MCP3903-I/SS - 6-Channel 24-Bit Energy AFE | Microchip
部品番号: MCP3903-I/SS ✓ 生産中MCP3903-I/SS 概要
An analog front end is an integrated signal-conditioning and conversion block that sits between real-world analog inputs and a digital controller. In the power-management hierarchy, an energy-metering AFE converts voltage and current-sensor waveforms into precise digital measurements. The MCP3903 belongs to this measurement category and is designed around three differential input pairs, making it suitable for three-phase energy monitoring.
Key features include six synchronous-sampling channels, selectable 16-bit or 24-bit resolution, and a maximum conversion rate of 64 ksps. According to the manufacturer product information, the device provides up to 91 dB SINAD and -100 dBc total harmonic distortion. Internal programmable-gain amplifiers support analog input conditioning, while the internal voltage reference reduces the external component count in energy-metering designs.
The architecture uses three pairs of synchronous-sampling delta-sigma analog-to-digital converters. This arrangement is intended to preserve phase relationships between voltage and current measurements, an important consideration in real-time energy calculations. A phase-delay compensation block compensates for propagation differences in the measurement path, while the internal reference provides a stable conversion basis. Digital results and configuration information are accessed through a high-speed 10 MHz SPI-compatible serial interface.
Typical applications include three-phase electricity meters, power-factor monitoring, industrial power-quality instruments, solar and inverter monitoring, and multichannel load analysis. The six-channel architecture allows three voltage and three current measurements to be captured with closely coordinated sampling, reducing the need for multiple discrete converter packages.
A critical design consideration is input range and gain selection. The programmable-gain stages must accommodate current-sensor outputs and voltage dividers without clipping, while the selected resolution should match the required metering accuracy. PCB design should minimize analog-trace interference, provide stable reference and supply decoupling, and keep SPI routing away from sensitive current-input nodes.
This product page consolidates verified manufacturer and distributor information, compares supported MCP3903 family options, and adds practical selection, sourcing, and PCB guidance. It distinguishes documented performance from parameters that still require verification against the manufacturer datasheet and the completed system design.
ドロップイン代替品: MCP3903-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: MCP3903-I/SS （同一形状・フットプリント） — 相違点: Package, ADC Resolution, Serial Interface, ADC Architecture, Total Harmonic Distortion.
MCP3903-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
✅ 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-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 →MCP3903-I/SS 最大定格＆電気的特性
| Channel Count | 6 channels |
| ADC Architecture | Delta-sigma A/D converter |
| ADC Resolution | 16-bit or 24-bit |
| Maximum Sampling Rate | 64 ksps |
| Input Configuration | 3 differential input pairs |
| Sampling Mode | Synchronous sampling |
| Signal Conditioning | Internal programmable-gain amplifiers |
| Reference | Internal voltage reference |
| Phase Compensation | Phase-delay compensation block |
| SINAD | Up to 91 dB |
| Total Harmonic Distortion | -100 dBc |
| Serial Interface | 10 MHz SPI-compatible |
| パッケージ | 28-pin SSOP |
| 実装タイプ | Surface mount |
| Primary Application | Three-phase energy measurement |
| RoHS ステータス | Compliant |
| REACH Status | Compliant |
| Conflict-Free Status | Conflict Free |
MCP3903-I/SS 28-pin ssop ピン配置ガイド
MCP3903-I/SS (28-pin ssop 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: MCP3903-I/SS.
詳細は データシート をご参照ください。
主な用途
MCP3903-I/SS の用途: 6 件s: Three-Phase Electricity Metering, Power-Factor and Active-Energy Measurement, Industrial Power-Quality Monitoring, Solar and Inverter Monitoring, Multichannel Load Analysis, Energy-Storage and Battery Monitoring.
Three-Phase Electricity Metering
The MCP3903-I/SS fits three-phase electricity metering because its six synchronous-sampling channels form three differential pairs, allowing three voltage signals and three current signals to be converted under coordinated timing. The verified device supports 16-bit or 24-bit delta-sigma resolution, operation up to 64 ksps, and up to 91 dB SINAD. Internal programmable-gain amplifiers condition current-channel inputs while the internal voltage reference supports repeatable measurements. Designers use the 10 MHz SPI-compatible interface to transfer results to a metering controller. The principal engineering check is gain selection: voltage dividers and current-sensor outputs must remain within the permitted input range while preserving sufficient resolution for regulatory accuracy.
おすすめ
Power-Factor and Active-Energy Measurement
For real-time power-factor and active-energy calculations, the MCP3903-I/SS provides the synchronized voltage and current sampling needed by three-phase measurement systems. Its three differential input pairs map naturally to the three phases, while phase-delay compensation helps compensate propagation differences in the measurement path. The documented 64 ksps rate, selectable 16/24-bit resolution, and -100 dBc THD support accurate waveform processing. A controller can retrieve results through the 10 MHz SPI-compatible interface. Engineers should calibrate gain and offset against the final current sensor, voltage divider, and analog filter so the metrology performance reflects the complete system rather than converter specifications alone.
