Hii my name is aied ,a hardware engineer
i am designing a circuit for voltage measuring purpose , my input comes from CT (current transformer ) with values of 0 to 100mA .and i use an opamp to transform the current to voltage
so the input to my device is current not voltage !!
i need to isolate my device from the environment and i came across your isolation IC products
and my question is, if i have an current input as i described above ( that is not a digital communication line ) what iso isolation chip i can use ?
a will also say that after converting the current to voltage i will get 3.3v DC max using the op-amp
but i need to put the op amp after the isolation chip
in other words do you have a chip that can deliver current from input pin to output pin that is also isolated ?
i can use the op-amp circuit to convert the current to voltage and then connect it to the isolation chip but then i will run the risk of my op-amp circuit is not protected .
i will be very thankful for your help
Alex SmithApplications Engineer | Precision Delta-Sigma Converters
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In reply to Alexander Smith:
thanks for your answer
i looked up the datasheet for the AMC chip family
and i have a question
it seem that the AMC family is suitable for my application because they have the isolation that i need , but i didn't understand how to use them
i have an input current with a sine wave shape with an amplitude that can range from 0 to 100mA and frequency of 50 hz .
if i feed this current to a 30 ohm resistor i will get a sine wave voltage with an amplitude of 3v=100mA X 30ohm with a frequency of 50hz.
i want to transmit this sine wave with an amplitude of 3 volts and frequency of 50hz from input of the AMC isolation amplifier to the output ,cause i need to convert this sine wave voltage trough an ADC converter on the other side of the AMC isolation amplifier
from what i saw in order to keep linearity that the AMC1300 can accept 50mv between the input pins , but i want to transmit a 3 volt sine signal through the AMS isolation amplifier
how can i do that ?-
again i be happy for your help if you can shed some light on how to do this application .
In reply to AIED BEBAR:
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