PPC5604BAMLL4R datasheet(72/109 Pages) NXP

72 / 109 page

MPC5604B/C Microcontroller Data Sheet, Rev. 15

Package pinouts and signal descriptions

NXP Semiconductors

2.26

ADC electrical characteristics

2.26.1

Introduction

The device provides a 10-bit Successive Approximation Register (SAR) analog-to-digital converter.

Figure 19. ADC characteristic and error definitions

2.26.2

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

(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

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