參數(shù)資料
型號: MC56F8011VFAE
廠商: Freescale Semiconductor
文件頁數(shù): 19/126頁
文件大?。?/td> 0K
描述: IC DIGITAL SIGNAL CTLR 32-LQFP
標(biāo)準(zhǔn)包裝: 250
系列: 56F8xxx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 32MHz
連通性: I²C,SCI,SPI
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 26
程序存儲器容量: 12KB(6K x 16)
程序存儲器類型: 閃存
RAM 容量: 1K x 16
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 6x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 32-LQFP
包裝: 托盤
配用: CPA56F8013-ND - BOARD SOCKET FOR MC56F8013
APMOTOR56F8000E-ND - KIT DEMO MOTOR CTRL SYSTEM
Equivalent Circuit for ADC Inputs
56F8013/56F8011 Data Sheet, Rev. 12
Freescale Semiconductor
115
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. For device S56F8013MFA00E, input leakage current is ± 1
μA.
8. 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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