參數(shù)資料
型號(hào): MPC5604PEFMLL7
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 64 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, MS-026BED, LQFP-100
文件頁(yè)數(shù): 35/72頁(yè)
文件大?。?/td> 1382K
代理商: MPC5604PEFMLL7
MPC5604P Microcontroller Data Sheet, Rev. 4
Freescale Semiconductor
40
3.13
Analog-to-Digital Converter (ADC) Electrical Characteristics
The device provides a 10-bit Successive Approximation Register (SAR) Analog-to-Digital Converter.
Figure 5. ADC Characteristics and Error Definitions
3.13.1
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 value of source impedance of the transducer or circuit supplying the analog signal to
(2)
(1)
(3)
(4)
(5)
Offset Error OSE
Gain Error GE
1 LSB (ideal)
Vin(A) (LSBideal)
(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
code out
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 LSB ideal = VDD_ADC / 1024
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