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14.4V ground reference for ADC
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wraper:

--- Quote from: Arjunan M R on May 20, 2019, 03:09:29 am ---Because +18V is the common supply voltage for everything in this schematic I noted +18V as VCC as I said this is not the full schematic.

--- End quote ---
VCC is not common voltage. It literally means "Voltage Collector Collector" and was used for describing positive supply of logic/digital ICs. Modern digital ICs no longer use BJT transistors but MOSFETs so it became VDD (Voltage Drain Drain) but VCC is still commonly used along with latter. Naming 18V supply as VCC is counterproductive, especially if other people will see your circuits.
Arjunan M R:

--- Quote from: wraper on May 20, 2019, 03:54:58 am ---
--- Quote from: Arjunan M R on May 20, 2019, 03:09:29 am ---Because +18V is the common supply voltage for everything in this schematic I noted +18V as VCC as I said this is not the full schematic.

--- End quote ---
VCC is not common voltage. It literally means "voltage common collector" and was used for describing positive supply of logic/digital ICs. Modern digital ICs no longer use BJT transistors but MOSFETs so it became VDD (Voltage Drain Drain) but VCC is still commonly used along with latter. Naming 18V supply as VCC is counterproductive, especially if other people will see your circuits.

--- End quote ---
Sorry I don't know that :(.so I will rename 18V as +18V and 5V as VCC :D
Arjunan M R:
The nice thing about the current sense amp(LT6105) is that its common mode input voltage can be higher
than its supply voltage. :-+
Arjunan M R:
Right I decided to use a 100m \$\Omega\$ 25W 1% current shunt. :D
Simon:

--- Quote from: Arjunan M R on May 20, 2019, 05:44:51 am ---The nice thing about the current sense amp(LT6105) is that its common mode input voltage can be higher
than its supply voltage. :-+

--- End quote ---

That is the whole point of using a current sensing amp like I was trying to explain. While they are opamps they are specifically designed to do this will do what a regular opamp will not.
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