Analog Devices Inc. ADSP-2185LBST-210

Overview

ADSP-2185LBST-210 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-210 datasheet, ADSP-2185LBST-210 pinout, ADSP-2185LBST-210 application, or ADSP-2185LBST-210 equivalent, key selection criteria include instruction cycle time (30 ns), on-chip memory configuration (32 KB total RAM), serial port framing flexibility (3–16 bit words, µ-law/A-law companding), and TQFP-100 package compatibility with legacy ADSP-2100 family designs.

Technical Context

The ADSP-2185LBST-210 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 subroutine calls in one cycle. Its 3-bus architecture enables simultaneous dual operand fetches-one from program memory and one from data memory-within each instruction cycle.

It integrates dual SPORTs with hardware companding per CCITT G.711, a 16-bit internal DMA port for host-mode system interfacing, and byte DMA capable of addressing up to 4 MB of external memory. Power management includes software- or hardware-initiated power-down (100-cycle wake-up), idle mode, and slow-idle mode with programmable clock divisors (16/32/64/128).

Key Specifications

Pinout & Package

ADSP-2185LBST-210 is housed in a 100-lead thin quad flat pack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad. Pin functions are multiplexed across memory interface, serial I/O, interrupt, flag, and emulation domains; configuration is determined at reset (Mode C/B/A pins) or dynamically via software (SPORT/flag reconfiguration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2185LBST-210, the ADSP-2189MKSTZ-266 delivers 8× higher throughput in identical packaging but demands stricter power integrity, while the TMS320C549PGE offers broader third-party tool support at the cost of integrated serial features and on-chip emulation capability.

Availability

ADSP-2185LBST-210 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motor drives, professional audio equipment, and medical imaging systems requiring stable component supply and long-term obsolescence management.

Supply support for ADSP-2185LBST-210 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial applications.

The ADSP-21xx family-including ADSP-2185LBST-210-was engineered for real-time deterministic DSP tasks in resource-constrained embedded systems, emphasizing low-latency I/O, on-chip memory integration, and power-aware operation.

FAQ

What is the maximum operating frequency of the ADSP-2185LBST-210?

The ADSP-2185LBST-210 has a 30 ns instruction cycle time, corresponding to a 33.33 MHz instruction rate. It accepts a 16.67 MHz external clock or crystal input, which is doubled internally. This timing is production-validated and specified across commercial temperature range (0°C to +70°C) with 5 V ±10% supply.

Does the ADSP-2185LBST-210 support in-circuit debugging without removing the chip?

Yes, the ADSP-2185LBST-210 integrates on-chip ICE-Port™ emulation support with a dedicated 14-pin interface (9 pins implemented on TQFP). This allows full-speed, non-intrusive debugging-including breakpoints, register inspection, and memory read/write-while the ADSP-2185LBST-210 remains soldered in the target system.

Can the ADSP-2185LBST-210 boot directly from external memory?

Yes, the ADSP-2185LBST-210 supports automatic booting from byte-wide external memory (e.g., EPROM or Flash) into its on-chip program RAM. Boot mode is selected via Mode C pin state at reset, and the internal byte DMA controller handles the transfer transparently without CPU intervention.

How does the power-down mode of the ADSP-2185LBST-210 work in practice?

The ADSP-2185LBST-210 enters power-down either via assertion of the PWD pin or software setting of the power-down force bit. Upon entry, clocks halt except for oscillator stabilization circuitry, and PWDACK goes active. Recovery begins within 100 CLKIN cycles, resuming execution from the instruction following the power-down trigger.

Is the ADSP-2185LBST-210 pin-compatible with other ADSP-2100 family members?

The ADSP-2185LBST-210 uses the same 100-lead TQFP package and shares core signal definitions (SPORTs, memory buses, flags) with ADSP-2181/2186/2189, but differs in pin assignments for IDMA vs. full-memory mode and EZ-Port layout. Code is instruction-set compatible, but PCB layout requires verification against the specific variant's pinout table.