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Sink/source current DAC eases testing

Posted: 13 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DAC? testing? current?

Maxim Integrated Products has introduced the DS4432 low-cost, dual-channel, sink/source current DAC. This I?C-controlled, 7bit current DAC features two output channels designed for power-supply margin testing and adjustment.

Each output channel provides fine control of a DC/DC power supply by sinking or sourcing current directly into the power supply's feedback node. The DS4432 offers lower full-scale current and higher resolution than legacy sink/source current DACs, thus expanding the range of existing DC/DC power supplies that can be margined and adjusted with minimal redesign. The DS4432 is ideal for servers, routers, switches, video processing cards and other DC/DC power-supply applications requiring system-level voltage control, calibration and margin testing.

Maxim's new DAC powers up in a neutral (zero-current) output condition to minimize system-startup overhead requirements. The full-scale output currents are set between 50?A and 200?A using one external resistor for each channel. Through the I?C bus, the output currents can then be set to any of the 127 linear sink or 127 linear source steps up to the maximum full-scale value.

The DS4432 is fully specified over the -40C to +85C extended industrial temperature range and is available in 8-pin ?SOP. Pricing starts at $0.45 (10,000-up, FOB USA).





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