ADUM1201BR Analog Devices Inc, ADUM1201BR Datasheet - Page 24

IC DIGITAL ISOLATOR 2CH 8-SOIC

ADUM1201BR

Manufacturer Part Number
ADUM1201BR
Description
IC DIGITAL ISOLATOR 2CH 8-SOIC
Manufacturer
Analog Devices Inc
Series
iCoupler®r
Datasheet

Specifications of ADUM1201BR

Inputs - Side 1/side 2
1/1
Number Of Channels
2
Isolation Rating
2500Vrms
Voltage - Supply
2.7 V ~ 5.5 V
Data Rate
10Mbps
Propagation Delay
50ns
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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ADuM1200/ADuM1201
APPLICATIONS INFORMATION
PCB LAYOUT
The ADuM120x digital isolators require no external interface
circuitry for the logic interfaces. Power supply bypassing is
strongly recommended at the input and output supply pins.
The capacitor value should be between 0.01 μF and 0.1 μF.
The total lead length between both ends of the capacitor and
the input power supply pin should not exceed 20 mm.
PROPAGATION DELAY-RELATED PARAMETERS
Propagation delay is a parameter that describes the time it takes
a logic signal to propagate through a component. The propagation
delay to a Logic low output can differ from the propagation delay
to a Logic high output.
Pulse width distortion is the maximum difference between
these two propagation delay values and is an indication of
how accurately the timing of the input signal is preserved.
Channel-to-channel matching refers to the maximum amount
that the propagation delay differs between channels within a
single ADuM120x component.
Propagation delay skew refers to the maximum amount that
the propagation delay differs between multiple ADuM120x
components operating under the same conditions.
DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY
Positive and negative logic transitions at the isolator input send
narrow (~1 ns) pulses to the decoder via the transformer. The
decoder is bistable and is therefore either set or reset by the
pulses, indicating input logic transitions. In the absence of logic
transitions of more than ~1 μs at the input, a periodic set of
refresh pulses indicative of the correct input state is sent to
ensure dc correctness at the output. If the decoder receives
no internal pulses for more than about 5 μs, the input side is
assumed to be unpowered or nonfunctional, in which case
the isolator output is forced to a default state (see Table 17
and Table 18) by the watchdog timer circuit.
The ADuM120x are extremely immune to external magnetic
fields. The limitation on the magnetic field immunity of the
ADuM120x is set by the condition in which induced voltage
in the receiving coil of the transformer is sufficiently large
enough to either falsely set or reset the decoder. The following
analysis defines the conditions under which this can occur. The
3 V operating condition of the ADuM120x is examined because
it represents the most susceptible mode of operation.
INPUT (V
OUTPUT (V
Ix
)
Ox
)
Figure 12. Propagation Delay Parameters
t
PLH
t
PHL
50%
50%
Rev. H | Page 24 of 28
The pulses at the transformer output have an amplitude greater
than 1.0 V. The decoder has a sensing threshold at about 0.5 V,
therefore establishing a 0.5 V margin in which induced voltages
can be tolerated. The voltage induced across the receiving coil is
given by
where:
β is the magnetic flux density (gauss).
N is the number of turns in the receiving coil.
r
Given the geometry of the receiving coil in the ADuM120x and
an imposed requirement that the induced voltage be 50% at
most of the 0.5 V margin at the decoder, a maximum allowable
magnetic field is calculated, as shown in Figure 13.
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 occurs during a transmitted pulse
(and has the worst-case polarity), it reduces the received pulse
from >1.0 V to 0.75 V—still well above the 0.5 V sensing
threshold of the decoder.
The preceding magnetic flux density values correspond to
specific current magnitudes at given distances away from the
ADuM120x transformers. Figure 14 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As seen, the ADuM120x are extremely immune and
can be affected only by extremely large currents operating very
close to the component at a high frequency. For the 1 MHz
example, a 0.5 kA current would have to be placed 5 mm away
from the ADuM120x to affect the operation of the component.
n
is the radius of the nth turn in the receiving coil (cm).
V = (−dβ/dt)Σ∏r
0.001
0.01
Figure 13. Maximum Allowable External Magnetic Flux Density
100
0.1
10
1
1k
10k
MAGNETIC FIELD FREQUENCY (Hz)
n
2
; n = 1, 2, … , N
100k
1M
10M
100M

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