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Analog Devices Inc. ADSP-2181KST-115
- Part No.:
- ADSP-2181KST-115
- Manufacturer:
- Analog Devices Inc.
- Category:
- DSP (Digital Signal Processors)
- Package:
- 128-LQFP
- Datasheet:
-
ADSP-2181KST-115.pdf
- Description:
- IC DSP CONTROLLER 16BIT 128TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,332
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Product details
Overview
ADSP-2181KST-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, dual serial ports (SPORT0/SPORT1), and a 16-bit internal DMA port. It serves as the core processor in audio codecs, telecom channel banks, and embedded control systems requiring deterministic low-latency computation.
For engineers reviewing the ADSP-2181KST-115 datasheet, ADSP-2181KST-115 pinout, ADSP-2181KST-115 application, or ADSP-2181KST-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-2181KST-115 implements the ADSP-2100 family base architecture with three independent computational units-ALU, MAC (40-bit accumulator), and barrel shifter-enabling simultaneous arithmetic, multiply-accumulate, and bit-shift operations per cycle. Its dual 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 via five internal buses (PMA, PMD, DMA, DMD, R), a 16-bit internal DMA port (IDMA) for transparent on-chip memory access, byte DMA port supporting up to 4 MB external byte memory, and programmable wait-state generation for glueless peripheral integration. Serial communication uses two double-buffered SPORTs with hardware A-law/µ-law companding per CCITT G.711.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Instruction Cycle Time | 25 ns at 20 MHz crystal - enables deterministic 40 MIPS sustained throughput with single-cycle instruction execution. |
| On-Chip Program Memory | 16K × 24-bit RAM - stores both instructions and data; supports dual operand fetch (instruction + data) in one cycle. |
| On-Chip Data Memory | 16K × 16-bit RAM - dedicated space for variables and memory-mapped registers; supports simultaneous dual-operand access with program memory. |
| Serial Ports | Two double-buffered SPORTs - each supports 3–16-bit word lengths, hardware companding (A-law/µ-law), and frame sync flexibility for telecom/audio framing. |
| Power-Down Recovery | 100 CLKIN cycles - allows rapid wake-up from ultra-low-power dormant state while preserving context or enabling clean restart. |
| Interrupt Support | 6 external interrupts (configurable edge/level-sensitive) + 7 internal sources - prioritized, maskable IRQ handling with 12-level nested stack for real-time response. |
| Package | 128-lead TQFP - surface-mount footprint compatible with high-density PCB layouts; thermal performance validated for industrial ambient conditions. |
Pinout & Package
ADSP-2181KST-115 is housed in a 128-lead Thin Quad Flat Package (TQFP) with 0.4 mm lead pitch, designed for reflow soldering and industrial temperature operation (–40°C to +85°C). Pin functions are electrically and mechanically identical to the 128-lead PQFP variant, differing only in package profile and thermal characteristics.