おすすめ
Industrial Power-Quality Monitoring
The MCP3903-I/SS is suitable for industrial power-quality instruments that measure multiple voltage and current channels in a compact embedded assembly. Six synchronous inputs reduce the number of separate converter packages needed for three-phase analysis, while internal programmable-gain amplifiers help adapt different sensor outputs. Its delta-sigma conversion architecture, 16/24-bit selectable resolution, and 64 ksps maximum rate provide a useful combination of throughput and metering resolution. The 28-pin SSOP supports compact board layouts, but sensitive analog traces must remain separated from the 10 MHz SPI bus and switching supplies. Galvanic isolation and sensor conditioning, where required, must be implemented outside the AFE.
おすすめ
Solar and Inverter Monitoring
The MCP3903-I/SS can monitor voltage and current in solar inverters, power optimizers, and energy-storage systems where multiple electrical quantities must be captured together. Its three differential input pairs provide coordinated measurements across three channels or channels, and the synchronous delta-sigma converters support phase-sensitive calculations. Programmable internal gain stages simplify front-end scaling for different current sensors, while the internal reference reduces reliance on external reference circuitry. For inverter control loops, verify the 64 ksps maximum conversion rate against the required control bandwidth and use the phase-delay compensation capability only after validating the complete signal path. SPI timing and power-supply isolation remain critical layout considerations.
おすすめ
Multichannel Load Analysis
For multichannel load analysis equipment, the MCP3903-I/SS allows six analog inputs to be sampled synchronously rather than relying on unrelated converter timing. This is useful in laboratory and industrial analyzers that compare phase voltages, branch currents, or differential signals. The device offers selectable 16/24-bit delta-sigma resolution, up to 64 ksps operation, internal gain control, and phase-delay compensation. Data is transferred through a 10 MHz SPI-compatible interface to a host processor. The design must ensure that every input remains within range at worst-case transients, that sensor bandwidth does not distort the target harmonics, and that grounding minimizes crosstalk between high-energy current paths and low-level measurement channels.
おすすめ
Energy-Storage and Battery Monitoring
The MCP3903-I/SS can support coordinated battery-system measurements where multiple pack voltages and currents must be converted into digital data for state-of-charge or protection calculations. Its three differential pairs and six synchronous channels provide a compact way to capture three current measurements and three related voltage measurements. Selectable 16/24-bit resolution and up to 64 ksps operation offer flexibility between measurement bandwidth and conversion detail. Internal programmable-gain amplifiers can scale suitable current-sensor outputs, but battery systems commonly require additional protection, isolation, and filtering. Engineers should also verify the AFE's exact supply and input limits, which are not present in the verified excerpts, before integrating it into a high-energy pack.
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: MCP3903-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 | MCP3903-E/SS | MCP3903T-I/SS | MCP3903T-E/SS |
|---|---|---|---|---|
| Package | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Channel Count | 6 channels | 6 channels | 6 channels | 6 channels |
| Input Pairs | 3 differential pairs | 3 differential pairs | 3 differential pairs | 3 differential pairs |
| ADC Resolution | 16-bit or 24-bit | 16-bit or 24-bit | 16-bit or 24-bit | 16-bit or 24-bit |
| Maximum Sampling Rate | 64 ksps | 64 ksps | 64 ksps | 64 ksps |
| SINAD | Up to 91 dB | Up to 91 dB | Up to 91 dB | Up to 91 dB |
| THD | -100 dBc | -100 dBc | -100 dBc | -100 dBc |
| Serial Interface | 10 MHz SPI-compatible | 10 MHz SPI-compatible | 10 MHz SPI-compatible | 10 MHz SPI-compatible |
| Internal Reference | Yes | Yes | Yes | Yes |
主な差別化要因
- Coordinated six-channel measurement （vs MCP3903-E/SS)
- High-resolution conversion in a single metering AFE （vs MCP3903T-I/SS)
- Integrated metrology signal conditioning （vs MCP3903T-E/SS)
設計ノート
Route the six analog inputs as short, guarded traces and keep them away from the 10 MHz SPI-compatible signals and switching-supply nodes. Place input filtering and gain-setting components close to the AFE, while providing a quiet ground-reference path. Because the MCP3903 uses three differential pairs for synchronized measurements, matching trace geometry and keeping the three channels symmetric can reduce timing and channel-to-channel differences in the completed meter.
Decouple the AFE supply at the package and follow the manufacturer datasheet for the required input, output, and bulk capacitance values. Supply ripple can affect conversion accuracy even when the AFE uses an internal voltage reference. Keep the reference and analog supply away from high-current switching nodes, and verify startup behavior across the complete source voltage range. The exact supply limits were not included in the verified excerpts and must not be inferred.
Design the current and voltage channels as matched analog paths. Use identical divider ratios, sensor filters, and trace geometry where practical, and include calibration points for gain, offset, and phase error. The MCP3903 includes phase-delay compensation, but compensation cannot remove external propagation differences or poor sensor alignment. Validate those effects with the final current transformers, shunts, wiring, and protective networks rather than relying on converter specifications alone.
Do not select a replacement from the family name alone. Verify the ordering suffix, temperature grade, package drawing, pinout, and tape-or-tube configuration for MCP3903-I/SS, MCP3903-E/SS, and MCP3903T variants. Also confirm the exact analog input range and supported PGA gains against the datasheet. The verified excerpts establish the common six-channel architecture but do not provide every ordering-code or electrical-limit detail required for a production substitution.
コンプライアンス情報
The verified Abacus Technologies distributor entry states EU RoHS Compliant, REACH Compliant, and DRC Status: DRC Conflict Free. The supplied data does not verify AEC-Q100 qualification, lead-free status, or halogen-free status.