參數(shù)資料
型號: AD7873BRQ
廠商: ANALOG DEVICES INC
元件分類: 消費家電
英文描述: Touch Screen Digitizer
中文描述: SPECIALTY CONSUMER CIRCUIT, PDSO16
封裝: 0.150 INCH, MO-137AB, QSOP-16
文件頁數(shù): 12/28頁
文件大小: 657K
代理商: AD7873BRQ
AD7873
Rev. D | Page 12 of 28
–120
–100
–80
–60
–40
–20
0
P
0
10
20
30
40
50
60
70
80
90
100
V
CC
RIPPLE FREQUENCY (kHz)
0
V
= 3V
100mV p-p SINEWAVE ON +V
CC
V
REF
= 2.5V EXT REFERENCE
f
SAMPLE
= 125kHz,
f
IN
= 20kHz
Figure 23. AC PSRR vs. Supply Ripple Frequency
Figure 23 shows the power supply rejection ratio versus V
DD
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 V
CC
supply of frequency f
S
:
PSSR (dB)
= 10 log (
Pf/Pfs
)
where:
Pf
is power at frequency, f, in ADC output.
Pfs
is power at frequency,
f
S
, coupled onto the ADC V
CC
supply.
Here a 100 mV p-p sine wave is coupled onto the V
CC
supply.
Decoupling capacitors of 10 μF and 0.1 μF were used on the
supply.
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