Si8921/22 Data Sheet Isolated Amplifier for Current Shunt Measurement KEY FEATURES The Si8921/22 is a galvanically isolated analog amplifier. The low-voltage differential input is ideal for measuring voltage across a current shunt resistor or for any place where a sensor Low-voltage differential input: must be isolated from the control system. The output is a differential analog signal amplified by 62.5 mV and 250 mV options either 8.2x or 32.8x. Low signal delay: 0.8 s Typical input offset: 40 V The very low signal delay of the Si8921/22 allows control systems to respond quickly to fault Typical gain error: 0.06% conditions or changes in load. Low offset and gain drift ensure that accuracy is maintained over Excellent drift specifications: the entire operating temperature range. Exceptionally high common-mode transient immunity 0.5 V/C typical offset drift means that the Si8921/22 delivers accurate measurements even in the presence of high-power switching as is found in motor drive systems and inverters. 9 ppm/C typical gain drift Typical Nonlinearity: 0.003% full- The Si8921/22 isolated amplifier utilizes Skyworks proprietary isolation technology. It supports scale up to 5.0 kVrms withstand voltage per UL1577. This technology enables higher performance, Typical SNR: 82 dB over 100 kHz reduced variation with temperature and age, tighter part-to-part matching, and longer lifetimes bandwidth compared to other isolation technologies. Typical THD: 88 dB Applications: High common-mode transient immunity: 75 kV/s Industrial, HEV, and renewable energy inverters Automotive-grade OPNs: AC, Brushless, and DC motor controls and drives AIAG compliant PPAP Variable speed motor control in consumer white goods documentation support Isolated switch mode and UPS power supplies IMDS and CAMDS listing support Automotive on-board chargers, battery management systems, and charging stations Compact packages: Safety Approvals (pending): 8-pin wide body stretched SOIC UL 1577 recognized 8-pin narrow body SOIC Up to 5000 Vrms for 1 minute 40 to 125 C CSA approval IEC 60950-1, 62368-1 (reinforced insulation) VDE certification conformity VDE0884 Part 11 (basic/reinforced insulation) CQC certification approval GB4943.1-2011 Si8921 Si8922 VDDA VDDB VDDA VDDB OSC OSC AIP AIP AO AOP PWM PWM PWM PWM AIN GNDB AIN AON Transmitter Transmitter Receiver Receiver GNDB GNDA GNDB GNDA Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.8 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 28, 2021 1 CMOS Isolation CMOS IsolationSi8921/22 Data Sheet Ordering Guide 1. Ordering Guide Ordering Options Automotive Ordering Part Ordering Part 1, 2, 3 Specified Input Number 1, 2, 3, 4 Isolation Rating Output Package Type Number Range WB Stretched Si8921AD-IS4 Si8921AD-AS4 62.5 mV 5.0 kVrms Differential SOIC-8 WB Stretched Si8921BD-IS4 Si8921BD-AS4 250 mV 5.0 kVrms Differential SOIC-8 Si8921AB-IS Si8921AB-AS 62.5 mV 2.5 kVrms Differential NB SOIC-8 Si8921BB-IS Si8921BB-AS 250 mV 2.5 kVrms Differential NB SOIC-8 WB Stretched Si8922AD-IS4 Si8922AD-AS4 8 to 62.5 mV 5.0 kVrms Single-ended SOIC-8 WB Stretched Si8922BD-IS4 Si8922BD-AS4 30 to 250 mV 5.0 kVrms Single-ended SOIC-8 Si8922AB-IS Si8922AB-AS 8 to 62.5 mV 2.5 kVrms Single-ended NB SOIC-8 Si8922BB-IS Si8922BB-AS 30 to 250 mV 2.5 kVrms Single-ended NB SOIC-8 Note: 1. All packages are RoHS-compliant. 2. Si and SI are used interchangeably. 3. AEC-Q100 pending qualification. 4. Automotive-Grade devices - suffix) are identical in construction materials, topside marking, and electrical parameters to their Industrial Grade -I suffi) version counterparts. Automotive-Grade products are produced utilizing full automotive process flows and additional statistical process controls throughout the manufacturing flow. The Automotive-Grade part number is included on shipping labels. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 0.8 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 28, 2021 2