DS2450S+T&R - Quad 1-Wire 16-Bit ADC | Analog Devices
MPN: DS2450S+T&R ✗ End of LifeDS2450S+T&R Overview
The DS2450 is the most widely deployed ADC in the Maxim 1-Wire converter family. A 1-Wire ADC is a converter whose digital serial interface uses a single data line (plus ground) defined by Dallas Semiconductor (now part of Analog Devices), enabling multiple devices to share a common bus with unique 64-bit ROM IDs. The DS2450 is therefore typically used in applications where a small number of analog signals must be read remotely with minimum wiring, replacing parallel ADCs that would otherwise require several dedicated I/O lines or an SPI/I2C bus.
Key features include four analog inputs with switchable input ranges (2.56 V and 5.12 V full scale), 1 to 16 bits of programmable resolution (with conversion time scaling accordingly), per-channel high/low alarm thresholds with conditional-search support, and on-chip SRAM that retains user settings while VCC or the 1-Wire data line is powered. A built-in multidrop controller allows multiple DS2450s to be identified and operated on a common 1-Wire bus, and each device responds to the 1-Wire Conditional Search command when an alarm condition is met.
The DS2450 uses a successive-approximation register (SAR) architecture with a capacitive-charge redistribution DAC, achieving 16-bit resolution with no pipeline latency. Power-on reset and a power-on reset flag signal the bus master to restore the device settings stored in SRAM after supply or parasite-power interruptions, ensuring deterministic behavior in noisy industrial environments.
Typical applications include remote temperature and analog voltage monitoring over long cable runs, building-automation sensors, industrial process monitoring (4-20 mA loop digitization), environmental monitoring stations, HVAC sensor networks, and any distributed measurement node where minimizing wiring is critical. Each ADC is uniquely addressable on the bus, simplifying node inventory and remote firmware updates.
When designing with the DS2450, ensure the 1-Wire bus is properly terminated per Maxim application guidance, with a 4.7 kohm pull-up to VCC (typically 5 V) on the DQ line. Strong pull-up during conversion timeouts is recommended for parasite-powered nodes. Note that the DS2450 is in NRND (Not Recommended for New Designs) status per the manufacturer lifecycle policy - design engineers should verify long-term availability or consider migration paths for new designs.
This page synthesizes distributor pricing, lifecycle status, drop-in alternatives and practical design guidance not consolidated in the manufacturer datasheet, providing an actionable summary for procurement and design engineers.
Drop-in alternatives for DS2450S+T&R — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with DS2450S+T&R (same form factor and footprint) — differing in Input Voltage Range, Resolution, Active Power Consumption, Architecture, Conditional Search.
DS2450S+
✅ Drop-InContact for price
View Datasheet →DS2450S
✅ Drop-InContact for price
View Datasheet →DS2450S/T&R
✅ Drop-In📋 Reference alternative (not in catalog)
DS2450S+T&R Maximum Ratings & Electrical Characteristics
| Product Type | Analog-to-Digital Converter (ADC) |
| Architecture | Successive Approximation Register (SAR) |
| Resolution | 1 to 16 bits (user-programmable) |
| Number of Analog Input Channels | 4 |
| Input Voltage Range | 0 V to 2.56 V or 0 V to 5.12 V (user-programmable, single-ended) |
| Digital Interface | Maxim 1-Wire (single data line + ground) |
| Number of 1-Wire Devices on Bus | Multiple (64-bit unique ROM ID per device) |
| Supply Voltage | 5 V single supply |
| Active Power Consumption | 2.5 mW (typical, during conversion) |
| Idle Power Consumption | 25 uW (typical) |
| Operating Temperature Grade | Industrial |
| Package / Pin Count | 8-pin SOIC (S) |
| Terminal Form | Gull Wing |
| Package Shape | Rectangular |
| Delivery Form (T&R) | Tape and Reel |
| RoHS Status | Compliant |
| Built-in Multidrop Controller | Yes (1-Wire) |
| Conditional Search / Alarm Support | Yes (per-channel high/low thresholds) |
| On-chip Settings Memory | SRAM (volatile, retained while VCC or parasite-power present) |
DS2450S+T&R Pin Configuration
| Pin 1 | VCC — +5 V supply input (powers ADC core and SRAM) |
| Pin 2 | AIN0 — Analog input channel 0 (high-impedance, range programmable) |
| Pin 3 | AIN1 — Analog input channel 1 (high-impedance, range programmable) |
| Pin 4 | AIN2 — Analog input channel 2 (high-impedance, range programmable) |
| Pin 5 | AIN3 — Analog input channel 3 (high-impedance, range programmable) |
| Pin 6 | GND — Ground reference for VCC and analog inputs |
| Pin 7 | DQ — 1-Wire data line (open-drain, requires external pull-up to VCC) |
| Pin 8 | NC — Not connected (per datasheet) |
Typical Applications
DS2450S+T&R is suitable for 7 applications: Remote Industrial Sensor Monitoring, Building Automation / HVAC, Environmental Monitoring Stations, Portable / Battery-Powered Measurement, Medical Monitoring Equipment, Automotive Sensor Networks, Smart Agriculture Sensor Nodes.
