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Analog Devices Inc. ADSP-2181KSTZ-115
- Part No.:
- ADSP-2181KSTZ-115
- Manufacturer:
- Analog Devices Inc.
- Category:
- DSP (Digital Signal Processors)
- Package:
- 128-LQFP
- Datasheet:
-
ADSP-2181KSTZ-115.pdf
- Description:
- IC DSP CONTROLLER 16BIT 128TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
ADSP-2181KSTZ-115 from Analog Devices is a 16-bit fixed-point DSP microcomputer optimized for real-time digital signal processing, featuring 40 MIPS sustained performance at 25 ns instruction cycle time, 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 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-2181KSTZ-115 datasheet, ADSP-2181KSTZ-115 pinout, ADSP-2181KSTZ-115 application, or ADSP-2181KSTZ-115 equivalent, key selection criteria include its 128-lead TQFP package, 20 MHz crystal-based clocking, power-down mode with 100-cycle recovery, ICE-Port™ emulator interface, and ADSP-2100 family instruction set compatibility with bit-manipulation extensions.
Technical Context
The ADSP-2181KSTZ-115 implements a three-bus Harvard architecture with independent ALU, MAC, and shifter computational units, enabling single-cycle execution of multifunction instructions that combine data moves and arithmetic operations. Its two dedicated DAGs support automatic modulo addressing for circular buffers, and the program sequencer delivers zero-overhead looping via internal loop counters and stacks.
It integrates a 16-bit internal DMA port (IDMA) for transparent access to on-chip memory, a byte DMA port supporting up to 4 MB external byte-wide memory, and dual serial ports with configurable framing, A-law/µ-law companding per CCITT G.711, and double-buffered transmit/receive sections - all operating concurrently with instruction execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Instruction Cycle Time | 25 ns at 20 MHz crystal input - 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 (one from PM, one from DM) per cycle. |
| On-Chip Data Memory | 16K × 16-bit RAM - used for variables, coefficients, and memory-mapped registers; supports simultaneous dual-operand access. |
| Serial Ports | Two independent SPORTs - each with programmable clock, frame sync, 3–16-bit word length, and hardware A-law/µ-law companding. |
| Power-Down Recovery | 100 CLKIN cycles - allows rapid resumption of execution after low-power dormancy, critical for battery-powered portable DSP systems. |
| Interrupt Support | 6 external + 5 internal interrupts - includes IRQ2 (edge/level), IRQL0/IRQL1 (level), IRQE (edge), SPORT/BDMA/timer sources, all individually maskable except power-down. |
| Package | 128-lead TQFP (14 mm × 14 mm, 0.4 mm pitch) - RoHS-compliant surface-mount package with thermal pad, specified for industrial temperature range. |
Pinout & Package
ADSP-2181KSTZ-115 is housed in a 128-lead Thin Quad Flat Package (TQFP) with exposed thermal pad, rated for –40°C to +85°C operation. Pin functions are defined per Analog Devices ADSP-2181 Rev. D datasheet.
