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modifying cc85xx headset usage

trlowe
Prodigy 125 points

Other Parts Discussed in Thread: TPA3004D2

i'm really impressed by the HEADSET kit, great job TI'ers!

Out of the box, it transmits a stereo line-level input from the master to the slave into stereo headphones (16-32 ohms). 

i need to demonstrate the CC85xx radio capabilities to a client that requires a microphone input at the master and driving an analog amplifier at the slave.

Changing the master from line-level input to microphone input seems straightforward, custom i2c sequences to activate micbias and perhaps adjusting gain as needed.

i'm more concerned about being able to drive an analog amplifier line-level input (TPA3004D2) with the HPR/HPL outputs at the slave.   Can the HPx outputs be configured equivalent to the LOx outputs via just custom i2c sequences ?  Or will i have to make some h/w tweaks to the headset kit ? Or ... ?

Your ideas and thoughts would be gratefully welcomed!

Thanks,
ted

 

  • 0
    TI__Expert 7160 points

    Hi Ted,

    Thanks for the positive feedback!

    What's the input impedance on the TPA3004D2? I'm guessing it's a high impedance device, so the question on whether the headset is able to drive it or not is related to the headset output voltage swing. I don't see any problems driving the TPA3004D2 with the HPR/HPL outputs as they are, only the supply voltage on the headset board is only 2.1V, and with a common mode at 0.9V we have a peak-to-peak of 1.8V.

    -Kristoffer