| 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; shared with external memory expansion. |
| DATA[23:0] | Data I/O | 24-bit bidirectional data bus; upper 8 bits double as byte-space addresses for EPROM boot loading and overlay access. |
| SPORT0[4:0] | Serial Port 0 Interface | 5-pin synchronous serial interface supporting TFS0/RFS0/DT0/DR0/SCLK0 - configurable for framed/frameless, master/slave operation. |
| SPORT1[4:0] | Serial Port 1 or Flag/IRQ | 5-pin multifunction interface: default serial I/O, or reconfigurable as IRQ0/IRQ1/FLAG_IN/FLAG_OUT for system signaling. |
| IDMA[15:0] | Internal DMA Address/Data | 16-bit multiplexed address/data bus for direct, high-speed access to on-chip RAM - eliminates external bus arbitration overhead. |
| PWD / PWDACK | Power-Down Control | PWD is active-low input to initiate hardware power-down; PWDACK is open-drain output confirming entry into low-power state. |
Key Features
| Feature | Design Value |
|---|---|
| Three-Unit Parallel Architecture | ALU, MAC, and shifter operate concurrently per cycle - enables true single-cycle MAC+ALU+shift (e.g., FIR filter tap update with normalization). |
| Dual DAGs with Modulo Addressing | Each DAG maintains four post-modified pointers with length registers - supports zero-overhead circular buffering for FFT, convolution, and delay-line applications. |
| ICE-Port™ Emulator Interface | 14-pin dedicated debug port - enables non-intrusive in-circuit emulation, breakpoint insertion, and register/memory inspection without removing ADSP-2181KST-115 from target board. |
| Boot-from-Byte-Memory | Automatic loading of on-chip program RAM from external 8-bit EPROM - eliminates need for external PROM programmer during production programming. |
| Programmable Slow Idle Mode | IDLE(n) instruction with n = 16/32/64/128 - scales internal clock to reduce power while maintaining full functionality and interrupt responsiveness within defined latency bounds. |
Applications
| Audio Signal Processing | Telecom Channel Bank |
|---|---|
Use Scenario: Real-time stereo audio codec with echo cancellation and noise suppression in VoIP endpoint devices. IC Role / Device Role / Timing Role: Primary DSP engine executing AD1847 SoundPort®-controlled audio I/O, performing 128-tap FIR filtering and adaptive LMS algorithms in <100 µs latency. Use Value: On-chip 16K×24-bit program RAM stores optimized assembly kernels; dual SPORTs handle full-duplex 16-bit PCM streams at 48 kHz with hardware companding. | Use Scenario: Multi-channel T1/E1 line card processing 24 voice channels with CAS/CCS signaling and transcoding. IC Role / Device Role / Timing Role: Channelized DSP coprocessor managing time-slot assignment, A-law/µ-law conversion, and HDLC framing per channel. Use Value: Two independent SPORTs enable simultaneous TDM stream handling; 16-bit IDMA port offloads channel data to external FIFOs without CPU intervention. |
| Industrial Motor Control | Embedded Test Instrumentation |
Use Scenario: Closed-loop servo drive with field-oriented control (FOC), current sensing, and PWM generation. IC Role / Device Role / Timing Role: Real-time controller executing Clarke/Park transforms, PI current regulators, and space-vector modulation at 20 kHz switching frequency. Use Value: 40 MIPS sustained throughput ensures sub-microsecond loop timing; programmable timer generates precise PWM dead-time and synchronization pulses. | Use Scenario: Portable spectrum analyzer capturing and processing RF IF samples at 10 MS/s with real-time FFT and peak detection. IC Role / Device Role / Timing Role: High-speed data acquisition and spectral analysis engine interfacing to ADC via byte DMA and computing 1024-point FFTs in hardware-accelerated loops. Use Value: Dual DAGs enable ping-pong buffer management for continuous sample streaming; on-chip data RAM holds FFT twiddle tables and intermediate results. |
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-115 | Enhanced version with 32K × 24-bit program RAM, 32K × 16-bit data RAM, and extended instruction set including bit-manipulation opcodes. | Supports larger algorithm footprints (e.g., wideband acoustic echo cancellation) and higher memory bandwidth via upgraded IDMA controller. | Select when >16K program memory or new ALU constants/bit-test instructions are required; pin-compatible but requires updated boot loader. |
| TMS320C549PGE | TI C54x-series 16-bit DSP with 16K × 16-bit RAM, 40-bit ALU/MAC, and different instruction encoding; no native ICE-Port, uses JTAG instead. | Lacks integrated byte DMA and SPORT companding hardware; requires external logic for EPROM boot and µ-law conversion. | Choose for legacy C54x toolchain compatibility or where TI's Code Composer Studio ecosystem is mandated; not pin- or code-compatible. |
Compared with ADSP-2181KST-115, ADSP-2189MKSTZ-115 offers doubled on-chip memory and enhanced instructions for complex algorithms, while TMS320C549PGE provides alternative toolchain support but demands external circuitry for boot and audio interfaces - neither is a drop-in replacement.