| 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 interface. |
| DATA[23:0] | Data I/O | 24-bit bidirectional data bus; upper 8 bits also serve as byte-space address lines for BDMA port access. |
| SPORT0[4:0] | Serial Port 0 Interface | 5-pin synchronous serial interface (DT0, DR0, RFS0, TFS0, SCLK0) supporting framed/frameless modes and hardware companding. |
| SPORT1[4:0] | Serial Port 1 or Flag/IRQ | Configurable 5-pin interface: default serial I/O, or repurposed as IRQ0/IRQ1 inputs and FLAG_IN/FLAG_OUT signals. |
| IDMA[15:0] | Internal DMA Bus | 16-bit bidirectional address/data bus for high-speed transparent access to on-chip program and data RAM without external bus arbitration. |
| PWD / PWDACK | Power-Down Control | PWD is active-low input to enter hardware power-down; PWDACK is open-drain output confirming entry into low-power state. |
| ICE-Port Pins (EE, EBR, EBG, etc.) | Emulator Interface | 14 dedicated pins for EZ-ICE® debugging - function only during emulation; must connect exclusively to EZ-ICE connector, no pull resistors required. |
Key Features
| Feature | Design Value |
|---|---|
| Three-Bus Architecture | Enables concurrent program address generation, instruction fetch, dual data moves, pointer updates, and computation in one 25 ns cycle. |
| Dual Data Address Generators (DAGs) | Each maintains four post-modified address pointers with associated length registers - supports efficient circular buffer management for FFTs and FIR filters. |
| Zero-Overhead Looping | Hardware loop stack and counters eliminate branch penalties - critical for tight real-time control loops and sample-rate processing. |
| Byte DMA Port (BDMA) | Directly addresses up to 4 MB of external EPROM/ROM - enables seamless program overlays and coefficient table loading without CPU intervention. |
| ICE-Port™ Emulation | On-chip debug logic with 14-pin interface - supports in-target debugging, up to 20 breakpoints, and C source-level tracing without removing the ADSP-2181KSTZ-115 from the target board. |
Applications
| Audio Signal Processing | Telecom Channel Bank |
|---|---|
Use Scenario: Real-time stereo audio encoding/decoding in portable voice recorders using AD1847 SoundPort® codec interfaced via SPORT0. IC Role / Device Role / Timing Role: Primary DSP engine executing A-law/µ-law companding, filtering, and buffering - synchronized to 8 kHz sampling clock with sub-10 µs interrupt latency. Use Value: On-chip 16K × 24-bit program RAM eliminates external boot ROM; dual SPORTs enable full-duplex audio I/O without DMA overhead. | Use Scenario: Multi-channel PCM framing and echo cancellation in T1/E1 line cards with time-division multiplexed serial streams. IC Role / Device Role / Timing Role: Central signal processor handling 24/32-word TDM bitstreams on SPORT0, while SPORT1 manages control signaling and status reporting. Use Value: Hardware companding per CCITT G.711 reduces host CPU load; 40 MIPS throughput ensures real-time processing of 24+ channels at 64 kbps each. |
| Industrial Motor Control | Embedded Test Instrumentation |
Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase AC motors using analog feedback from ADCs and PWM outputs. IC Role / Device Role / Timing Role: Real-time computation engine performing Park/Clarke transforms, PI regulation, and space-vector modulation - executing control law in ≤5 µs per sample. Use Value: Single-cycle context switch and zero-overhead loops guarantee deterministic timing; 13 programmable flag pins directly drive gate drivers and monitor fault signals. | Use Scenario: Portable spectrum analyzer capturing and processing RF IF samples at 10 MS/s using external ADC/DAC and IDMA port transfers. IC Role / Device Role / Timing Role: High-speed data co-processor offloading FFT, windowing, and peak detection from host MCU - synchronized via IDMA handshaking signals. Use Value: 16-bit IDMA port provides 32 MB/s burst bandwidth to on-chip RAM; power-down mode extends battery life between measurement bursts. |
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-133 | Higher speed grade (133 MHz core, 7.5 ns cycle); same 128-TQFP package and ADSP-2100 instruction set; adds enhanced timer and extended flag I/O. | Required for applications needing >40 MIPS sustained throughput or tighter control loop timing (e.g., servo drives). | Select when higher clock rate and extended peripherals justify cost premium; software-compatible drop-in replacement for most ADSP-2181KSTZ-115 designs. |
| TMS320C549PGE | TI C54x architecture; 100 MIPS at 100 MHz; 32K × 16-bit on-chip RAM; different instruction set, memory map, and peripheral register layout. | Suitable for new designs prioritizing higher MIPS/Watt or TI toolchain integration; not software-compatible with ADSP-2181KSTZ-115. | Choose for greenfield projects where migration effort is acceptable and higher performance density is critical; requires full firmware rewrite and PCB layout review. |
Compared with ADSP-2181KSTZ-115, ADSP-2189MKSTZ-133 offers direct performance scaling within the same footprint and toolchain, while TMS320C549PGE provides superior raw throughput at the cost of complete architectural divergence and redesign effort.
