OPA2171: Negative Input

Hi Kevin,

you can do this, if you don't violate the absolute maximum ratings of OPA2171.

Kai

Hi Kevin,

I think you meant to connect V- to -12V??

Kai

Dear Team,

I would like to connect V+ to ground and V- to 12V, by this I can sense the negative input signal, right?

Or how can I deal with it?

So is because the supply voltage min=0, so I can't connect V- to 12 V?

But the supply voltage below mention can be +-18V

BR

Kevin

Hi Kevin,

Connecting V+ to GND and V- to 12V will cause the supplies to be in reverse polarity and damage the device. The total supply voltage of the condition you provided is -12V (0V - 12V).

When a datasheet says the supply voltage can be 36V (+/-18V) it means that if single supply operation is used you can use up to 36V and GND, if dual supplies are used you can use +/-18V. Where V+ is connnected to +18V and V- is connected to -18V for a total supply voltage of 36V.

However, you can use any combination of dual supplies as long as V+ - V- does not exceed 36V. For example, +16V and -20V can be used because 16V - (-20V) = 36V.

Can you please provide the supply voltages available, the input signal amplitude range (-12V to 12V?), and the output voltage range needed? I will try to recommend a circuit to give the desired results based on the info you provide.

Thank you,

Tim Claycomb

Hi Kevin,

Its been a while since we have heard anything back from you. Do you have any system voltage levels needed for the design? 

Thank you,

Tim Claycomb