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APM32F103C8T6-R датащи(PDF) 53 Page - Geehy Semiconductor Co., Ltd.

номер детали APM32F103C8T6-R
подробное описание детали  Arm® Cortex® -M3 based 32-bit MCU
PDF  78 Pages
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производитель  GEEHY [Geehy Semiconductor Co., Ltd.]
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APM32F103C8T6-R датащи(HTML) 53 Page - Geehy Semiconductor Co., Ltd.

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P a g e 52
Symbol
Parameter
Condition
Minimum
value
Typical
value
Maximu
m value
Unit
tS
Sampling time
fADC = 14MHz
0.107
-
17.1
μs
-
1.5
-
239.5
1/fADC
tCONV
Total conversion time (including
sampling time)
fADC = 14MHz
1
-
18
μs
-
14~252 (sampling tS + gradually
approaching 12.5
1/fADC
1.
Guaranteed by comprehensive evaluation and not tested in production.
2.
Cparasitic refers to the parasitic capacitance (about 7PF) on the PCB (related to the welding and
PCB layout quality) and the pad. Large Cparasitic value will reduce the conversion accuracy. The
solution is to reduce fADC.
Figure 19 Typical Application of ADC
RADC(1)
CADC(1)
VDD
VT
VT
IL±1μA
VAIN
RAIN(1)
0.6V
0.6V
AINx
寄生电容
12bit
转换器
GND
The calculation formula for maximum value of external input impedance is as follows:
Formula 1: Maximum RAIN formula
RAIN<
-RADC
Where fADC=14MHZ, CADC=12PF (Table41), RADC=1kΩ (Table41); the relationship
between TS and RAIN under the condition of 0.25LSB sampling error accuracy is shown in the
following table:
Table42 Maximum RAIN at fADC=14MHz (1)
TS (cycle)
tS（
μs）
Maximum RAIN
(kΩ)
Converter



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