Availability
ADSP-2181KSTZ-115 is available at Aetrix Electronics and suitable for audio signal processing, telecom infrastructure, industrial motor control, and embedded instrumentation requiring stable component supply across long-lifecycle programs.
Supply support for ADSP-2181KSTZ-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 sensing, signal conditioning, and real-time computation.
The ADSP-2181KSTZ-115 belongs to the ADSP-2100 family of fixed-point DSP microcomputers, designed specifically for cost-sensitive, low-power embedded systems demanding deterministic real-time response in audio, communications, and control applications.
FAQ
What clock source options does the ADSP-2181KSTZ-115 support?
The ADSP-2181KSTZ-115 accepts either a 20 MHz fundamental-mode parallel-resonant crystal across CLKIN/XTAL pins or a TTL-compatible 20 MHz external clock applied to CLKIN only (with XTAL left unconnected). The internal oscillator generates a 40 MHz instruction clock, resulting in a 25 ns instruction cycle time. CLKOUT can be enabled to provide this clock externally for system synchronization.
How does the ADSP-2181KSTZ-115 handle booting from external memory?
The ADSP-2181KSTZ-115 supports automatic booting from byte-wide external memory (e.g., EPROM) via its Byte DMA port when BMODE = 0 and MMAP = 0. During reset, it loads the first 32 words of program code into on-chip program RAM, then begins execution at address 0x0000. This eliminates need for external boot ROM in many configurations.
Can the ADSP-2181KSTZ-115's serial ports operate simultaneously with full-duplex audio I/O?
Yes - SPORT0 and SPORT1 operate independently and concurrently. Each port has separate double-buffered transmit and receive sections, programmable clocks, and framing logic. In audio applications, SPORT0 typically handles stereo I/O with AD1847 codec while SPORT1 manages control signaling or secondary audio streams - all without CPU intervention due to autobuffering.
What low-power modes are implemented in the ADSP-2181KSTZ-115?
The ADSP-2181KSTZ-115 features three low-power states: Power-Down (hardware/software-initiated, 100-cycle wake-up), Idle (CPU halted, clocks active, interrupt-wakeup), and Slow Idle (IDLE(n) instruction reduces internal clock by factor of 16/32/64/128). All modes retain on-chip RAM contents and support fast resume, making them ideal for battery-powered DSP systems.
Is the ADSP-2181KSTZ-115 pin-compatible with other ADSP-2100 family members?
The ADSP-2181KSTZ-115 shares the same 128-lead TQFP footprint and core signal mapping with ADSP-2189MKSTZ-133 and ADSP-2186MKSTZ-120, but differs in pin assignments for certain flags, timers, and emulator signals. While mechanical mounting is identical, full pin-to-pin compatibility requires verification against specific variant datasheets - especially for SPORT1 reconfiguration and ICE-Port pin usage.
ADSP-2181KSTZ-115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADSP-21xx
- Package/Case:
- 128-LQFP
- Packaging:
- Tray
- 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-2181KSTZ-115 FAQ
1.How can I place an order for ADSP-2181KSTZ-115 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADSP-2181KSTZ-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-2181KSTZ-115 reliable?
The price and inventory of ADSP-2181KSTZ-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-2181KSTZ-115 is usually 5 days.
3.What payment methods are accepted for ADSP-2181KSTZ-115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADSP-2181KSTZ-115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADSP-2181KSTZ-115?
ADSP-2181KSTZ-115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADSP-2181KSTZ-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-2181KSTZ-115?
For technical support, including ADSP-2181KSTZ-115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADSP-2181KSTZ-115 requirements.
6.How does Aetrix verify that ADSP-2181KSTZ-115 is sourced from the original manufacturer or authorized distributors?
All ADSP-2181KSTZ-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-2181KSTZ-115 meets industry standards.
7.What is the process for return or replacement of ADSP-2181KSTZ-115?
All ADSP-2181KSTZ-115 units undergo pre-shipment inspection (PSI). If there is an issue with ADSP-2181KSTZ-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-2181KSTZ-115 part is unused and in its original packaging.
Return procedure for ADSP-2181KSTZ-115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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