The OP AMP model for step downing AC voltage for ADC of uc

[afridii]

i read this blog **broken link removed**
to use uc for determining the AC voltage value (rms). the first step is to step down the AC voltage to the TTL level using OP AMP
and the above blog suggested the OP AMP circuitry



so i need to know which model of OP AMP i should use. I think it is a simple DC gain amplifier application only rating has to be considered. but i am still not sure as i am new in op amp application,
kindly someone help.

regards

 

[crutschow]

You need a rail-to-rail type, general-purpose op amp. What is your supply voltage?

Note that TTL refers to digital signal levels, not analog.

 

[akhilpaulv]

i read this blog **broken link removed**
to use uc for determining the AC voltage value (rms). the first step is to step down the AC voltage to the TTL level using OP AMP
and the above blog suggested the OP AMP circuitry



so i need to know which model of OP AMP i should use. I think it is a simple DC gain amplifier application only rating has to be considered. but i am still not sure as i am new in op amp application,
kindly someone help.

regards

what is meant by 'uc'

 

[afridii]

You need a rail-to-rail type, general-purpose op amp. What is your supply voltage?

Note that TTL refers to digital signal levels, not analog.

i know that TTL is digital but from that i mean that it is better that i use extreme values of built in ADC of the microcontroller(uc) 0v to 5v. the voltage is 220 volt rms that i will use to determine. i am using atmega8535 uc in this application



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what is meant by 'uc'

uc means microcontroller

 

[ZekeR]

I think the LMV324 should work for you. See here: https://www.ti.com/lit/ds/symlink/lmv324.pdf