MPC5601DXLL datasheet(52/77 Pages) FREESCALE

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MPC5602D Microcontroller Data Sheet, Rev. 3.1

Preliminary—Subject to Change Without Notice

Electrical characteristics

Freescale Semiconductor

4.17

ADC electrical characteristics

4.17.1

Introduction

The device provides a 12-bit Successive Approximation Register (SAR) analog-to-digital converter.

Figure 11. ADC characteristic and error definitions

4.17.2

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

(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

1017 1018 1019 1020 1021 1022 1023

1 LSB ideal = VDD_ADC / 1024

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