Remote Industrial Sensor Monitoring
The DS2450S+T&R's 1-Wire multidrop interface enables long-cable analog voltage monitoring across industrial plants, with up to several hundred meters of bus length on a single twisted pair. Its four high-impedance input channels connect directly to 4-20 mA loop shunts or 0-10 V process signals, with user-selectable 2.56 V or 5.12 V full-scale ranges and programmable 1-16 bit resolution matching sensor accuracy. The on-chip multidrop controller and 64-bit ROM ID allow hundreds of DS2450 nodes on a common bus - eliminating dedicated ADC wiring and reducing PLC I/O cost.
Recommended
Building Automation / HVAC
Building automation systems use the DS2450S+T&R to digitize temperature, humidity, CO2 and pressure sensor outputs at remote locations with minimum wiring - only one data line plus ground is needed per cluster of sensors. Its 2.5 mW active and 25 uW idle power consumption support parasite-powered nodes over the 1-Wire bus, simplifying rooftop unit and air-handler retrofits. Per-channel alarm thresholds with conditional-search wake-up let the controller poll only out-of-range sensors, reducing bus traffic in large commercial HVAC installations.
Recommended
Environmental Monitoring Stations
Weather stations and remote environmental data loggers deploy the DS2450S+T&R to digitize solar radiation, soil moisture, wind speed and battery voltage over a 1-Wire backhaul. The 8-pin SOIC footprint fits inside sealed IP67 enclosures alongside solar charge controllers, and the 25 uW idle current extends battery life between transmissions. Four channels per node scale naturally to multi-parameter monitoring, while the 64-bit ROM ID supports per-node cryptographic identification in unattended deployments.
Recommended
Portable / Battery-Powered Measurement
Handheld multimeters and portable calibration tools leverage the DS2450S+T&R's 2.5 mW active power consumption and 5 V single-supply operation to extend battery life during long field sessions. Four input channels cover voltage, current-shunt, thermistor and reference measurements in one IC, replacing multiple discrete ADCs. The 1-Wire interface allows a single USB-1-Wire bridge dongle to handle both calibration data upload and ADC readings, simplifying the user interface for technicians in the field.
Recommended
Medical Monitoring Equipment
Patient monitoring peripherals and bench-top medical instrumentation use the DS2450S+T&R to digitize low-level analog signals from sensors over a 1-Wire isolation barrier, simplifying patient-side wiring for safety-critical designs. The four input channels handle ECG lead-off detection, temperature, SpO2 photodiode current and battery monitoring in compact bedside devices. The 1-Wire multidrop capability also supports per-patient disposable sensor identification, which is critical for inventory tracking in hospital environments.
Recommended
Automotive Sensor Networks
Distributed vehicle sensor networks benefit from the DS2450S+T&R's 1-Wire multidrop and per-node ROM ID for unique identification of wheel-speed, temperature and pressure sensors in body and chassis systems. The industrial operating temperature grade tolerates under-hood environments, and the four analog inputs consolidate multiple sensor types on one chip per node. Because the device is NRND, automotive OEMs should validate long-term supply or migrate to CAN/LIN-based ADCs for next-generation designs.
