ADuM7440/ADuM7441/ADuM7442,pdf

The ADuM744x are four channel digital isolators based on Analog Devices, Inc. iCoupler® technology. Combining high speed CMOS and monolithic air core transformer technologies, these isolation components provide outstanding performance characteristics superior to alternatives such as optocoupler devices and other integrated couplers.

The ADuM7444x family of quad 1kV digital isolation devices is packaged in a small 16 lead QSOP. While most four channel isolators come in 16 SOIC W packages, the ADuM744x frees almost 70% of board space and yet can still withstand high isolation voltage and meet regulatory requirements such as UL and CSA standards (pending). In addition to the space savings, the ADuM744x offers lower price than 2.5kV or 5kV isolators where only functional isolation is needed.

This family, like many ADI isolators, offers very low power consumption, consuming one-tenth to one-sixth the power of comparable isolators at comparable data rates up to 10Mbps. Despite the low power consumption, all models of the ADuM744x provide low pulse width distortion (< 3ns for Cgrade). Moreover, every model has an input glitch filter to protect against extraneous noise disturbances.

The ADuM744x isolators provide four independent isolation channels in a variety of channel configurations and 3 data rates (see the Ordering Guide) up to 25 Mbps. All models operate with the supply voltage on either side ranging from 3.0 V to 5.5 V, providing compatibility with lower voltage systems as well as enabling voltage translation functionality across the isolation barrier. All products also have an output default high logic state in the absence of the input power.

Applications