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HT32F1655 bảng dữ liệu(PDF) 37 Page - Holtek Semiconductor Inc

tên linh kiện HT32F1655
Giải thích chi tiết về linh kiện  32-bit ARM Cortex -M3 Microcontroller,up to 256KB Flash and 32KB SRAM with 1 MSPS
PDF  48 Pages
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
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HT32F1655 bảng dữ liệu(HTML) 37 Page - Holtek Semiconductor Inc

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Rev. 1.00
37 of �8
���� ��� �01�
3�-bit ARM® Cortex™-M3 MCU
HT3�F1656/HT3�F1655
SAR ADC
CI
sample
RI
RS
VS
Figure 7. ADC Sampling Network Model
The worst case occurs when the extremities of the input range (0V and VREF) are sampled
consecutively. In this situation a sampling error below ¼ LSB is ensured by using the following
equation:
I
N
I
ADC
S
R
C
f
R
−
<
+ )
2
ln(
5
.
1
2
where fADC is the ADC clock frequency and N is the ADC resolution (N = 12 in this case). A safe
margin should be considered due to the pin/pad parasitic capacitances, which are not accounted for
in this simple model.
If, in a system where the A/D Converter is used, there are no rail-to-rail input voltage variations
between consecutive sampling phases, Rs may be larger than the value indicated by the equation
above.



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