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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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AD7873ACPZ Scheda tecnica(PDF) 13 Page - Analog Devices |
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AD7873ACPZ Scheda tecnica(HTML) 13 Page - Analog Devices |
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13 / 29 page  AD7873 Data Sheet Rev. F | Page 12 of 28 Figure 23. AC PSRR vs. Supply Ripple Frequency Figure 23 shows the power supply rejection ratio vs. VDD supply frequency for the AD7873. The power supply rejection ratio is defined as the ratio of the power in the ADC output at full-scale frequency, f, to the power of a 100 mV sine wave applied to the ADC VCC supply of frequency fS PSSR (dB) = 10log(Pf/Pfs) where: Pf is power at frequency, f, in ADC output. Pfs is power at frequency, fs, coupled onto the ADC VCC supply. Here a 100 mV p-p sine wave is coupled onto the VCC supply. Decoupling capacitors of 10 µF and 0.1 µF were used on the supply. –120 –100 –80 –60 –40 –20 0 0 10 20 30 40 50 60 70 80 90 100 VCC RIPPLE FREQUENCY (kHz) VCC = 3V 100mV p-p SINE WAVE ON +VCC VREF = 2.5V EXT REFERENCE fSAMPLE = 125kHz, fIN = 20kHz |
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