Datasheet Si8931/32 (Silicon Labs)

Si8931/32 Data Sheet
Isolated Amplifier for Voltage Measurement
KEY FEATURES
The Si8931/32 is a galvanically isolated analog amplifier optimized for voltage sensing. Its 2.5 V input range is ideal for isolated voltage sensing applications. The output is a differential ana- • 0 to 2.5 V nominal input voltage log signal (Si8931) or single-ended signal (Si8932) that is proportional to the input voltage. • Low signal delay: 1 µs The Si8931/32 provides excellent linearity with low offset and gain drift to ensure that accuracy • Typical input offset: 0.2 mV is maintained over the entire operating temperature range. Exceptionally high common-mode • Typical gain error: ±0.1% transient immunity means that the Si8931/32 delivers accurate measurements even in the pres- • Excellent drift specifications ence of high-power switching as is found in motor drive systems and inverters. • 0.75 µV/°C offset drift • 6 ppm/°C typical gain drift The Si8931/32 isolated voltage sensing amplifier utilizes Silicon Labs’ proprietary isolation tech- nology. It supports up to 5.0 kVrms withstand voltage per UL1577. This technology enables • Typical nonlinearity: 0.004% higher performance, reduced variation with temperature and age, tighter part-to-part matching, • Typical SNR: 76 dB and longer lifetimes compared to other isolation technologies. • High common-mode transient immunity: 75 kV/µs
Applications:
• Compact packages • Industrial, HEV and renewable energy inverters • 8-pin wide body stretched SOIC • AC, Brushless, and DC motor controls and drives • 8-pin narrow body SOIC • Variable speed motor control in consumer white goods • –40 to 125 °C • Isolated switch mode and UPS power supplies • Automotive BMS and charging • General industrial data acquisition and sensor interface
Safety Approvals (pending):
• UL 1577 recognized • Up to 5000 Vrms for 1 minute • CSA component notice 5A approval • IEC 60950-1 (reinforced insulation) • VDE certification conformity • VDE0884 Part 10 (basic/reinforced insulation) • CQC certification approval • GB4943.1
Si8931 Si8932
VDDA VDDB VDDA VDDB OSC OSC VIN AOP VIN AO PWM PWM PWM PWM NC AON NC NC
Transmitter Receiver Transmitter Receiver
GNDA CMOS Isolation GNDB GNDA CMOS Isolation GNDB
silabs.com
| Building a more connected world. Preliminary Rev. 0.5 This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Document Outline 1. Ordering Guide 2. System Overview 3. Voltage Sense Application 4. Electrical Specifications 4.1 Regulatory Information 4.2 Typical Operating Characteristics 5. Pin Descriptions 5.1 Si8931 Pin Descriptions 5.2 Si8932 Pin Descriptions 6. Packaging 6.1 Package Outline: 8-Pin Wide Body Stretched SOIC 6.2 Package Outline: 8-Pin Narrow Body SOIC 6.3 Land Pattern: 8-Pin Wide Body Stretched SOIC 6.4 Land Pattern: 8-Pin Narrow Body SOIC 6.5 Top Marking: 8-Pin Wide Body Stretched SOIC 6.6 Top Marking: 8-Pin Narrow Body SOIC 7. Document Revision History