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
IL711/712
ISOLOOP®
4
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 V
O > 0.8 VDD.CML is
the maximum common mode input voltage that can be
sustained while maintaining V
O < 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
Because the IL711 and IL712 operate internally by using
narrow current pulses, it is recommended that low ESR
ceramic capacitors be used to decouple the supplies. 47nF
capacitors should be placed as close to the device as
possible between V
DD
1 and GND1 as well as between
V
DD
2 and GND2.
Signal Status on Start-up and Shut Down
To minimize power dissipation, the input signals to the
IL711 and IL712 are 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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