What is the best way to isolate ADC inputs from one another?
I have an application where I need to measure voltage from different systems with different GND levels that I would like to keep isolated. Whats the best solution for this? I have been looking at the linear opto isolators like the LOC110 but have no experience with their linearity. Can differential amplifier op amps be used in this situation?
Voltages that I need to measure are in the 48v range.
Thanks for the reply. Can you show me examples or a schematic on how to do it? Im new to these stuff. Most that ive searched for buffers are for full differential adcs and im using a single ended adc.
Also, hwo do i make the adc read the voltage even if the source is reversed? Similar to DMMs showing negative numbers?
I can get you to the basic ADC circuit schematic simulated in PROTEUS & the asm code. Do the same procedure with PIC18F4620 by reffering its data sheet & do try to make up the ADC circuit.
Do check the code & schematic in PROTEUS.
Regards,
Jerin.
Another option is to build small, single-channel ADC blocks that are fed through isolated dc/dc converters and “talk” to them via normal optocouplers .. 3-wire or I2C ..