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DAC8811: DAC8811 Vref current consumption

Part Number: DAC8811


I am using DAC8811 part and for Vref pin I have connected one reference generator IC LTC6655 to generate 5V.

LTC6655 can provide max 5mA of current. As per the DAC8811 datasheet Vref pin has resistance 5Kohm which means it will consume 1mA at 5V supply.

But output of my LTC6655 is reducing to 4.7V which i sbecause of more current consumtion,

Please provide the current requirement for Vref pin.