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Isolated DC Voltage Sensor with Analog Output

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This application is based on the VIA2000SD isolation amplifier and a CDMM voltage divider. The high voltage input (UDC to REF) is scaled down to +2000 mV (UDC to REF) using a set of CDMM resistors. This reduced voltage is then fed into the VIA2000SD isolation amplifier, which produces an isolated, amplified analog signal at its output (OUT to OUT).

The differential output signal, with a common-mode voltage of 1.44 V, is accessible via pin headers labeled OUT and OUT, allowing users to connect a differential ADC or to use it for other prototyping needs. This differential output is converted to a single-ended output, providing an output in the range from 0 V to 2.5 V (OUT to GND), which is ready to be interfaced by a single-ended ADC or multimeter.

To allow the lowest possible thermal drift, the differential to single-ended conversion stage is based on the ACAS resistor network, providing well-matched resistance values over a wide range of temperatures.

Reference Design Files

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Datasheet

This application is based on the VIA2000SD isolation amplifier and a CDMM voltage divider. The high voltage input (UDC to REF) is scaled down to +2000 mV (UDC to REF) using a set of CDMM resistors. This reduced voltage is then fed into the VIA2000SD isolation amplifier, which produces an isolated, amplified analog signal at its output (OUT to OUT).

The differential output signal, with a common-mode voltage of 1.44 V, is accessible via pin headers labeled OUT and OUT, allowing users to connect a differential ADC or to use it for other prototyping needs. This differential output is converted to a single-ended output, providing an output in the range from 0 V to 2.5 V (OUT to GND), which is ready to be interfaced by a single-ended ADC or multimeter.

To allow the lowest possible thermal drift, the differential to single-ended conversion stage is based on the ACAS resistor network, providing well-matched resistance values over a wide range of temperatures.

Reference Design Files

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Datasheet

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Functional Block Diagram

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Features

DC voltage measurements up to 1000 VRMS

Maximum working isolation voltage of 1200 VRMS

Isolated single-ended analog output

Low temperature offset and gain drift

Large bandwidth of 290 kHz

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