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參數(shù)資料
| 型號： | EM78P5830ADQ |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-BIT MICRO-CONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 39/43頁 |
| 文件大小： | 396K |
| 代理商： | EM78P5830ADQ |
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EM785830AA
8-bit Micro-controller
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* This specification is subject to be changed without notice.
12/1/2004 V1.6
EM785830AA’s 10 bit ADC characteristic
EM785830AA build in 10 bit resolution, multi channel ADC function. In ideal, if ADC’s reference voltage is 5V,
the ADC’s LSB will be 5V/1024. But in practical, for some physics or circuit’s character, some un-ideal will effect the
converter result. As the next figure, offset voltage will reduce AD’s converter range. If AD’s input voltage less than VOFL,
ADC will output 0; in opposition, if input voltage is larger than (VDD-VOFH), ADC will output 1023. That is to say the
physics AD converter range will replace by (VDD-VOFH+LSB-VOFL+LSB). If we defined that VRB = VOFL – LSB and
VRT = VDD-VOFH+LSB, the physics LSB is:
LSB = (VRT - VRB) / 1024
=
(VDD – (VOFH+VOFL) ) / 1022
For real operating, please think about the effect of AD’s offset voltage. If converter the range of (VRT - VRB), the AD
converter’s opposite result will be précised.
10-bit ADC
0V
VDD
Min. input for ADC output = 1023
(For 10-bit ADC, internally it takes this range to
average 1024 steps)
VOFL
VOFH
VRB
VRT
Min. input for ADC output = 1
Fig.16 The relative between ADC and offset voltage
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