TINA/Spice/AMC1301: CMRR different in simulation

Hi,

FYI, One of our team will get back to you as far as the correctness of the value of the datasheet.

Herman

Hi,
thanks for you help. I am looking Forward to learn if the data sheet value is correct.

Jan-Roman

Hi,

How are you testing it?

Can you please check the attached file from your end.

E2E_cmrr_amc.TSC

Hi,

im simulating with LTSpice. In the Picture you can see my results and schematic.

Im just making an AC-Sweep at the Inputs of the AMC1301.

Thanks for your help.

Jan-Roman

Hi again,
I apply a sine signal of frequency 10kHz and 100 V peak to peak amplitude to both inputs. So that the difference of the inputs is 0V. The 100V corresponds to 40dBV. At the output I measure a Peak to Peak amplitude of 40,885µV with 10kHz. 40.885µV correspond to -87.77dBV. So there is a difference from input to output of -127,77dBV. This is the CMRR or do I have a thinking error?
Jan-Roman

Hi,
i will try it. can you explain me the Input area of your circuit? Why is there a Connection from VINP to VOUTN with 1 kOhm resistor? And a Connection from VINN to VOUTP with a 1kOhm resistor? And why is there a Transformator at the Input of the circuit?
Jan-Roman Maaser

Hi,
thanks for your help. I read the TI document.
The external resistors in the document are only used to adjust the gain factor. Since the AMC1301 has a fixed gain factor, it won't use external resistors, as well as R1,R3,R4 and R5 in your schematic, will it?

Best regards,
Jan-Roman Maaser