The ADuM3400/ADuM3401/ADuM34021 are 4-channel digital
isolators based on the Analog Devices, Inc., iCoupler® technology. Combining high speed CMOS and monolithic air core
transformer technology, these isolation components provide
outstanding performance characteristics superior to alternatives
such as optocoupler devices.
iCoupler devices remove the design difficulties commonly
associated with optocouplers. Typical optocoupler concerns
regarding uncertain current transfer ratios, nonlinear transfer
functions, and temperature and lifetime effects are eliminated
with the simple iCoupler digital interfaces and stable performance
characteristics. The need for external drivers and other discrete
components is eliminated with these iCoupler products. Furthermore, iCoupler devices consume one-tenth to one-sixth the
power of optocouplers at comparable signal data rates.
The isolators provide four independent isolation channels in a
variety of channel configurations and data rates (see the Ordering
Guide). 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 a voltage translation
functionality across the isolation barrier. The isolators have a
patented refresh feature that ensures dc correctness in the absence
of input logic transitions and during power-up/power-down
conditions.
