# cn-0209

Hi,

I need to design a universal analog input module .I have referred to CN-0209.But I could not understand the purpose of ADG442 used in the circuit.Can I get help?

Regards,

Divya

Parents
• Hi,

My maximum input is ±10V.I am planning to take the output from AD8275 to an Arduino Due board(the maximum voltage that its input pins can handle is 3.3V).I am not planning to use AD7193.Sorry Sir,I could not get your point in your previous post.

2. If the above attenuation circuit is used from where will I generate 2.5 V?

3. Can the same circuit of CN-0209 be used(till AD8275) but ,how can I scale down the output of AD8275 to below 3.3V.The output of AD8275 can      be varied by changing its reference voltage,right?If so,the required reference has to be generated by REF194,right?If I use REF198 I can get an      output of 4.096V,which when used as the reference for AD8275 gives output of 2.048V which would meet my requirements.But then how will I      generate the 2.25V which is to be given to AD8617?

4. Or is it advisable to use a resistive divider at the output of AD8275 so as to bring down its output to less than 3.3V.In this case the circuit need      not be modified,just it involves the addition of a resistive divider,right?

5.Also, can I know the PCB board size used for CN-0209 circuit?

Regards,

Divya

• Hi,

My maximum input is ±10V.I am planning to take the output from AD8275 to an Arduino Due board(the maximum voltage that its input pins can handle is 3.3V).I am not planning to use AD7193.Sorry Sir,I could not get your point in your previous post.

2. If the above attenuation circuit is used from where will I generate 2.5 V?

3. Can the same circuit of CN-0209 be used(till AD8275) but ,how can I scale down the output of AD8275 to below 3.3V.The output of AD8275 can      be varied by changing its reference voltage,right?If so,the required reference has to be generated by REF194,right?If I use REF198 I can get an      output of 4.096V,which when used as the reference for AD8275 gives output of 2.048V which would meet my requirements.But then how will I      generate the 2.25V which is to be given to AD8617?

4. Or is it advisable to use a resistive divider at the output of AD8275 so as to bring down its output to less than 3.3V.In this case the circuit need      not be modified,just it involves the addition of a resistive divider,right?

5.Also, can I know the PCB board size used for CN-0209 circuit?

Regards,

Divya

Children
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