ISO 124 From Single Supply

John Palombini

Other Parts Discussed in Thread: ISO124, AMC1200

Is it possible a single +5V supply on the ISO124 by connection VS1- to GND1 and VS2- to GND2 and their respective supplies to +5V, when the input is limited to 0-5V?

over 14 years ago

0 Bruce Trump over 14 years ago

Guru 21975 points

John,

Sorry, but no, the ISO124 cannot be operated from a single 5V power supply. A minimum total of 9V is required between -Vs and +Vs.

Regards, Bruce.

0 John Palombini over 14 years ago in reply to Bruce Trump

Prodigy 30 points

Bruce-

Can we tied -Vs to GND and apply 12V from the -Vs/GND to +Vs?

0 Bruce Trump over 14 years ago in reply to John Palombini

Guru 21975 points

Yes but you will have very limited signal swing. This is not a rail-to-rail device. Typical input and output swing performance is 2.5V to each rail so you might get reasonable performance with signals from 2.5V to 9.5V. Tested and assured performance is 5V to the rails (a conservative rating), or 5V to 7V.

Regards, Bruce.

0 John Palombini over 14 years ago in reply to Bruce Trump

Prodigy 30 points

Interesting. Can you suggest a device that would is better suited for this type of application?

0 Arek Spring over 13 years ago in reply to John Palombini

TI__Intellectual 2700 points

Hello John, we've got the AMC1200 in development - this is an isolated 5V opamp with a fixed gain of 8 and an input voltage range of +/-250mV. Feel free to contact me directly in case of interests: arek@ti.com.

BR, Arek

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ISO 124 From Single Supply