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Analog Devices Inc. ADSP-2181KS-115
- Part No.:
- ADSP-2181KS-115
- Manufacturer:
- Analog Devices Inc.
- Category:
- DSP (Digital Signal Processors)
- Package:
- 128-BFQFP
- Datasheet:
-
ADSP-2181KS-115.pdf
- Description:
- IC DSP CONTROLLER 16BIT 128PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:251
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Product details
Overview
ADSP-2181KS-115 from Analog Devices is a 16-bit fixed-point DSP microcomputer optimized for real-time digital signal processing, featuring a 25 ns instruction cycle time (40 MIPS sustained), 16K × 24-bit on-chip program RAM, 16K × 16-bit on-chip data RAM, and dual synchronous serial ports (SPORT0/SPORT1) with hardware companding. It targets audio processing, telecom channel banks, and embedded control systems requiring deterministic low-latency execution.
For engineers reviewing the ADSP-2181KS-115 datasheet, ADSP-2181KS-115 pinout, ADSP-2181KS-115 application, or ADSP-2181KS-115 equivalent, key selection criteria include its 128-lead TQFP package, 20 MHz crystal-based clocking, zero-overhead looping architecture, power-down mode with 100-cycle recovery, and ICE-Port™ emulator interface for in-system debugging.
Technical Context
The ADSP-2181KS-115 implements the ADSP-2100 family base architecture with three independent computational units-ALU, 40-bit MAC, and barrel shifter-interconnected via a dedicated result (R) bus to enable multi-operation parallelism per cycle. Its two DAGs support automatic modulo addressing for circular buffers, and the program sequencer delivers zero-overhead loops and conditional execution without pipeline stalls.
System interfacing is enabled through five internal buses (PMA, PMD, DMA, DMD, R), a 16-bit internal DMA port for transparent on-chip memory access, an 8-bit byte DMA port supporting up to 4 MByte external storage, and programmable wait-state generation for glueless peripheral integration. Serial communication uses two double-buffered SPORTs compliant with CCITT G.711 A-law/µ-law companding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Instruction Cycle Time | 25 ns at 5.0 V, enabling 40 MIPS sustained throughput with single-cycle instruction execution. |
| On-Chip Program Memory | 16K × 24-bit RAM, configurable for both instructions and data, allowing dual-operand fetch per cycle. |
| On-Chip Data Memory | 16K × 16-bit RAM, supporting simultaneous data access and memory-mapped register control. |
| Serial Ports | Two independent SPORTs with hardware companding, frame sync flexibility, and 3–16-bit word length support. |
| Power-Down Recovery | Resumes execution in ≤100 CLKIN cycles, with nonmaskable power-down interrupt and context save/restore control. |
| Timer | 16-bit programmable interval timer with 8-bit prescaler (TSCALE), generating periodic interrupts with reload from TPERIOD. |
| Interrupt Support | Six external interrupts (configurable edge/level-sensitive) plus seven internal sources, all individually maskable except power-down and reset. |
Pinout & Package
ADSP-2181KS-115 is housed in a 128-lead TQFP (Thin Quad Flat Package) with 0.4 mm lead pitch, thermally enhanced for industrial temperature operation and compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADDR[13:0] | Address Output | 14-bit multiplexed address bus for program, data, byte, and I/O memory spaces. |
| DATA[23:0] | Data I/O | 24-bit bidirectional data bus; upper 8 bits double as byte-space address lines. |
| SPORT0[4:0] | Serial Port 0 Interface | Five pins for transmit/receive clock, frame sync, data I/O, and companding control. |
| SPORT1[4:0] | Serial Port 1 or IRQ/Flag Interface | Configurable as second serial port or dual IRQ inputs + flag in/out signals. |
| IDMA[15:0] | Internal DMA Address/Data Bus | 16-bit multiplexed bus for high-speed direct access to on-chip program and data RAM. |
| PWD / PWDACK | Power-Down Control | Active-low input initiates low-power dormant state; output acknowledges entry into power-down mode. |
| CLKIN / XTAL | Clock Input | Dual-pin interface for 20 MHz crystal (across CLKIN–XTAL) or TTL-compatible half-rate clock signal. |
| RESET | Master Reset Input | Asynchronous active-low signal initializing stacks, masking interrupts, clearing MSTAT, and triggering boot sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Three-Bus Architecture | Enables simultaneous dual operand fetch (one from program memory, one from data memory) in every instruction cycle. |
