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AD7873ACP 데이터시트(PDF) 12 Page - Analog Devices

부품명 AD7873ACP
상세설명  Touch Screen Digitizer
PDF  28 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD7873ACP 데이터시트(HTML) 12 Page - Analog Devices

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AD7873
Rev. D | Page 12 of 28
–120
–100
–80
–60
–40
–20
0
0
1020
3040
50
6070
8090
100
VCC RIPPLE FREQUENCY (kHz)
VCC = 3V
100mV p-p SINEWAVE ON +VCC
VREF = 2.5V EXT REFERENCE
fSAMPLE = 125kHz, fIN = 20kHz
Figure 23. AC PSRR vs. Supply Ripple Frequency
Figure 23 shows the power supply rejection ratio versus 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) = 10 log (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.



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