AD8276 Noise

I have the AD8276 model in LTSpice running a noise analysis.  The results are far above expected from datasheet.  Could I please get some help with this?

AD8276SpiceNoise.pdf

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  • The noise models are:

    ***Voltage Noise Generation
    HVnoise 9 7 Vvnoise 1
    VVnoise 501 0 0
    DVnoise 501 0 Dvnoise
    RVnoise 501 0 3.37959E-06
    ***Current Noise Generation on +IN
    FInoise1 12 0 VInoise1 1
    VInoise1 502 0 0
    DInoise1 502 0 DInoise1
    RInoise1 502 0 287500
    ***Current Noise Generation on -IN
    FInoise2 2 0 VInoise2 1
    VInoise2 503 0 0
    DInoise2 503 0 DInoise2
    RInoise2 503 0 287500

    .model Rideal res T_ABS=27
    .model Rnoise res T_ABS=27
    .model npn npn BF= 8333332.33333333
    .model dquiet d
    .model dvnoise d KF=980000
    .model dinoise1 d KF=0.000576
    .model dinoise2 d KF=0.000576
    .model dzener d BV=38.9444143409777
    .model dzener2 d BV=50

    Similar for the AD8278

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  • The noise models are:

    ***Voltage Noise Generation
    HVnoise 9 7 Vvnoise 1
    VVnoise 501 0 0
    DVnoise 501 0 Dvnoise
    RVnoise 501 0 3.37959E-06
    ***Current Noise Generation on +IN
    FInoise1 12 0 VInoise1 1
    VInoise1 502 0 0
    DInoise1 502 0 DInoise1
    RInoise1 502 0 287500
    ***Current Noise Generation on -IN
    FInoise2 2 0 VInoise2 1
    VInoise2 503 0 0
    DInoise2 503 0 DInoise2
    RInoise2 503 0 287500

    .model Rideal res T_ABS=27
    .model Rnoise res T_ABS=27
    .model npn npn BF= 8333332.33333333
    .model dquiet d
    .model dvnoise d KF=980000
    .model dinoise1 d KF=0.000576
    .model dinoise2 d KF=0.000576
    .model dzener d BV=38.9444143409777
    .model dzener2 d BV=50

    Similar for the AD8278

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