AD7403 datasheet(23/25 Pages) AD

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AD7403

Data Sheet

These tests subjected the AD7403 to continuous cross isolation

voltages. To accelerate the occurrence of failures, the selected

test voltages were values exceeding those of normal use. The

time to failure values of these units were recorded and used to

calculate the acceleration factors. These factors were then used

to calculate the time to failure under the normal operating

conditions. The values shown in Table 9 are the lesser of the

following two values:

•

The value that ensures at least a 20-year lifetime of

continuous use.

•

The maximum VDE approved working voltage.

Note that the lifetime of the AD7403 varies according to the

waveform type imposed across the isolation barrier. The

iCoupler insulation structure is stressed differently, depending

on whether the waveform is bipolar ac, unipolar ac, or dc.

Figure 43, Figure 44, and Figure 45 illustrate the different

isolation voltage waveforms.

RATED PEAK VOLTAGE

Figure 43. Bipolar AC Waveform, 50 Hz or 60 Hz

RATED PEAK VOLTAGE

Figure 44. Unipolar AC Waveform, 50 Hz or 60 Hz

RATED PEAK VOLTAGE

Figure 45. DC Waveform

Rev. B | Page 22 of 24

AD7403 Datasheet(PDF) 23 Page - Analog Devices