Analog Devices Inc. ADSP-2188MBST-266

Overview

ADSP-2188MBST-266 from Analog Devices is a 75 MIPS fixed-point DSP microcomputer optimized for real-time signal processing in embedded audio, telecom, and industrial control systems. It integrates 48K × 24-bit program RAM, 56K × 16-bit data RAM, dual SPORTs with hardware companding, 16-bit internal DMA port, and programmable 16-bit interval timer - all operating at 13.3 ns instruction cycle time (2.75 V core).

For engineers reviewing the ADSP-2188MBST-266 datasheet, ADSP-2188MBST-266 pinout, ADSP-2188MBST-266 application, or ADSP-2188MBST-266 equivalent, key selection criteria include on-chip memory partitioning (PM/DM), full-memory vs. host-mode bus configuration, SPORT framing flexibility, power-down recovery timing (200 CLKIN cycles), and ICE-Port™ debug interface compatibility.

Technical Context

The ADSP-2188MBST-266 implements the ADSP-2100 base architecture with three independent computational units (ALU, MAC, shifter), two DAGs supporting circular buffering and modulo addressing, and a zero-overhead loop sequencer. Its 3-bus architecture enables simultaneous dual operand fetches - one from program memory and one from data memory - within every instruction cycle.

It supports two distinct system interface modes: Full Memory Mode (Mode C = 0) with 14-bit address / 24-bit data bus for external overlay memory and I/O peripherals, and Host Mode (Mode C = 1) using a multiplexed 16-bit IDMA port with dedicated control signals (IWR, IRD, IAL, IS, IACK). Pin functionality is mode-determined at RESET and fixed thereafter.

Key Specifications

Pinout & Package

ADSP-2188MBST-266 is packaged in a 100-lead LQFP (ST-100) with 0.5 mm pitch. Pin functions are mode-dependent: Full Memory Mode uses A13:A0 and D23:D0 for external memory access; Host Mode repurposes pins for IAD15:IAD0, IWR, IRD, IAL, IS, and IACK. All MODE pins (A–D) are sampled only at RESET and define boot configuration and bus mode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2188MBST-266, the ADSP-2189M offers higher performance in BGA form but sacrifices LQFP accessibility, while the TMS320VC5402 demands full firmware rework and lacks integrated companding - making ADSP-2188MBST-266 optimal for new audio-centric designs needing proven LQFP reliability and minimal external components.

Availability

ADSP-2188MBST-266 is available at Aetrix Electronics and suitable for voice communications systems, digital audio processing platforms, industrial motor controllers, test & measurement instruments, and portable DSP-based analyzers requiring stable component supply across extended product lifecycles.

Supply support for ADSP-2188MBST-266 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 leader in high-performance analog, mixed-signal, and DSP technology, serving precision instrumentation, communications, and industrial markets since 1965.

The ADSP-2100 family - including ADSP-2188MBST-266 - was engineered for deterministic, low-latency digital signal processing in resource-constrained embedded systems where on-chip memory integration and real-time debug capability are critical.

FAQ

What is the maximum external memory size supported by ADSP-2188MBST-266 in Full Memory Mode?

In Full Memory Mode (Mode C = 0), ADSP-2188MBST-266 supports up to 4 MByte of external byte memory via the BDMA port and 4 MByte of I/O memory space. The 14-bit address bus (A13:A0) combined with memory select signals (PMS, DMS, IOMS, BMS, CMS) enables decoding across multiple memory regions - though total accessible linear space remains constrained by the 24-bit external data bus width and mode-specific addressing logic.

Does ADSP-2188MBST-266 support booting from external parallel EPROM?

Yes, ADSP-2188MBST-266 supports automatic booting from byte-wide external memory (e.g., EPROM or flash) through its BDMA port. During reset, the device executes a predefined boot sequence that loads the first 64 words into program memory. This requires proper configuration of mode pins and wait-state settings to match the EPROM's access timing - documented in the "Bootstrap Loading" section of the datasheet.

Can SPORT0 and SPORT1 operate simultaneously with different frame formats?

Yes, ADSP-2188MBST-266 allows SPORT0 and SPORT1 to run independently with distinct frame sync configurations, bit lengths (3–16 bits), clock sources (internal or external), and companding modes (A-law or µ-law). Each SPORT has dedicated control registers, enabling concurrent TDM reception on SPORT0 and µ-law encoded voice transmission on SPORT1 without resource conflict.

What is the function of the PWDACK pin on ADSP-2188MBST-266?

PWDACK (Power-Down Acknowledge) is an output pin on ADSP-2188MBST-266 that goes active-low to confirm successful entry into power-down mode after the PWD input is asserted. It signals to external circuitry (e.g., voltage regulators or clock gates) that the DSP core has completed state retention and entered ultra-low-power standby - enabling coordinated system-level power management.

Is ADSP-2188MBST-266 pin-compatible with other ADSP-218x devices?

ADSP-2188MBST-266 shares the same 100-lead LQFP package and pinout with ADSP-2186M and ADSP-2187M, but differs from ADSP-2189M (144-ball Mini-BGA). While core peripherals and memory maps are family-consistent, differences in on-chip resources (e.g., ADSP-2189M adds 8K extra data RAM) and certain control bits mean firmware is not binary-compatible without verification - especially for BDMA and timer register usage.