Quad-Channel, I²C-Margining IDACs with Three Channels of Power-Supply Tracking

The DS4426 contains four I²C-adjustable current DACs capable of sinking or sourcing current. External resistors set the full-scale range of each output. Each DAC output has 127 sink and 127 source steps that are programmed by the I²C interface. Power-supply tracking functionality is provided for three channels using dedicated control inputs. Once power-supply tracking is accomplished, the current outputs default to zero. Two address pins allow up to four DS4426 devices to exist on the same I²C bus.

Applications

* Adjustable Current Sink or Source * Power-Supply Adjustment * Power-Supply Margining * Power-Supply Tracking

* Four Current DACs

* 50µA to 200µA Adjustable Full-Scale Range

* 127 Settings Each for Sink and Source

* Power-Supply Tracking

* Power-Supply Sequencing

* Ramp-Up and Ramp-Down Tracking Control

* Ratiometric Tracking Support

* +2.7V to +5.5V Operation

* I²C-Compatible Serial Interface

* Two Address Input Pins Allow Up to Four Devices on Same I²C Bus

* Lead-Free, 28-Pin TQFN Package (4mm x 4mm) with Exposed Pad

* Industrial Temperature Range: -40°C to +85°C