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ADC14L020: differential inputs range

user1081936
Prodigy 10 points

Part Number: ADC14L020

differential inputs question

 on manual descriptipon," the diffferential inputs provide a full sale differential input swing equal to 2times Vref"

  when Vref=1.0v, input swing=2Vp-p,

  but  at p20 seqution "signal inputs" differential input Figure35,

    Vcm+Vref/2 and Vcm-Vref/2 , so Vref=1.0V,input swing renge is 1.5V-0.5V? 

 

  • 0
    TI__Genius 12780 points

    Hello,

    Yes, if VCM = 1VDC and VREF = 1VDC, then the analog inputs (VIN+ and VIN-, 180 degrees out of phase) will swing from 1.5V to 0.5V (1 Vpp). When both of the inputs are subtracted in the ADC, then the effective signal swing is 2 Vpp.

    Best Regards,

    Dan