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Document Number: 001-44369 Rev. *B Page 29 of 37
When bypassed by a capacitor on P2[4], the noise of the analog ground signal distributed to each block is reduced by a factor of up
to 5 (14 dB). This is at frequencies above the corner frequency defined by the on-chip 8.1k resistance and the external capacitor.
Figure 15. Typical AGND Noise with P2[4] Bypass
At low frequencies, the opamp noise is proportional to 1/f, power independent, and determined by device geometry. At high
frequencies, increased power level reduces the noise spectrum level.
Figure 16. Typical Opamp Noise
100
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0.001 0.01 0.1 1 10 100Freq (kHz)
dBV/rtHz
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0.1
1.0
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0.001 0.01 0.1 1 10 100
Freq (kHz)
nV/rtHz
PH_BH
PH_BL
PM_BL
PL_BL
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