| Zero-Overhead Looping | Eliminates branch penalty via hardware loop counters and stack, allowing infinite repetition without instruction overhead. |
| ICE-Port™ Emulator Interface | 14-pin dedicated debug port supporting in-circuit emulation, breakpoint setting, register/memory inspection, and C-source debugging without target board modification. |
| Bit Manipulation Instructions | Includes bit set/clear/toggle/test operations, enabling efficient bit-field control in protocol stacks and peripheral drivers. |
| Flexible Interrupt Prioritization | Eleven maskable interrupts with fixed priority order and vector addresses; power-down and reset are nonmaskable. |
Applications
| Audio Signal Processing | Telecom Channel Bank |
|---|---|
Use Scenario: Real-time stereo audio filtering, echo cancellation, and compression on portable sound cards or VoIP endpoints. IC Role / Device Role / Timing Role: Primary DSP engine executing FIR/IIR filters and G.711 companding in deterministic sub-millisecond latency. Use Value: Dual SPORTs handle full-duplex 16-bit stereo streams concurrently while on-chip RAM eliminates external memory bottlenecks. | Use Scenario: Multi-channel T1/E1 line card processing 24–30 voice channels with PCM framing and CAS signaling. IC Role / Device Role / Timing Role: Central signal processor managing time-division multiplexed serial data, buffer management, and channel-specific gain control. Use Value: SPORT0's multichannel mode receives/transmits 24–32-word bitstreams; 40 MIPS throughput supports >30 concurrent G.711 encode/decode paths. |
| Industrial Motor Control | Embedded Test Instrumentation |
Use Scenario: Closed-loop servo control in CNC drives using position feedback, PWM generation, and real-time PID computation. IC Role / Device Role / Timing Role: Real-time controller executing position-loop calculations and updating PWM duty cycles within strict jitter constraints. Use Value: Single-cycle context switch and deterministic 25 ns instruction timing ensure <1 µs jitter on critical control outputs. | Use Scenario: Portable spectrum analyzer front-end performing FFT-based frequency analysis on sensor data streams. IC Role / Device Role / Timing Role: High-speed numeric coprocessor offloading FFT, windowing, and magnitude calculation from host MCU. Use Value: 40-bit MAC accumulator prevents overflow in 1024-point FFTs; 80 KB on-chip RAM stores coefficients and intermediate results without external DRAM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DSP microcomputer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADSP-2189MKSTZ-120 | Higher speed grade (120 MHz instruction rate), same 128-lead TQFP package, identical instruction set and memory map. | Supports higher sample rates in audio codecs and faster FFTs in test equipment; requires tighter timing margins on external memory interfaces. | Select when >40 MIPS sustained performance is required and system clock budget allows 24 MHz crystal or 48 MHz external clock. |
| TMS320C549PGE | TI C54x-family 16-bit DSP; 100 MIPS peak, different instruction set, 32K × 16-bit RAM, 6-level pipeline vs. ADSP-2181KS-115's 3-bus Harvard architecture. | Better suited for large-scale algorithmic workloads (e.g., multi-band equalizers); lacks native G.711 companding and ICE-Port™ debug interface. | Choose for legacy C54x toolchain compatibility or when higher raw MIPS outweighs need for zero-overhead loops and integrated serial peripherals. |
Compared with ADSP-2181KS-115, ADSP-2189MKSTZ-120 offers higher throughput in the same footprint but demands stricter layout for clock integrity, while TMS320C549PGE provides greater raw compute density at the cost of architectural divergence and no hardware companding-making ADSP-2181KS-115 optimal for compact, low-jitter, telecom-grade embedded DSP designs.
Availability
ADSP-2181KS-115 is available at Aetrix Electronics and suitable for audio signal processing, telecom channel bank implementations, and industrial motor control systems requiring stable component supply across extended product lifecycles.
Supply support for ADSP-2181KS-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The ADSP-2181KS-115 belongs to the ADSP-2100 family of fixed-point DSP microcomputers designed specifically for real-time embedded signal processing where deterministic timing, low power, and integrated peripherals reduce system complexity and bill-of-materials cost.
