Article Consider an ATE driver IC, such as the MAX9972, with drive current that is more than ±40mA. Which voltage rail supplies the current? DLV/DHV/DTV (used to set voltage of DUT) or VDD/VSS (power-supply rails)?

The source/sink current (±40mA) out of or into the driver is provided from the VDD/VSS supplies respectively. The DLV/DHV/DTV input levels are simply low-current voltage references for sourcing or terminating the driver to a particular voltage. The driver can be considered as a high-speed switching amplifier that provides preprogrammed, buffered voltages.

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