ADUM1234BRWZ 查看數據表（PDF） - Analog Devices
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ADUM1234BRWZ Datasheet PDF : 12 Pages
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ADuM1234
APPLICATION NOTES
COMMON-MODE TRANSIENT IMMUNITY
In general, common-mode transients consist of linear and
sinusoidal components. The linear component of a common-
mode transient is given by
VCM, linear = (ΔV/Δt)t
where ΔV/Δt is the slope of the transient shown in Figure 11
and Figure 12.
The transient of the linear component is given by
dVCM/dt = ΔV/Δt
Figure 8 characterizes the ability of the ADuM1234 to operate
correctly in the presence of linear transients. The data is based
on design simulation and is the maximum linear transient
magnitude that the ADuM1234 can tolerate without an
operational error. This data shows a higher level of robustness
than what is listed in Table 5 because the transient immunity
values obtained in Table 5 use measured data and apply
allowances for measurement error and margin.
400
350
300
BEST-CASE PROCESS VARIATION
250
200
150
WORST-CASE PROCESS VARIATION
100
50
0
–40
–20
0
20
40
60
TEMPERATURE (°C)
80
100
Figure 8. Transient Immunity (Linear Transients) vs. Temperature
The sinusoidal component (at a given frequency) is given by
VCM, sinusoidal = V0sin(2πft)
where:
V0 is the magnitude of the sinusoidal.
f is the frequency of the sinusoidal.
The transient magnitude of the sinusoidal component is given by
dVCM/dt = 2πf V0
Figure 9 and Figure 10 characterize the ability of the
ADuM1234 to operate correctly in the presence of sinusoidal
transients. The data is based on design simulation and is the
maximum sinusoidal transient magnitude (2πf V0) that the
ADuM1234 can tolerate without an operational error. Values
for immunity against sinusoidal transients are not included in
Table 5 because measurements to obtain such values have not
been possible.
300
250
BEST-CASE PROCESS VARIATION
200
150
100
50
WORST-CASE PROCESS VARIATION
0
0
250 500 750 1000 1250 1500 1750 2000
FREQUENCY (MHz)
Figure 9. Transient Immunity (Sinusoidal Transients),
27°C Ambient Temperature
250
200
BEST-CASE PROCESS VARIATION
150
100
50
WORST-CASE PROCESS VARIATION
0
0
250 500 750 1000 1250 1500 1750 2000
FREQUENCY (MHz)
Figure 10. Transient Immunity (Sinusoidal Transients),
100°C Ambient Temperature
15V
VDD1
5V
GND1
15V
ΔV
VDDA AND VDDB
15V
GNDA AND GNDB
VDDA AND VDDB
Δt
GNDA AND GNDB
VDD1
5V
GND1
ΔV
Δt
15V
Figure 11. Common-Mode Transient Immunity Waveforms, Input to Output
15V
VDDA/VDDB
15V
GNDA/GNDB
15V
ΔV
VDDA/VDDB
Δt
GNDA/GNDB
VDDB/VDDA
15V
GNDA/GNDB
VDDB/VDDA
15V
GNDB/GNDA
ΔV
Δt
15V
Figure 12. Common-Mode Transient Immunity Waveforms,
Between Outputs
Rev. 0 | Page 8 of 12
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