Figure 23 shows the power supply rejection ra" />
參數(shù)資料
型號: AD7873BRQZ-REEL
廠商: Analog Devices Inc
文件頁數(shù): 5/29頁
文件大小: 0K
描述: IC ADC 12BIT TOUCHSCREEN 16QSOP
標準包裝: 2,500
類型: 電阻
觸摸面板接口: 4 線
輸入數(shù)/鍵: 1 TSC
分辨率(位): 12 b
評估套件: 可供
數(shù)據(jù)接口: 串行
數(shù)據(jù)速率/采樣率 (SPS,BPS): 125k
電壓基準: 外部,內(nèi)部
電源電壓: 2.2 V ~ 5.25 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-QSOP
包裝: 帶卷 (TR)
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 F and 0.1 F were used on the supply.
–120
–100
–80
–60
–40
–20
0
P
S
RR
(
d
B)
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
02164-
023
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