Si8941/46/47 Data Sheet Isolated Delta-Sigma Modulator for Current Shunt Measurement KEY FEATURES The Si8941/46/47 is a galvanically isolated delta-sigma modulator which outputs a digital signal proportional to the voltage level at the input. The low-voltage differential input is ideal for Low voltage differential input measuring voltage across a current shunt resistor or for any place where a sensor must be 62.5 mV and 250 mV options isolated from the control system. Low noise, low error, and high precision ensure an accurate Modulator clock options measurement of system current. External clock up to 25 MHz (Si8941) The output of the Si8941/46/47 comes from a 2nd order delta-sigma modulator. The modula- 10 MHz internal clock (Si8946) tor can be clocked either from an onboard oscillator (Si8946/47) or from an external clock 20 MHz internal clock (Si8947) (Si8941). The output is typically digitally filtered by an MCU or FPGA in the system. Typical input offset: 50 V The Si8941/46/47 isolated delta-sigma modulator utilizes Skyworks proprietary isolation tech- Typical gain error: 0.05% nology. It supports up to 5.0 kVrms withstand voltage per UL1577. This technology enables Excellent drift specifications higher performance, reduced variation with temperature and age, tighter part-to-part matching, 0.5 V/C typical offset drift and longer lifetimes compared to other isolation technologies. 4 ppm/C typical gain drift Applications: Typical 14-bit (ENOB) precision High common-mode transient Industrial, HEV and renewable energy inverters immunity: 75 kV/s AC, Brushless, and DC motor controls and drives Typical SNR: 90 dB Variable speed motor control in consumer white goods Typical THD: 97 dB Isolated switch mode and UPS power supplies Typical nonlinearity: 0.001% Automotive onboard chargers, battery management systems, and charging stations Auomotive-grade OPNs AIAG-compliant PPAP Safety Approvals (pending): documentation support UL 1577 recognized IMDS and CAMDS listing Up to 5000 Vrms for 1 minute support CSA approval Compact packages 8-pin wide body stretched SOIC IEC 60950-1, 62368-1 (reinforced insulation) 8-pin narrow body SOIC VDE certification conformity 40 to 125 C VDE0884 Part 11 (basic/reinforced insulation) CQC certification approval GB4943.1-2011 Si894x VDDA VDDB AIP CLK ACLK DSM ADAT AIN Transmitter Receiver GNDA GNDB Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.7 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 4, 2021 1 CMOS IsolationSi8941/46/47 Data Sheet Ordering Guide 1. Ordering Guide 1, 2, 3 Table 1.1. Si8941-46-47 Ordering Guide Ordering Options Ordering 4 Automotive OPN Specified Input Part Number (OPN) Isolation Rating Clock Package Type Range WB Stretched Si8941AD-IS4 Si8941AD-AS4 62.5 mV 5.0 kVrms Input SOIC-8 WB Stretched Si8941BD-IS4 Si8941BD-AS4 250 mV 5.0 kVrms Input SOIC-8 WB Stretched SI8946AD-IS4 SI8946AD-AS4 62.5 mV 5.0 kVrms 10 MHz Output SOIC-8 WB Stretched SI8946BD-IS4 SI8946BD-AS4 250 mV 5.0 kVrms 10 MHz Output SOIC-8 WB Stretched SI8947AD-IS4 SI8947AD-AS4 62.5 mV 5.0 kVrms 20 MHz Output SOIC-8 WB Stretched SI8947BD-IS4 SI8947BD-AS4 250 mV 5.0 kVrms 20 MHz Output SOIC-8 Si8941AB-IS Si8941AB-AS 62.5 mV 2.5 kVrms Input NB SOIC-8 Si8941BB-IS Si8941BB-AS 250 mV 2.5 kVrms Input NB SOIC-8 SI8946AB-IS SI8946AB-AS 62.5 mV 2.5 kVrms 10 MHz Output NB SOIC-8 SI8946BB-IS SI8946BB-AS 250 mV 2.5 kVrms 10 MHz Output NB SOIC-8 SI8947AB-IS SI8947AB-AS 62.5 mV 2.5 kVrms 20 MHz Output NB SOIC-8 SI8947BB-IS SI8947BB-AS 250 mV 2.5 kVrms 20 MHz Output 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 suffix) 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. 0.7 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 4, 2021 2