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Isolated AC Voltage Sensor with Analog Output

In this design, the signal from a discrete TNPV voltage divideror is fed to a VIA0250DD, a high-performance, isolated, differential output amplifier. The VIA0250DD has a linear differential input range of ±250 mV and a linear differential output range of ±2.05 V, which is converted to a single-ended output ranging from 0 V to 2.5 V (OUT to GND). This output is ready to be interfaced with a single-ended ADC or multimeter. Using the combination of a discrete voltage divider and a VIA0250DD isolation amplifier, this design provides an analog output for AC current measurement up to ±400 V rms at a bandwidth of ~ 300 kHz.

Reference

<p>Functional Block Diagram</p>

Diagram 1

Features

  • AC voltage measurements up to 400 VRMS
  • Maximum working isolation voltage of 1200 VRMS
  • Isolated single-ended analog output
  • Low temperature offset and gain drift
  • Large bandwidth of 300 kHz

Products

Isolation Amplifier: VIA0250DD

High Thermal Stability Isolation Amplifier

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Resistor: TNPV e3

High Voltage Thin Film Flat Chip Resistors

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Resistor: ACAS 0606 AT, ACAS 0612 AT - Precision

Precision Thin Film Chip Resistor Array Superior Moisture Resistivity

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Isolated AC Voltage Sensor with Analog Output | Vishay | Vishay