Analog Devices Inc. ADSP-2185LKST-160

Overview

ADSP-2185LKST-160 from Analog Devices is a 33 MIPS fixed-point DSP microcomputer with 16K × 24-bit on-chip program RAM, 16K × 16-bit on-chip data RAM, and dual 16-bit synchronous serial ports (SPORT0/SPORT1). It executes instructions in 30 ns cycles, supports zero-overhead looping, and integrates power-down mode with 100-cycle wake-up-used in real-time audio processing, telecom channel banks, and embedded control systems requiring deterministic low-latency computation.

For engineers reviewing the ADSP-2185LKST-160 datasheet, ADSP-2185LKST-160 pinout, ADSP-2185LKST-160 application, or ADSP-2185LKST-160 equivalent, key selection criteria include instruction cycle time, on-chip memory configuration, serial port framing flexibility, power-down recovery latency, and TQFP-100 package compatibility with legacy ADSP-2100 family designs.

Technical Context

The ADSP-2185LKST-160 implements a three-bus Harvard architecture with independent ALU, MAC, and shifter units operating on 16-bit data paths, enabling single-cycle dual operand fetches and multifunction instructions. Its program sequencer delivers zero-overhead loops and conditional execution, while two dedicated DAGs support circular buffering and modulo addressing for FFT and filter kernels.

It features dual SPORTs with hardware A-law/µ-law companding per CCITT G.711, programmable 16-bit interval timer with prescaler, and 13 programmable flag pins-six of which double as external interrupts (IRQ2, IRQL0/1, IRQE, IRQ0/1). Memory interface supports Full Memory Mode (14-bit address, 24-bit data) or Host Mode (16-bit IDMA bus), with configurable wait states for byte-wide EPROM or I/O peripherals.

Key Specifications

Pinout & Package

ADSP-2185LKST-160 is housed in a 100-lead thin quad flat pack (TQFP) with 0.5 mm pitch, thermally enhanced for sustained DSP workloads. Pin functions are multiplexed across memory, serial, flag, and interrupt domains, with mode selection (Full Memory vs. Host) determined by Mode C (PF2) state at reset.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2185LKST-160, ADSP-2189MKSTZ-160 offers identical functionality with extended thermal qualification and JTAG, while TMS320C549PGE trades analog-peripheral integration for higher clock speed and larger memory-but demands full software rework due to ISA incompatibility.

Availability

ADSP-2185LKST-160 is available at Aetrix Electronics and suitable for voice communications terminals, digital audio processors, industrial motor controllers, and telecom channel banks requiring stable component supply across long-lifecycle deployments.

Supply support for ADSP-2185LKST-160 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 U.S.-based semiconductor company specializing in high-performance signal processing, data conversion, and RF technologies since 1965.

The ADSP-2185LKST-160 belongs to the ADSP-2100 family of fixed-point DSPs designed for real-time embedded systems where deterministic latency, on-chip memory integration, and low-power operation are essential-targeting audio, telecom, and industrial control markets.

FAQ

What is the maximum operating frequency and instruction throughput of the ADSP-2185LKST-160?

The ADSP-2185LKST-160 operates with a 30 ns instruction cycle time, delivering 33 million instructions per second (MIPS) sustained throughput. It achieves this using a 16.67 MHz external clock (or crystal), which the on-chip oscillator doubles to generate the internal 33 MHz core clock. Every instruction-including ALU, MAC, and shifter operations-executes in a single cycle, with no pipeline stalls under normal conditions.

Does the ADSP-2185LKST-160 support hardware-based audio companding, and if so, which standards?

Yes, the ADSP-2185LKST-160 includes dedicated hardware for A-law and µ-law companding per CCITT Recommendation G.711. This capability is implemented within both SPORT0 and SPORT1, enabling real-time encoding and decoding of 8-bit compressed PCM audio without consuming CPU cycles or external components-ideal for voice gateways and PBX systems.

How does the power-down mode function in the ADSP-2185LKST-160, and what is its wake-up latency?

The ADSP-2185LKST-160 enters power-down mode via the PWD pin or software command, reducing current draw to CMOS standby levels. Wake-up occurs in exactly 100 CLKIN cycles-guaranteed and deterministic-allowing rapid resumption of real-time tasks. The PWDACK pin asserts to confirm entry, and the nonmaskable power-down interrupt can trigger context save/restore before sleep.

Can the ADSP-2185LKST-160 be used in systems requiring JTAG debugging, and what debug interface does it provide?

The ADSP-2185LKST-160 does not support JTAG; instead, it features Analog Devices' proprietary ICE-Port™ interface-a 14-pin dedicated emulation port supporting in-circuit debugging, register/memory inspection, breakpoint setting, and instruction-level tracing. While not JTAG-compliant, ICE-Port™ enables full non-intrusive debug in final-system environments without requiring socketed devices or adapters.

What memory configurations and addressing modes are supported by the ADSP-2185LKST-160?

The ADSP-2185LKST-160 supports two primary memory modes: Full Memory Mode (Mode C = 0) with 14-bit address bus (A13:A0) and 24-bit data bus (D23:D0), enabling access to 4 MB byte memory and 2048-location I/O space; and Host Mode (Mode C = 1) using a 16-bit multiplexed IDMA bus (IAD15:IAD0) with separate IWR/IRD controls for microcontroller interfacing. Both modes support programmable wait states.