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This slide introduces op amp specifications. The top of the specification table is
the test conditions for all the parameters in the data sheet. In this example, the
temperature is 25 °C, the load resistance is 10k Ω, the load is connected to mid
supply, and the common mode voltage is set to mid supply. These conditions are
true unless otherwise specified. If you look at the offset voltage specs, it lists some
additional conditions. The supply voltage is +/-15V and the common mode voltage
is 0V.
Note that we have a typical and a maximum specification. The value listed in the
typical specification will cover ± one standard deviation, or ± sigma, on a Gaussian
distribution. This means that 68% of the device population will be less then the
typical value. So, in this example, 68% of the devices would have less then ±75 μV
of VOS. The maximum is a tested value, and so you will never find a device with
greater than the maximum VOS of ±150 μV .
We also have a VOS drift specification that is measured in μV/°C, describing how
VOS changes with temperature. In this case, the typical drift is given as 0.1 μV/°C.
The maximum drift is given as 2 μV/°C.