now I’m using ad1832 as an unbalanced to balanced headphone amplifier.
although these usage is not recommended, I found this device reproduce
hi-end quality sound. (great!) but I can’t reject EMI. when I move smartphone close to it,
output heavy noise. (2.4GHz ,5GHz both) almost all countermeasure are taken
such as grounding, shielding, decoupling.
is there any other countermeasure or is there any other full differential device to
recommend which has high EMRR and works arround 3.7V power supply voltage?