adum1200 Analog Devices, Inc., adum1200 Datasheet - Page 16

• Manufacturer Part Number: adum1200
• Description: Dual-channel Digital Isolators
• Manufacturer: Analog Devices, Inc.

ADuM1200/ADuM1201
Note that at combinations of strong magnetic fields and high
frequencies, any loops formed by printed circuit board traces
could induce sufficiently large error voltages to trigger the
threshold of succeeding circuitry. Care should be taken in the
layout of such traces to avoid this possibility.
1000
0.01
100
0.1
10
1
1k
DISTANCE = 100mm
Figure 14. Maximum Allowable Current for Various
DISTANCE = 5mm
10k
Current-to-ADuM120x Spacings
MAGNETIC FIELD FREQUENCY (Hz)
100k
1M
DISTANCE = 1m
10M
100M
Rev. B | Page 16 of 20
POWER CONSUMPTION
The supply current at a given channel of the ADuM120x
isolator is a function of the supply voltage, the channel’s data
rate, and the channel’s output load.
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 I
and I
ADuM1200 and ADuM1201 channel configurations.
r
DDI (D)
DDI (Q)
DD1
L
DDO
is the input stage refresh rate (Mbps).
is the output load capacitance (pF).
I
I
I
I
and I
DDI
DDI
DDO
DDO
DD2
is the output supply voltage (V).
, I
, I
DDO (D)
DDO (Q)
= I
= I
= I
= (I
supply current as a function of data rate for
DD2
DDI (Q)
DDI (D)
DDO (Q)
DDO (D)
are calculated and totaled. Figure 6 and Figure 7
are the input and output dynamic supply currents
are the specified input and output quiescent
× (2f – f
+ (0.5 × 10
DD1
r
) + I
and I
DDI (Q)
−3
) × C
DD2
supply current, the supply
L
V
DDO
) × (2f – f
r
) + I
f ≤ 0.5f
f > 0.5f
f ≤ 0.5f
f > 0.5f
DDO (Q)
DD1
r
r
r
r