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Analog Devices Inc. ADSP-21MOD880-000
- Part No.:
- ADSP-21MOD880-000
- Manufacturer:
- Analog Devices Inc.
- Category:
- DSP (Digital Signal Processors)
- Package:
- -
- Datasheet:
-
ADSP-21MOD880-000.pdf
- Description:
- 2181KST 4 MODEM CHIPSET
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Product details
Overview
ADSP-21MOD880-000 from Analog Devices is a single-chip Internet gateway processor optimized for V.34/V.90 data/fax modem implementation, integrating 32K × 24-bit program RAM, 32K × 16-bit data RAM, dual synchronous serial ports (SPORT0/SPORT1), and ADSP-2100 base architecture with MAC/ALU/shifter computational units. It delivers 52 MIPS sustained performance at 19 ns instruction cycle time and operates at 3.3 V with typical 80 mW digital modem power dissipation.
For engineers reviewing the ADSP-21MOD880-000 datasheet, ADSP-21MOD880-000 pinout, ADSP-21MOD880-000 application, or ADSP-21MOD880-000 equivalent, key selection criteria include on-chip memory configuration (160 KB total RAM), IDMA/BDMA interface support, low-power operation modes (Power-Down, Idle, Slow Idle), and integrated modem datapump + controller functionality without external memory.
Technical Context
The ADSP-21MOD880-000 implements a fixed-function V.34/V.90 modem datapump and controller within an ADSP-2100-compatible DSP core, featuring zero-overhead looping, dual DAGs, and three independent computational units (ALU, MAC, shifter) operating on 16-bit data with 40-bit MAC accumulation. Its architecture supports simultaneous dual-operand fetches from program and data memory in one cycle.
It provides two double-buffered serial ports with hardware A-law/μ-law companding per CCITT G.711, programmable 16-bit interval timer with prescaler, 13 programmable flag pins (8 I/O, 3 output-only), and ICE-Port™ emulator interface for in-system debugging. Memory interface supports Full Memory Mode (14-bit address, 24-bit data) or Host Mode (16-bit multiplexed IDMA bus).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ADSP-2100 family base with instruction set extensions for modem control and datapump |
| Instruction Cycle Time | 19 ns @ 3.3 V - enables 52 MIPS sustained throughput for real-time V.90 symbol processing |
| On-Chip Memory | 32K × 24-bit program RAM + 32K × 16-bit data RAM = 160 KB total SRAM - eliminates need for external memory in modem applications |
| Serial Interfaces | Two SPORTs (SPORT0, SPORT1) with hardware companding, frame sync flexibility, and multichannel mode (24/32-channel on SPORT0) |
| Power Dissipation | 80 mW typical in digital modem operation - enables high-density modem card designs with thermal margin |
| Package | 100-lead LQFP, 0.4 in² (256 mm²) footprint - compatible with standard surface-mount assembly processes |
| Low-Power Modes | Power-Down (400-cycle wake-up), Idle, and Slow Idle (16×–128× clock divisor) - supports battery-powered or energy-constrained gateway deployments |
Pinout & Package
The ADSP-21MOD880-000 is housed in a 100-lead LQFP package with multiplexed functionality across serial port, flag, interrupt, and memory interface pins. Pin configuration is determined at RESET (Mode C/A/B/D) and during runtime (SPORT software configuration). Unused pins require specific termination per Analog Devices' guidelines (e.g., IRQx/PFx pulled high if used as inputs, IACK open-drain handling in Host Mode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Processor reset input | Active-low asynchronous reset initiating full internal state initialization and mode sampling |
| CLKIN / XTAL | System clock source input | Accepts crystal (1–20 MHz) or TTL/CMOS clock; oscillator disable supported in Power-Down mode |
| SPORT0 (TFS0/RFS0/DT0/DR0/SCLK0) | Synchronous serial interface #0 | Full-duplex, double-buffered port supporting V.34/V.90 line signaling and T1/E1 PCM framing |
| SPORT1 (TFS1/RFS1/DT1/DR1/SCLK1) | Synchronous serial interface #1 | Configurable as second serial port or repurposed for IRQ0/IRQ1/Flag In/Flag Out in modem host coordination |
| IAD15:0 / IWR / IRD / IAL / IS / IACK | 16-bit IDMA port signals | Host Mode interface enabling transparent access to on-chip RAM without external address/data bus demultiplexing |
| PWD / PWDACK | Power-down control | PWD initiates hardware power-down; PWDACK asserts when internal clocks are gated and device enters standby |
