Isolated Serial
Interfaces
Isolating serial interfaces reduces noise and eliminate ground loops.
But unlike optocouplers, IsoLoop isolators have unlimited life with
no degradation. Reduce board space with up to two channels per MSOP
and up to five channels in 0.15" narrow-body SOICs. Illustrative
applications are as follows:
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Applications
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Differential Signal Isolation Using an IL611
IL600-Series Isolators are ideal for isolating differential signals
because you have access to the input coils and do not need
input power to drive the signal across the barrier.
When the voltage at node Y is greater than the voltage at node Z there is a logic high at the OUT+ node and a low
on the OUT- node.
Outputs are reversed when the voltage at node Z is higher than the voltage
at node Y. Current-limiting resistors can be selected to ensure input coil
currents are at least ±5 mA and no more than ±10 mA.
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Isolated
RS-232 Using IL712s
IL712s provide 2.5 kVrms isolation (1 minute) and 30 kV/µs typical
common-mode transient immunity. The IL712-1 is a unique MSOP dual-channel
isolator to minimize board space.
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Isolated I²C Using IL612A
This circuit provides bidirectional isolation of I²C bus signals with no
restrictions on data rate and none of the I²C bus latch-up problems common
with other isolation circuits.
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Isolated USB Using IL710s
In this illustrative circuit, power is supplied by USB bus power on one side
of the isolation barrier, and the USB node’s external supply on the other
side of the barrier. IL700-Series Isolators are specified at just 3 ns
worst-case pulse width distortion. The IL700s provide 2.5 kVrms isolation
(1 minute) and 30 kV/µs typical common-mode transient immunity.
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Isolated I²S Using IL710/IL711
Isolating a CD transport DAC with an isolated Inter-IC Sound (I²S)
bus eliminates ground loops. The IL700-Series isolators' precision edge placement
(only 50 ps typical jitter) all but eliminates noise-induced phase error
and hum in the analog side of the audio system.
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