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Analog Devices Inc./Maxim Integrated DS2450S
- Part No.:
- DS2450S
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
DS2450S.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,826
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Product details
Overview
DS2450S from Maxim Integrated is a 1-Wire quad analog-to-digital converter with four high-impedance voltage inputs, 16-bit successive-approximation architecture, user-programmable input ranges (2.56V or 5.12V), resolution (1–16 bits), and alarm thresholds. It operates from a single 5V supply, consumes 2.5 mW active power, and supports multidrop 1-Wire bus operation in industrial sensor monitoring systems.
For engineers reviewing the DS2450S datasheet, DS2450S pinout, DS2450S application, or DS2450S equivalent, this device is selected for distributed voltage sensing where low-pin-count, parasitic-power-capable, self-identifying nodes are required - especially in temperature-compensated power rail monitoring, battery cell voltage tracking, and environmental sensor arrays with conditional event reporting.
Technical Context
The DS2450S implements a 4:1 analog multiplexer feeding a successive-approximation ADC, with each channel independently configurable for range, resolution, and dual-threshold alarms. Its memory-mapped register set (three 8-byte pages) stores conversion results, control/status bits (OE/OC, RC0–RC3, IR, AEH/AEL), and alarm thresholds - all accessible via standard 1-Wire ROM and memory function commands.
It supports both parasitic and VCC-powered operation: parasitic mode requires strong 5V pullup during A/D conversion, while VCC mode enables concurrent bus communication and eliminates conversion offset time when address 1Ch is written with 0x40. Conditional Search response is triggered only when AEH or AEL flags are enabled and measured voltage exceeds programmed thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Architecture | Successive-approximation with 4:1 analog multiplexer - enables per-channel independent configuration without external switching. |
| Input Channels | Four high-impedance analog inputs (AIN-A to AIN-D) - supports simultaneous multi-point voltage sensing on one 1-Wire node. |
| Resolution Range | Programmable 1–16 bits per channel - allows trade-off between speed (60–80 μs/bit + 160 μs offset) and precision. |
| Input Voltage Ranges | User-selectable 2.56V or 5.12V full-scale - matches common reference voltages without external scaling resistors. |
| 1-Wire Speed Modes | Standard (16.3 kbps) or Overdrive (142 kbps) - selectable via ROM command to optimize bus throughput in dense networks. |
| Power Supply | Single 4.5–5.5V VCC or parasitic power - enables deployment in space-constrained or cable-only installations. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded monitoring in uncontrolled environments. |
Pinout & Package
DS2450S is housed in an 8-pin SOIC (208 mil) surface-mount package with exposed pad not electrically connected. Power delivery and signal integrity are optimized for single-wire bidirectional communication with minimal external components.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Accepts 4.5–5.5V; enables VCC-powered operation and eliminates parasitic power timing constraints. |
| NC | No-connect terminal | Must remain unconnected; no internal connection - floating or tied to GND causes undefined behavior. |
| DATA | 1-Wire bidirectional data line | Open-drain interface requiring external 5kΩ pullup (standard) or 2.2kΩ (Overdrive); carries ROM, memory, and control commands. |
| GND | Ground reference | Common return for analog inputs, digital logic, and 1-Wire signaling - must be low-impedance for ADC accuracy. |
| AIN-A | Analog input channel A | High-impedance input configurable for 2.56V/5.12V range and 1–16-bit resolution; supports alarm threshold monitoring. |
| AIN-B | Analog input channel B | Independent of AIN-A; identical electrical specs and register mapping - enables differential or multi-rail sensing. |
| AIN-C | Analog input channel C | Same programmability as AIN-A/B; unused channels may be repurposed as open-drain digital outputs via OE/OC bits. |
| AIN-D | Analog input channel D | Final channel in 4-channel set; memory-mapped at highest addresses in page 0 - minimizes bus traffic when reading fewer channels. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-lasered 64-bit ROM | Unique 48-bit serial number + 8-bit family code (0x20) + 8-bit CRC - guarantees absolute node-level traceability in large-scale deployments. |
| Built-in 16-bit CRC generator | Hardware-accelerated CRC16 for all memory reads/writes - ensures end-to-end data integrity without host-side computation overhead. |
| Conditional Search support | Hardware-triggered response when any enabled channel crosses alarm thresholds - reduces polling load and enables event-driven system architecture. |
| Dual-mode channel usage | Each AIN pin configurable as analog input or open-drain digital output (via OE/OC bits) - supports closed-loop control without additional drivers. |
| VCC-powered optimization | Writing 0x40 to address 1Ch disables analog circuitry sleep mode - eliminates 160 μs conversion offset and enables concurrent bus activity. |
Applications
| Industrial Power Rail Monitoring | Battery Management Systems |
|---|---|
Use Scenario: Continuous voltage sampling across multiple DC rails (e.g., 3.3V, 5V, 12V) in PLC backplanes or motor drive cabinets. IC Role / Device Role / Timing Role: DS2450S acts as a self-identifying, multidrop ADC node that reports out-of-tolerance conditions via Conditional Search - eliminating periodic polling. Use Value: Reduces microcontroller I/O count and firmware complexity by consolidating four voltage measurements into one 1-Wire addressable device with hardware alarm flags. |
Use Scenario: Cell-level voltage tracking in 4-cell Li-ion battery packs deployed in portable medical devices or UPS units. IC Role / Device Role / Timing Role: DS2450S serves as a compact, low-power analog front-end per pack, delivering 12-bit resolution readings over shared 1-Wire bus with CRC-protected transfers. Use Value: Enables precise per-cell voltage comparison against programmable thresholds - triggering immediate host alert without waiting for full-cycle polling. |
| Environmental Sensor Arrays | Thermal Compensation Circuits |
Use Scenario: Distributed temperature-sensing nodes using thermistor voltage dividers across HVAC ducts or server racks. IC Role / Device Role / Timing Role: DS2450S digitizes thermistor divider outputs at each location, with unique ROM enabling automatic topology discovery during system boot. Use Value: Eliminates need for individual addressing jumpers or configuration EEPROMs - simplifies field deployment and firmware scalability. |
