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TLV320AIC32 line outputs as single ended

Greg10135
Prodigy 170 points

Other Parts Discussed in Thread: TLV320AIC32

Hi,

We currently use one of the the TLV320AIC32 line outs to modulate a transmitter. At the moment, only the LEFT_LOP is capacitively coupled to the transmitter, with the LEFT_LOM left unconnected.

I would like to extend the response of the transmitter down to DC (by removing the coupling cap). Would it be acceptable to directly connect only LOP to a load? The TLV320AIC32 doesn't give any information on the topology of the line output driver.

Regards,

Greg

  • 0
    TI__Mastermind 28585 points

    Hi Greg,

     

    The DAC32 outputs will work down to DC however no testing is done on DC performance. Specs such as offset, INL, DNL, monotonicity and such are not tested. You will have to decide if the performance is suitable for your application. If these specs are important to you, you might want to look at one of our many industrial DAC's.

     

     

  • 0 in reply to Converter Apps
    Prodigy 170 points

    Hi,

    Thanks for your response, and I will definitely consider an industrial DAC next time. For now, we are trying to and add a new feature to existing hardware.

    Putting the limitations of the device aside, is there a "best-way" to use only the positive output from the line outputs when driving a DC load? Without knowing the topology of the output driver, I am unsure of the arrangement which will achieve optimum output voltage and noise level.

    Regards,

    Greg

  • 0 in reply to Greg10135
    TI__Mastermind 28585 points

    The line outs are specified for loads of 10 k or greater so you might want to buffer the output if your load is too high. Aside from that, it should be fairly straight forward. The output common mode is programmable and the output range will be centered on the common mode voltage you choose.