Availability
ADSP-2181KST-115 is available at Aetrix Electronics and suitable for audio codec design, telecom infrastructure development, and industrial motor control applications requiring stable component supply across long-lifecycle embedded programs.
Supply support for ADSP-2181KST-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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial systems.
The ADSP-21xx family-including ADSP-2181KST-115-is engineered for deterministic real-time signal processing in resource-constrained embedded environments, emphasizing low-latency I/O, on-chip memory efficiency, and debuggability in final systems.
FAQ
What clock source options does the ADSP-2181KST-115 support?
The ADSP-2181KST-115 accepts either a 20 MHz fundamental-mode quartz crystal across CLKIN/XTAL pins or a TTL-compatible 20 MHz external clock applied to CLKIN (with XTAL left unconnected). The internal oscillator automatically configures for crystal startup stabilization (4096 cycles) or immediate 100-cycle power-down recovery, ensuring reliable timing across power modes. No PLL is used-the instruction rate is derived directly from the input clock.
How does the ADSP-2181KST-115 handle boot loading from external memory?
The ADSP-2181KST-115 supports automatic boot loading from 8-bit byte-wide EPROM via its byte DMA port when BMODE = 0 and MMAP = 0. During reset, it fetches the first instruction from external memory location 0x0000, then copies the boot image into on-chip program RAM. This process requires no host processor intervention and is fully managed by on-chip boot ROM firmware embedded in ADSP-2181KST-115.
Can the ADSP-2181KST-115's SPORT1 pins be repurposed for general I/O?
Yes-SPORT1's five pins (SCLK1, RFS1, TFS1, DT1, DR1) can be reconfigured as two external interrupt inputs (IRQ0, IRQ1), one flag input (FLAG_IN), and one flag output (FLAG_OUT), freeing PF7:0 for other uses. This configuration is controlled by the SPORT1 Control Register and does not affect SPORT0 operation or internal timer functionality in ADSP-2181KST-115.
What is the maximum external memory capacity supported by the ADSP-2181KST-115?
The ADSP-2181KST-115 supports up to 4 MByte of external byte memory via its byte DMA port for program overlays and data tables, plus 2048 locations of I/O memory space for peripheral interfacing. External program/data overlays are limited to two 8K segments (0x2000–0x3FFF) using the PMOVLAY register; no external program memory beyond overlays is directly addressable.
Does the ADSP-2181KST-115 include hardware support for floating-point arithmetic?
No-the ADSP-2181KST-115 is a fixed-point DSP with 16-bit data paths, 24-bit program memory addressing, and a 40-bit accumulator in the MAC unit. Floating-point operations must be implemented in software using Q-format arithmetic or runtime libraries; there is no dedicated floating-point unit or IEEE-754 hardware in ADSP-2181KST-115.
ADSP-2181KST-115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADSP-21xx
- Package/Case:
- 128-LQFP
- 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-TQFP (14x20)
ADSP-2181KST-115 FAQ
1.How can I place an order for ADSP-2181KST-115 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADSP-2181KST-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-2181KST-115 reliable?
The price and inventory of ADSP-2181KST-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-2181KST-115 is usually 5 days.
3.What payment methods are accepted for ADSP-2181KST-115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADSP-2181KST-115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADSP-2181KST-115?
ADSP-2181KST-115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADSP-2181KST-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-2181KST-115?
For technical support, including ADSP-2181KST-115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADSP-2181KST-115 requirements.
6.How does Aetrix verify that ADSP-2181KST-115 is sourced from the original manufacturer or authorized distributors?
All ADSP-2181KST-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-2181KST-115 meets industry standards.
7.What is the process for return or replacement of ADSP-2181KST-115?
All ADSP-2181KST-115 units undergo pre-shipment inspection (PSI). If there is an issue with ADSP-2181KST-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-2181KST-115 part is unused and in its original packaging.
Return procedure for ADSP-2181KST-115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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