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Q&A Using split CT termination for better THD performance

In the ADS131M02 datasheet, there is a following schematic snapshot for interfacing the ADC differential input channel with the Current Transformer: Furthermore, Two identical burden resistor...

2 answers · posted 2d ago by 2kind‭ · last activity 6h ago by Olin Lathrop‭

Question ADC current-transformer THD

#2: Post edited by

Nick Alexeev‭ · 2025-04-02T21:59:37Z (about 20 hours ago)

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In the ADC datasheet([link](https://www.ti.com/lit/ds/symlink/ads131m02.pdf?ts=1743451691530&ref_url=https%253A%252F%252Fwww.mouser.de%252F)), there is a following schematic snapshot for interfacing the ADC differential input channel with the Current Transformer:
![ADS131M02 CT Interface](https://electrical.codidact.com/uploads/97sz2hi4st5ngn0ydf7x0fvtsejk)
Furthermore,
> _Two identical burden resistors in series are used with the common point being connected to GND instead of
using one burden resistor for best THD performance._
How does this work - how does it improve THD performance?

In the [ADS131M02 datasheet](https://www.ti.com/lit/ds/symlink/ads131m02.pdf), there is a following schematic snapshot for interfacing the ADC differential input channel with the Current Transformer:
![ADS131M02 CT Interface](https://electrical.codidact.com/uploads/97sz2hi4st5ngn0ydf7x0fvtsejk)
Furthermore,
> _Two identical burden resistors in series are used with the common point being connected to GND instead of
using one burden resistor for best THD performance._
How does this work - how does it improve THD performance?

#1: Initial revision by

2kind‭ · 2025-04-01T16:13:42Z (2 days ago)

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Using split CT termination for better THD performance

In the ADC datasheet([link](https://www.ti.com/lit/ds/symlink/ads131m02.pdf?ts=1743451691530&ref_url=https%253A%252F%252Fwww.mouser.de%252F)), there is a following schematic snapshot for interfacing the ADC differential input channel with the Current Transformer:
![ADS131M02 CT Interface](https://electrical.codidact.com/uploads/97sz2hi4st5ngn0ydf7x0fvtsejk)

Furthermore,

 > _Two identical burden resistors in series are used with the common point being connected to GND instead of
using one burden resistor for best THD performance._

How does this work - how does it improve THD performance?

ADC current-transformer THD

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