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LTC2662-16 some channel can't ouput

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Product Number: LTC2662-16

The customer use DAC LTC2662 to drive 5 channels LED output(From  25mA to 300mA), as they FSADJ pin CONECT REF to 5V Vcc power across 10 resister, the reference use internal . And use 24bits code words for program. When use their own c project code found out that there some channel no output. Their main MCU is STM32H745.

Is there any  c source code project for customer refer?