The ADuM3400/ADuM3401/ADuM3402 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 2.7 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 powerup/power-down
conditions.
In comparison to the ADuM1400/ADuM1401/ADuM1402
isolators, the ADuM3400/ADuM3401/ADuM3402 isolators
contain various circuit and layout changes to provide increased
capability relative to system-level IEC 61000-4-x testing (ESD/
burst/surge). The precise capability in these tests for either set of
isolators is strongly determined by the design and layout of the
user’s board or module. For more information, see the AN-793 application note, ESD/Latch-Up Considerations with iCoupler Isolation Products.
Applications
- General-purpose multichannel isolation
- SPI/data converter isolation
- RS-232/RS-422/RS-485 transceivers
- Industrial field bus isolation
