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Input Voltage Range of Instrumentation Amplifier AD8557

Question asked by Kaos on Jul 25, 2012
Latest reply on Jul 25, 2012 by Kaos

We will drive AD8557 by Vdd=3.3V single power supply.

1)

So what is the Input Voltage Range at this time Vdd=3.3V?

3.3V-1.2V=2.1V

I think that the Input Voltage Range is 2.1V.correct?

2)

If I did the good catch, Why 1.2V?

Does it come from 2 diodes Vref internal?

 

Just now when Vdd=5V, Input Voltage Range is 0.6V to 3.8V we can confirm.

5V-1.2V=3.8V

And when Vdd=2.7V, Input Voltage Range is 0.6V to 1.5V also we can confirm.

2.7V-1.2V=1.5V

 

I think my catch from above.......

 

Thanks, Kaos

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