Analog Devices Inc. ADSP-2185NKCA-320

Overview

ADSP-2185NKCA-320 from Analog Devices is a 16-bit fixed-point DSP microcomputer optimized for real-time signal processing in embedded systems. It delivers 80 MIPS sustained performance at 12.5 ns instruction cycle time (1.8 V core), features 16K words of on-chip program RAM and 16K words of data RAM, dual serial ports with hardware companding, and supports full-memory and host modes via configurable boot pins.

For engineers reviewing the ADSP-2185NKCA-320 datasheet, ADSP-2185NKCA-320 pinout, ADSP-2185NKCA-320 application, or ADSP-2185NKCA-320 equivalent, key selection criteria include on-chip memory size, 100-lead LQFP package compatibility, 1.8 V core voltage operation, dual SPORT interface timing, and power-down recovery within 200 CLKIN cycles.

Technical Context

The ADSP-2185NKCA-320 implements the ADSP-2100 base architecture with three independent computational units (ALU, MAC, shifter), two dedicated data address generators (DAG1/DAG2), and a zero-overhead program sequencer supporting conditional jumps and nested loops. Its 3-bus architecture enables simultaneous dual operand fetches per instruction cycle.

It integrates two double-buffered synchronous serial ports (SPORT0/SPORT1) with programmable frame sync, 3–16 bit word length, and A-law/μ-law companding per CCITT G.711. Memory interface supports byte-wide EPROM booting, 4 MB external address space, and selectable wait states for slow peripherals.

Key Specifications

Pinout & Package

ADSP-2185NKCA-320 is housed in a 100-lead LQFP package (Pb-free, RoHS-compliant). Pin functions are defined per Analog Devices ADSP-218xN Rev. A datasheet, with dedicated signal groups for memory interface, serial I/O, timer, flag I/O, and power management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2185NKCA-320, ADSP-2186NKCA-320 offers reduced memory for cost-sensitive motor control, while ADSP-2188NKCA-320 provides scalable headroom for advanced audio analytics - all share identical pinout, instruction set, and power-down behavior.

Availability

ADSP-2185NKCA-320 is available at Aetrix Electronics and suitable for voice communications terminals, digital audio processing systems, and industrial motor control modules requiring stable component supply across extended production lifecycles.

Supply support for ADSP-2185NKCA-320 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision engineering applications.

The ADSP-218xN series was designed as a low-power, code-compatible evolution of the ADSP-2100 family - targeting portable audio, telecom infrastructure, and real-time control where deterministic 16-bit fixed-point performance and integrated memory are essential.

FAQ

What is the core voltage requirement for reliable operation of the ADSP-2185NKCA-320?

The ADSP-2185NKCA-320 requires a nominal 1.8 V ±0.1 V supply for its core logic (VDDINT), as specified in the Absolute Maximum Ratings and Recommended Operating Conditions sections of the ADSP-218xN Rev. A datasheet. I/O banks support 1.8 V, 2.5 V, or 3.3 V operation independently, with all inputs tolerant up to 3.6 V regardless of selected I/O voltage. Deviation beyond ±0.1 V on VDDINT risks timing violations or functional failure.

Does the ADSP-2185NKCA-320 support crystal oscillator startup without external circuitry?

Yes, the ADSP-2185NKCA-320 includes an on-chip oscillator circuit and supports direct crystal connection between CLKIN and XTAL pins. Per the ADSP-218xN Rev. A datasheet, a parallel-resonant fundamental-frequency crystal with appropriate load capacitors (as specified by the crystal manufacturer) and a feedback resistor across the crystal terminals is required for stable startup. No external oscillator IC is needed.

How does the power-down recovery time of the ADSP-2185NKCA-320 impact real-time system design?

The ADSP-2185NKCA-320 guarantees recovery from hardware- or software-initiated power-down within 200 CLKIN cycles, as confirmed in the Low-Power Operation section of the ADSP-218xN Rev. A datasheet. At 40 MHz CLKIN (12.5 ns cycle), this equals 5 µs maximum wake-up latency - enabling use in burst-mode voice activity detection or event-triggered sensor acquisition where sub-10 µs responsiveness is required.

Can the ADSP-2185NKCA-320 execute instructions from external memory?

No - the ADSP-2185NKCA-320 executes all instructions exclusively from its on-chip program memory (16K × 24-bit RAM). External memory is accessible only for data transfers via the byte DMA port (BDMA) or internal DMA port (IDMA), or for boot loading during reset. The architecture enforces Harvard memory separation: program fetches occur only from internal program RAM, ensuring deterministic timing critical for real-time DSP tasks.

Is the ADSP-2185NKCA-320 pin-compatible with other ADSP-218xN series devices?

Yes, the ADSP-2185NKCA-320 is fully pin-compatible with all members of the ADSP-218xN series (ADSP-2184N, -2186N, -2187N, -2188N, -2189N) in the same package variant - specifically the 100-lead LQFP. This is explicitly stated in the General Description section of the ADSP-218xN Rev. A datasheet: "All series members are pin-compatible and are differentiated solely by the amount of on-chip SRAM."