Question Can the ADuM3190/4190 isolated error amplifier be used as an isolation
amplifier? Answer The ADuM3190 and ADuM4190 are ideal for linear feedback in isolated power
supply applications. Since…
Question Can I use the ADuM3190/ADuM4190 as an isolated op amp to convert a 4-20mA
signal and how would it work? Answer You could use a 75 ohm input resistor to convert the 4 – 20mA signal to a 0.3V…
Question What is the difference between the ADuM3190 and the ADuM4190? Answer The ADuM3190 and ADuM4190 have the exact same function and performance, but the
ADuM3190 is in the QSOP-16 package for applications…
Question How much output current can I get from the COMP pin of an ADuM3190/4190? Answer The COMP pin is designed for +/-3mA maximum output current, which should allow
for a range of resistor values…
Question If I don’t use the ADuM3190/4190 as an isolated error amplifier, what is the
gain of the output? Answer The ADuM3190 has two amplifier outputs. Let’s assume the operational amplifier
has been…
Question Is it possible to use the ADuM3190 to measure current in 230V AC line? Answer The ADuM3190 was designed for a 0.35V to 1.5V input, while the 230VAC current
from a resistor would have a positive…
Question What does the 1% accuracy of the ADuM3190/4190 include? Answer The 1% accuracy specification includes the use of the ADuM3190/4190 in an
isolated feedback loop and includes drift over temperature…
Question What is the current transfer ratio of the ADuM3190/4190 and how much can this
change over temperature and from part to part? Answer An optocoupler has a current transfer ratio (CTR) that can…
Question What is the Gain Bandwidth product of the ADuM3190/4190? Answer The Gain Bandwidth product of the ADuM3190/4190 is 10MHz typical per Table 1 of
the datasheet.
Question Why do the ADuM3190 and ADuM4190 have two error amplifier outputs? Answer The ADuM3190/ADuM4190 have an EAOUT pin 6 which has an output voltage specified
to 2.4V and an EAOUT2 pin 7 which is…