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Curious on OPAMP code in this mobile device

I'm a Xiaomi mi note users which claims to use OPAMP1612. Could you help check on these matters please?

- Are these chips in red circles in picture below OPAMP1612?

- And how can we verify that they are really OPAMP1612, not other models? 

- If they are really OPAMP1612, why is xiaomi using these confusing codes for this product?

Best Regards,

Sarawut A.( Xiaomi Mi note user)