參數(shù)資料
型號: R5F212ACSDFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP48
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù): 63/138頁
文件大?。?/td> 492K
代理商: R5F212ACSDFP
242
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
Figure 21-8. Analog Input Circuitry
21.6.2
Analog Noise Canceling Techniques
Digital circuitry inside and outside the device generates EMI which might affect the accuracy of
analog measurements. If conversion accuracy is critical, the noise level can be reduced by
applying the following techniques:
1.
Keep analog signal paths as short as possible. Make sure analog tracks run over the
analog ground plane, and keep them well away from high-speed switching digital
tracks.
2.
The AV
CC pin on the device should be connected to the digital VCC supply voltage via
an LC network as shown in Figure 21-9.
3.
Use the ADC noise canceler function to reduce induced noise from the CPU.
4.
If any ADC port pins are used as digital outputs, it is essential that these do not
switch while a conversion is in progress.
Figure 21-9. ADC Power Connections
ADCn
IIH
1..100 k
Ω
CS/H= 14 pF
VCC/2
IIL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
GND
(ADC0) PE2
(ADC1) PD4
PB7(ADC4)
PB6 (ADC7)
PB5 (ADC6)
PC7 (D2A)
PB4 (AMP0+)
PB3 (AMP0-)
PC6 (ADC10/ACMP1)
AREF
AGND
AVCC
PC5 (ADC9/AMP1+)
PC4 (ADC8/AMP1-)
PB2 (ADC5)
PD7 (ACMP0)
PD6 (ADC3/ACMPM)
PD5 (ADC2/ACMP2)
100nF
Analog Ground Plane
10
μH
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