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GD32H757VMT7 bảng dữ liệu(PDF) 110 Page - GigaDevice Semiconductor (Beijing) Inc.

tên linh kiện GD32H757VMT7
Giải thích chi tiết về linh kiện  Arm® Cortex®-M7 32-bit MCU
PDF  151 Pages
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nhà sản xuất  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Trang chủ  http://www.gigadevice.com/
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GD32H757VMT7 bảng dữ liệu(HTML) 110 Page - GigaDevice Semiconductor (Beijing) Inc.

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GD32H757xx Datasheet
109
Equation 1: RAIN max formula RAIN <
Ts
fADC∗CADC∗ln(2N+2)
− RADC
The formula above Equation 1 is used to determine the maximum external impedance allowed for an
error below 1/4 of LSB. Here N = 14 (from 14-bit resolution).
Table 4-33. ADC RAIN max for fADC = 72 MHz (14-bit ADC) (1)(2)
Resolution
Sampling cycles @ 72 MHz
RAIN max (kΩ)
14 bits
3.5
0.21
6.5
0.52
12.5
1.15
24.5
2.40
47.5
4.80
92.5
9.50
247.5
25.6
810.5
84.4
12 bits
3.5
0.26
6.5
0.62
12.5
1.34
24.5
2.77
47.5
5.51
92.5
10.8
247.5
29.3
810.5
96.5
10 bits
3.5
0.33
6.5
0.75
12.5
1.58
24.5
3.25
47.5
6.45
92.5
12.7
247.5
34.2
810.5
112
8 bits
3.5
0.43
6.5
0.93
12.5
1.93
24.5
3.94
47.5
7.78
92.5
15.2
247.5
41.1
810.5
135
(1)
Value guaranteed by design, not 100% tested in production.
(2)
The RAIN value was calculated by theory and stray capacitance of actual pcb has not been taken into account.



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