參數(shù)資料
型號： MB90497GPMC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP64
封裝： 12 X 12 MM, 1.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, LFQFP-64
文件頁數(shù)： 80/96頁
文件大?。?/td> 2317K
代理商： MB90497GPMC
MB90495G Series
DS07-13713-6E
81
(Continued)
7.
Notes on Using A/D Converter
Select the output impedance value for the external circuit of analog input according to the following conditions :
External circuit output impedance values of about 5 k
Ω or lower are recommended.
If external capacitors are used, a capacitance of several thousand times the internal capacitor value is recom-
mended in order to minimize the effect of voltage distribution between the external and internal capacitor.
If the output impedance of the external circuit is too high, the sampling time for analog voltages may not be
sufficient (sampling period
= 2.00 μs @ machine clock of 16 MHz) .
About Error
The smaller the absolute value of | AVR - AVSS |, the greater the relative error.
3FF
3FE
3FD
004
003
002
001
AVSS
AVR
AVSS
AVR
N + 1
N
1
N
2
VNT
VOT (actual measurement)
VFST
{1 LSB
× (N 1)
+ VOT }
Actual conversion
characteristics
(actual
measurement)
(actual
measurement)
Actual conversion
characteristics
Ideal characteristics
Actual conversion
characteristics
Actual conversion
characteristics
Ideal
characteristics
Digital
output
Digital
output
Analog input
VNT (actual measurement)
V (N + 1) T
(actual
measurement)
Linearity error
Differential linearity error
Linearity error of digital output N
=
VNT
{1 LSB × (N 1) + VOT}
1 LSB
[LSB]
Differential linearity error of digital output N
=
V (N
+ 1) T VNT
1 LSB
1 LSB [LSB]
VFST
VOT
1022
[V]
1 LSB
=
VOT : Voltage for transition from digital output 000H to 001H.
VFST : Voltage for transition from digital output 3FEH to 3FFH.
C
Comparator
Analog input
R
Note : The figures given here are the suggested values.
MB90F497G, MB90F498G, MB90V495G R 3.2 k
Ω, C 30 pF
MB90497G
R 2.6 k
Ω, C 28 pF
Model Analog Input Circuit
相關(guān)PDF資料
PDF描述
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