参数资料
型号: MC56F8014MFAE
厂商: Freescale Semiconductor
文件页数: 17/124页
文件大小: 0K
描述: IC DIGITAL SIGNAL CTLR 32-LQFP
标准包装: 1,250
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 32MHz
连通性: I²C,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 26
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
RAM 容量: 2K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 8x12b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 32-LQFP
包装: 托盘
Equivalent Circuit for ADC Inputs
56F8014 Technical Data, Rev. 11
Freescale Semiconductor
113
10.15 Equivalent Circuit for ADC Inputs
Figure 10-17 illustrates the ADC input circuit during sample and hold. S1 and S2 are always open/closed
at the same time that S3 is closed/open. When S1/S2 are closed & S3 is open, one input of the sample and
hold circuit moves to (VREFH-VREFL)/2, while the other charges to the analog input voltage. When the
switches are flipped, the charge on C1 and C2 are averaged via S3, with the result that a single-ended
analog input is switched to a differential voltage centered about (VREFH-VREFL)/2. The switches switch
on every cycle of the ADC clock (open one-half ADC clock, closed one-half ADC clock). Note that there
are additional capacitances associated with the analog input pad, routing, etc., but these do not filter into
the S/H output voltage, as S1 provides isolation during the charge-sharing phase.
One aspect of this circuit is that there is an on-going input current, which is a function of the analog input
voltage, VREF and the ADC clock frequency.
5. LSB = Least Significant Bit = 0.806mV
6. Pin groups are detailed following Table 10-1.
7. The current that can be injected or sourced from an unselected ADC signal input without impacting the performance of the
ADC.
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