MCP3903T-I/SS - 6-Channel 24-Bit AFE | Microchip
部品番号: MCP3903T-I/SS ✓ 生産中MCP3903T-I/SS 概要
An analog front end is the precision signal-conditioning and conversion stage between physical sensors or power-system inputs and a digital controller. The MCP3903 belongs to the hierarchy of energy-metering AFE, delta-sigma ADC, data converter, and integrated circuit. Its multi-channel architecture reduces the number of separate converters required when measuring several voltages and currents from a three-phase system.
Key features include six synchronous-sampling delta-sigma ADCs, selectable 16-bit or 24-bit operation, a proprietary multi-bit converter architecture, programmable gain amplifiers, and a phase-delay compensation block. The manufacturer specifies 91 dB SINAD and -100 dBc total harmonic distortion. These characteristics are particularly useful when the converter must resolve small AC signals while rejecting harmonic content and nonlinear distortion.
The MCP3903 contains three pairs formed from two synchronous-sampling delta-sigma converters. Internal dithering reduces idle tones and improves total harmonic distortion, which supports accurate measurements in metering systems operating with relatively low analog signal levels. The phase-delay compensation block helps align voltage and current measurements, while the internal reference simplifies analog subsystem design and the 10 MHz SPI-compatible interface supports high-speed digital communication with a meter controller.
Typical applications include three-phase electricity meters, residential and industrial energy monitoring, power-factor measurement, load-current analysis, and multichannel industrial sensing. Six channels allow a meter design to acquire three voltage signals and three current signals without deploying three unrelated converter subsystems. The same architecture can also support precision power monitoring in automated equipment.
A critical design consideration is analog signal conditioning. The input network, current shunt, voltage divider, filtering, and reference connections must preserve the converter's specified dynamic performance and avoid exceeding the analog and digital supply limits. PCB layout should keep sensitive input traces short, isolate them from switching nodes, and provide low-impedance supply connections to minimize measurement error.
This product page combines the manufacturer's electrical specifications, package information, pin-compatible family alternatives, application guidance, and PCB-level implementation notes to support faster component selection and first-pass design review.
ドロップイン代替品: MCP3903T-I/SS — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MCP3903T-I/SS （同一形状・フットプリント） — 相違点: ADC Architecture, Package, ADC Resolution, Serial Interface, SINAD.
MCP3903T-E/SS
✅ ドロップイン価格はお問い合わせください
データシートを見る →MCP3903T-I/SS 最大定格＆電気的特性
| Device Type | Six-channel analog front end |
| Number of ADC Channels | 6 channels |
| ADC Architecture | Synchronous-sampling delta-sigma |
| Converter Pair Arrangement | 3 pairs |
| ADC Resolution | 16-bit or 24-bit |
| Signal-to-Noise and Distortion | 91 dB SINAD |
| Total Harmonic Distortion | -100 dBc |
| Programmable Gain Amplifier | Present |
| Phase Delay Compensation | Present |
| Internal Voltage Reference | Present |
| Serial Interface | SPI-compatible, 10 MHz |
| Dithering | Proprietary algorithm for reduced idle tones |
| Digital Supply Voltage | 2.7 V to 3.6 V |
| Analog Supply Voltage | 4.5 V to 5.5 V |
| パッケージ | 28-SSOP, 0.209 in (5.30 mm) width |
| 実装タイプ | Surface mount |
| Shipping Package | Reel, TR |
| Export Control Classification | EAR99 |
MCP3903T-I/SS reel, tr ピン配置ガイド
MCP3903T-I/SS (reel, tr パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: MCP3903T-I/SS.
詳細は データシート をご参照ください。
主な用途
MCP3903T-I/SS の用途: 6 件s: Three-Phase Smart Electricity Meter, Residential Energy Monitor, Industrial Power-Factor Monitoring, Load-Balance and Demand Controller, Multichannel Industrial Sensor Interface, Power-Supply and Inverter Monitoring.
Three-Phase Smart Electricity Meter
The MCP3903T-I/SS fits a three-phase smart meter because six synchronous-sampling channels can acquire three voltage signals and three current signals in one converter package. Its 24-bit mode and 91 dB SINAD specification support accurate energy calculations, while phase-delay compensation helps align voltage and current waveforms. The internal reference, programmable gain amplifiers, and proprietary dithering simplify analog calibration and reduce idle-tone effects. Designers should still provide precision dividers, shunts, anti-alias filtering, and reinforced isolation appropriate to the meter voltage class.
