Dear All,
I am working at a new design wich involves a TLV320AIC3254. I need implement galvanic isolation on the audio lines. In my searches realized that the solution could be the one I describe here below but I would like to collect the opinion of some audio expert, maybe regarding the availability of different solutions which possibly involves some TI device for this pourpose.
1) Line Output (LOR, LOL). Since this signal drives an high input impedence amplifier (TPA6211A) I can achieve galvanic isolation with a 220nF, 2KV coupling capacitor;
2) Headphone output (HPR, HPL). Here I used this signal to drive a 1:1 (600ohm) audio transformer;
3) Microphone (INx_R, INx_L). Since the electrect microphone signal is very low, I used a single opamp, unbalanced, pre-amplifier to drive the primary of a 1:1 audio transformer. The signal on the secondary coil is routed to the codec input.
Thank you in advance.
