ADUM1201AR Analog Devices Inc, ADUM1201AR Datasheet - Page 25

IC DIGITAL ISOLATOR 2CH 8-SOIC

ADUM1201AR

Manufacturer Part Number
ADUM1201AR
Description
IC DIGITAL ISOLATOR 2CH 8-SOIC
Manufacturer
Analog Devices Inc
Series
iCoupler®r
Datasheet

Specifications of ADUM1201AR

Inputs - Side 1/side 2
1/1
Number Of Channels
2
Isolation Rating
2500Vrms
Voltage - Supply
2.7 V ~ 5.5 V
Data Rate
1Mbps
Propagation Delay
150ns
Output Type
Logic
Package / Case
8-SOIC (3.9mm Width)
Operating Temperature
-40°C ~ 105°C
Operating Temperature (min)
-40C
Operating Temperature Classification
Industrial
Operating Temperature (max)
105C
Package Type
SOIC N
Rad Hardened
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Note that, at combinations of strong magnetic fields and high
frequencies, any loops formed by PCB traces can induce suffi-
ciently large error voltages to trigger the threshold of succeeding
circuitry. Care should be taken in the layout of such traces to
avoid this possibility.
POWER CONSUMPTION
The supply current at a given channel of the ADuM120x
isolator is a function of the supply voltage, the data rate of the
channel, and the output load of the channel.
For each input channel, the supply current is given by
For each output channel, the supply current is given by
where:
I
per channel (mA/Mbps).
C
V
f is the input logic signal frequency (MHz, half of the input data
rate, NRZ signaling).
f
I
supply currents (mA).
To calculate the total I
currents for each input and output channel corresponding to
I
provide per-channel supply currents as a function of data rate
for an unloaded output condition. Figure 8 provides per-
channel supply current as a function of data rate for a 15 pF
output condition. Figure 9 through Figure 11 provide total
r
DDI (D)
DDI (Q)
DD1
L
DDO
is the input stage refresh rate (Mbps).
is the output load capacitance (pF).
and I
1000
I
I
I
I
0.01
is the output supply voltage (V).
DDI
DDI
DDO
DDO
100
, I
, I
0.1
10
1
DDO (D)
DDO (Q)
1k
= I
= I
= I
= (I
DD2
DISTANCE = 100mm
Figure 14. Maximum Allowable Current for Various
DDI (Q)
DDI (D)
DDO (Q)
are calculated and totaled. Figure 6 and Figure 7
DDO (D)
are the input and output dynamic supply currents
are the specified input and output quiescent
× (2f – f
DISTANCE = 5mm
10k
Current-to-ADuM120x Spacings
+ (0.5 × 10
MAGNETIC FIELD FREQUENCY (Hz)
DD1
r
) + I
and I
100k
DDI (Q)
−3
DD2
) × C
supply currents, the supply
L
1M
V
DDO
DISTANCE = 1m
) × (2f – f
10M
r
) + I
100M
DDO (Q)
f ≤ 0.5f
f > 0.5f
f ≤ 0.5f
f > 0.5f
Rev. H | Page 25 of 28
r
r
r
r
V
ADuM1200 and ADuM1201 channel configurations.
INSULATION LIFETIME
All insulation structures eventually break down when subjected
to voltage stress over a sufficiently long period. The rate of insu-
lation degradation is dependent on the characteristics of the
voltage waveform applied across the insulation. In addition
to the testing performed by the regulatory agencies, Analog
Devices carries out an extensive set of evaluations to determine
the lifetime of the insulation structure within the ADuM120x.
Analog Devices performs accelerated life testing using voltage
levels higher than the rated continuous working voltage. Accel-
eration factors for several operating conditions are determined.
These factors allow calculation of the time to failure at the actual
working voltage. The values shown in Table 14 summarize the
peak voltage for 50 years of service life for a bipolar ac operating
condition and the maximum CSA/VDE approved working volt-
ages. In many cases, the approved working voltage is higher than
the 50-year service life voltage. Operation at these high working
voltages can lead to shortened insulation life in some cases.
The insulation lifetime of the ADuM120x depends 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 15, Figure 16, and Figure 17 illustrate these
different isolation voltage waveforms, respectively.
Bipolar ac voltage is the most stringent environment. The goal
of a 50-year operating lifetime under the ac bipolar condition
determines the Analog Devices recommended maximum
working voltage.
In the case of unipolar ac or dc voltage, the stress on the insu-
lation is significantly lower, which allows operation at higher
working voltages yet still achieves a 50-year service life. The
working voltages listed in Table 14 can be applied while main-
taining the 50-year minimum lifetime provided the voltage
conforms to either the unipolar ac or dc voltage cases. Any cross
insulation voltage waveform that does not conform to Figure 16
or Figure 17 is to be treated as a bipolar ac waveform, and its
peak voltage is to be limited to the 50-year lifetime voltage value
listed in Table 14.
DD1
and V
DD2
supply current as a function of data rate for
ADuM1200/ADuM1201

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