Dear engineer zone member,
I want to use the ADA4940 in my design, but I have some questions.
The maximum supply voltage is 8V. I would like to use the part on ± 3.3V, so this should
not be a problem am I right? Do the specifications for the disable pin still stay the same?
Disabled ≤ -Vs +1V so ≤ -2.3V
Enabled ≥ -Vs +1.8V so ≥ -1.5V
By the way, who has made the choice to disable the device with -Vs!
Al my components in my chain, most of the from analog and also dual supply,
work with positive 0V or 3.3-5V disable pin levels. Only this chip needs -Vs level! :-(
So to work around this problem, can I put a pulldown resistor to the negative voltage supply pin (-3.3V),
so that the part is always disabled, and enabled when I put an 0V or 3.3V signal on the disable pin?
Or has someone else a better idea? I don't have any place for an level converter.