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Can TP2016D2 Differential input be driven single ended?

Wilbur Harvey
Prodigy 70 points
Other Parts Discussed in Thread: TPA2016D2

Can the differential inputs on the TPA2016D2 be driven single ended.

I would presume to tie the negative input to ground through a 1uf capacitor as if it were driven from the negative output from a coded.

I am using a Realtek ALC268 codec, which only has single ended outputs, and I don't want an extra amplifier to convert the single ended output to differential.

  • 0
    TI__Mastermind 18510 points

    Your presumption is correct.  To drive a differential input in an amplifier like TPA2016D2 from a single-ended source, connect one side of the input to the source through an input cap and connect the other side to ground, at the source, through a second cap of the same value.

    The reason to connect to ground at the source, rather than at the amplifier, is to use the CMRR of the differential input to reject any ground noise or other interference between the source and the differential input.  You don't need to make the source differential to gain this advantage.

    The reason to make both caps the same value is to eliminate a possible cause of turn-on/off pop.  If the caps aren't equal in value, they may charge at different rates on turn-on/off and create a net voltage at the differential input which is heard as a pop when the amplifier turns on/off.  We encourage using 5% caps made of X5R or better material (materials like Y5V are not very stable versus temperature or applied voltage).

    Best regards,

    Steve Crump.