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Analog Devices Inc. ADSP-2185LBST-115
- Part No.:
- ADSP-2185LBST-115
- Manufacturer:
- Analog Devices Inc.
- Category:
- DSP (Digital Signal Processors)
- Package:
- 100-LQFP
- Datasheet:
-
ADSP-2185LBST-115.pdf
- Description:
- IC DSP CONTROLLER 16BIT 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:533
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Product details
Overview
ADSP-2185LBST-115 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 5-pin synchronous serial ports (SPORT0/SPORT1). It executes all instructions in a single 30 ns cycle, supports zero-overhead looping, and integrates power-down mode with 100-cycle recovery-used in real-time audio processing, telecom channel banks, and embedded control systems.
For engineers reviewing the ADSP-2185LBST-115 datasheet, ADSP-2185LBST-115 pinout, ADSP-2185LBST-115 application, or ADSP-2185LBST-115 equivalent, key selection criteria include instruction cycle time, on-chip memory configuration, serial port framing flexibility, power-down recovery latency, and TQFP-100 package compatibility with legacy ADSP-2100 family designs.
Technical Context
The ADSP-2185LBST-115 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 features two double-buffered serial ports with hardware companding (A-law/µ-law per CCITT G.711), programmable 16-bit interval timer with prescaler, 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- or hardware-initiated power-down with nonmaskable interrupt support and 100-cycle wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Instruction Cycle Time | 30 ns - enables 33 MIPS sustained throughput for real-time signal processing loops |
| On-Chip Program Memory | 16K × 24-bit RAM - stores both instructions and data, enabling dual-operand fetch per cycle |
| On-Chip Data Memory | 16K × 16-bit RAM - supports simultaneous data access for FFT, FIR, and filter coefficient storage |
| Serial Ports | 2 × bidirectional SPORTs - each with independent framing, 3–16-bit word length, and hardware A-law/µ-law companding |
| Power-Down Recovery | 100 CLKIN cycles - allows rapid resumption of real-time tasks after low-power sleep |
| Package | 100-lead TQFP - surface-mount compatible with industrial temperature range operation |
| Interrupt Sources | 11 total (6 external + 5 internal) - includes edge/level-configurable IRQ pins and nonmaskable power-down interrupt |
Pinout & Package
ADSP-2185LBST-115 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, flag I/O, and emulation domains; configuration is determined at RESET (mode pins) or via software (SPORT/flag reconfiguration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Processor Reset Input | Active-low asynchronous reset initiating full context initialization and mode pin sampling |
| CLKIN / XTAL | System Clock Input | Dual-function pin accepting either TTL clock (at half instruction rate) or parallel-resonant crystal |
| SPORT0[4:0] | Synchronous Serial Port 0 | 5-pin interface for frame-synchronized data transfer; supports autobuffering and multichannel TDM on SPORT0 |
| SPORT1[4:0] | Synchronous Serial Port 1 | Configurable as serial port or dual IRQ + FI/FO; enables multiprocessor communication or system signaling |
| PF0–PF7 | Programmable Flag I/O | 13 total flags (8 software-configurable I/O, 3 dedicated outputs, 2 shared with SPORT1) for custom handshaking or status indication |
| PWD / PWDACK | Power-Down Control | PWD initiates hardware power-down; PWDACK asserts when internal state is fully suspended and clocks gated |
| EZ-Port[8:0] | ICE-Port Emulation Interface | 9-pin JTAG-compatible debug interface enabling in-circuit emulation without target board modification |
Key Features
| Feature | Design Value |
|---|---|
| Single-Cycle Instruction Execution | Every instruction-including ALU, MAC, and shifter operations-completes in exactly one 30 ns cycle, eliminating pipeline stalls in deterministic real-time code |
| Dual Operand Fetch Architecture | Three-bus design permits simultaneous fetch of instruction, program-memory operand, and data-memory operand-enabling true VLIW-style parallelism |
| Zero-Overhead Looping | Hardware loop counters and stack eliminate branch instruction overhead, critical for tight FIR filter or FFT kernel execution |
