Analog Devices Inc. ADSP-2115KST-80

Overview

ADSP-2115KST-80 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), featuring dual serial ports (SPORT0 and SPORT1), a programmable interval timer, and enhanced Harvard architecture with three internal buses. It targets real-time audio processing, telecom channel framing, and industrial control loop execution.

For engineers reviewing the ADSP-2115KST-80 datasheet, ADSP-2115KST-80 pinout, ADSP-2115KST-80 application, or ADSP-2115KST-80 equivalent, key selection considerations include its 25 MIPS throughput, 80-lead TQFP package, dual serial port support with hardware companding, zero-overhead looping capability, and boot-from-EPROM functionality without external host interface.

Technical Context

The ADSP-2115KST-80 implements an enhanced Harvard architecture with separate program and dual data address buses, enabling simultaneous instruction fetch and dual operand access in one cycle. Its computational core integrates an ALU, multiplier/accumulator (MAC), and shifter-each capable of 16-bit operations-with direct interconnection via the R bus for pipelined multi-unit computation.

It supports automatic booting from byte-wide external EPROM using three initial wait states, and features two independent data address generators (DAGs) with modulo and bit-reverse addressing for circular buffer management in FFT and filter applications. Serial ports operate synchronously with configurable frame sync, A-law/µ-law companding, and double-buffered transmit/receive channels.

Key Specifications

Pinout & Package

ADSP-2115KST-80 is packaged in an 80-lead Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch, thermally enhanced for industrial ambient operation up to +70°C (K-grade). Pinout conforms to ADSP-21xx family standard layout for 80-lead PQFP/TQFP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2111KSTZ-80, ADSP-2115KST-80 delivers identical computational throughput and serial I/O capability in a space-saving 80-lead TQFP, while omitting the host interface port to reduce pin count and simplify PCB routing; versus ADSP-2101KP-80, it adds SPORT0 multichannel support and uses TQFP instead of PGA - critical for high-density surface-mount designs.

Availability

ADSP-2115KST-80 is available at Aetrix Electronics and suitable for industrial motor control, telecom channel framing, and audio effects processing requiring stable component supply across extended product lifecycles.

Supply support for ADSP-2115KST-80 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 company 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-2115KST-80, was designed for cost-sensitive, real-time embedded DSP applications demanding deterministic low-latency execution, compact on-chip memory, and flexible serial I/O - targeting voice, telecom, and control markets before the rise of general-purpose ARM-based DSPs.

FAQ

What is the maximum operating frequency of the ADSP-2115KST-80?

The ADSP-2115KST-80 operates at a maximum clock frequency of 25 MHz, corresponding to a 40 ns instruction cycle time. This speed is guaranteed under recommended operating conditions (5 V ± 10%, 0°C to +70°C ambient), and all instructions-including MAC, ALU, and memory accesses-execute in a single cycle at this rate. The ADSP-2115KST-80 achieves 25 MIPS throughput, consistent across its K-grade commercial temperature range.

Does the ADSP-2115KST-80 support hardware companding, and if so, which standards?

Yes, the ADSP-2115KST-80 supports hardware A-law and µ-law companding in both serial ports (SPORT0 and SPORT1), compliant with CCITT Recommendation G.711. This feature operates transparently during data transfer without CPU intervention, reducing processing load and latency in voice-band applications. Companding is enabled per-port via control register bits and applies to all serial data words transmitted or received through the respective SPORT.

What package type and pin count does the ADSP-2115KST-80 use?

The ADSP-2115KST-80 is supplied in an 80-lead Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch and exposed thermal pad. This package is distinct from the 68-pin PGA used by ADSP-2101 or the 100-pin packages of ADSP-2111. The TQFP footprint supports high-density surface-mount assembly and provides thermal performance suitable for industrial ambient temperatures up to +70°C.

Can the ADSP-2115KST-80 boot from external memory, and what interface does it require?

Yes, the ADSP-2115KST-80 supports automatic booting from byte-wide external EPROM or flash memory. After RESET assertion, it generates three initial wait states and reads boot code sequentially from external memory mapped to the boot address space. The interface uses the shared external address/data bus with BMS/DMS/PMS signals to decode memory space, requiring no external glue logic for basic boot configuration.

How many serial ports does the ADSP-2115KST-80 have, and what are their key capabilities?

The ADSP-2115KST-80 includes two fully independent synchronous serial ports: SPORT0 and SPORT1. SPORT0 supports multichannel TDM (24- or 32-word frames) and is commonly used for telecom backplanes; SPORT1 supports standard point-to-point links. Both ports feature double-buffered transmit/receive, hardware A-law/µ-law companding, programmable clocking, and autobuffering with single-cycle overhead per word - enabling real-time streaming without CPU polling.