| EZ-Port (9-pin) | ICE-Port™ emulator interface | Enables non-intrusive in-circuit emulation, breakpoint insertion, and register/memory inspection without target board modification |
Key Features
| Feature | Design Value |
|---|---|
| V.34/V.90 Modem Integration | Complete datapump + controller firmware runs entirely from on-chip SRAM - no external memory required for certified modem operation |
| Dual SPORT Hardware Companding | A-law and μ-law companding per CCITT G.711 implemented in dedicated logic - offloads CPU cycles from audio codec processing |
| Zero-Overhead Looping | Hardware loop counters and stack eliminate branch instructions in inner loops - critical for deterministic V.90 symbol rate timing |
| 16-Bit IDMA Port | Direct 16-bit parallel access to on-chip program/data RAM from host processor - enables dynamic firmware updates and statistics retrieval |
| Programmable Flag Pins | 13 configurable flags (8 bidirectional, 3 output-only) provide hardware handshake signals for modem status, DTR/DSR, and line control without GPIO expansion |
Applications
| DSL/Cable Modem Gateway | V.90 Fax/Data Terminal |
|---|---|
Use Scenario: Embedded residential gateway aggregating analog POTS lines into broadband IP uplink via DSL or cable infrastructure. IC Role / Device Role / Timing Role: Primary modem datapump and AT command interpreter executing V.34/V.90 line negotiation, echo cancellation, and trellis coding in real time. Use Value: 160 KB on-chip RAM enables full modem stack execution without external memory latency, reducing BOM cost and PCB area by >30% versus discrete controller + datapump solutions. | Use Scenario: Standalone fax/data terminal connecting legacy office equipment to PSTN with V.90 fallback and error correction. IC Role / Device Role / Timing Role: Self-contained modem engine handling call setup, modulation/demodulation, and host interface (ISA/PCI) via IDMA port. Use Value: Dual SPORTs with hardware companding support simultaneous voiceband data and fax transmission - eliminating need for external codec ICs. |
| T1/E1 Channel Bank Interface | Industrial Remote Access Unit |
Use Scenario: T1 channel bank providing 24-channel modem pooling for remote site connectivity over digital telco lines. IC Role / Device Role / Timing Role: One of multiple ADSP-21MOD880-000 devices synchronized to T1 frame clock, each handling dedicated DS0 channel modem functions. Use Value: SPORT0 multichannel mode (24/32-word TDM) directly interfaces to T1 framer ICs - simplifies timing alignment and reduces external glue logic. | Use Scenario: Ruggedized remote telemetry unit deploying over PSTN for SCADA data collection in oil/gas or utility infrastructure. IC Role / Device Role / Timing Role: Low-power modem subsystem entering Power-Down between polling intervals, waking on ring detect or scheduled call. Use Value: 80 mW typical power and 400-cycle wake-up from Power-Down enable >1-year battery life in intermittent-use deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Internet gateway processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADSP-21MOD870 | Identical architecture, memory map, and pinout; differs only in minor mask revision and factory-programmed boot code | Same V.34/V.90 modem functionality and reference design compatibility | Select ADSP-21MOD870 only if legacy design validation or documentation references that specific part number |
| ADSP-21065L | SHARC-based, 40-bit floating-point, 100MIPS peak, 256K × 48-bit on-chip RAM - no integrated modem firmware or SPORT companding | Requires external modem firmware development and codec ICs; suited for custom VoIP or wideband signal processing | Choose ADSP-21065L only when migrating to floating-point algorithms or requiring >52 MIPS sustained throughput beyond V.90 constraints |
Compared with ADSP-21MOD880-000, ADSP-21MOD870 offers identical modem functionality with no design changes required, while ADSP-21065L provides higher raw compute but demands full modem stack development and external analog front-end components.
Availability
ADSP-21MOD880-000 is available at Aetrix Electronics and suitable for DSL/cable gateway integration, T1 channel bank deployment, and industrial remote access units requiring stable component supply and long-term lifecycle support.
Supply support for ADSP-21MOD880-000 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 leader in high-performance analog, mixed-signal, and DSP technology, serving industrial, communications, automotive, and consumer markets since 1965.
