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DAC packs four output channels

Posted: 01 Sep 2009     Print Version  Bookmark and Share

Keywords:DAC  power supply  tracking control 

DS4426 DAC

Maxim Integrated Products is offering the DS4426, a low-cost, quad sink/source current DAC with tracking control.

The device is an I²C-controlled, 7bit current DAC with four output channels explicitly designed for power-supply margining and adjustment functions. Three of the DAC channels have additional circuitry to provide power-supply sequencing or tracking. Each output channel provides control of a DC/DC power supply by sinking or sourcing current directly into the power supply's feedback node. This technique allows existing power-supply designs to be margined and adjusted with minimal redesign, thus making the DS4426 ideal for any DC/DC power-supply application requiring low-cost, system-level voltage control, calibration, or margin testing. Typical end products include servers, routers, switches, and video processing cards.

The DS4426 powers up with all DAC outputs in a neutral (or zero current) output condition to minimise system-start-up overhead requirements and allow the power-supply feedback resistors to perform in a standard manner. Secondary circuitry on three of the outputs allows the user to program supply tracking or sequencing for added control during power-up/down conditions. Each output is capable of sinking or sourcing currents from ±50µA to ±200µA with ±10 per cent accuracy. The DS4426 uses an external resistor to program this full-scale value for each channel to maximise versatility. The I²C bus is then used to set the current to any of the 127 sink or 127 source steps linearly up to the maximum full-scale value. Two address inputs allow up to four devices or sixteen separate supplies to be controlled on a single I²C bus.

The DS4426 is fully specified over the -40°C to +85°C extended industrial temperature range, and is available in a 4mm x 4mm, 28-pin TQFN package. Pricing starts at Rs.57.64 ($1.18) for 10,000-up, FOB USA.

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