Recommended
Smart Agriculture Sensor Nodes
Greenhouse and precision agriculture deployments use the DS2450S+T&R to digitize soil-moisture probes, leaf-wetness sensors and ambient-light levels over a long 1-Wire bus running through the cultivation area. The four-channel integration reduces per-node BOM cost, while the 25 uW idle power allows solar-powered nodes to operate year-round without battery replacement. The multidrop 1-Wire controller supports hundreds of nodes per master, simplifying large-acreage deployment.
Recommended
Recommended Products Summary
Engineering reference data for DS2450S+T&R — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DS2450S+ | DS2450S | DS2450S/T&R |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Architecture | SAR (16-bit max) | SAR (16-bit max) | SAR (16-bit max) | SAR (16-bit max) |
| Number of Analog Input Channels | 4 | 4 | 4 | 4 |
| Resolution | 1 to 16 bits (programmable) | 1 to 16 bits (programmable) | 1 to 16 bits (programmable) | 1 to 16 bits (programmable) |
| Input Voltage Range | 0-2.56 V or 0-5.12 V | 0-2.56 V or 0-5.12 V | 0-2.56 V or 0-5.12 V | 0-2.56 V or 0-5.12 V |
| Digital Interface | 1-Wire (DQ + GND) | 1-Wire | 1-Wire | 1-Wire |
| Supply Voltage | 5 V single supply | 5 V | 5 V | 5 V |
| Lifecycle Status | NRND | NRND | NRND | NRND |
Key Differentiators
- Unique 1-Wire quad-channel ADC with multidrop and conditional-search support (vs DS2450S+)
- Programmable 1-16 bit resolution allows designers to trade conversion time for resolution (vs DS2450S/T&R (alternate slash-notation labeling))
- Tape-and-reel format optimized for high-volume SMT assembly (vs DS2450S+)
Design Notes
The DS2450S+T&R requires a 4.7 kohm pull-up resistor on the DQ line to VCC (typically 5 V) per the Maxim 1-Wire bus specification. Without proper pull-up the 1-Wire communication will fail intermittently, especially during long cable runs. For parasite-powered nodes (no local VCC), the master must provide a strong pull-up during ADC conversion timeouts per the datasheet, otherwise conversion accuracy will degrade.
Place the 4.7 kohm DQ pull-up as close as possible to the master 1-Wire bus driver rather than near each DS2450, since multiple slaves share the same bus. Add a 100 nF decoupling capacitor directly across VCC (pin 1) and GND (pin 6) of each DS2450 to suppress supply noise. Keep analog input traces short and away from DQ switching edges to minimize coupling into the ADC measurement. A ground plane under the analog inputs is recommended for low-noise single-ended measurements.
The 1-Wire bus is sensitive to cable capacitance; total round-trip cable length should not exceed approximately 300 m at standard pull-up values, per Maxim application guidance. Use twisted-pair cable (DQ + GND) for long runs and avoid running the 1-Wire bus parallel to noise sources like AC mains or motor drivers. For very long cable runs consider a lower pull-up value (e.g. 2.2 kohm) and reduce conversion-clock rate to improve signal rise time.
The DS2450S+T&R's 25 uW idle current allows parasite-powered operation, but active conversion power of 2.5 mW at 5 V (500 uA) requires either local VCC or a strong pull-up from the master during conversion. Estimated: total energy budget for one 16-bit conversion is roughly 2.5 mW * conversion_time. When designing battery-powered nodes, account for this conversion energy and size the local reservoir capacitor accordingly.
Compliance Information
RoHS compliance and lead-free status confirmed by distributor listing (Vyrian/Partstack). REACH, halogen-free and conflict-minerals status not stated in the verified distributor data - mark as unknown. AEC-Q100 not applicable since this is an industrial-grade ADC, not automotive-qualified per datasheet.