The ADSP-21MOD880-000 belongs to the ADSP-2100 family Internet gateway processor line, designed specifically to integrate V.34/V.90 modem datapump and controller functions into a single low-power, memory-self-sufficient chip for cost-sensitive broadband edge devices.
FAQ
What is the primary function of the ADSP-21MOD880-000 in modem systems?
The ADSP-21MOD880-000 serves as a complete single-chip V.34/V.90 data/fax modem engine, integrating both the datapump (modulation/demodulation, echo cancellation, trellis coding) and controller (AT command parsing, error correction, compression) functions. All modem software executes from its 160 KB of on-chip SRAM, eliminating external memory requirements and enabling compact, low-power modem designs. The ADSP-21MOD880-000 is not a general-purpose DSP but a purpose-built Internet gateway processor.
Does the ADSP-21MOD880-000 support external memory expansion?
The ADSP-21MOD880-000 supports external memory expansion only in Full Memory Mode, where it exposes 14 address lines (A13:A0) and 24 data lines (D23:D0) for program, data, byte, and I/O spaces. However, its 160 KB on-chip RAM is sufficient to run the full V.34/V.90 modem stack, and Analog Devices explicitly positions the ADSP-21MOD880-000 as a "no external memory required" solution. External memory is optional and typically used only for non-modem firmware overlays or logging buffers.
How does the ADSP-21MOD880-000 handle low-power operation in battery-powered applications?
The ADSP-21MOD880-000 provides three hardware-supported low-power states: Power-Down (400-cycle wake-up, lowest current), Idle (clock-gated, interrupt-responsive), and Slow Idle (programmable 16×–128× clock divisor). Power-Down is initiated via the PWD pin or software bit and acknowledged by PWDACK. These modes enable <100 µA standby current and make the ADSP-21MOD880-000 suitable for portable or solar-powered remote telemetry units where duty-cycled modem operation is required.
Can the ADSP-21MOD880-000 be used for voice-over-IP (VoIP) applications?
Yes - the ADSP-21MOD880-000's open architecture and SRAM-based firmware execution path support VoIP extension beyond V.34/V.90. Its dual SPORTs with hardware A-law/μ-law companding directly interface to PCM streams, and the 52 MIPS sustained performance accommodates G.723.1 or G.729A codecs. However, VoIP functionality requires separate firmware development; the factory-loaded modem software does not include VoIP stacks. The ADSP-21MOD880-000 is qualified as an "extensible platform" for such applications per Analog Devices' documentation.
What debug and development tools are supported for the ADSP-21MOD880-000?
The ADSP-21MOD880-000 is fully supported by Analog Devices' ADSP-2100 Family Development Tools, including VisualDSP++ IDE, C compiler, assembler, simulator, and EZ-ICE® emulator via its dedicated 14-pin ICE-Port™ interface. The ADSP-21MOD880-000-EV1 evaluation kit provides a working reference design with four ADSP-21MOD880-000 devices, SHARC host processor, and T1 interface. Modem software is delivered as object code, and development targets the ADSP-2100 instruction set with algebraic syntax.
ADSP-21MOD880-000 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Interface:
- -
- Clock Rate:
- -
- Non-Volatile Memory:
- -
- On-Chip RAM:
- -
- Voltage - I/O:
- -
- Voltage - Core:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ADSP-21MOD880-000 FAQ
1.How can I place an order for ADSP-21MOD880-000 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADSP-21MOD880-000 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-21MOD880-000 reliable?
The price and inventory of ADSP-21MOD880-000 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADSP-21MOD880-000 is usually 5 days.
3.What payment methods are accepted for ADSP-21MOD880-000?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADSP-21MOD880-000 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADSP-21MOD880-000?
ADSP-21MOD880-000 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADSP-21MOD880-000 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-21MOD880-000?
For technical support, including ADSP-21MOD880-000 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADSP-21MOD880-000 requirements.
6.How does Aetrix verify that ADSP-21MOD880-000 is sourced from the original manufacturer or authorized distributors?
All ADSP-21MOD880-000 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-21MOD880-000 meets industry standards.
7.What is the process for return or replacement of ADSP-21MOD880-000?
All ADSP-21MOD880-000 units undergo pre-shipment inspection (PSI). If there is an issue with ADSP-21MOD880-000, 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-21MOD880-000 part is unused and in its original packaging.
Return procedure for ADSP-21MOD880-000:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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