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Q&A AD7194: Voltage bias to thermocouple

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AD7194: Voltage bias to thermocouple

Honza281 on Sep 24, 2021

Hello,

I working on Thermocouple amplifier based on AD7194.

- 3 chanels, S-type, PT100 CJ compensation.

- ADR421 reference, 2.5V

- 5V power supply

Could I use TC voltage biasing according picture below?

/resized-image/__size/3110x1614/__key/communityserver-discussions-components-files/425/AD7194_5F00_TC_5F00_biasing_5F00_sch.png

Thank you.

Jan

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JellenieR
Sep 27, 2021 +1 verified
Hi,

May I know what's the bias voltage? Is that 2.5V as well? I think it should be fine as long as it still within the specified input range of the ADC.

Is this for new design? You may also want to…

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+1 JellenieR

on Sep 27, 2021 10:43 AM
Hi,

May I know what's the bias voltage? Is that 2.5V as well? I think it should be fine as long as it still within the specified input range of the ADC.

Is this for new design? You may also want to consider using AD7124, it contains most of the building blocks of AD7194 with internal bias voltage but it only operate up to 3.6V supply. We also have reference circuit for this for TC application.

CN0384 Circuit Note | Analog Devices

Thanks,

Jellenie
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0 Honza281 on Sep 29, 2021 8:52 AM in reply to JellenieR

Hi,

Q: May I know what's the bias voltage?

- Vbias = 2.5V

Q: Is this for new design?

- Yes

The AD7124-8 looks usable. Both IC types have aproximately same drift errors and non-deterministic errors.

Thanks,

Jan
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0 Honza281 on Sep 29, 2021 8:52 AM in reply to JellenieR

Hi,

Q: May I know what's the bias voltage?

- Vbias = 2.5V

Q: Is this for new design?

- Yes

The AD7124-8 looks usable. Both IC types have aproximately same drift errors and non-deterministic errors.

Thanks,

Jan
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