| Byte DMA Port (BDMA) | Bidirectional 8-bit interface addressing up to 4 MB external memory for program overlays and data tables without CPU intervention |
| Internal DMA Port (IDMA) | 16-bit multiplexed address/data bus in Host Mode enabling direct, transparent access to on-chip RAM from external controllers or FPGAs |
Applications
| Voice Channel Processing | Industrial Motor Control |
|---|---|
Use Scenario: Real-time echo cancellation and DTMF detection in VoIP gateways using 8 kHz sampled audio streams. IC Role / Device Role / Timing Role: Primary DSP executing adaptive filtering algorithms with strict 125 µs frame timing bound. Use Value: 30 ns instruction cycle and zero-overhead looping ensure deterministic execution within 125 µs audio frame boundaries. | Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase AC induction motors in PLC-based drives. IC Role / Device Role / Timing Role: Real-time PWM waveform generation and current-loop feedback computation at 20 kHz switching frequency. Use Value: Dual SPORTs interface directly to isolated ADCs and PWM timers; on-chip RAM stores motor parameter lookup tables. |
| Telecom Line Card | Portable Medical Instrumentation |
Use Scenario: Multi-channel PCM framing and CAS/CCS signaling in T1/E1 line interface units. IC Role / Device Role / Timing Role: Synchronous serial processor handling 24/32-channel TDM streams via SPORT0 multichannel mode. Use Value: SPORT0's 24/32-word TDM capability eliminates external framing logic and reduces BOM count. | Use Scenario: Battery-powered ECG analyzer performing real-time QRS detection and ST-segment analysis. IC Role / Device Role / Timing Role: Low-power signal processor entering power-down between heartbeat intervals while retaining RAM context. Use Value: 100-cycle power-down recovery and software-controlled context save/restore enable sub-second response to cardiac events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-point DSP microcomputer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADSP-2189MKSTZ-120 | Higher speed grade (120 MHz core clock, 25 ns cycle); same 100-TQFP package and ADSP-2100 instruction set | Supports tighter real-time deadlines (e.g., 48 kHz audio with >2× processing headroom) but consumes ~20% more active power | Select when sustained 40+ MIPS throughput is required and thermal/power budget permits |
| TMS320C549PGE | TI C54x architecture; 100-MIPS peak, 16K × 16-bit RAM, 6LQFP-144 package; no native SPORT companding or ICE-Port | Requires external companding IC for G.711 compliance; lacks integrated emulation interface requiring XDS510-class debug hardware | Select when TI toolchain ecosystem or existing C54x firmware reuse is prioritized over analog front-end integration |
Compared with ADSP-2185LBST-115, ADSP-2189MKSTZ-120 delivers higher deterministic throughput at identical pinout and memory architecture, while TMS320C549PGE offers broader third-party tool support but requires external components for telecom-standard audio interfacing and adds debug infrastructure complexity.
Availability
ADSP-2185LBST-115 is available at Aetrix Electronics and suitable for voice channel processing, industrial motor control, telecom line card development, and portable medical instrumentation requiring stable component supply across extended product lifecycles.
Supply support for ADSP-2185LBST-115 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 company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing, signal conditioning, and real-time computation.
The ADSP-2185LBST-115 belongs to the ADSP-2100 family of fixed-point DSP microcomputers, designed specifically for cost-sensitive, low-power embedded signal processing applications where deterministic real-time performance and on-chip memory integration are critical.
FAQ
What clock source options does the ADSP-2185LBST-115 support?
The ADSP-2185LBST-115 accepts either a TTL-compatible external clock applied to CLKIN (at half the instruction rate, e.g., 16.67 MHz for 30 ns cycle) or a parallel-resonant fundamental-mode crystal connected across CLKIN and XTAL. Crystal operation supports automatic oscillator start-up stabilization with configurable wait states, and the external clock may remain active during power-down without affecting recovery latency. The ADSP-2185LBST-115 does not support PLL-based internal clock multiplication.
