ADM2682EBRIZ Analog Devices Inc, ADM2682EBRIZ Datasheet - Page 19

• Manufacturer Part Number: ADM2682EBRIZ
• Description: 58T8844
• Manufacturer: Analog Devices Inc

Specifications of ADM2682EBRIZ

• No. Of Channels: 1
• Propagation Delay: 100ns
• Supply Current: 175mA
• Supply Voltage Range: 3V To 5.5V
• Digital Ic Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes

INSULATION LIFETIME
All insulation structures eventually break down when subjected to
voltage stress over a sufficiently long period. The rate of insulation
degradation is dependent on the characteristics of the voltage
waveform applied across the insulation. Analog Devices conducts
an extensive set of evaluations to determine the lifetime of the
insulation structure within the ADM2682E/ADM2687E.
Accelerated life testing is performed using voltage levels higher
than the rated continuous working voltage. Acceleration factors for
several operating conditions are determined, allowing calculation
of the time to failure at the working voltage of interest. The values
shown in Table 9 summarize the peak voltages for 50 years of
service life in several operating conditions. In many cases, the
working voltage approved by agency testing is higher than the
50-year service life voltage. Operation at working voltages higher
than the service life voltage listed leads to premature insulation
failure.
The insulation lifetime of the
on the voltage waveform type imposed across the isolation barrier.
The iCoupler insulation structure degrades at different rates,
depending on whether the waveform is bipolar ac, unipolar ac,
or dc. Figure 42, Figure 43, and Figure 44 illustrate these different
isolation voltage waveforms.
Bipolar ac voltage is the most stringent environment. A 50-year
operating lifetime under the bipolar ac condition determines
the Analog Devices recommended maximum working voltage.
In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50-year service life. The working
voltages listed in Table 9 can be applied while maintaining the
50-year minimum lifetime, provided the voltage conforms to either
th
e unipolar ac or dc voltage cases. Any cross-insulation voltage
ADM2682E/ADM2687E
depends
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waveform that does not conform to
be treated as a bipolar ac waveform, and its peak voltage should
be limited to the 50-year lifetime voltage value listed in Table 9.
ISOLATED SU
The typical output voltage of the integrated isoPo
isolated supply is 3.3 V. The isolated supply in the ADM2682E/
ADM2687E
when the junction temperature of the device is kept below 130°C.
This includes the current required by the internal RS-485 circuitry,
and typically, no additional current is available on V
external applications.
NOTES
1. THE VOLTAGE IS SHOWN AS SINUSODIAL FOR ILLUSTRATION
PURPOSES ONLY. IT IS MEANT TO REPRESENT ANY VOLTAGE
WAVEFORM VARYING BETWEEN 0 AND SOME LIMITING VALUE.
THE LIMITING VALUE CAN BE POSITIVE OR NEGATIVE, BUT THE
VOLTAGE CANNOT CROSS 0V.
is typically capable of supplying a current of 55 mA
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
0V
0V
0V
PPLY CONSIDERATIONS
Figure 44. Unipolar AC Waveform
Figure 42. Bipolar AC Waveform
Figure 43. DC Waveform
ADM2682E/ADM2687E
Figure 43 or Figure 44 should
wer dc-to-dc
ISOOUT
for