DS2450S+ - 16-Bit 1-Wire Quad ADC | Analog Devices
料号： DS2450S+ ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.585 | $3.59 |
| 10 | $3.45 | $34.50 |
| 100 | $3.1 | $310.00 |
| 500 | $2.78 | $1,390.00 |
| 1,000 | $2.55 | $2,550.00 |
DS2450S+ 概述
What is a 1-Wire ADC? A 1-Wire ADC combines an analog-to-digital converter with the Maxim/Analog Devices 1-Wire protocol, which carries both power and bidirectional data on a single conductor (plus ground). In the broader component taxonomy, the DS2450 is an ADC -> data converter -> signal conditioning IC -> analog mixed-signal semiconductor. The 1-Wire family's defining feature is that every device has a unique 64-bit ROM ID, enabling multi-drop buses where the host microcontroller can identify and address individual nodes using only one GPIO pin - dramatically simplifying wiring in distributed sensor and identification applications.
Key specifications include 16-bit resolution, four analog input channels, software-selectable input ranges (0 to 5.12V, 0 to 2.56V, ±5.12V, ±2.56V when powered, plus 0 to 5.12V VCC-derived ranges when parasitically powered), per-channel 8-bit offset and 8-bit gain calibration, and 4 ms total conversion time for four 12-bit conversions in sequence. Configuration, calibration constants, and alarm thresholds are stored in on-chip SRAM that can be made non-volatile by an external EEPROM commit step.
The architecture combines an internal bandgap reference, a successive-approximation register driven by a self-contained clock, a four-channel analog multiplexer, and the 1-Wire protocol engine with 64-bit ROM ID. Because the device can be powered either from the 1-Wire bus (parasitic power) or from an external VCC, host systems can place the DS2450 at remote locations without running a dedicated power wire. The 1-Wire physical layer uses an open-drain pull-up with either internal or external strong pull-up to support A/D conversion currents.
Typical applications include remote analog sensing over a single data line (temperature, pressure, light, voltage monitoring at the edge of a 1-Wire network), building automation and HVAC sensor nodes, industrial control point-of-measurement, battery monitoring in distributed systems, and identification/condition monitoring of field equipment. The conditional-search feature lets the bus master detect channel over/under threshold events without polling every channel, a substantial bandwidth advantage on multi-drop buses.
When designing with the DS2450, remember that the 1-Wire bus requires a 4.7 kΩ pull-up to VCC and that parasite-powered operation demands a strong pull-up during the A/D conversion window. Decouple VCC with at least 100 nF close to the pin, keep analog input traces short, and use the read scratchpad / write scratchpad command sequence to commit calibration and alarm values to the device's non-volatile memory.
This page combines distributor pricing, drop-in alternatives, and practical design guidance beyond what the manufacturer datasheet alone provides, optimized for engineers evaluating the DS2450S+ for new designs and supply-chain recovery.
直接替换替代料： DS2450S+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： DS2450S+ （相同外形与封装尺寸） ——差异在于 Input Voltage Range, Resolution, Active Power Consumption, Architecture, Conditional Search.
快速对比工具——选择替代料号进行并排对比：
DS2450S
✅ 直接替换✓ 有现货
$4.1 / 个
查看数据手册 →DS2450S+T&R
✅ 直接替换✓ 有现货
$3.3 / 个
查看数据手册 →DS2450
✅ 直接替换📋 参考替代料（不在目录中）
DS2450S+TR
✅ 直接替换📋 参考替代料（不在目录中）
DS2450S+ 最大额定值与电气特性
| 分辨率 | 16 bit |
| Number of Input Channels | 4 |
| Architecture | Successive Approximation (SAR) |
| Digital Interface | 1-Wire (Dallas Semiconductor proprietary, single-wire bi-directional) |
| 输入电压范围 | 0 to 5.12 V / 0 to 2.56 V / ±5.12 V / ±2.56 V (software-selectable) |
| Conversion Time (per conversion, 12-bit) | 80 µs typical + 160 µs overhead per channel |
| ROM ID | 64-bit unique factory-lasered serial number |
| Per-channel Configuration | Voltage range, resolution, offset/gain calibration, alarm thresholds |
| Conditional Search | Per-channel over/under threshold flags supported |
| 工作温度 | -40 °C to +85 °C (industrial grade) |
| 封装 | 8-pin SOIC (S) |
| 安装类型 | Surface Mount |
DS2450S+ 引脚配置
| 引脚 1 | DQ — 1-Wire data I/O and parasitic power input |
| 引脚 2 | N.C. — Not connected (reserved) |
| 引脚 3 | AIN0 — Analog input channel 0 |
| 引脚 4 | AIN1 — Analog input channel 1 |
| 引脚 5 | AIN2 — Analog input channel 2 |
| 引脚 6 | AIN3 — Analog input channel 3 |
| 引脚 7 | VCC — Optional external supply (2.8 V to 5.25 V); leave open for parasitic power |
| 引脚 8 | GND — Ground |
典型应用
DS2450S+ 适用于 7 应用s: Remote 1-Wire Analog Sensing Network, Building Automation / HVAC Sensor Nodes, Distributed Battery / Voltage Monitoring, Industrial Control Point-of-Measurement, Identification / Condition Monitoring of Field Equipment, Smart Sensor / IoT Edge Node, Test and Measurement Instrumentation Front-End.
Remote 1-Wire Analog Sensing Network
The DS2450S+ excels in distributed analog sensor nodes connected via a single-wire 1-Wire bus where wiring simplicity outweighs bandwidth. Each device's 64-bit unique ROM ID lets the bus master address individual nodes on a multi-drop cable running hundreds of meters from the host. The four analog inputs accommodate temperature, light, pressure, or voltage signals with software-switchable 0 to 5.12 V / ±2.56 V ranges, while the 16-bit resolution delivers adequate dynamic range for industrial telemetry.
