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| 型号： | MPC5604PEF0VLL4R |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT LQFP-100 |
| 文件页数： | 62/99页 |
| 文件大小： | 1130K |
| 代理商： | MPC5604PEF0VLL4R |
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MPC5604P Microcontroller Data Sheet, Rev. 7
Freescale Semiconductor
65
Figure 14. ADC characteristics and error definitions
3.14.1
Input impedance and ADC accuracy
To preserve the accuracy of the A/D converter, it is necessary that analog input pins have low AC impedance. Placing a capacitor
with good high frequency characteristics at the input pin of the device can be effective: the capacitor should be as large as
possible, ideally infinite. This capacitor contributes to attenuating the noise present on the input pin; further, it sources charge
during the sampling phase, when the analog signal source is a high-impedance source.
A real filter can typically be obtained by using a series resistance with a capacitor on the input pin (simple RC filter). The RC
filtering may be limited according to the source impedance value of the transducer or circuit supplying the analog signal to be
measured. The filter at the input pins must be designed taking into account the dynamic characteristics of the input signal
(bandwidth) and the equivalent input impedance of the ADC itself.
(2)
(1)
(3)
(4)
(5)
Offset Error OSE
Gain Error GE
1 LSB (ideal)
1023
1022
1021
1020
1019
1018
5
4
3
2
1
0
7
6
1
2
3
4
5
6
7
1017 1018 1019 1020 1021 1022 1023
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) Differential non-linearity error (DNL)
(4) Integral non-linearity error (INL)
(5) Center of a step of the actual transfer curve
1 LSB ideal = VDD_ADC / 1024
Vin(A) (LSBideal)
code out
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相关代理商/技术参数 |
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| MPC5604PEF0VLL7R | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:microcontroller units (MCUs) |
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