The reference current in some converter architectures depends on the DAC code that has been preprogrammed.
This code-dependent reference input current, which ranges from a few microamps to about 2 mA, is frequently disregarded. In fact, a reference input may seem to the reference source as a fluctuating load. The voltage loss via the copper traces can dramatically lower a DAC's performance when an external reference is provided. The use of a 4 wire sensing circuit should thus be taken into consideration since the voltage drop is not a set voltage but instead fluctuates with code. There is a 4-wire connection option for the ATX7006 reference DAC. The reference input pins of the device should be in close proximity to the positive and negative sense lines, or, in some cases,
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