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Q: TPA6130A2 and GLB
I am interested in design of a TPA6130A2 however have a few questions I hope you can help with.
(1) We are unsure if/how to include a ground loop break resistor with the TPA6130A2. I have read Application Report SLOA143 but this mentiones SGND (signal ground) reference and as you are aware the TPA6130A2 has a charge pump GND and analog power GND reference. My guess would be the analog power GND but is that correct?
(2) Why does Ti offer voltage and current audio DAC's? Is there a benifit with either choice for audio applications?
(3) Is it generally recommended to filter a DAC o/p before or after the amplifier (eg TPA6130A2) in an audio application?
(4) Would the O/P volume of the TPA6130A2 be dependant on the supply VDD = 2.5 V to 5.5 V range? assuming a fixed volume has been programmed.
(5) Are there any recommended app notes or other documentation covering audio quality or how to avoid potential noise issues?
Thanks in advance for your help.
A: Re: TPA6130A2 and GLB
1) Yes, AGND should be fine.
2) Voltage DACs are typical for most audio applications. We do offer current DACs that are higher performance and allow the customer greater flexibility given more complex output circuitry.
3) Filter the DAC output before the amplifier.
4) Vdd does not affect output power as long as it's not clipping.
5) The following may be able to help you:
and SLOA143 of course.
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