high voltage ADC Circuit

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engallam

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I want to build analog to digital circuit with 100 volt as reference volt
I tried to use R/2R circuit , it work will but with input volt (100v)
Now I want to control by microcontroller
How I can to do it ??
 

Hi,

Use two resistors as voltage divider.
This is all I can recommend because you don't give much infirmation.

Klaus
 

Why not use a low voltage DAC and amplify its output with a high voltage amp?
That would be a lot easier.
 

crutschow said:
Why not use a low voltage DAC and amplify its output with a high voltage amp?
That would be a lot easier.
Click to expand...

How do I do that? I tried, but all my attempts were doomed to fail. The maximum voltage I got is 30 volts.
 

engallam said:
How do I do that? I tried, but all my attempts were doomed to fail. The maximum voltage I got is 30 volts.
Click to expand...
You just need a high voltage op amp and a high voltage supply.
You could use the LTC6090 for example.
It can generate a 0-100V output from a 0-5V input with +100V and -5V supply voltages by using a non-inverting gain of 20.
See Ltspice simulation below:

 


Ltc6090 opamp not valiable in our sity .. So if you have any idea to amplife it using transistors like BUX84 .


Thanks alot
 

Hi,

Please clarify:
Do you want an ADC circuit or a DAC circuit?

I read "ADC" ... but why using a high voltage Opamp then?

Klaus
 

If you are doing an ADC, why not just attenuate the voltage to what the ADC can handle?
 
Last edited:

KlausST said:
Hi,

Please clarify:
Do you want an ADC circuit or a DAC circuit?

I read "ADC" ... but why using a high voltage Opamp then?

Klaus
Click to expand...

Sorry r2r DAC Not ADC
I don't know how edit the post

- - - Updated - - -

crutschow said:
If you are doing an ADC, why not just attenuate the voltage to what the ADC can handle?
Click to expand...



Sorry r2r DAC Not ADC
I don't know how edit the post
 

Hi,

before designing an amplifier you should give some informations:
* frequency range
* maybe settling time
* output current

Other requirements, like:
* noise
* size
* cost
* power supply
* load behaviour (pure resistive, or complex)
* you need push/pull or is high side drive sufficient?
* part availability
...

Klaus
 

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