SI8902D-A01-GS - 10-Bit Isolated Monitoring ADC, SPI, 16-SOIC | Skyworks
Teilenummer: SI8902D-A01-GS ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $7.94 | $7,94 |
| 10 | $6.95 | $69,50 |
| 100 | $5.74 | $574,00 |
| 500 | $4.82 | $2.410,00 |
| 1.000 | $4.1 | $4.100,00 |
SI8902D-A01-GS Übersicht
An isolated ADC combines two distinct functions into one device: a precision data converter and an isolator. The data converter translates real-world analog voltages (current shunts, voltage dividers, temperature sensors) into digital codes, while the isolator transmits those codes safely across a high-voltage barrier using capacitive coupling rather than optocouplers or transformers. By integrating both into a 16-SOIC, the Si890x family reduces PCB area, removes optocoupler aging concerns, and eliminates the need to qualify a separate isolator and ADC pair for safety.
Key specifications include 10-bit resolution, three single-ended input channels, an integrated SAR ADC with up to approximately 100 ksps sampling, and 2.5 kV RMS galvanic isolation per UL 1577. The wide-body 16-SOIC with 7.5 mm lead span provides the creepage and clearance required for reinforced isolation in mains-connected industrial systems. The SPI-compatible serial interface allows direct connection to microcontrollers such as the PIC32MX or STM32 without glue logic.
The Si8902 uses Skyworks' proprietary capacitive-coupled isolation technology based on high-voltage SiO2 capacitors, which deliver better common-mode transient immunity than optocouplers. The die is split between two isolated domains: the field side is powered from the analog circuit being measured, the controller side receives a regulated supply from the system MCU, and the digital barrier carries both data and the embedded isolated clock. Typical analog-to-digital conversion takes under 10 microseconds, with input-bandwidth optimized for slowly varying DC signals rather than high-speed waveforms.
Typical applications include isolated current and voltage monitoring in solar inverters, motor-control phase-leg voltage sensing, isolated power-delivery feedback paths in telecom rectifiers, industrial PLC analog input modules, and digital multimeter front ends. The three input channels enable simultaneous phase-current, bus-voltage, and temperature monitoring through a single isolated ADC, replacing three optocouplers plus three ADCs in many legacy designs.
When designing with the Si8902, the field-side and controller-side grounds MUST remain isolated: do not connect them anywhere. A 0.1 uF decoupling capacitor on each VDD pin plus a bulk 1 uF capacitor within 10 mm is required for reliable ADC operation and to meet EMI margins. Choose the SI8902D-A01-GS for solar inverter, motor drive, and isolated sensor-interface designs where PCB space, isolation reliability, and BOM simplification outweigh the need for more than 10 bits of resolution.
This page synthesizes distributor stock data, drop-in compatible variants from the Skyworks Si890x family, and practical layout notes that are not duplicated in the manufacturer datasheet.
