Analog Devices Inc. ADSP-2185LBSTZ-160

Overview

ADSP-2185LBSTZ-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 features single-cycle instruction execution, zero-overhead looping, and hardware companding per CCITT G.711-used in real-time audio processing, telecom channel banks, and embedded voice codecs.

For engineers reviewing the ADSP-2185LBSTZ-160 datasheet, ADSP-2185LBSTZ-160 pinout, ADSP-2185LBSTZ-160 application, or ADSP-2185LBSTZ-160 equivalent, key selection criteria include its 100-pin TQFP package, 30 ns instruction cycle time, 16-bit internal DMA port, byte-wide external memory interface up to 4 MByte, and ICE-Port™ emulation support for in-system debugging.

Technical Context

The ADSP-2185LBSTZ-160 implements the ADSP-2100 family 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 subroutine calls in one cycle. 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 operating modes: Full Memory Mode (14-bit address bus, 24-bit data bus) and Host Mode (16-bit multiplexed IDMA address/data bus), selected via Mode C pin at reset. Serial ports are software-configurable for framing, clock source (internal/external), word length (3–16 bits), and optional A-law/µ-law companding-enabling flexible integration into multi-channel TDM systems and UART-emulated control interfaces.

Key Specifications

Pinout & Package

ADSP-2185LBSTZ-160 is housed in a 100-lead thin quad flat pack (TQFP) with 0.5 mm pitch, thermally enhanced for sustained 33 MIPS operation in compact industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2185LBSTZ-160, ADSP-2189MKSTZ-160 offers cache-enhanced determinism for tight real-time loops, while TMS320C549PGE trades integrated peripherals for higher peak performance-making ADSP-2185LBSTZ-160 optimal for cost-sensitive, companding-dependent voice systems requiring minimal external components.

Availability

ADSP-2185LBSTZ-160 is available at Aetrix Electronics and suitable for voice codec systems, telecom channel banks, industrial audio analyzers, and embedded radar signal processors requiring stable component supply across extended production lifecycles.

Supply support for ADSP-2185LBSTZ-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 global leader in high-performance analog, mixed-signal, and DSP technology, serving industrial, automotive, communications, and consumer markets since 1965.

The ADSP-21xx family was designed specifically for real-time digital signal processing in resource-constrained embedded systems-emphasizing low-latency instruction execution, on-chip memory integration, and hardware acceleration for audio, telecom, and control algorithms.

FAQ

What clock frequency is required for ADSP-2185LBSTZ-160 to achieve its rated 33 MIPS performance?

The ADSP-2185LBSTZ-160 requires a 16.67 MHz input clock applied to the CLKIN pin (or a crystal across CLKIN/XTAL) to achieve its specified 30 ns instruction cycle time and 33 MIPS sustained throughput. This clock frequency is exactly half the internal instruction rate, as confirmed in the ADSP-2185LBSTZ-160 datasheet revision 0, page 7. Using any other frequency will result in non-compliant timing margins and potential functional failure.

Does ADSP-2185LBSTZ-160 support in-system debugging without removing the chip from the PCB?

Yes, ADSP-2185LBSTZ-160 integrates on-chip emulation support via the 14-pin ICE-Port™ interface, enabling full in-circuit debugging-including breakpoints, register inspection, and instruction-level emulation-without removing the device from the target board. The ADSP-2185LBSTZ-160 datasheet explicitly states that "the ADSP-2185 device need not be removed from the target system when using the EZ-ICE®*," confirming true in-system capability.

Can ADSP-2185LBSTZ-160 directly interface with standard 8-bit EPROMs for boot loading?

Yes, ADSP-2185LBSTZ-160 supports automatic booting from byte-wide external memory such as EPROM via its Byte DMA (BDMA) port. The BDMA port is bidirectional and can directly address up to 4 MByte of external byte-memory space, allowing seamless loading of program code into on-chip RAM at power-up-verified in the ADSP-2185LBSTZ-160 datasheet section "SYSTEM INTERFACE" and "GENERAL DESCRIPTION."

What is the maximum external memory capacity accessible by ADSP-2185LBSTZ-160 in Full Memory Mode?

In Full Memory Mode (Mode C = 0), ADSP-2185LBSTZ-160 provides a 14-bit address bus (A13:0) and 24-bit data bus (D23:0), enabling access to up to 4 MByte of byte-addressable external memory space. This capacity supports storage of large program overlays, coefficient tables, or data buffers-as documented in the ADSP-2185LBSTZ-160 datasheet "Memory Interface Pins" section and Figure 2.

How does the power-down feature of ADSP-2185LBSTZ-160 differ from standard idle mode?

ADSP-2185LBSTZ-160 offers three distinct low-power states: Power-Down (deepest, ~µA quiescent current, 100-cycle recovery), Idle (clock-gated, retains RAM state, interrupt-wakeup), and Slow Idle (reduced internal clock via IDLE(n) instruction). Unlike Idle mode, Power-Down halts all internal clocks and requires explicit PWD signal assertion or software bit setting-detailed in the ADSP-2185LBSTZ-160 datasheet "LOW POWER OPERATION" section.