TPA8101-SOAR

Overview

The TPA8101-SOAR is a precision isolated delta-sigma modulator manufactured by 3PEAK. It features a capacitive silicon dioxide insulation barrier providing up to 5000 V RMS isolation per UL 1577 and a common-mode transient immunity (CMTI) of 100 kV/μs. The device accepts differential analog inputs within an ±250 mV range, delivering a 1-bit digital output stream via the DOUT pin synchronized to a 5 MHz to 21 MHz clock input at CLKIN. Key electrical specifications include a maximum offset error of 150 μV and a gain error of 0.15% at 25°C. It operates on dual supplies (VDD1 and VDD2) ranging from 3.0 V to 5.5 V and functions across a temperature range of −40°C to +125°C.

Feature Summary

• High Common-Mode Transient Immunity: Achieves 100 kV/μs CMTI through innovative circuit design.
• Precision Analog Performance: Offers low offset error (max 150 μV) and low gain error (max 0.15%) at 25°C.
• Robust Isolation Barrier: Utilizes capacitive SiO2 insulation with 5000 V RMS rating certified under UL 1577.
• System Diagnostics: Includes fail-safe outputs for missing high-side supply voltage detection and common-mode overvoltage monitoring.

Applications

• Industrial Automation
• Motor Control
• Power Supplies

Procurement Notes

Verify that the specific part number suffix matches the required package and qualification level. The standard TPA8101-SOAR is supplied in WSOP8 tape and reel packaging. If automotive reliability certification is required, confirm the presence of the '-S' suffix (TPA8101-SOAR-S), which indicates AEC-Q100 qualification. Ensure ordering documentation aligns with the manufacturer's latest revision history.

Selection Notes

Select this component when high-speed isolation is needed for current sensing or voltage monitoring in noisy environments. The device requires a separate floating power supply for the high side (VDD1), typically derived from gate driver bootstrap circuits. Designers must ensure the clock frequency remains between 5 MHz and 21 MHz and provide adequate decoupling capacitors near both VDD1 and VDD2 pins to maintain signal integrity.

Part Context

The TPA8101 belongs to 3PEAK's family of isolated delta-sigma modulators, designed to digitize analog signals across an isolation barrier. It is often paired with downstream analog filters or ADCs to reconstruct the signal on the low-voltage side. This architecture allows for precise measurement of shunt resistor voltages in motor drives without requiring complex analog front-end conditioning on the high-voltage side.

Replacement Considerations

The datasheet lists TPA8101-TS1R (TSSOP8 package) and TPA8101-SOBR (WSOP16 package) as alternative packages within the same functional family. No other cross-manufacturer substitutes are documented in the provided materials.

FAQ

What is the function of the DOUT pin during a fault condition?

The device provides a fail-safe output. If the high-side supply (VDD1) is missing or below the undervoltage threshold, DOUT outputs a steady stream of logic 0s. If the common-mode input voltage exceeds the overvoltage detection level, it outputs a steady stream of logic 1s.

How does the TPA8101 handle full-scale input signals?

When a full-scale input signal is applied, the device generates a single one or zero every 128 bits at the DOUT output, depending on the polarity of the input signal, allowing the system to distinguish between valid data and saturation.

What are the recommended power supply decoupling practices?

Place a 0.1-μF bypass capacitor as close as possible to the VDD1 and VDD2 pins. Additionally, using a 1-μF to 10-μF capacitor can provide better filtering for the respective power domains.