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DAC8568: DAC8568 Grade Identification

Part Number: DAC8568

I am trying to get the grade A of the DAC8568. There are DAC8568IAPW, DAC8568IBPW, and DAC8568ICPW I want to make sure the letter difference between the names are indicating the different grade of the chip, which make DAC8568IAPW the grade A chip.