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AMC1210MB-EVM: Calculation of ENOB bits of Sincfilter and Integrator

Bhargav Pendurthi
Prodigy 160 points
Part Number: AMC1210MB-EVM
Other Parts Discussed in Thread: AMC1210

Hello,

I am using AMC1210 EVM device in my system. I want to calcualte ENOB of total device and also total sample time. can you please guide me on this.

Can you please help me how to calculate ENOB of Sincfilter output and ENOB of Integrator output.? I think total ENOB is ENOB of sinc3filter+ENOB if Integrator. is it correct?

I have understood that Fsinc3 filter frequency=fmodulator frequency/SOSR and Fintegrator=fsinc3/IOSR value. is it correct?

like this is there any formulae for ENOB also?

Thank You

Regards,

Bhargav Pendurthi

  • 0
    TI__Mastermind 47595 points

    Hi Bhargav,

    Please see the "Resolver Applications" section of the AMC1210 datasheet. 

    ENOB = ENOB_Sincfilter + ENOB_Integrator

    Where IOSR = 4^ENOB_Integrator & ENOB_Sincfilter can be seen in figure 15. 

    As stated in this section, keep in mind that the demodulation function allows the integrator to sum a full rectified cycle of the carrier signal. When choosing IOSR = 16, the integrator will sum 16 samples of the digital filter. The demodulation causes a loss of ENOB of approximately 0.5LSB.