參數(shù)資料
型號: MPC5604BEMLQ
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 60 MHz, MICROCONTROLLER, PQFP144
封裝: 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, LQFP-144
文件頁數(shù): 48/72頁
文件大?。?/td> 971K
代理商: MPC5604BEMLQ
MPC5604B/C Microcontroller Data Sheet Data Sheet, Rev. 4
Electrical characteristics
Freescale Semiconductor
52
4.18.5
ADC electrical characteristics
4.18.5.1
Introduction
The device provides a 10-bit Successive Approximation Register (SAR) analog-to-digital converter.
Figure 26. ADC characteristic and error definitions
4.18.5.2
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.
(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
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
MPC5604BxMG
products
in
208
MAPBGA
packages
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