DS2450S+ - 16-Bit 1-Wire Quad ADC | Analog Devices
부품 번호: DS2450S+ ✗ 단종DS2450S+ 개요
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.
드롭인 대체품: DS2450S+ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: DS2450S+ (동일 폼 팩터 및 풋프린트) — 차이점: Input Voltage Range, Resolution, Active Power Consumption, Architecture, Conditional Search.
DS2450S
✅ 드롭인가격 문의
데이터시트 보기 →DS2450S+T&R
✅ 드롭인가격 문의
데이터시트 보기 →DS2450
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
DS2450S+TR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
DS2450S+ 최대 정격 & 전기적 특성
| 분해능 | 16 bit |
| Number of Input Channels | 4 |
| Architecture | Successive Approximation (SAR) |
| Digital Interface | 1-Wire (Dallas Semiconductor proprietary, single-wire bi-directional) |
| 입력 전압 범위 | 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 |
| 동작 온도 | -40 °C to +85 °C (industrial grade) |
| 패키지 | 8-pin SOIC (S) |
| 실장 유형 | Surface Mount |
DS2450S+ 핀 구성
| 핀 1 | DQ — 1-Wire data I/O and parasitic power input |
| 핀 2 | N.C. — Not connected (reserved) |
| 핀 3 | AIN0 — Analog input channel 0 |
| 핀 4 | AIN1 — Analog input channel 1 |
| 핀 5 | AIN2 — Analog input channel 2 |
| 핀 6 | AIN3 — Analog input channel 3 |
| 핀 7 | VCC — Optional external supply (2.8 V to 5.25 V); leave open for parasitic power |
| 핀 8 | GND — Ground |
일반적인 애플리케이션
DS2450S+ 적합 용도: 7 애플리케이션s: 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.
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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.
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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.
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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.
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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.
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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.
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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.
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추천 제품 요약
엔지니어링 참조 데이터: DS2450S+ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Single-wire-plus-ground interface with unique 64-bit ROM ID per device (vs DS2450S+T&R)
- Per-channel software-configurable range, resolution, and calibration (vs DS2450 (no S suffix))
- Conditional-search alarm function for threshold-only event reporting (vs DS2450S)
설계 노트
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.
규정 준수 정보
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.
