参数资料
型号: ATMEGA103-6AI
厂商: Atmel
文件页数: 123/141页
文件大小: 0K
描述: IC MCU 128K 6MHZ A/D IT 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 90
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 6MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 托盘
配用: ATSTK501-ND - ADAPTER KIT FOR 64PIN AVR MCU
82
ATmega103(L)
0945I–AVR–02/07
ADC Noise Canceling
Techniques
Digital circuitry inside and outside the ATmega103(L) 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.
The analog part of the ATmega103(L) and all analog components in the applica-
tion should have a separate analog ground plane on the PCB. This ground plane
is connected to the digital ground plane via a single point on the PCB.
2.
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.
3.
The AV
CC pin on the ATmega103(L) should have its own decoupling capacitor as
shown in Figure 49.
4.
Use the ADC Noise Canceler function to reduce induced noise from the CPU.
5.
If some Port F pins are used as digital inputs, it is essential that these do not
switch while a conversion is in progress.
Figure 49. ADC Power Connections
VCC
GND
10nF
Analog Ground Plane
ATmega103(L)
(ADC0) PF0
(ADC7) PF7
(ADC1) PF1
(ADC2) PF2
(ADC3) PF3
(ADC4) PF4
(ADC5) PF5
(ADC6) PF6
AREF
AGND
AVCC
52
53
54
55
56
57
58
59
60
61
62
63
64
1
51
PEN
(AD0) PA0
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