推荐
Building Automation / HVAC Sensor Nodes
In HVAC and building automation networks, the DS2450S+ lets each wall sensor, damper actuator, or rooftop unit report back four analog quantities (temperature, humidity via analog sensor, CO₂, setpoint) using a single wire. According to the manufacturer datasheet, the conditional-search alarm function flags any channel that crosses its programmed threshold so the central controller can interrupt only when an action is required, reducing bus traffic in large installations.
推荐
Distributed Battery / Voltage Monitoring
Battery stacks in telecom backup systems, solar arrays, or remote telemetry sites benefit from the DS2450S+ multi-channel 16-bit monitoring with built-in alarm flags. Place one DS2450S+ per battery shelf; the four inputs measure individual cell voltages, and the ±5.12 V range covers standard 12 V/24 V lead-acid strings when scaled through a resistor divider. The 1-Wire interface collapses all four measurements plus the host return path into a single twisted pair.
推荐
Industrial Control Point-of-Measurement
Plant-floor 4-20 mA loops and transducer bridges benefit from the DS2450S+ when wired as a field digitization node. Connect each analog channel to a 4-20 mA shunt resistor plus signal-conditioning front end and convert at the device under measurement, eliminating analog voltage drops across long cable runs. The 16-bit resolution resolves 4-20 mA spans to better than 1 µA at full scale.
推荐
Identification / Condition Monitoring of Field Equipment
Because the DS2450S+ carries a unique factory-lasered 64-bit ROM ID, the part doubles as both an identifier and a four-channel sensor for field-probe applications. Each monitored asset (pump, compressor, motor) gets an immutable serial number plus continuous analog telemetry across the same 1-Wire drop, simplifying asset tracking and remote diagnostics.
推荐
Smart Sensor / IoT Edge Node
IoT edge devices that need four analog readings on a single data line are well served by the DS2450S+; the device's parasitic-power option lets battery-form-factor nodes route only one signal wire back to the gateway MCU. Sleep-mode current, determined by the parasitic-power mode, is low enough for solar-cell energy harvesting designs. Combined with DS2482-100 I2C bridges at the gateway, a star of edge nodes can be aggregated over I2C into the main microcontroller.
推荐
Test and Measurement Instrumentation Front-End
Design test benches and bench-top instrumentation use the DS2450S+ to digitize four slow-changing process variables (voltage, current, resistance, temperature) on a single USB/serial-attached 1-Wire adapter. Each channel's 16-bit resolution and per-channel calibration registers let the same part serve multiple measurement functions; software selects range and offset/gain trim based on the active test.
推荐
推荐产品汇总
工程参考数据： DS2450S+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | DS2450S | DS2450S+T&R | DS2450 | DS2450S+TR |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC (S) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Channels | 4 | 4 | 4 | 4 | 4 |
| Digital Interface | 1-Wire | 1-Wire | 1-Wire | 1-Wire | 1-Wire |
| RoHS Status | RoHS compliant (+ suffix) | Unknown (original) | RoHS compliant | Unknown (original) | RoHS compliant |
| Packaging (stock code) | Tube cut-tape | Tube | Tape & Reel (2500 pcs) | Tube | Tape & Reel |
关键差异点
- Single-wire-plus-ground interface with unique 64-bit ROM ID per device （对比 DS2450S+T&R)
- Per-channel software-configurable range, resolution, and calibration （对比 DS2450 (no S suffix))
- Conditional-search alarm function for threshold-only event reporting （对比 DS2450S)
设计说明
Estimated: 1-Wire bus masters must enable a 'strong pull-up' on the DQ line during A/D conversion (typical 80 µs per 12-bit conversion, scales by 16-bit × N channels). Forgetting to drive the strong pull-up causes analog section undervoltage and noisy conversions when the DS2450S+ operates in parasitic-power mode. Always provision the host-side strong-pull-up circuit.
Estimated: when VCC is supplied, place a 100 nF decoupling capacitor as close as possible to VCC pin 7 with the ground loop minimized. Analog inputs should be routed as short a trace as practical and guarded by a ground ring or coplanar shield to prevent digital DQ-line transients (which can have 1-Wire edges of 4-15 V/µs) from coupling into the analog front end. If using the ±5.12 V range, ensure analog input grounds remain within 0.3 V of the GND pin during conversion.
Make sure to issue the 'Convert' command with matching resolution setting - mixing a 12-bit conversion command with 16-bit configuration registers can yield truncated data. After power-up the device asserts a power-on-reset flag in the status register, and conversion data read before issuing the 'Read Power-on Flag' reset will return invalid bytes. Use the conditional-search feature rather than polling to detect threshold crossings efficiently on multi-drop buses.
The 1-Wire physical layer is open-drain; use a 4.7 kΩ pull-up resistor on the DQ line to a 5 V supply, matching the typical DS2480/DS2482 bridge expectations. When the cable is long (over ~10 m), reduce the pull-up to 2.2 kΩ to maintain rise-time compliance with the Maxim 1-Wire timing spec (15 µs max rise time). At conversion time, expect aggregate bus dwell time of 4 × 80 µs (16-bit) ≈ 320 µs per measurement + overhead - factor this into your application polling budget.
合规信息
RoHS and lead-free indicated by the + suffix per Maxim/Analog Devices nomenclature per DS2450S+ listing on DigiKey and Mouser as of 2026-10-13. AEC-Q100 qualification not sought - this part is industrial/consumer, not automotive.
