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Audio DAC plus Audio amplifier Availability

Justin Thomas
Prodigy 100 points
Other Parts Discussed in Thread: PCM5102-Q1, OPA1641, OPA827

Hi,

We require an audio interface capable of providing 7.75Vrms to 2K ohm load.

Can someone suggest a Audio DAC plus Audio Amplifier combination supporting the above interface. The temperature grade should be from -40 to 105C.

The audio DAC digital interface will be I2S.

Thanks

Justin

  • 0
    TI__Guru**** 189401 points

    Hi, Justin,

    My colleague will respond to your questions soon.

    -d2

  • 0 in reply to Don Dapkus
    TI__Expert 8505 points

    Hi Justin,

     

    Thanks for choosing the E2E! Regarding the parts you are looking for, here is my recommended solution:

     

    PCM5102-Q1

    Operating temp range: -40 to 105C 

    TI page: http://www.ti.com/product/pcm5102-q1

    Input: I2S

    There is also EVM board for the part orderable from our online store, which you can use to evaluated the performance: http://www.ti.com/tool/pcm5102evm-u

     

    OPA1641

    Operating temp range: -55 to 125C

    TI page: http://www.ti.com/product/pcm5102-q1

    It has Excellent THD+N with 2kOhm load, and has maximum output voltage at 12.7 Vrms.

     

    Please let me know if you have any other questions. Thanks!

     

    Regards,

     

    Brian Wang

                   

  • 0 in reply to Brian Wang
    Prodigy 100 points

    Hi Brian,

    Thanks for your response and suggestions.

    I would like to know where in the datasheet of OPA1641 it is mentioned that the output can drive 12.7Vrms in to a 2KOhm load. Please help me on this.

    Also in the datasheet it is mentioned that OPA1641 is specified from -40 to +85C. Does this mean that beyond 85C the device can malfunction. Anyway in the absolute maximum ratings the operating temperature is -40 to 125C.

    Thanks

    Justin

  • 0 in reply to Justin Thomas
    TI__Expert 8505 points

    Hi Justin,

     

    Outside of the absolute maximum ratings, the part may malfunction, whereas outside of specified range the part may not meet the specs defined in the electrical characteristics.

    Take a look at the OPA827 (http://www.ti.com/product/opa827), which has a specified range over -40 to +125C. The output can drive up to 10.6Vrms. This is because the output can swing from (V-) + 3 to (V+) -3, which is -15V to +15V max, which is Vpp/2/sqrt(2) = Vrms = 10.6V.

     

    Please let me know if you have further questions. Thanks!

     

    Regards,

     

    Brian Wang