Si8935/36/37 Data Sheet Delta-Sigma Modulator for Voltage Measurement KEY FEATURES The Si8935/36/37 is a galvanically isolated delta-sigma modulator optimized for voltage sens- ing. Its 2.5 V input range is ideal for isolated voltage sensing applications. The Si8935/36/37 0 to 2.5 V nominal input voltage provides excellent linearity with low offset and gain drift to ensure that accuracy is maintained Modulator clock options over the entire operating temperature range. Exceptionally high common-mode transient im- External clock up to 25 MHz munity means that the Si8935/36/37 delivers accurate measurements even in the presence of (Si8935) high-power switching as is found in motor drive systems and inverters. 10 MHz internal clock (Si8936) 20 MHz internal clock (Si8937) The output of the Si8935/36/37 comes from a second-order, delta-sigma modulator. The modu- Typical input offset: 0.4 mV lator can be clocked either from an onboard oscillator (Si8936/37) or from an external clock (Si8935). The output is typically digitally filtered by a MCU or FPGA in the system. Typical gain error: 0.05% Excellent drift specifications The Si8935/36/37 isolated delta-sigma modulator utilizes Skyworks proprietary isolation tech- 0.5 V/C typical offset drift nology. It supports up to 5.0 kVrms withstand voltage per UL1577. This technology enables 9 ppm/C typical gain drift higher performance, reduced variation with temperature and age, tighter part-to-part matching, Typical nonlinearity: 0.003% and longer lifetimes compared to other isolation technologies. Typical SNR: 86 dB Applications: High common-mode transient Industrial, HEV and renewable energy inverters immunity: 75 kV/s Auomotive-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 General industrial data acquisition and sensor interface support Automotive onboard chargers, battery management systems, and charging stations Compact packages 8-pin wide body stretched SOIC Safety Approvals (Pending): 8-pin narrow body SOIC UL 1577 recognized 40 to 125 C Up to 5000 Vrms for 1 minute CSA approval IEC 60950-1, 62368-1 (reinforced insulation) VDE certification conformity VDE0884 Part 11 (basic/reinforced insulation) CQC certification approval GB4943.1-2011 Si8935, Si8936, Si8937 VDDA VDDB VIN CLK ACLK DSM ADAT NC Receiver Transmitter 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 IsolationSi8935/36/37 Data Sheet Ordering Guide 1. Ordering Guide 1, 2, 3 Table 1.1. Si8935-36-37 Ordering Guide Ordering Options Ordering 4 Automotive OPN Part Number (OPN) Isolation Rating Clock Package Type WB Stretched Si8935D-IS4 Si8935D-AS4 5.0 kVrms Input SOIC-8 Si8935B-IS Si8935B-AS 2.5 kVrms Input NB SOIC-8 WB Stretched Si8936D-IS4 Si8936D-AS4 5.0 kVrms 10 MHz Output SOIC-8 Si8936B-IS Si8936B-AS 2.5 kVrms 10 MHz Output NB SOIC-8 WB Stretched Si8937D-IS4 Si8937D-AS4 5.0 kVrms 20 MHz Output SOIC-8 Si8937B-IS Si8937B-AS 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