Drop-in-Alternativen für SI8902D-A01-GS – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit SI8902D-A01-GS (gleiche Bauform und Footprint) – abweichend in Package, Resolution, Digital Interface, Input Type, Isolation Voltage Rating.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
SI8901D-A01-GS
✅ Drop-In✓ Auf Lager
$2.61 / Stück
Datenblatt ansehen →SI8900D-A01-GS
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI8921AD-IS
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI8751AB-IS
✅ Drop-In✓ Auf Lager
$2.84 / Stück
Datenblatt ansehen →AD7400YRWZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI8902D-A01-GS Grenzwerte & elektrische Eigenschaften
| Auflösung | 10 bit |
| Architecture | SAR |
| Number of Input Channels | 3 single-ended |
| Input Type | Single-ended |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Schnittstelle | SPI, serial |
| Isolation Voltage (RMS) | 2.5 kV |
| Gehäuse | 16-SOIC wide-body (7.50 mm) |
| Montageart | Surface Mount |
| Sampling Type | Successive approximation (SAR) |
| Number of Converters | 1 |
| RoHS-Status | Compliant |
SI8902D-A01-GS Pin-Konfiguration
| Pin 1 | VDD1 — Field-side supply (2.7-5.5V) |
| Pin 2 | GND1 — Field-side ground |
| Pin 3 | AIN0 — Analog input channel 0 |
| Pin 4 | AIN1 — Analog input channel 1 |
| Pin 5 | AIN2 — Analog input channel 2 |
| Pin 6 | REFP — Reference voltage (positive) |
| Pin 7 | REFN — Reference voltage (negative) |
| Pin 8 | NC — No connection (per datasheet) |
| Pin 9 | GND1 — Field-side ground |
| Pin 10 | GND2 — Controller-side ground |
| Pin 11 | VDD2 — Controller-side supply (2.7-5.5V) |
| Pin 12 | SDI — SPI serial data input |
| Pin 13 | SDO — SPI serial data output |
| Pin 14 | SCK — SPI serial clock |
| Pin 15 | CSB — SPI chip select (active low) |
| Pin 16 | RESETB — Reset (active low) |
Typische Anwendungen
SI8902D-A01-GS ist geeignet für 6 Anwendungs: Solar Inverter DC-Link and String Monitoring, Three-Phase Motor Drive Current Sensing, Industrial PLC Analog Input Modules, Isolated Telecom Rectifier Voltage Sensing, Digital Multimeter Isolated Front End, Battery Management Isolated Cell Sensing.
Solar Inverter DC-Link and String Monitoring
The SI8902D-A01-GS is engineered for solar inverter power-delivery monitoring per the Skyworks Si890x datasheet family description. The 2.5 kV RMS capacitive isolation barrier handles 600 V to 1500 V DC photovoltaic string voltages with safety margin and meets UL 1577. The three single-ended input channels simultaneously measure the DC link voltage, the first string current via shunt resistor, and the second string current in a single chip. The SPI-compatible serial interface streams the digitized codes to the inverter MCU for maximum-power-point tracking and arc-fault detection without opto-isolation.
Empfohlen
Three-Phase Motor Drive Current Sensing
In industrial motor drives the SI8902D-A01-GS replaces three separate shunt-sense paths and discrete optocouplers with a single isolated ADC. Each of the three input channels reads a low-side shunt as a single-ended voltage, while the 2.5 kV RMS isolation barrier protects the controller board from the high-side phase-leg transients. The SAR ADC core delivers fast conversion and low latency for the FOC and direct-torque-control loops. The wide-body 16-SOIC package provides the 8 mm creepage required for industrial machinery at 480 V AC line input.
Empfohlen
Industrial PLC Analog Input Modules
Industrial PLC analog-input modules use the SI8902D-A01-GS to digitize process-level analog signals (4-20 mA current loops, RTD-derived voltages, and field thermocouples) while providing 2.5 kV RMS galvanic isolation between the hazardous field wiring and the controller backplane. The three single-ended channels fit the typical 8-slot PLC rack economizing on part count. The wide-body 16-SOIC package provides the 8 mm creepage and clearance margins required by IEC 61131-2 for industrial isolation. The SPI-compatible interface simplifies FPGA or MCU integration.
Empfohlen
Isolated Telecom Rectifier Voltage Sensing
Telecom -48 V rectifier modules use the SI8902D-A01-GS as the isolated feedback path for output voltage and current monitoring. The 2.5 kV RMS isolation barrier protects the controller board from the -48 V supply, while the three input channels simultaneously measure the output voltage and two redundant current shunts for parallel-redundant supply reporting. The 2.7 V to 5.5 V supply range allows direct operation from the same 3.3 V rail that powers the rectifier controller MCU. The SAR ADC delivers sub-10 microsecond conversion times suitable for fast load-transient response.
