Application Information

NVE Corporation

(952) 829-9217

iso-apps@nve.com

www.IsoLoop.com

www.nve.com

Why Isolate?

Isolation reduces noise, eliminates ground loops, and improves safety.

Applications

Popular IL700/IL200 applications include multiplexed data transmission, board-to-board

communication, serial communications, and logic-level shifting.

Board Layout Speed Limitations

Circuit board traces should be as short as possible with a minimum of vias for best

performance. Since the evaluation board was designed for ease of use and with test points, it

may not provide maximum speed.

Electrostatic Discharge Sensitivity

This product has been tested for electrostatic sensitivity to the limits in the datasheet.

However, all integrated circuits and boards should be handled with appropriate care to avoid

damage. Damage caused by inappropriate handling or storage could range from performance

degradation to complete failure.

Electromagnetic Compatibility

IsoLoop Isolators have the lowest EMC footprint of any isolation technology. IsoLoop

Isolators’ Wheatstone bridge configuration and differential magnetic field signaling ensure

excellent EMC performance against all relevant standards. These isolators are fully compliant

with generic EMC standards EN50081, EN50082-1 and the umbrella line-voltage standard for

Information Technology Equipment (ITE) EN61000.

Power Supply Decoupling and Ground Planes

As shown on this board, both isolator power supplies should be decoupled with low-ESR

47 nF ceramic capacitors. Bypass capacitors should be as close as possible to the VDD pins.

Ground planes for both GND1 and GND2 are recommended for data rates above 10 Mbps.

Signal Status on Start-up and Shut Down

To minimize power dissipation, IL700 input signals 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 including an initialization signal in the start-up circuit. Initialization

consists of toggling the input either high then low, or low then high.