ADM2483 datasheet(16/20 Pages) AD

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ADM2483

Rev. 0 | Page 16 of 20

100

0.1

0.01

0.001

10k

100k

10M

100M

MAGNETIC FIELD FREQUENCY (Hz)

Figure 27. Maximum Allowable External Magnetic Flux Density

For example, at a magnetic field frequency of 1 MHz, the

maximum allowable magnetic field of 0.2 kGauss induces a

voltage of 0.25 V at the receiving coil. This is about 50% of the

sensing threshold and does not cause a faulty output transition.

Similarly, if such an event occurred during a transmitted pulse

and was of the worst-case polarity, it would reduce the received

pulse from >1.0 V to 0.75 V. This would be well above the 0.5 V

sensing threshold of the decoder.

As a convenience to the user, these magnetic flux density values

are shown in Figure 28, using more familiar quantities such as

maximum allowable current flow, at given distances away from

the ADM2483 transformers.

1000

100

0.1

0.01

10k

100k

10M

100M

MAGNETIC FIELD FREQUENCY (Hz)

DISTANCE = 1m

DISTANCE = 5mm

DISTANCE = 100mm

Figure 28. Maximum Allowable Current for Various

Current-to-ADM2483 Spacings

Note that at combinations of strong magnetic field and high

frequency, any loops formed by printed circuit board traces

could induce large enough error voltages to trigger the

thresholds of succeeding circuitry. To avoid this possibility, be

careful in the layout of such traces.

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