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OPA858DSGEVM: OPA858DSGEVM

el bouanani yassine
Prodigy 20 points
Part Number: OPA858DSGEVM

Bonjour, j'utilise la carte d’évaluation OPA858DSGEVM pour amplifier mon signal qui est issu d'une autre carte evaluation d'un capteur SiPM, malheureusement je trouve un gain de 1 au lieu d'un gain de 7 dans la configuration non inverseur. je vais expliquer comment je câble la carte d’évaluation ( pour les alimentations j'utilise VCC= 2,5v et VEE= -2,5v) , mon entrée cable sma qui sort du capteur et il rentre sur le pin J2 (IN+) pour le pin IN- je mets rien car dans la datasheet il est connecté a la masse via R3. merci pour votre aide svp?  

  • 0
    Guru 140200 points

    Traduit par google:

    Hello,

    I am using the OPA858DSGEVM evaluation board to amplify my signal which comes from another evaluation board of a SiPM sensor, unfortunately I find a gain of 1 instead of a gain of 7 in the non-inverting configuration . I will explain how I wire the evaluation board (for the power supplies I use VCC = 2.5v and VEE = -2.5v), my sma cable input which comes out of the sensor and it goes into pin J2 (IN +) for the IN pin - I put nothing because in the datasheet it is connected to ground via R3. thank you for your help please?

  • 0 in reply to kai klaas69
    TI__Genius 15555 points

    Thanks for the translation Kai!

    El Bouanani,

    Can you share what sensor you are using here? Specifically what is the output impedance of the sensor?

    Also are you accounting for the loss in gain from the output voltage division? (Assuming you are using a 50-ohm measurement device).

    Best,

    Hasan Babiker