PPC5606BAVLL6R datasheet(76/114 Pages) NXP

76 / 114 page

MPC5607B Microcontroller Data Sheet, Rev. 10

Electrical characteristics

NXP Semiconductors

Figure 16. ADC_0 characteristic and error definitions

4.16.2

Input impedance and ADC accuracy

In the following analysis, the input circuit corresponding to the precise channels is considered.

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; furthermore, 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

(2)

(1)

(3)

(4)

(5)

Offset Error (EO)

Gain Error (EG)

1 LSB (ideal)

1023

1022

1021

1020

1019

1018

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

PPC5606BAVLL6R 数据表(PDF) 76 Page - NXP Semiconductors

PPC5606BAVLL6R 数据表(HTML) 76 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载