Maximum input voltage of op amp attenuator

Thread Starter

lauboonchong

Joined Feb 23, 2022
3
Hi all, below is my op amp attenuator circuit. The supply voltage is +5V and -5V. Is it ok to make input voltage (V1) up to +60V? The op amp i am using is OPA2727.
1772793327901.png
 

Rf300

Joined Apr 18, 2025
72
With a gain of 0.05 you might get problems with the stability of your OP-amp circuit. Most OP-amps are guaranteed to be stable down to a gain of 1. Some OP-amps (especially fast OP-amps) are only guaranteed to be stable down to a gain of 5 or 10 (look at the datasheet). The easier and safer way is to use a simple voltage divider to reduce the voltage to a value which is lower than your OP-amp supply and use the OP-amp as a simple buffer to reduce the output impedance.
 

crutschow

Joined Mar 14, 2008
38,320
With a gain of 0.05 you might get problems with the stability of your OP-amp circuit. Most OP-amps are guaranteed to be stable down to a gain of 1.
That parameter is for a non-inverting gain.
The shown circuit has a non-inverting gain of slightly over 1.
 

MisterBill2

Joined Jan 23, 2018
27,181
I would repeat the question in post #3!! WHY try to use an opamp as an attenuator?? Please explain the application that would require that arrangement.
 
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