参数资料
型号: MB90F498GPFM
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP64
封装: PLASTIC, LQFP-64
文件页数: 77/90页
文件大小: 849K
代理商: MB90F498GPFM
MB90495G Series
79
(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
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 s @ 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
, C 30 pF
MB90497G
R 2.6 k
, C 28 pF
Model Analog Input Circuit
相关PDF资料
PDF描述
MB90497GPFM 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP64
MB90F498GPMC 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP64
MB90497GPMC 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP64
MB90F574/APFF 16-BIT, FLASH, MICROCONTROLLER, PQFP120
MB90F997MBSPMC 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP48
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