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DRV8412DDWEVM: Hello i wonder about drv8412 evm current

Part Number: DRV8412DDWEVM
Other Parts Discussed in Thread: OPA2350

Hi , i'am using  drv8412evm rev.g -> dual dc or step motor driver

When i test about this evm , i wondered about current sensing of motor phase

i attatch the schematic.

I know IA-FB ~ ID-FB is current feedbacks used by OPA2350EA

below, i have a some question Pleas, reply so detail as you as possible

1. in the schematic OPA2350 VCC & VEE don't appear what is the power supply about OPA2350 and did it working as Differntial amp??

2. How to Calculate about realtime Current?(Please example calculation Ex, Busvoltage24V and sample current 4amphear ) and what is the OPA2350 Gain? and DC Bias 2.5V voltage?

3. I dont  understand R26/R54/R35/R30/R64 work? how to use that for make to gain? or DC Bias? calculate please(i think that chips operate as Low side motor current sensig) 

I don't good at making english sentences , please Reply THankyou!