels (A and B). Physically, this maps to DT0A/DR0A/TCLK0/RCLK0/TFS0/RFS0 for SPORT0 and DT1A/DR1A/TCLK1/RCLK1/TFS1/RFS1 for SPORT1, with identical signals available on channel B pins.

Is the ADSP-21065LCSZ-240 pin-compatible with other ADSP-2106x family members, and what does "code-compatible" mean in practice?

The ADSP-21065LCSZ-240 is not pin-compatible with ADSP-21060/21061/21062 due to differing package types (208-MQFP vs. 196-BGA) and signal routing. However, it is fully code-compatible: object code compiled for ADSP-21060KS-133 runs unmodified on ADSP-21065LCSZ-240, preserving instruction set, register map, and memory model-enabling software reuse across SHARC platforms.

What is the maximum achievable data transfer rate between two ADSP-21065LCSZ-240 devices in a multiprocessing configuration?

In a two-device multiprocessing system with distributed bus arbitration, the ADSP-21065LCSZ-240 achieves a maximum interprocessor data transfer rate of 132 Mbytes/sec over the external parallel bus. This assumes 33 MHz bus operation, full 32-bit data width, and optimal burst-mode transfers with minimal wait states-verified in benchmarked configurations using the built-in multiprocessor interface.