TPA8101-TS1R

Overview

The TPA8101-TS1R is an isolated delta-sigma modulator from 3PEAK, housed in a TSSOP8 package. 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 ±250 mV and outputs a digital bitstream via DOUT, synchronized by a CLKIN signal operating between 5 MHz and 21 MHz. Key electrical specifications include a maximum offset error of 150 μV at 25°C, a gain error of 0.15% at 25°C, and operation across a temperature range of −40°C to +125°C.

Feature Summary

• High CMTI of 100 kV/μs with 5000 V RMS reinforced isolation
• Low offset error (max 150 μV) and low gain error (max 0.15%)
• Integrated system-level diagnostics for missing high-side supply and common-mode overvoltage
• AEC-Q100 qualified variant available (TPA8101-SOAR-S)

Applications

• Industrial automation current sensing
• Motor control systems
• Power supplies

Procurement Notes

Verify the specific suffix 'TS1R' corresponds to the TSSOP8 package and tape/reel quantity of 3000 units as listed in the official order information. Confirm that the standard TPA8101-TS1R meets all required safety certifications for the target application, noting that automotive qualification is explicitly assigned to the SOAR-S variant.

Selection Notes

Select this component when high-speed digital isolation of analog signals is required with minimal DC accuracy degradation. Ensure the downstream ADC or FPGA can process the 1-bit delta-sigma stream generated at clock frequencies up to 21 MHz. Verify that the input common-mode voltage range aligns with the shunt resistor configuration in the high-side circuit.

Part Context

The TPA8101 belongs to 3PEAK's family of precision isolated delta-sigma modulators designed to bridge analog front-ends with digital processing units. Unlike traditional isolated amplifiers, it digitizes the signal directly across the isolation barrier, simplifying filter design on the secondary side while maintaining high bandwidth and accuracy.

Replacement Considerations

The datasheet lists TPA8101-SOBR (WSOP16) and TPA8101-SOAR-S (WSOP8) as related part numbers. No other direct cross-model replacements are documented in the provided source material.

FAQ

What is the fail-safe behavior of the DOUT pin?

If the high-side supply (VDD1) drops below the undervoltage threshold or if the common-mode input voltage exceeds the overvoltage detection level, the DOUT output provides a steady-state bitstream of logic 0s or logic 1s, respectively.

How does the device 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.

What are the recommended decoupling capacitor values?

A 0.1-μF bypass capacitor should be placed close to both VDD1 and VDD2 pins. Additional filtering capacitors ranging from 1 μF to 10 μF may be used for improved performance.