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AD7873ACPZ 데이터시트(PDF) 13 Page - Analog Devices

부품명 AD7873ACPZ
상세설명  Touch Screen Digitizer
PDF  29 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD7873ACPZ 데이터시트(HTML) 13 Page - Analog Devices

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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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