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GD32H757ZMT7 Folha de dados(PDF) 110 Page - GigaDevice Semiconductor (Beijing) Inc.

Nome de Peças GD32H757ZMT7
Descrição Electrónicos  Arm® Cortex®-M7 32-bit MCU
PDF  151 Pages
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Fabricante Electrônico  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Página de início  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

GD32H757ZMT7 Folha de dados(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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