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TMS320F28377S: SDFM scaling

Part Number: TMS320F28377S
Other Parts Discussed in Thread: AMC1304M25

Hello everyone,

on our hardware design we get a linear offset on our voltage measurements using the AMC1304M25 SDFM.

I just want to make sure that the scaling for the SDFM is done correctly.

We are using a 16-Bit represantation and I am interested in positive voltage values. So this is my scaling for the voltage at the AINP - AINN Pins of the AMC1304M25:

-max value of the 16-Bit Data of the SDFM in 2's complement: 2^15-1 = 32767

-full scale range of the sdfm (just the positive values): 0,25V = 0,8*0,3125V

so my sclaing factor for the bits to Volt is: SDFM-16-Bit Register value * 0,25V/ (0,8*32767) = SDFM-16-Bit Register value * 0,3125V/ 32767

Can you confirm that?

Many thanks!