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參數(shù)資料
| 型號： | 5962-0924001VXC |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP100 |
| 封裝： | HERMETIC SEALED, CERAMIC, QFP-100 |
| 文件頁數(shù)： | 33/46頁 |
| 文件大小： | 1109K |
| 代理商： | 5962-0924001VXC |
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Frequency MHz
0
10
20
30
40
50
60
70
80
90
100
PSRR
Power
Supply
Rejection
Ratio
dB
G022
0.01
0.1
1
100
10
DVDD3
AVDD3
AVDD5
SLAS669B
– SEPTEMBER 2010 – REVISED MAY 2011
Power Supplies
The ADS5400 uses three power supplies. For the analog portion of the design, a 5-V and 3.3-V supply (AVDD5
and AVDD3) are used, while the digital portion uses a 3.3-V supply (DVDD3). The use of low-noise power
supplies with adequate decoupling is recommended. Linear supplies are preferred to switched supplies; switched
supplies generate more noise components that can be coupled to the ADS5400. The PSRR value and the plot
shown in Figure 38 were obtained without bulk supply decoupling capacitors. When bulk (0.1
μF) decoupling
capacitors are used, the board-level PSRR is much higher than the stated value for the ADC. The power
consumption of the ADS5400 does not change substantially over clock rate or input frequency as a result of the
architecture and process.
Figure 38. PSRR versus Supply Injected Frequency
Copyright
2010–2011, Texas Instruments Incorporated
39
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