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DRV135: Driving multiple balanced line inputs

Benjamin
Intellectual 300 points

Part Number: DRV135
Other Parts Discussed in Thread: INA1650

Tool/software:

Hello. I am working on an audio installation, and I want to send balanced audio signal to 6 devices, which each have INA1650 line receivers. Please see the schematic.

My questions:

  1. Do you think it would be ok to connect all 6 devices in a chain like this?
  2. Would it also work if I have to work with unbalanced cables, essentially shorting the (-) side of all the cables to ground.

Thanks!

  • 0
    TI__Mastermind 31805 points

    Hi Benjamin, 

    Because you are using AC coupling I am not seeing an issue with your proposal. I ran two daisy chained but I can't see an issue with adding more. Since they are all DC isolated from each other. I have run two simulations as shown below with differential balanced inputs and also an unbalanced single ended input with the inverting terminal grounded. The DC bias potentials look good and I am able to pass signals with expected results as well. I have included my Tina Ti simulation to the bottom of this post. Let me know if you have any further questions. I hope this information is helpful for your application. 

    Tina Ti is a free software we provide and can be found here:

    https://www.ti.com/tool/TINA-TI

    Here is my simulation file:

    INA1650 Audio Driver.TSC

    Best Regards,

    Chris Featherstone