FAQ
What clock source options does the ADSP-2181KS-115 support?
The ADSP-2181KS-115 accepts either a 20 MHz fundamental-mode quartz crystal connected across CLKIN and XTAL pins, or a TTL-compatible 20 MHz clock signal applied to CLKIN only (with XTAL left unconnected). The internal oscillator circuit automatically configures for crystal startup, including 4096-cycle stabilization wait, or bypasses it for external clock operation-ensuring reliable boot in both configurations. This flexibility is built into the ADSP-2181KS-115's clock generation logic.
How does the ADSP-2181KS-115 handle program memory overlays?
The ADSP-2181KS-115 supports two 8K-word external program memory overlays using the PMOVLAY register and A13 address bit, enabling dynamic code swapping without modifying the core instruction stream. Overlay selection occurs during external memory access cycles, but the processor sequencer does not track overlay state-so interrupt service routines must manually save/restore PMOVLAY to prevent corruption. This overlay mechanism is integral to the ADSP-2181KS-115's memory architecture.
Can the ADSP-2181KS-115's SPORT1 be used simultaneously as a serial port and interrupt source?
No-SPORT1 on the ADSP-2181KS-115 is functionally multiplexed: it operates either as a full synchronous serial port (with SCLK1, RFS1, TFS1, DT1, DR1) or as two external interrupt inputs (IRQ0, IRQ1) plus Flag In and Flag Out signals. Configuration is static at power-up via the BMODE pin and cannot be dynamically reconfigured during runtime. This dual-role capability is a defined feature of the ADSP-2181KS-115 pin mapping.
What is the role of the IDMA port in the ADSP-2181KS-115?
The 16-bit Internal DMA (IDMA) port on the ADSP-2181KS-115 provides direct, transparent access to on-chip program and data RAM without CPU intervention, enabling high-speed data transfers between the DSP core and external logic (e.g., FPGAs or ADC/DAC controllers). It uses multiplexed address/data lines (IAD[15:0]) with dedicated control signals (IRD, IWR, IS, IAL, IACK) and operates independently of the external memory bus-preserving bandwidth for instruction fetches and other operations. This port is a core system interface feature of the ADSP-2181KS-115.
Does the ADSP-2181KS-115 support C-language development?
Yes-the ADSP-2181KS-115 is fully supported by Analog Devices' ADSP-2100 Family Development Tools, including a GNU-based C compiler that generates optimized assembly code targeting the ADSP-2181KS-115's instruction set. The runtime library provides over 100 ANSI-standard and DSP-specific functions (e.g., FFT, FIR, math), and the source-level debugger enables step-through debugging of C code mapped directly to ADSP-2181KS-115 hardware registers and memory.
ADSP-2181KS-115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADSP-21xx
- Package/Case:
- 128-BFQFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Type:
- Fixed Point
- Interface:
- Synchronous Serial Port (SSP)
- Clock Rate:
- 28.8MHz
- Non-Volatile Memory:
- External
- On-Chip RAM:
- 80kB
- Voltage - I/O:
- 5.00V
- Voltage - Core:
- 5.00V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 128-MQFP (14x20)
ADSP-2181KS-115 FAQ
1.How can I place an order for ADSP-2181KS-115 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADSP-2181KS-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-2181KS-115 reliable?
The price and inventory of ADSP-2181KS-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-2181KS-115 is usually 5 days.
3.What payment methods are accepted for ADSP-2181KS-115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADSP-2181KS-115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADSP-2181KS-115?
ADSP-2181KS-115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADSP-2181KS-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-2181KS-115?
For technical support, including ADSP-2181KS-115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADSP-2181KS-115 requirements.
6.How does Aetrix verify that ADSP-2181KS-115 is sourced from the original manufacturer or authorized distributors?
All ADSP-2181KS-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-2181KS-115 meets industry standards.
7.What is the process for return or replacement of ADSP-2181KS-115?
All ADSP-2181KS-115 units undergo pre-shipment inspection (PSI). If there is an issue with ADSP-2181KS-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-2181KS-115 part is unused and in its original packaging.
Return procedure for ADSP-2181KS-115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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