Cypress Semiconductor CY8C24894 Instrukcja Użytkownika Pobierz pdf (Strona 33)

CY8C24094, CY8C24794

CY8C24894, CY8C24994

Document Number: 38-12018 Rev. *Q Page 33 of 48

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 10-4. 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 10-5. Typical Opamp Noise

100

1000

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0.001 0.01 0.1 1 10 100Freq (kHz)

dBV/rtHz

0.01

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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Cypress Semiconductor CY8C24894 Instrukcja Użytkownika Strona 33