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OPA1678: opa1678 OUTPUT （ Automotive Audio）

Hongcheng Wu
Prodigy 60 points
Part Number: OPA1678

We have use  OPA1678 for  Automotive Audio. We want a Frequency Response of MIC as follow :

But ,the actual Frequency Response as follow:

Our  schematic diagram as attachment .  Please check it for us ,Thanks !  Please suggest how to debug OPA1678 - DEMO.pdf

  • 0
    Guru 140200 points
    Hi,

    add a power supply decoupling cap to U2, replace L5 and L2 by a short circuit and remove the short circuit between the output of circuit and VCC. Remove C6 and replace it by a resistance.

    What role plays R6 in your circuit? This resistance is not necessary when an electret microphone is connected. Have a look at figure 39 of datasheet. Do also remove C10.

    Kai