Hey all,
I am looking for some design guidance on on DACs & I2C.
I am designing a circuit which includes two DAC & Amplifier subcircuits, we can call it 5V_DAC and 24V_DAC.
Both of them use the MCP4725AOT DAC which does not have an enable pin.
They both rely on the SCL and SDA signals from an esp32 to generate their waveforms.
I want both of the 5V_DAC and 24V_DAC to be able to communicate on the I2C lines but I don't need them to both operate simultaneously and I would like to completely isolate one while the other is in operation.

Currently i'm thinking of using a TCA9548A I2C Switch but then I have to find a way to deal with the input and output power of the DAC that is not selected. Any suggestions?

 

Switching the power off and on does not seem like a reliable effective way to chose A/D converters. It is also not clear why they both can not stay active, and simply read the data from the desired A/D as you choose.
OR, are yo monitoring a single line with different voltages.??

 

Why are you worried about the power it consumes? If you select "power down" it only uses 60nA.

 

fyi, that dac is not recommended for new designs, so fine to play with, but may be not use in production unless there is a pin for pin substitute.
https://www.microchip.com/en-us/product/MCP4725

also , that part has an A0 input, tie one A0 high, the other chip A0 low , and then they have separate i2c addresses you can access independently,