Analog Devices Inc. ADSP-2185KSTZ-133

Overview

ADSP-2185KSTZ-133 from Analog Devices is a 33 MIPS fixed-point DSP microcomputer optimized for real-time audio, telecom, and industrial control applications. It integrates 16K × 24-bit on-chip program RAM, 16K × 16-bit on-chip data RAM, dual 16-bit synchronous serial ports (SPORT0/SPORT1), a 16-bit internal DMA port, and a programmable 16-bit interval timer - all in a 100-lead TQFP package operating at 30 ns instruction cycle time.

For engineers reviewing the ADSP-2185KSTZ-133 datasheet, ADSP-2185KSTZ-133 pinout, ADSP-2185KSTZ-133 application, or ADSP-2185KSTZ-133 equivalent, key selection criteria include on-chip memory configuration (32 KB total RAM), dual SPORT support with hardware companding, 100-cycle power-down recovery, ICE-Port™ debug interface compatibility, and full ADSP-2100 family code compatibility with extended bit-manipulation instructions.

Technical Context

The ADSP-2185KSTZ-133 implements a three-bus Harvard architecture with independent ALU, MAC, and barrel shifter units, enabling single-cycle execution of multifunction instructions (e.g., dual operand fetch + computation). Its dual DAGs support automatic modulo addressing for circular buffers, and the program sequencer delivers zero-overhead looping via internal loop counters and stacks.

System interfacing is configurable between Full Memory Mode (14-bit address bus, 24-bit data bus) and Host Mode (16-bit multiplexed IDMA bus), with programmable wait states, bus request/grant arbitration, and software-controllable power-down entry/exit. Serial communication supports 3–16-bit word lengths, A-law/µ-law companding per CCITT G.711, and frame-synchronous or frameless operation on both SPORTs.

Key Specifications

Pinout & Package

ADSP-2185KSTZ-133 is housed in a 100-lead thin quad flat package (TQFP) with 0.5 mm pitch, thermally enhanced for embedded industrial and audio applications. Pin functionality is mode-dependent: Full Memory Mode uses A13–A0 and D23–D0 for external memory expansion; Host Mode repurposes pins as IAD15–IAD0, IWR, IRD, IAL, IS, and IACK for IDMA interfacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2189MKBZ-133, ADSP-2185KSTZ-133 offers full RAM configurability for iterative firmware development, while versus TMS320C549PGE it delivers smaller form factor, lower system BOM (no external codec needed), and superior debug integration - making it optimal for space-constrained, low-volume, or rapidly evolving DSP designs.

Availability

ADSP-2185KSTZ-133 is available at Aetrix Electronics and suitable for professional audio processing, telecom voice coding, and industrial motor control requiring stable component supply across long-lifecycle embedded programs.

Supply support for ADSP-2185KSTZ-133 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 DSP technology, serving industrial, automotive, communications, and consumer markets since 1965.

The ADSP-2185KSTZ-133 belongs to the ADSP-2100 family of fixed-point DSP microcomputers, designed specifically for cost-sensitive, real-time embedded signal processing where deterministic latency, on-chip memory density, and debug accessibility are critical.

FAQ

What clock frequency does ADSP-2185KSTZ-133 require to achieve its rated 33 MIPS performance?

The ADSP-2185KSTZ-133 requires a 16.67 MHz input clock applied to CLKIN (or a 33.33 MHz crystal across CLKIN/XTAL) to achieve its 30 ns instruction cycle time and sustained 33 MIPS throughput. The internal clock generator doubles the CLKIN frequency, so external clock signals must be exactly half the desired instruction rate. This timing is verified in the ADSP-2185 datasheet Rev. 0, Section "Clock Signals".

Does ADSP-2185KSTZ-133 support hardware-based A-law and µ-law companding?

Yes, ADSP-2185KSTZ-133 integrates dedicated hardware companding engines in both SPORT0 and SPORT1, compliant with CCITT G.711 for real-time A-law and µ-law encoding/decoding. This offloads the CPU from software-based companding, reducing instruction cycles by up to 40% in voice codec applications - confirmed in the "Serial Ports" section of the ADSP-2185 datasheet Rev. 0.

Can ADSP-2185KSTZ-133 operate in a fully autonomous power-down mode with external wake-up capability?

Yes, ADSP-2185KSTZ-133 supports hardware-initiated power-down via the PWD pin, with wake-up triggered by any enabled interrupt (including external IRQ2, IRQL0, or SPORT receive events). Recovery completes within 100 CLKIN cycles, and the PWDACK pin signals successful entry - a feature documented in the "LOW POWER OPERATION" section of the ADSP-2185 datasheet Rev. 0.

Is ADSP-2185KSTZ-133 pin-compatible with other ADSP-2100 family members like ADSP-2181 or ADSP-2186?

No, ADSP-2185KSTZ-133 is not pin-compatible with ADSP-2181 (80-pin) or ADSP-2186 (144-pin); it uses a unique 100-lead TQFP footprint. However, it is instruction-set compatible with the ADSP-2100 family and includes backward-compatible extensions. Pin mapping differences are detailed in the "PIN DESCRIPTIONS" section of the ADSP-2185 datasheet Rev. 0.

What development tools are officially supported for ADSP-2185KSTZ-133 firmware creation and debugging?

Analog Devices officially supports the ADSP-2100 Family Development Software suite for ADSP-2185KSTZ-133, including the EZ-KIT Lite evaluation board, ADSP-2100 Assembler, Linker, Simulator, C Compiler (GNU-based), and EZ-ICE® emulator. The ICE-Port™ interface on ADSP-2185KSTZ-133 enables full in-circuit debugging without target board modification - as specified in the "Development System" section of the ADSP-2185 datasheet Rev. 0.