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TPA2012 Figure 33. Typical Application Circuit question

Chen Bogey8
Mastermind 9990 points


Dear Sir

we have reference Figure 33 to design, from DAC output have connect R/C(it should be low pass circuit. right?). but datasheet have no show reference value.

May we know what is reference R/C value?

May we check what is table 1 function? i find different gain correspond different RI. here RI is mean Figure 33 "R"?

And another question I check TPA2012 EVB Ci value is 1uF but datasheet Figure 33 Ci is 0.1uF, If I want to modiy EVB to Figure 33. Is Ci need change?

 

                                   Best regards

                                                  Bogey

 

 

  • 0
    TI__Expert 3350 points

    Bogey,

    Table 1 gives you the input resistor value for each gain setting.  Select your desired gain setting, then use the value Ri to determine the input cap value.  Use equation 2 on page 12 to calculate the input cap value based on Ri (from table 1) and fc (the desired roll off frequency).  In the case of the EVM, you do not need to change the value of Ci, unless you want to change the filter roll off frequency.

     

    Regards,

    royce

  • 0 in reply to Royce Higashi
    Mastermind 9990 points

    Dear Royce

     

    I got it and many thanks~~~

     

                                 Regards,

                                             Bogey