IL815TE datasheet(12/23 Pages) NVE

12 / 23 page

IL800-Series Isolators

NVE Corporation

11409 Valley View Road, Eden Prairie, MN 55344

(952) 829-9217

www.nve.com

www.YouTube.com/NveCorporation

iso-apps@nve.com

Application Information

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.

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.

Additionally, on the IL810, the internal clock can be disabled for

even better EMC performance.

These isolators are fully compliant with IEC 61000-6-1 and

IEC 61000-6-2 standards for immunity, and IEC 61000-6-3,

IEC 61000-6-4, CISPR, and FCC Class A standards for emissions.

Immunity to external magnetic fields is even higher if the field

direction is “end-to-end” rather than to “pin-to-pin” as shown in the

diagram below:

Cross-axis Field Direction

Power Supply Decoupling

Both power supplies should be decoupled with 0.1 µF typical

(0.047 µF minimum) capacitors as close as possible to the VDD

pins.

Maintaining Creepage

Creepage distances are often critical in isolated circuits. In addition to

meeting JEDEC standards, NVE isolator packages have unique creepage

specifications. Standard pad libraries often extend under the package,

compromising creepage and clearance. Similarly, ground planes, if used,

should be spaced to avoid compromising clearance. Package drawings

and recommended pad layouts are included in this datasheet.

Dynamic Power Consumption

IsoLoop Isolators achieve their low power consumption from the

way they transmit data across the isolation barrier. A magnetic field

is created around the GMR Wheatstone bridge by detecting the

edge transitions of the input logic signal and converting them to

narrow current pulses. 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

2.5 ns, the power consumption is independent of mark-to-space

ratio and solely dependent on frequency. This has obvious

advantages over optocouplers, which have power consumption

heavily dependent on mark-to-space ratio.

DC Correctness, EMC, and the SYNC Function

NVE digital isolators have the lowest EMC noise signature of any

high-speed digital isolator on the market today because of the dc

nature of the GMR sensors used. It is perhaps fair to include opto-

couplers in that dc category too, but their limited parametric

performance, physically large size, and wear-out problems

effectively limit side by side comparisons between NVE’s isolators

and isolators coupled with RF, matched capacitors, or transformers.

IL800-Series isolators have an internal refresh clock which ensure

the synchronization of input and output within 9 μs of the supply

passing the 1.5 V threshold. The IL810 allows external control of

the refresh clock through the SYNC pin thereby further lowering

the EMC footprint. This can be advantageous in applications such

as hi-fi, motor control and power conversion.

The isolators can be used with Power on Reset (POR) circuits

common in microcontroller applications, as the means of ensuring

the output of the device is in the same state as the input a short time

after power up. Figure 1 shows a practical Power on Reset circuit:

Fig. 1. Typical Power-On Reset Circuit for IL810

After POR, the SYNC line goes high, the internal clock is disabled,

and the EMC signature is optimized. Decoupling capacitors are

omitted for clarity.

POR

SET

OUT

SYNC

IL510

dd1

dd2

IL810

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