How does the ADSP-2185LBST-115 handle memory addressing in Full Memory Mode versus Host Mode?
In Full Memory Mode (Mode C = 0), the ADSP-2185LBST-115 exposes 14 address lines (A13–A0) and 24 data lines (D23–D0) for direct access to program, data, byte, and I/O spaces. In Host Mode (Mode C = 1), it operates as a peripheral with a 16-bit multiplexed IDMA bus (IAD15–IAD0), single A0 address line, and dedicated control signals (IWR, IRD, IAL, IS, IACK). Mode selection is latched only at RESET and cannot be changed dynamically during operation.
Can the ADSP-2185LBST-115's serial ports support simultaneous TDM and standard framed operation?
Yes-the ADSP-2185LBST-115's SPORT0 supports multichannel TDM (24- or 32-word bitstreams) independently of SPORT1, which can operate in standard framed or frameless mode. Each SPORT has separate transmit/receive frame sync generators, allowing SPORT0 to handle time-division multiplexed voice channels while SPORT1 manages control data or inter-processor messaging-all concurrently and with independent clock sources.
What is the role of the EZ-Port on the ADSP-2185LBST-115, and is it compatible with standard JTAG tools?
The EZ-Port on the ADSP-2185LBST-115 is Analog Devices' proprietary ICE-Port™ interface-a 9-pin debug port implementing boundary-scan and real-time trace capabilities. It is not electrically or protocol-compatible with standard IEEE 1149.1 JTAG tools; instead, it requires Analog Devices' EZ-ICE® emulator hardware and VisualDSP++ software. The interface enables non-intrusive in-circuit debugging, including breakpoint setting, register/memory inspection, and instruction-level emulation without removing the ADSP-2185LBST-115 from the target board.
Does the ADSP-2185LBST-115 support booting directly from external memory, and what interfaces are used?
Yes-the ADSP-2185LBST-115 supports automatic booting from external byte-wide memory (e.g., EPROM or Flash) via its Byte DMA (BDMA) port, or from external memory connected to the Internal DMA (IDMA) port in Host Mode. Boot sequence loads program code into on-chip program RAM; the processor begins execution at address 0x0000 after boot completion. No external boot ROM controller or glue logic is required-boot mode is determined by hardware strapping and internal configuration registers.
ADSP-2185LBST-115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADSP-21xx
- Package/Case:
- 100-LQFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Type:
- Fixed Point
- Interface:
- Host Interface, Serial Port
- Clock Rate:
- 28.8MHz
- Non-Volatile Memory:
- External
- On-Chip RAM:
- 80kB
- Voltage - I/O:
- 3.30V
- Voltage - Core:
- 3.30V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
ADSP-2185LBST-115 FAQ
1.How can I place an order for ADSP-2185LBST-115 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADSP-2185LBST-115 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADSP-2185LBST-115 reliable?
The price and inventory of ADSP-2185LBST-115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADSP-2185LBST-115 is usually 5 days.
3.What payment methods are accepted for ADSP-2185LBST-115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADSP-2185LBST-115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADSP-2185LBST-115?
ADSP-2185LBST-115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADSP-2185LBST-115 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADSP-2185LBST-115?
For technical support, including ADSP-2185LBST-115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADSP-2185LBST-115 requirements.
6.How does Aetrix verify that ADSP-2185LBST-115 is sourced from the original manufacturer or authorized distributors?
All ADSP-2185LBST-115 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADSP-2185LBST-115 meets industry standards.
7.What is the process for return or replacement of ADSP-2185LBST-115?
All ADSP-2185LBST-115 units undergo pre-shipment inspection (PSI). If there is an issue with ADSP-2185LBST-115, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADSP-2185LBST-115 part is unused and in its original packaging.
Return procedure for ADSP-2185LBST-115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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