SI8902D-A01-GS - 10-Bit Isolated Monitoring ADC, SPI, 16-SOIC | Skyworks
부품 번호: SI8902D-A01-GS ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 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 개요
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.
드롭인 대체품: SI8902D-A01-GS — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: SI8902D-A01-GS (동일 폼 팩터 및 풋프린트) — 차이점: Package, Resolution, Digital Interface, Input Type, Isolation Voltage Rating.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
SI8901D-A01-GS
✅ 드롭인✓ 재고 있음
$2.61 / 개
데이터시트 보기 →SI8900D-A01-GS
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
SI8921AD-IS
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
SI8751AB-IS
✅ 드롭인✓ 재고 있음
$2.84 / 개
데이터시트 보기 →AD7400YRWZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
SI8902D-A01-GS 최대 정격 & 전기적 특성
| 분해능 | 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 |
| 인터페이스 | SPI, serial |
| Isolation Voltage (RMS) | 2.5 kV |
| 패키지 | 16-SOIC wide-body (7.50 mm) |
| 실장 유형 | Surface Mount |
| Sampling Type | Successive approximation (SAR) |
| Number of Converters | 1 |
| RoHS 상태 | Compliant |
SI8902D-A01-GS 핀 구성
| 핀 1 | VDD1 — Field-side supply (2.7-5.5V) |
| 핀 2 | GND1 — Field-side ground |
| 핀 3 | AIN0 — Analog input channel 0 |
| 핀 4 | AIN1 — Analog input channel 1 |
| 핀 5 | AIN2 — Analog input channel 2 |
| 핀 6 | REFP — Reference voltage (positive) |
| 핀 7 | REFN — Reference voltage (negative) |
| 핀 8 | NC — No connection (per datasheet) |
| 핀 9 | GND1 — Field-side ground |
| 핀 10 | GND2 — Controller-side ground |
| 핀 11 | VDD2 — Controller-side supply (2.7-5.5V) |
| 핀 12 | SDI — SPI serial data input |
| 핀 13 | SDO — SPI serial data output |
| 핀 14 | SCK — SPI serial clock |
| 핀 15 | CSB — SPI chip select (active low) |
| 핀 16 | RESETB — Reset (active low) |
일반적인 애플리케이션
SI8902D-A01-GS 적합 용도: 6 애플리케이션s: 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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: SI8902D-A01-GS — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- 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)
설계 노트
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.
규정 준수 정보
RoHS compliant per Skyworks product page. Not AEC-Q100 qualified per the datasheet family description. For automotive applications, verify directly with Skyworks.
