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ADC12DL3200: inverted inputs INA+- and INB+-

Part Number: ADC12DL3200

Hi team,

in the evaluation board of the ADC12DL3200, the analog inputs INA +- and INB +- are inverted.

The figure shows the schematic: the output 1 of the balun 1 (pin 3) is connected to the INA+ (pin A4) and the output 1 of the balun 2  (pin 3) is connected to the INB- (pin T5).

In this way the two input signals are 180° out of phase. Is it correct?

In the attached document there is an alternative input configuration with a different balun transformer?

Is this configuration correct?

Thank you in advance.

Best Regards.

Matteo Ricci

ADC12DL3200_ANALOG_INPUT.pdf

  • Hi Matteo,

    Yes, the two inputs will be 180 degrees out of phase from each other. This is a result of the PN being mirrored on the package as opposed to the P pin being to the left (or right) of the N pin on each of the ADC inputs. This is something that we will be fixing on some devices moving forward to accommodate easy front end layout. What you’ve drawn is correct in theory a traditional standard transformer, but you will have to check with mini circuits to see if what you are proposing is an adequate solution with this TCM2-33WX+ or if doing such proposed design will significantly degrade the performance.

    Regards, Chase