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Interface and Isolation
Interface and Isolation
Documents ADuM3190 FAQ: Why does the ADuM3190 have 2 Error Amp Outputs?
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  • INTERFACE AND ISOLATION SUPPORT COMMUNITY
  • Tags List (Interface & Isolation)
  • +General: FAQ
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    • ADuM3190 FAQ: Why does the ADuM3190 have 2 Error Amp Outputs?
    • ADuM3190/4190 isolated error amplifier be used as an isolation amplifier?
    • Can I use the ADuM3190/ADuM4190 as an isolated op amp to convert a 4-20mA signal and      how would it work?
    • difference between the ADuM3190 and the ADuM4190
    • How much output current can I get from the COMP pin of an ADuM3190/4190?
    • If I don't use the ADuM3190/4190 as an isolated error amplifier, what is the gain of the output?
    • Mesaure AC Line Current (230V AC)
    • What does the 1% accuracy of the ADuM3190/4190 include?
    • What is the current transfer ratio of the ADuM3190/4190 and how much can this change over temperature and from part to part?
    • What is the Gain Bandwidth product of the ADuM3190/4190?
    • Why do the ADuM3190 and ADuM4190 have two error amplifier outputs
    • Why is the ADuM3190/4190 supply voltage range different than the operating voltage range?
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ADuM3190 FAQ: Why does the ADuM3190 have 2 Error Amp Outputs?

Q: Why does the ADuM3190 have two Error Amp Output pins?

A: The ADuM3190 has an EAOUT pin 6 which has an output voltage specified to 2.4V and an EAOUT2 pin 7 which is specified to 5.0V when EAOUT2 is used with a pull-up resistor to a 10V to 20V supply. The EAOUT2 pin provides a higher voltage to help drive the COMP pin of a PWM controller which may require 5V. The internal circuits of the ADuM3190 run off internal 3.0V regulators, which provide stable operation and are powered from an external VDD supply voltage that can range from 3V to 20V. This is why the EAOUT pin 6 is limited to less than 3V. The EAOUT2 pin has an open drain circuit which is used with an external pullup to connect to a VDD supply voltage of 3V to 20V, which is how EAOUT2 can be rated to 5.0V. An internal diode at the EAOUT2 pin clamps at about 5.5V to protect it from the higher VDD voltages when used with a pullup resistor. See the attached circuit for details about the EAOUT and EAOUT2 pins. 

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  • adum3190
  • digital_isolator
  • icoupler
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