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參數(shù)資料
| 型號： | MAX111 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, 2-Channel, 【14-Bit Serial ADCs |
| 中文描述： | 低成本、2通道、±14位串行ADC |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 411K |
| 代理商： | MAX111 |
M
Low-Cost, 2-Channel, ±14-Bit S erial ADCs
______________________________________________________________________________________
19
A 100ms conversion time cannot be achieved with either
10,240 CCPC or 20,480 CCPC modes because f
OSC
would be below the minimum 250kHz requirement.
When the gain calibration is performed, the conversion
times change approximately 1% to compensate for the
modulator’s gain error. This slightly degrades the line-
frequency rejection, because the corrected conversion
time is no longer an exact multiple of the line frequency.
Typically, the rejection of 50Hz/60Hz from the converter
is 55dB; i.e., if there is 100mV injection at the reference
or the analog input pin, it will cause an uncertainty of
±0.006%. If the system has large 50Hz/60Hz noise, the
use of internal auto gain calibration is not recommend-
ed. Instead, gain calibration should be done off-chip,
using numerical computation methods.
If you wish to use a configuration other than those sug-
gested in Table 6, you can accomplish similar 50Hz
and 60Hz line-frequency rejection off-chip by averag-
ing several conversions.
__________Applic ations Information
Layout, Grounding, Bypassing
For minimal noise, bypass each supply to GND with a
0.1μF capacitor. A ground plane should also be placed
under the analog circuitry. To minimize the coupling
effects of stray capacitance, keep digital lines as far
from analog components and lines as possible. Figure
10 shows the suggested power-supply and ground-
plane connections.
*R = 10
*OPTIONAL
DIGITAL
CIRCUITRY
POWER
SUPPLIES
V
DD
V
SS
+5V
DGND
+5V
-5V
GND
GND
4.7
μ
F
0.1
μ
F
0.1
μ
F
4.7
μ
F
MAX110
Figure 10a. MAX110 Power-Supply Grounding Connections
*R = 10
*OPTIONAL
DIGITAL
CIRCUITRY
POWER
SUPPLIES
V
DD
AGND
+5V
DGND
+5V
GND
GND
4.7
μ
F
0.1
μ
F
MAX111
Figure 10b. MAX111 Power-Supply Grounding Connections
CCPC = Clock Cycles per Conversion
Table 6. Suggested XCLK Frequencies to Achieve Maximum Rejection of Both 50Hz/60Hz Line
Frequencies
MAX111 (t
CONVERT
= 200ms)
81,240 CCPC
102,400 CCPC
DIVIDER
RATIO
f
XCLK
(MHz)
RELATIVE
ACCURACY
(%)
f
XCLK
(MHz)
RELATIVE
ACCURACY
(%)
1:1
2:1
4:1
0.4062
0.8124
1.6248
0.030
0.025
0.022
0.512
1.024
2.048
0.030
0.025
0.023
MAX110 (t
CONVERT
= 100ms)
81,240 CCPC
102,400 CCPC
DIVIDER
RATIO
f
XCLK
(MHz)
RELATIVE
ACCURACY
(%)
f
XCLK
(MHz)
RELATIVE
ACCURACY
(%)
1:1
2:1
4:1
0.8124
1.6248
3.2496
0.025
0.018
0.016
1.024
2.048
4.096
0.065
0.045
0.030
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| MAX11100EUB+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 5V 200ksps w/10uA Shutdown RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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