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OPA2333-Q1: Amplifier architecture

Roy Chou1
Genius 16110 points
Part Number: OPA2333-Q1
Other Parts Discussed in Thread: OPA2333

Tool/software:

Hi Team,

Is it ok to use OPA2333 to achieve below design? I am not sure if there is any side effect if use low resistance in addition to power loss.

And I think 10mV is ok for the design because the part offset voltage is ok 23uV, is it correct? (Vin >> Voffset, I am not sure if the criteria is correct or not. If yes, do you have recommended ratio for the relationship?)

Regards,

Roy

  • 0
    Guru 316860 points

    Looks OK. (With this output voltage, the output current is 100 µA.)

    The output voltage is (10 mV ± 10 µV) × 11 = 110 mV ± 0.11 mV.

  • 0
    TI__Guru 67601 points

    Assuming you power OPA2333 from 5V single supply and apply the minimum 10mV input signal, the circuit will work fine.  However, if your  maximum input voltage range is 445mV resulting in Vout of 4.9V, the  circuit would not be able to  deliver required output current  of 4.45mA  (4.9V/1100ohm) and swing within  100mV of positive rail.  In such a case I would recommend increasing your resistor values by 10x (1k and 10k).