AD8045
Production
The AD8045 is a unity-gain stable voltage feedback amplifier
with ultralow distortion, low noise, and high slew rate. With a
spurious-free dynamic range...
Datasheet
AD8045 on Analog.com
Hello at all
i would like to know if there is an issue with the spice model of the ADA4805 or just something i do not understand correctly in the datasheet.
With condition given in the datasheet:
The Output should be able to have an output swing of:
But the Spice model shown here: (simple voltage follower, no load or other tricky things)
is showing a significant gap between input and output (beginning at about 2.5V).
Supply voltage is 3.6V so there is more than enough headroom i think.
Could you please check this behaviour of the model?
Is that just a model issue?
--> The ADA4805-02EP is foreseen as a key component of a new design (space application) and it is the only Opamp that fullfill all requirements.
Thank you for your support!
Tino
Hello Tino,
you're focussing on the output common mode range. But the ADA4805 also has an input common mode limitation, which causes the effect you observe:
Therefore the full output range cannot be used with a voltage follower (Gain=1), cause the input common mode range would be violated.
best regards
Achim
Hi TinoKaufmann ,
Kindly refer here for the input common mode range of the part. We do not recommend exceeding this range.
I tried a gain of 2 by using a 2V input, 3V supply. You can refer below for the output swing.
Best regards,
Gio
