參數(shù)資料
型號： MB90F548GLSPF
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 54/67頁
文件大?。?/td> 746K
代理商： MB90F548GLSPF
MB90540/540G/545/545G Series
58
(Continued)
Notes on Using A/D Converter
Select the output impedance value for the external circuit of analog input according to the following conditions, :
Output impedance values of the external circuit of 15 k
or lower are recommended.
When capacitors are connected to external pins, the capacitance of several thousand times the internal
capacitor value is recommended to minimized the effect of voltage distribution between the external capacitor
and internal capacitor.
Note : When the output impedance of the external circuit is too high, the sampling period for analog voltages may
not be sufficient (sampling period
= 4.00 s @machine clock of 16 MHz) .
Error
The smaller the | AVRH
AVRL |, the greater the error would become relatively.
3FF
3FE
3FD
004
003
002
001
AVRL
AVRH
AVRL
AVRH
N
+ 1
N
1
N
2
VNT
V (N
+ 1) T
VOT
VFST
{1 LSB
× (N 1) + VOT }
Digital
output
Digital
output
Linearity error
Differential linearity error
Analog input
Actual conversion
value
(measured value)
Actual conversion
characteristics
Theoretical
characteristics
(measured value)
Theorential characteristics
Actual conversion value
(measured value)
Acturel conversion
value
Linearity error of
digital output N
[LSB]
VNT
{1 LSB × (N 1) + VOT}
1 LSB
[V]
VFST
VOT
1022
1 LSB
1 LSB [LSB]
V (N
+ 1) T VNT
1 LSB
Differential linearity error
of digital N
VOT : Voltage at transition of digital output from “000H” to “001H”
VFST : Voltage at transition of digital output from “3FEH” to “3FFH”
=
3.2 k
Max
30 pF Max
Analog input
Comparator
Equipment of analog input circuit model
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