Analog Devices Inc. ADSP-2115BS-66

Overview

ADSP-2115BS-66 from Analog Devices is a 16-bit fixed-point DSP microprocessor with on-chip 1K × 16-bit data RAM and 1K × 16-bit program RAM, operating at 25 MHz (40 ns instruction cycle), supporting dual serial ports (SPORT0 and SPORT1), zero-overhead looping, and automatic booting from byte-wide EPROM - deployed in real-time audio processing and telecom line-card signal conditioning.

For engineers reviewing the ADSP-2115BS-66 datasheet, ADSP-2115BS-66 pinout, ADSP-2115BS-66 application, or ADSP-2115BS-66 equivalent, key selection criteria include instruction cycle time, on-chip memory configuration, serial port count and framing capability, interrupt latency, and TQFP-80 package compatibility for high-density PCB layouts.

Technical Context

The ADSP-2115BS-66 implements an enhanced Harvard architecture with three independent buses: program memory address/data and dual data memory address/data paths. Its ALU, multiplier/accumulator, and shifter operate in parallel, enabling single-cycle execution of multifunction instructions including multiply-accumulate and bit-reverse addressing.

It features two dedicated data address generators (DAGs) with modulo and bit-reverse addressing support, programmable interval timer with 16-bit TCOUNT/TPERIOD registers, and dual synchronous serial ports with hardware A-law/μ-law companding per CCITT G.711 - all synchronized to a 25 MHz master clock with 40 ns timing resolution.

Key Specifications

Pinout & Package

ADSP-2115BS-66 is packaged in an 80-lead TQFP (Thin Quad Flat Package) with 0.5 mm lead pitch, 12 mm × 12 mm body size, and exposed thermal pad - optimized for convection-cooled industrial PCBs requiring < 1.5 W total power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2115BS-66, ADSP-2115KS-66 trades thermal robustness for package availability, while ADSP-2105KS-66 sacrifices multichannel I/O and data memory depth to meet lower-cost embedded control requirements - neither offers pin compatibility or identical feature parity.

Availability

ADSP-2115BS-66 is available at Aetrix Electronics and suitable for voice codec engines, telecom line cards, industrial motor controllers, and audio effects processors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADSP-2115BS-66 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial systems.

The ADSP-2100 Family - including ADSP-2115BS-66 - was engineered for real-time deterministic signal processing in resource-constrained embedded systems, emphasizing low-latency I/O, on-chip memory efficiency, and compiler-friendly instruction architecture.

FAQ

What is the maximum operating frequency of the ADSP-2115BS-66?

The ADSP-2115BS-66 operates at a maximum clock frequency of 25 MHz, corresponding to a 40 ns instruction cycle time. This rating is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5 V ± 5% supply, enabling deterministic execution of time-critical signal processing tasks such as 8 kHz voice sampling with sub-100 μs latency. The ADSP-2115BS-66 does not support overclocking beyond this specification.

Does the ADSP-2115BS-66 support multichannel serial communication?

Yes, the ADSP-2115BS-66 supports multichannel operation exclusively through SPORT0, which handles 24- or 32-word time-division multiplexed (TDM) serial streams - ideal for T1/E1 line interfaces and multi-microphone array preprocessing. SPORT1 lacks multichannel capability but provides hardware A-law/μ-law companding and optional flag I/O remapping. The ADSP-2115BS-66 does not include a host interface port (HIP), distinguishing it from the ADSP-2111.

What memory resources are integrated into the ADSP-2115BS-66?

The ADSP-2115BS-66 integrates 1K × 16-bit (2048 bytes) of on-chip data RAM and 1K × 16-bit (2048 bytes) of on-chip program RAM. These memories are SRAM-based, fully random-access, and support simultaneous read/write operations via dedicated buses. No ROM or flash is included; program code must be loaded at boot from external EPROM or executed directly from on-chip RAM after initialization. The ADSP-2115BS-66 does not support external program memory expansion beyond its native 15K-word address space.

Can the ADSP-2115BS-66 boot from external memory without additional logic?

Yes, the ADSP-2115BS-66 supports automatic booting from byte-wide external EPROM using its built-in boot loader circuitry. After reset, it generates three wait states by default, allowing direct interfacing with standard 200 ns EPROMs without external glue logic. Boot mode is controlled solely by the BMODE pin state; no software configuration or host processor involvement is required. The ADSP-2115BS-66 does not support SPI or serial flash boot modes.

What package type and thermal characteristics does the ADSP-2115BS-66 use?

The ADSP-2115BS-66 is supplied in an 80-lead TQFP package (12 mm × 12 mm, 0.5 mm pitch) with an exposed thermal pad. Its industrial-grade temperature rating spans –40°C to +85°C, and typical power dissipation is 1.2 W at 25 MHz/5 V under full computational load. Thermal resistance (θ_JA) is 45°C/W with standard 2-layer PCB layout; the exposed pad must be soldered to a solid copper pour for reliable operation above 70°C ambient.