Output swing of OPA859-Q1 when Operating from Single 3.3V Supply
I am using OPA859-Q1 in one of my applications. It's supply voltage is 3.3V,single supply operation.I am confused about is output swing when operated from 3.3V supply
Is the maximum swing is 2.4V when operated from 3.3V Supply.Below table is from datasheet '6.5 Electrical Characteristics'
2 answers
The following users marked this post as Works for me:
| User | Comment | Date |
|---|---|---|
| newbie |
Thread: Works for me I received my answer and it is perfectly understandable. |
May 31, 2025 at 15:34 |
In section 6.5 of the data sheet is the snippet of the table you put in your question but, you possibly failed to read the default words at the top of the section: -
$V_{S+} = 5 V, V_{S-} = 0 V$
This is the default power supply and, to get an output voltage of typically 4.1 volts, you need a supply of 5 volts. However, if $V_{S+}$ is only 3.3 volts then the typical output value will be 2.4 volts.
Andy already gave you a direct answer, but I want to point out a confusion:
Is the maximum swing is 2.4V when operated from 3.3V Supply.
Maximum output voltage and maximum output swing are not the same. Swing refers to the range. With a 3.3 V supply at 25°C, the guaranteed output voltage range is from 1.15 V to 2.3 V. That means the guaranteed swing is only (2.3 V)-(1.15 V) = 1.15 V.
This opamp is not very useful with only a 3.3 V supply.
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