How to get the temperature compensation output in the ADUM4190? and is it non linear?
The ADuM4190 EAout will vary with temperature, but how much depends on the application circuit used. Are you asking about the target application as an isolated error amplifier? Then the datasheet curve of figure 8 EAout accuracy Vs temperature shows the characteristic, which has small changes, due to the internal trimming that we do in production, and is non-linear.
If not used as an isolated error amplifier, since there is not a closed loop isolated power supply circuit, the output voltage will vary more. Look at the Eaout offset Vs temperature curve in figure 13, and EAout gain vs temperature shown in 12. These curves are also non-linear.
Thank you bkennedy,
i have some more doubts regarding the ADUM4190.
In the figure 25 graph we can note that there is a clamping of the waveform in the output and its different from the input signal, so actually is there any clamping? And is it possible to isolate a two side analog waveform with a very small frequency of 1uHz to isolate?
The EAOUT2 pin has got 1mA current spec and i want to know the relevance of the value of the pull up resistor to the output side,if the current rating is wrt to EAOUT2 pin. Or else can you guide me to set the value of the resistor?
If i have a differential signal to the input then is there any problem if i arrange the op amp for the differential input signal?
Expecting the answers
Arunka: Answers to your questions:
1. There is not a clamping of the output. Ch1 = Blue = input 0.2V to 0.6V.
Ch2 = green = 0.24V to 0.62V, there is some error from an EAout offset spec of +/-0.4V, EAout gain = 0.83V/V to 1.17V/V.Ch3 = purple = 0.66V to 1.66V, gain = 2.5V/V to 2.7V/V.
2. Set the pullup resistor for value to obtain <= 1mA current. Example, if VDD1 = 10V, for High voltage EAout2 min = 5.0V, pullup resistor voltage = 10-5 = 5V. Resistor value = 5V/1mA = 5K or more.
3. In theory you can use the ADuM4190 as a differential input, but the output gain and offset specs shown in 1 above are very limiting in performance.
4. Can you describe your application and a circuit diagram?
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