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STM32F103C8T7XXX Datasheet(PDF) 71 Page - STMicroelectronics

Part # STM32F103C8T7XXX
Description  Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
PDF  92 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F103C8T7XXX Datasheet(HTML) 71 Page - STMicroelectronics

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STM32F103x8, STM32F103xB
Electrical characteristics
Doc ID 13587 Rev 11
71/92
Figure 32.
Typical connection diagram using the ADC
1.
Refer to Table 45 for the values of RAIN, RADC and CADC.
2.
Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the
pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy
this, fADC should be reduced.
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 33 or Figure 34,
depending on whether VREF+ is connected to VDDA or not. The 10 nF capacitors should be
ceramic (good quality). They should be placed them as close as possible to the chip.
Figure 33.
Power supply and reference decoupling (VREF+ not connected to VDDA)
1.
VREF+ and VREF– inputs are available only on 100-pin packages.
ai14150c
STM32F103xx
VDD
AINx
IL±1 µA
0.6 V
VT
RAIN(1)
Cparasitic
VAIN
0.6 V
VT
RADC(1)
12-bit
converter
CADC(1)
Sample and hold ADC
converter
VREF+
(see note 1)
STM32F103xx
VDDA
VSSA /VREF–
(see note 1)
1 µF // 10 nF
1 µF // 10 nF
ai14388b



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