Author Topic: ADC input 0..20mA 0..10V protection circuit  (Read 246 times)

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Online lk.dgironiTopic starter

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ADC input 0..20mA 0..10V protection circuit
« on: May 16, 2024, 09:56:25 am »
Hello,

I'm building a dual purpose 0..20mA 0..10V to 0..5V circuit to connect sources to ADC.
It also features protection.

I've simulated it and it seems to work correctly.
I'm not sure about filters cap, they should go up to 10k without problems.
R6 will be 51k + 2k2 in real implementation, and R2 will be 500.
Also the opamp MCP6001 or dual or quad version depending on how many input I need.
It is designed to be attached to a ADS1115, so I think I'll go for MCP6004.
Simulated diode are BAS40, I think I'll go for BAS70.
Attached the LTSpiece simulation source and and a simulation image.
Do you have any suggestion?

 

Offline S. Petrukhin

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Re: ADC input 0..20mA 0..10V protection circuit
« Reply #1 on: May 16, 2024, 11:41:46 am »
I will join the question and add a little bit: please advise specialized input chips 4..20, 0..10?
And sorry for my English.
 

Online lk.dgironiTopic starter

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Re: ADC input 0..20mA 0..10V protection circuit
« Reply #2 on: May 16, 2024, 11:49:29 am »
Do you mean changing the post title?
Indeed one of the suggestion was about the op amp to be selected.
 

Offline S. Petrukhin

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Re: ADC input 0..20mA 0..10V protection circuit
« Reply #3 on: May 16, 2024, 11:55:47 am »
Do you mean changing the post title?
Indeed one of the suggestion was about the op amp to be selected.

No, no. The topic is the same, maybe someone knows a ready-made solution. Those answering your question may know the CHIP that is ready for use.
And sorry for my English.
 

Online lk.dgironiTopic starter

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Re: ADC input 0..20mA 0..10V protection circuit
« Reply #4 on: May 16, 2024, 12:00:46 pm »
Ok! Now I get it :)
 


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