Use Scenario: Real-time compensation of oscillator drift or amplifier offset using thermistor and reference voltage feedback in precision instrumentation. IC Role / Device Role / Timing Role: DS2450S provides synchronized, calibrated voltage samples from multiple thermal sensors to feed host-based compensation algorithms. Use Value: Achieves <±0.5% full-scale accuracy over –40°C to +85°C without external calibration - reducing BOM cost and test time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad analog-to-digital converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11100 | Serial SPI interface, 16-bit SAR ADC, no built-in 1-Wire protocol or ROM ID - requires external microcontroller for addressing and bus arbitration. | Requires dedicated SPI lines and firmware-managed node enumeration - unsuitable for true multidrop or plug-and-play sensor networks. | Select MAX11100 only when higher sample rate (>100 kSPS) and SPI integration are prioritized over 1-Wire simplicity and node autonomy. |
| ADS1115 | I²C interface, 16-bit delta-sigma ADC, integrated PGA and comparator - lacks factory-programmed ROM, conditional search, or parasitic power capability. | Needs external I²C address configuration (jumpers or pins); no hardware event notification - relies on host polling for threshold breaches. | Choose ADS1115 when high-resolution DC measurements with programmable gain are needed, and I²C infrastructure already exists. |
Compared with MAX11100 and ADS1115, the DS2450S uniquely combines 1-Wire multidrop capability, factory-lasered ROM, hardware Conditional Search, and parasitic/VCC dual-power operation - making it the only option for self-identifying, event-driven, low-wire-count analog sensing in distributed industrial systems.
Availability
DS2450S is available at Aetrix Electronics and suitable for industrial power rail monitoring, battery management systems, environmental sensor arrays, and thermal compensation circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for DS2450S 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, automotive, and communications applications - emphasizing reliability, integration, and low-power operation.
The DS2450S belongs to Maxim's 1-Wire sensor and converter product line, engineered specifically for distributed, self-identifying measurement nodes in harsh or space-constrained environments where wiring simplicity and node autonomy are critical.
FAQ
What is the function of the NC pin on the DS2450S?
The NC (No Connect) pin on the DS2450S has no internal connection and must remain unconnected in the PCB layout. Tying it to GND, VCC, or any other net may cause undefined behavior or damage. This pin is reserved for future use or package compatibility and plays no role in DS2450S operation, power delivery, or 1-Wire signaling - its presence does not affect DS2450S functionality when left floating.
How does the DS2450S handle power during A/D conversion in parasitic mode?
In parasitic power mode, the DS2450S draws energy from the 1-Wire bus through the DATA line during high periods and stores it on an internal capacitor. During A/D conversion, the bus master must activate a strong 5V pullup for the entire conversion duration - calculated as (bits × 80 μs) + 160 μs offset - to supply sufficient current. Without this, DS2450S cannot complete conversion. The DS2450S itself does not regulate or switch this pullup; it is entirely controlled by the bus master's external circuitry.
Can unused analog input channels on the DS2450S be used as digital outputs?
Yes - any unused analog input channel (AIN-A through AIN-D) on the DS2450S can be reconfigured as an open-drain digital output. This is done by setting the OE (Output Enable) bit to 1 in the corresponding channel's control register (page 1), then controlling conduction state via the OC (Output Control) bit. When OC = 0, the transistor conducts (pulls low); when OC = 1, it remains off (high-impedance). This feature enables closed-loop control without adding discrete MOSFETs or drivers - and is fully supported in DS2450S operation.
What is the significance of the 64-bit ROM in the DS2450S?
The DS2450S contains a factory-lasered 64-bit ROM comprising an 8-bit family code (0x20), a unique 48-bit serial number, and an 8-bit CRC. This ROM enables absolute node identification, automatic topology discovery via Search ROM, and targeted communication using Match ROM - eliminating manual address assignment. No two DS2450S units share the same ROM, ensuring reliable multidrop operation even with hundreds of nodes on a single 1-Wire bus - a core capability of the DS2450S design.
Does the DS2450S support Overdrive mode, and how is it activated?
Yes, the DS2450S supports Overdrive mode, boosting 1-Wire communication speed from 16.3 kbps to 142 kbps. It is activated by issuing either the Overdrive-Skip ROM (0x3C) or Overdrive-Match ROM (0x69) command - both of which set the OD (Overdrive) flag to 1. After activation, all subsequent transactions must comply with Overdrive timing (e.g., 2.2kΩ pullup, reduced time slots). A standard reset pulse (≥480 μs) returns the DS2450S to regular speed. Overdrive mode is fully implemented in DS2450S silicon and documented in its functional command flow.
DS2450S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Serial
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
DS2450S FAQ
1.How can I place an order for DS2450S through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2450S 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 DS2450S reliable?
The price and inventory of DS2450S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2450S is usually 5 days.
3.What payment methods are accepted for DS2450S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2450S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2450S?
DS2450S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2450S 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 DS2450S?
For technical support, including DS2450S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2450S requirements.
6.How does Aetrix verify that DS2450S is sourced from the original manufacturer or authorized distributors?
All DS2450S 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 DS2450S meets industry standards.
7.What is the process for return or replacement of DS2450S?
All DS2450S units undergo pre-shipment inspection (PSI). If there is an issue with DS2450S, 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 DS2450S part is unused and in its original packaging.
Return procedure for DS2450S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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