adum3400 Analog Devices, Inc., adum3400 Datasheet - Page 22

• Manufacturer Part Number: adum3400
• Description: Quad-channel, Digital Isolators, Enhanced System-level Esd Reliability
• Manufacturer: Analog Devices, Inc.

ADuM3400/ADuM3401/ADuM3402
POWER CONSUMPTION
The supply current at a given channel of the ADuM340x
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); it is half of the input
data rate expressed in units of Mbps.
f
I
supply currents (mA).
To calculate the total I
currents for each input and output channel corresponding to
V
channel input supply current as a function of data rate. Figure 9
and Figure 10 provide per-channel supply output current as a
function of data rate for an unloaded output condition and for a
15 pF output condition, respectively. Figure 11 through Figure 15
provide total V
rate for ADuM3400/ADuM3401/ADuM3402 channel
configurations.
r
DDI (D)
DDI (Q)
L
DDO
DD1
is the input stage refresh rate (Mbps).
is the output load capacitance (pF).
I
I
I
I
and V
is the output supply voltage (V).
DDI
DDI
DDO
DDO
, I
, I
DDO (D)
DDO (Q)
= I
= I
= (I
= I
DD2
DDI (Q)
DDI (D)
DDO (Q)
DDO (D)
are the input and output dynamic supply currents
are the specified input and output quiescent
are calculated and totaled. Figure 8 provides per-
DD1
× (2f − f
and V
+ (0.5 × 10
DD1
DD2
r
) + I
and I
supply current as a function of data
−3
DDI (Q)
) × C
DD2
supply current, the supply
L
× V
DDO
) × (2f − f
r
f ≤ 0.5 f
f > 0.5 f
f ≤ 0.5 f
f > 0.5 f
) + I
DDO (Q)
Rev. 0 | Page 22 of 24
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r
r
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