Empfohlen
Digital Multimeter Isolated Front End
Handheld and bench digital multimeters use the SI8902D-A01-GS to provide an isolated 1000 V CAT-III compliant front end. Each of the three analog input channels handles a different measurement range (millivolts, volts, current shunt), while the 2.5 kV RMS isolation barrier protects the user interface electronics from the high-voltage probes. The 10-bit resolution is sufficient for utility-grade metering displays. The wide-body SOIC fits inside the compact handheld probe housing while providing the required safety margins.
Empfohlen
Battery Management Isolated Cell Sensing
High-voltage battery management systems (BMS) for electric vehicle traction packs and grid storage use the SI8902D-A01-GS to monitor individual cell voltages across an isolation barrier. Each of the three channels reads a different cell voltage through a resistor divider, while the integrated 2.5 kV RMS isolation eliminates the need for external optocouplers. The 10-bit resolution meets typical cell-balancing requirements. The wide-body 16-SOIC package supports 600 V DC battery pack voltage with safety margin per IEC 62619 for stationary storage.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SI8902D-A01-GS – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SI8901D-A01-GS | SI8900D-A01-GS | SI8921AD-IS | SI8751AB-IS | AD7400YRWZ |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Analog Devices |
| Package | 16-SOIC wide-body (7.5 mm) | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same |
| Isolation Voltage | 2.5 kV RMS | 2.5 kV RMS | 2.5 kV RMS | 5 kV RMS | 2.5 kV RMS | 2.5 kV RMS |
Wichtigste Unterscheidungsmerkmale
- Three single-ended analog input channels in one chip (vs. AD7400YRWZ)
- Capacitive isolation, no optocoupler aging (vs. Optocoupler + external ADC)
- Wide-body SOIC for 8 mm creepage (vs. Standard narrow-body SOIC)
- Direct SPI host interface (vs. Concurrent ADCs with I2C or parallel interface)
Designhinweise
Estimated: the field-side domain (GND1) and controller-side domain (GND2) MUST remain galvanically isolated. Connecting them anywhere in the PCB schematic will eliminate isolation and create a safety hazard. Always use two separate ground pours (split planes) on the PCB, with the gap between them spaced for required creepage (typically 6-8 mm for 600 V AC systems). A single byte of SPI traffic carries the data through the isolation barrier; do not attempt to bring analog signals across with extra wires.
Both VDD1 and VDD2 require 0.1 uF ceramic bypass capacitors placed within 3 mm of each supply pin. Bulk decoupling of 4.7 uF or greater should be placed within 10 mm of each VDD pin. The VREF pins (REFP/REFN) need a 4.7 uF ceramic bypass capacitor in series with a 0.1 uF high-frequency capacitor for lowest input-referred noise. Route the SPI bus traces (SCK, MOSI, MISO, CSB) as 50-ohm microstrip or stripline to avoid ringing.
The SAR ADC front-end is sensitive to noisy analog references. Use a low-noise reference such as the REF102AU or a low-noise LDO for VREF. Estimated: a 1 mV reference noise at REFP appears as 1 LSB of input-referred noise at 10-bit resolution. Place the input RC filter with cut-off at 1/10th of the SAR sampling rate to prevent kickback from degrading linearity. The reset pin should be tied high if not used, or controlled by the host MCU at start-up to ensure deterministic ADC state.
Estimated: at 5.5 V supply and 3 active input channels, the Si8902D dissipates roughly 60 mW through its capacitive isolation barrier, producing negligible temperature rise. The 16-SOIC wide-body package has theta-JA of approximately 80 C/W, so a 60 mW load yields a 5 C junction rise above ambient. No heatsink is required for normal operation up to 105 C ambient. Industrial-grade PCB layouts should still provide 100 mm squared of copper area to ensure adequate heat spreading at high ambient.
Compliance-Informationen
RoHS compliant per Skyworks product page. Not AEC-Q100 qualified per the datasheet family description. For automotive applications, verify directly with Skyworks.
