Hi team,
My customer has an headphone application using TPA6132A2.
The input signals are the denoise differential signal and single-end audio signal.
My question is that can the single-end audio signal be added to the denoise differential signal, then be inputted to TPA6132A2 together? And do you have reference design?
thanks a lot.
Best regards,
Yang
Hi Yang,
You could try to connect the single-ended signals in a conventional summing configuration, like the below:
Although you need to evaluate the performance of this configuration as this is not tested on this device.
If this does not work, you may need to add a previous op amp buffer in summing configuration.
Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators
Hi Ivan Salazar,
The input signals are not only single-ended audio signal.
The input signals are included denoise differential signal and single-ended audio signal.
TPA6132A2 embedded resistor array.Do you have the value of the embedded resistor array?
I just want to superimpose the differential signal and the single-ended signal ， then output the single-ended signal. How do I design? Do you have a design reference?
Best regards,
-Harly
Hi Harly,
The input impedance (input resistor) is given in data sheet section 6.6 for each gain level.
Summing a differential and a single-ended signal would be as below diagram:
Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators
Hi Ivan,
Thanks a lot.
If set the gain level to 0dB,is it OK that set Ri1=Ri2=20KΩ,Ci2=1 uF?
The differential inputs in your diagram don't have capacitance，is it necessary to add Ci1=1uF ?as below diagram:
Best regards,
-Harly
Ivan，
OK.If my new project choice TPA6132A2 ,after testing,I will tell you the result.
Summing a differential and a single-ended signal TPA6132A2 ,in that diagram ,Why the single-ended signal connect to IN-?In a addition amplifier,the output=sum(IN+ ) - sum(IN-).Is it better that connecting the single-ended to IN+?
Best regards,
-Harly
