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AMC1100 Evaluation Module

svml
Prodigy 20 points
Other Parts Discussed in Thread: AMC1100

Hello,

the output of the AMC1100 is Vdd/2 +-2V. So if there are +5V applied to the secondary side the output will be 2,5V+-2V. The problem is i need the signal as input for an ADC within a range of +-250mV.

Is it simply possible to apply +2,5V to Vdd and -2,5V to GND to get an output of 0V +- 2V ?

thank you

  • 0
    TI__Genius 9975 points

    Hello Sven,

    Yes, you can indeed do something along the lines of your previous post. However, please note the following details:

    1)      The common mode output of the AMC1100 is not quite VDD/2. It is typically 1.29 V for a 3.3 V supply and 2.55 V for a 5 V supply.

    2)      The exact value of the common mode output of the AMC1100 is not guaranteed to be exactly 1.29 V or 2.55 V, this parameter is not precisely controlled (see page 5 of the AMC1100 datasheet) because the assumption is that the user will perform a differential measurement at the AMC1100 output.

    If you are planning to interface to the ADC differentially, then the details above should not be a problem; if, on the other hand, your plan is to use only one of the AMC1100 output pins in a single ended manner, then the output common mode will be observed by the ADC as an input offset that (potentially) needs to be calibrated.

    Hope this helps.

    Best regards,

    Jose