Analog Devices Inc. ADSP-2185LBST-160

Overview

ADSP-2185LBST-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 all instructions in a single 30 ns cycle and supports zero-overhead looping, power-down mode with 100-cycle recovery, and ICE-Port™ emulation. Used in real-time audio processing, telecom channel banks, and embedded control systems requiring deterministic low-latency computation.

For engineers reviewing the ADSP-2185LBST-160 datasheet, ADSP-2185LBST-160 pinout, ADSP-2185LBST-160 application, or ADSP-2185LBST-160 equivalent, key selection criteria include instruction cycle time, on-chip memory configuration, serial port framing flexibility, power-down recovery latency, and ICE-Port™ debug compatibility in final-system deployment.

Technical Context

The ADSP-2185LBST-160 implements a three-bus Harvard architecture with independent ALU, MAC, and shifter units operating on 16-bit data paths, enabling simultaneous dual operand fetches and multifunction instructions per cycle. 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 integrates dual SPORTs with hardware A-law/µ-law companding per CCITT G.711, programmable 16-bit interval timer with prescaler, 13 programmable flag pins (8 I/O configurable), and flexible memory interface supporting Full Memory Mode (14-bit address, 24-bit data) or Host Mode (16-bit IDMA bus). Power management includes software/hardware-initiated power-down with nonmaskable interrupt wake-up and Slow Idle with selectable clock divisors (16/32/64/128).

Key Specifications

Pinout & Package

ADSP-2185LBST-160 is housed in a 100-lead Thin Quad Flat Package (TQFP) with 0.5 mm pitch, thermally enhanced for sustained 33 MIPS operation. Pin functionality is multiplexed during RESET (e.g., Mode C/PF2) or runtime (e.g., SPORT1/IRQ0/IRQ1/FI/FO), requiring careful initialization sequence design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2185LBST-160, ADSP-2189MKST-160 offers drop-in compatibility with added boot security and trace depth, while TMS320C549PGE trades integrated peripherals and debug simplicity for raw speed and memory scale-requiring external glue logic and different PCB layout.

Availability

ADSP-2185LBST-160 is available at Aetrix Electronics and suitable for voice codec interfaces, industrial motor control systems, portable medical instrumentation, and communications baseband processing requiring stable component supply across long-lifecycle embedded programs.

Supply support for ADSP-2185LBST-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 analog, mixed-signal, and digital signal processing technologies since 1965.

The ADSP-21xx family was designed for real-time embedded signal processing in resource-constrained systems where deterministic latency, low power, and on-chip integration outweigh raw clock speed-targeting audio, telecom, and industrial control markets.

FAQ

What clock source options does the ADSP-2185LBST-160 support?

The ADSP-2185LBST-160 accepts either a 16.67 MHz TTL-compatible clock applied to CLKIN (with XTAL left unconnected) or a parallel-resonant fundamental-mode crystal across CLKIN/XTAL pins. The internal oscillator automatically stabilizes the crystal; no external capacitors are required beyond those specified by the crystal manufacturer. Both configurations yield a 30 ns instruction cycle time, and CLKOUT reflects the internal instruction clock when enabled.

How does the ADSP-2185LBST-160 handle external memory interfacing in Full Memory Mode?

In Full Memory Mode (Mode C = 0), the ADSP-2185LBST-160 exposes 14 address lines (A13–A0) and 24 data lines (D23–D0), supporting up to 4 MByte byte-wide memory via the BDMA port. Memory select signals (BMS, IOMS, PMS, DMS, CMS) and control lines (RD, WR) allow independent decoding of program, data, byte, and I/O spaces. Programmable wait states accommodate slow peripherals without external logic.

Can the ADSP-2185LBST-160's serial ports be used for UART communication?

Yes-the ADSP-2185LBST-160's SPORT0 and SPORT1 can be software-reconfigured to emulate UART functionality by setting appropriate frame sync, clock, and data format parameters. This eliminates the need for discrete UART ICs in designs where asynchronous serial communication is required alongside synchronous audio or TDM traffic.

What is the role of the PWD and PWDACK pins on the ADSP-2185LBST-160?

PWD (Power-Down) is an active-low input that triggers hardware-initiated power-down mode; PWDACK is an open-drain output that goes low to confirm successful entry into the dormant state. Together, they enable coordinated system-level power management-e.g., disabling external memory clocks or switching DC-DC converters-only after the ADSP-2185LBST-160 has fully stabilized in low-power mode.

Does the ADSP-2185LBST-160 support in-circuit debugging without removing the chip from the target board?

Yes-the ADSP-2185LBST-160 integrates on-chip emulation support via its dedicated 14-pin ICE-Port™ interface. This allows full-speed, non-intrusive debugging-including breakpoint setting, register/memory inspection, and real-time trace-in the final production system without socketing or chip removal. The EZ-ICE® emulator connects directly to this port for seamless firmware validation.