IL710
ISOLOOP®
4
RHOPOINT COMPONENTS Hurst Green, Oxted, Surrey RH8 9AX UK
Telephone: +44 (0) 870 608 1188
Fax: +44 (0) 870 241 2255
Internet: www.rhopointcomponents.com
Notes:
1.
Absolute Maximum ambient operating temperature means
the device will not be damaged if operated under these
conditions. It does not guarantee performance.
2.
PWD is defined as | t
PHL -tPLH |.
%PWD is equal to the
PWD divided by the pulse width.
3.
t
PSK is equal to the magnitude of the worst case difference in
t
PHL and/or tPLH that will be seen between units at 25
OC.
4.
CM
H is the maximum common mode voltage slew rate that
can be sustained while maintaining VO > 0.8 VDD2.CML is
the maximum common mode input voltage that can be
sustained while maintaining VO < 0.8 V. The common mode
voltage slew rates apply to both rising and falling common
mode voltage edges.
5.
Device is considered a two terminal device:
pins 1-4 shorted and pins 5-8 shorted.
Application Notes:
Power Consumption
Isoloop devices achieve their low power consumption from
the manner by which they transmit data across the isolation
barrier. By detecting the edge transitions of the input logic
signal and converting these to narrow current pulses a
magnetic field is created around the GMR Wheatstone
bridge. Depending on the direction of the magnetic field,
the bridge causes the output comparator to switch following
the input logic signal. Since the current pulses are narrow,
about 2.5ns wide, the power consumption is independent of
mark-to-space ratio and solely dependent on frequency. This
has obvious advantages over optocouplers whose power
consumption is heavily dependent on its on-state and
frequency.
The approximate power supply current per channel for
Isoloop
® is: I(input)= 40 .
f
.
1 mA
fmax
4
where
f=
operating frequency
fmax=
50 MHz
Power Supplies
It is recommended that low ESR ceramic capacitors be
used to decouple the supplies. 10nF capacitors should
be placed as close to the device as possible between VDD1
and GND1, as well as between VDD2 and GND2.
Signal Status on Start-up and Shut Down
To minimize power dissipation, the input signal to the
IL710 is differentiated and then latched on the output side
of the isolation barrier to reconstruct the signal. This could
result in an ambiguous output state depending on power up,
shutdown and power loss sequencing. Therefore, the
designer should consider the inclusion of an initialization
signal in his start-up circuit.
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to
the limits stated in the specifications. However, NVE
recommends that all integrated circuits be handled with
appropriate care to avoid damage. Damage caused by
inappropriate handling or storage could range from
performance degradation to complete failure.
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