MCP4725 has internal reference voltage which is equals to VCC:
VDD is the power supply pin for the device. The voltage at the VDD pin is used as the supply input as well as the DAC reference input. The power supply at the VDD pin should be clean as possible for a good DAC performance.
Also it needs 50mA of current:
I want to use one LM4040AIZ 4096V reference voltage as power supply for three DACs but the forward current of LM4040 is only 10mA.
So I need LM4040 to provide at least 150mA, How can I achieve that much of current with only one LM4040?
* MCP4725 and LM4040 are the only parts that I have access to.