Besides from ADG4612. Can you suggest any alternatives? It needs to support 3.3V single supply.
Our latest fault protection switches are the ADG54XXF and ADG52XXF families.
The ADG5412F is a 4 channel version that features:
If you have any questions about this device please do not hesitate to ask.
I don't have access to schematic drawing tools right now, but here's the high level diagram:
Note: Purple devices are depletion mode FETs. When the power is OFF they turn on and allow the signal to pass through the original path. When the power is ON however, signal input and output is routed to MCU. Also the volume knob is disconnected from the signal path and first pin is connected to a HIGH pin and second pin is read by ADC. Biasing, decoupling, band filters etc are all omitted.