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OPA350 - Vout=Vs/2?

Davide68542
Prodigy 170 points

Other Parts Discussed in Thread: OPA350

Dear Community,

I'm looking at the datasheet of OPAX350;

in section "ELECTRICAL CHARACTERISTICS" it says that "All specifications at TA = +25°C, RL = 1kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted".

What does it mean "[...] RL = 1kΩ connected to VS/2 and VOUT = VS/2 [...] "?

What is the setup of measurement referred in the datasheet?

  • 0
    TI__Guru 74561 points

    David,

    There is no internal ground in ANY op amp thus the only way test conditions the op amps can be specified must be with respect to its power supply rails.  And since all op amps can be used in dual or single supply configuration, the conditions of these tests must be equivalent of each other with respect to the supply rails used.

    Therefore, in the case of OPA350 in dual supply application, with the rails at +/-2.5V, the default conditions (unless otherwise noted) would be with the input common mode voltage, output voltage, etc. at the ground potential-thus in the middle between supplies.  However, in the case of OPA350 in a single supply application, with the rails at 0V and 5V, the default condition obviously cannot be at 0V (negative rail) but rather at Vs/2 potential (2.5V), again in the middle between the supplies, to make it equivalent to the conditions used in the dual supply configuration.