おすすめ
Residential Energy Monitor
A residential energy monitor can use the MCP3903T-I/SS to acquire several load-current channels and voltage channels for real-time power reporting. Six inputs reduce the converter count compared with separate single-channel ADCs, and the 16/24-bit selectable resolution permits an application to balance measurement precision against processing and data rate. The 10 MHz SPI-compatible interface supports communication with a metering microcontroller. Accurate results still depend on shunt selection, PCB temperature stability, input filtering, and calibration of each measurement path.
おすすめ
Industrial Power-Factor Monitoring
The MCP3903T-I/SS is appropriate for industrial power-factor and power-quality monitoring because it can sample voltage and current channels synchronously and provide 24-bit resolution with 91 dB SINAD. Phase-delay compensation supports time-aligned measurements used in real and reactive power calculations. Its six-channel organization allows one device to cover a three-phase system. High-voltage installations require appropriately rated external dividers, isolated signal paths, surge protection, and safety-compliant board spacing around the analog input network.
おすすめ
Load-Balance and Demand Controller
The MCP3903T-I/SS can provide the measurement front end for industrial load-balancing equipment that must monitor several branch currents and bus voltages. Six channels reduce synchronization and component-count challenges, while the internal reference and programmable gain amplifiers support consistent acquisition across different input ranges. The controller can derive real power, apparent power, and imbalance information from the sampled waveforms. Firmware must account for converter latency, phase alignment, calibration coefficients, and the phase-delay compensation behavior described in the manufacturer documentation.
おすすめ
Multichannel Industrial Sensor Interface
The MCP3903T-I/SS can also serve as a multichannel interface for low-bandwidth industrial sensors that benefit from high-resolution delta-sigma conversion. Selectable 16-bit and 24-bit modes permit a single device to serve both precision and lower-processing applications, while the SPI-compatible interface connects the measurements to a digital controller. The internal reference reduces external analog overhead. Because the six inputs share package and supply resources, designers must verify common-mode range, input bandwidth, filtering, isolation, and channel-to-channel performance for the specific sensor signals.
おすすめ
Power-Supply and Inverter Monitoring
The MCP3903T-I/SS is useful in inverter, power-converter, and power-supply monitoring systems where multiple voltage rails and phase currents must be observed together. Synchronous sampling improves the consistency of measurements used for control or diagnostics, and the 91 dB SINAD specification supports detection of relatively small AC components. The phase-delay compensation block is particularly relevant when signal timing must be reconciled. Care is required around high-dV/dt switching nodes, so analog inputs should be filtered and shielded to prevent common-mode conversion errors.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MCP3903T-I/SS — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MCP3903T-E/SS |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP |
| ADC Channels | 6 channels | 6 channels |
| Maximum ADC Resolution | 24-bit | 24-bit |
| Converter Architecture | Synchronous-sampling delta-sigma | Synchronous-sampling delta-sigma |
| Temperature Grade | I grade | E grade |
主な差別化要因
- Six-channel synchronous acquisition in one 28-SSOP package （vs MCP3903T-E/SS)
- Precision delta-sigma performance for energy measurement （vs MCP3903T-E/SS)
- Integrated metering signal chain （vs MCP3903T-E/SS)
設計ノート
Route the six analog inputs as short, guarded traces and place their input filtering components close to the MCP3903T-I/SS. Keep high-voltage dividers, shunts, surge-protection devices, and switching-power stages physically separated from the converter pins. A continuous ground plane under the analog section is recommended only where it does not conflict with the grounding strategy required for isolation barriers or high-current return paths.
Design the current-measurement path around the shunt and amplifier-network bandwidth. The MCP3903 delta-sigma converter includes dithering, but dithering does not remove errors caused by differential mismatch, common-mode conversion, inadequate filtering, or PCB leakage. Verify input attenuation, anti-alias corner frequencies, and channel-to-channel calibration before relying on the specified 91 dB SINAD and -100 dBc THD figures.
Decouple the 2.7 V to 3.6 V digital and 4.5 V to 5.5 V analog supplies independently with capacitors placed near the corresponding pins. Join the ground system according to the application's isolation architecture rather than assuming a single-point or multipoint arrangement. Check the final layout against the power-supply application guidance in Microchip Technology datasheet 25048B to minimize supply ripple coupling into the precision ADC measurements.
コンプライアンス情報
The exact MCP3903T-I/SS order code is listed as EAR99. Part-specific RoHS, REACH, lead-free, halogen-free, conflict-minerals, and AEC-Q100 declarations were not identified and must be confirmed with Microchip Technology.
