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參數(shù)資料
| 型號： | EVAL-AD7843EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/21頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7843 |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 125k |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | 0 ~ 5.25 V |
| 在以下條件下的電源（標準）： | 1.4mW @ 125kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7843 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD7843ARUZ-ND - IC ADC 12BIT TOUCHSCREEN 16TSSOP AD7843ARUZ-REEL7-ND - IC ADC 12BIT TOUCHSCREEN 16TSSOP AD7843ARQZ-ND - IC ADC 12BIT TOUCHSCREEN 16-QSOP AD7843ARQZ-REEL7-ND - IC ADC 12BIT TOUCHSCREEN 16-QSOP AD7843ARQZ-REEL-ND - IC ADC 12BIT TOUCHSCREEN 16-QSOP |
AD7843
Rev. B | Page 10 of 20
–120
–100
–80
–60
–40
–20
0
P
S
RR
(dB)
0
1020
3040
50
6070
8090
100
VCC RIPPLE FREQUENCY (kHz)
02144-B
-016
VCC = 3V, VREF = 2.5V
100mV p-p SINEWAVE ON +VCC
fSAMPLE = 125kHz, fIN = 20kHz
Figure 16. AC PSRR vs. Supply Ripple Frequency
Figure 16 shows the power supply rejection ratio versus VCC
supply frequency for the AD7843. The power supply rejection
ratio is defined as the ratio of the power in the ADC output at
full-scale frequency fS to the power of a 100 mV sine wave
applied to the ADC VCC supply of frequency fS:
PSRR (dB) = 10 log (Pf/Pfs)
where:
Pf is the power at frequency f in ADC output.
Pfs is the 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.
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