DATA SHEET
Si8931 and Si8932 Isolated Analog Amplifier
Applications
• Industrial, HEV and renewable energy inverters • AC, brushless, and DC motor controls and drives • Variable speed motor control in white goods • Isolated switch mode and UPS power supplies • General industrial data acquisition and
sensor interface • Automotive on-board chargers, battery management
systems, and charging stations
Features
• 0 to 2.5 V nominal input voltage • Low signal delay: 1 µs • Typical input offset: 0.16 mV • Typical gain error: ±0.06% • Excellent drift specifications
- 0.75 µV/°C offset drift - 6 ppm/°C typical gain drift • Typical nonlinearity: 0.01% • Typical SNR: 76 dB • High common-mode transient immunity: 75 kV/µs • Automotive-grade OPNs available - AEC-Q100 qualification - AIAG-compliant PPAP documentation support - IMDS and CAMDS listing support • Compact packages - 8-pin wide body stretched SOIC - 8-pin narrow body SOIC • –40 to 125 °C
Safety Approvals
• UL 1577 recognized - Up to 5000 kVRMS for 1 minute
• CSA certification conformity - 62368-1 (reinforced insulation)
• VDE certification conformity (pending) - 60747-17 (reinforced insulation)
• CQC certification approval - GB4943.1
VDDA VIN NC
GNDA
CMOS Isolation
Si8931
OSC PWM
Transmitter
PWM
Receiver
VDDB AOP AON GNDB
Figure 1. Si8931 Block Diagram
Si8932
VDDA VIN NC
GNDA
OSC PWM
Transmitter
CMOS Isolation
PWM
Receiver
VDDB AO GNDB GNDB
Figure 2. Si8932 Block Diagram
Description
The Si8931 and Si8932 galvanically isolated analog amplifiers feature 2.5 V input range and are optimized for isolated voltage sensing applications. The output is a differential analog signal (Si8931) or a single-ended signal (Si8932) proportional to the input voltage.
The Si8931/32 provide excellent linearity with low offset and gain drift to maintain accuracy over the entire operating temperature range. Exceptionally high common-mode transient immunity ensures the Si8931/32 deliver accurate measurements even in the presence of high-power switching in motor drive systems and inverters.
The Si8931/32 isolated voltage sensing amplifier utilizes Skyworks proprietary isolation technology, and withstands up to 5.0 kVRMS per UL1577. This technology enables high performance, reduced variation with temperature and age, tighter part-to-part matching, and longer lifetimes compared to other isolation technologies.
Automotive Grade is available for certain part numbers. These products are built using automotive-specific flows at all steps in the manufacturing process to ensure the robustness and low defectivity required for automotive applications.
Skyworks Solutions, Inc. • Phone [949] 231-3000 •
[email protected] • www.skyworksinc.com
206438D • Skyworks Proprietary Information • Products and Product Information are Subject to Change without Notice
1
October 2, 2023
DATA SHEET
Si8931/Si8932
Figure 3. Si8931 Pinout (Top View)
Table 1. Si8931 Pin Descriptions
Name VDDA
Pin Number
Description
1
Input side power supply
VIN
2
Voltage input
NC1
3
No Connect
GNDA
4
Input side ground
GNDB
5
Output side ground
AON
6
Analog output low
AOP
7
Analog output high
VDDB
8
Output side power supply
1. No Connect. These pins are not internally connected. To maximize CMTI performance, these pins should be connected to the ground plane.
Skyworks Solutions, Inc. • Phone [949] 231-3000 •
[email protected] • www.skyworksinc.com
206438D • Skyworks Proprietary Information • Products and Product Information are Subject to Change without Notice
2
October 2, 2023
DATA SHEET
Si8931/Si8932
Figure 4. Si8932 Pinout (Top View)
Table 2. Si8932 Pin Descriptions
Name VDDA
Pin Number 1
Description Input side power supply
VIN NC1 GNDA GNDB2 GNDB2 AO
2
Voltage input
3
No Connect
4
Input side ground
5
Output side ground
6
Output side ground
7
Analog output
VDDB
8
Output side power supply
1. No Connect. These pins are not internally connected. To maximize CMTI performance, these pins should be connected to the ground plane.
2. Both pin 5 and pin 6 must be connected to ground.
Skyworks Solutions, Inc. • Phone [949] 231-3000 •
[email protected] • www.skyworksinc.com
206438D • Skyworks Proprietary Information • Products and Product Information are Subject to Change without Notice
3
October 2, 2023
DATA SHEET
Si8931/Si8932
1. Technical Description
The Si8931/32 are designed for 0 to 2.5 V nominal input.
The Si8931/32 modulates the analog signal in a unique way for transmission across the semiconductor based isolation barrier. The input signal is first converted to a pulse-width modulated digital signal. On the other side of the isolation barrier, the signal is demodulated to faithfully reproduce the analog signal. This solution provides exceptional signal bandwidth and accuracy. The Si8931 provides a differential voltage output while the Si8932 provides a single-e.