Q: TPA6130A2EVM circuit vs datasheet

Customer has question concerning the difference of information in the TPA6130A2 datasheet and TPA6130A2EVM

1) In the datasheet on the audio input there is a .47uF cap shown, but on the TPA6130A2EVM a 2.2uF cap is used, why?

2) The resistors on the audio jacks - are they needed?

3) In the datasheet the RC filter output are not shown or listed, but they are used on the EVM they are, why?


A: Re: TPA6130A2EVM circuit vs datasheet

To answer your questions:

1) The input capacitance .47uF is the calculated minimum capacitance for a -3dB cutoff of at most 20Hz (as explained in pg 14 in datasheet). Larger capacitances can be used to improve low frequency response.

2) The resistor and capacitor on the output have two purposes: EMI and ESD protection. As far as the operation of the amplifier and audio performance goes, this filter is not needed.

3) See 2).