參數(shù)資料
型號: SPC5604BF2MLQ6
廠商: Freescale Semiconductor
文件頁數(shù): 81/109頁
文件大?。?/td> 0K
描述: IC MCU 32BIT 512KB FLASH 144LQFP
標準包裝: 60
系列: MPC56xx Qorivva
核心處理器: e200z0h
芯體尺寸: 32-位
速度: 64MHz
連通性: CAN,I²C,LIN,SCI,SPI
外圍設(shè)備: DMA,POR,PWM,WDT
輸入/輸出數(shù): 123
程序存儲器容量: 512KB(512K x 8)
程序存儲器類型: 閃存
RAM 容量: 32K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 36x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 144-LQFP
包裝: 托盤
Package pinouts and signal descriptions
MPC5604B/C Microcontroller Data Sheet, Rev. 11.1
Freescale Semiconductor
73
Figure 23. Spectral representation of input signal
Calling f0 the bandwidth of the source signal (and as a consequence the cut-off frequency of the anti-aliasing filter, fF),
according to the Nyquist theorem the conversion rate fC must be at least 2f0; it means that the constant time of the filter is greater
than or at least equal to twice the conversion period (tc). Again the conversion period tc is longer than the sampling time ts,
which is just a portion of it, even when fixed channel continuous conversion mode is selected (fastest conversion rate at a
specific channel): in conclusion it is evident that the time constant of the filter RFCF is definitively much higher than the
sampling time ts, so the charge level on CS cannot be modified by the analog signal source during the time in which the sampling
switch is closed.
The considerations above lead to impose new constraints on the external circuit, to reduce the accuracy error due to the voltage
drop on CS; from the two charge balance equations above, it is simple to derive Equation 11 between the ideal and real sampled
voltage on CS:
Eqn. 11
From this formula, in the worst case (when VA is maximum, that is for instance 5 V), assuming to accept a maximum error of
half a count, a constraint is evident on CF value:
Eqn. 12
f0
f
Analog source bandwidth (VA)
f0
f
Sampled signal spectrum (fC = conversion rate)
fC
f
Anti-aliasing filter (fF = RC filter pole)
fF
2 f0 < fC (Nyquist)
fF = f0 (anti-aliasing filtering condition)
tc < 2 RFCF (conversion rate vs. filter pole)
Noise
VA2
VA
------------
CP1 CP2
+CF
+
CP1 CP2
+CF CS
++
--------------------------------------------------------
=
CF 2048 CS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SPC5604BF2VLQ6 制造商:Freescale Semiconductor 功能描述:
SPC5604BK0MLQ6 功能描述:e200z0h MPC56xx Qorivva Microcontroller IC 32-Bit 64MHz 512KB (512K x 8) FLASH 144-LQFP (20x20) 制造商:nxp usa inc. 系列:MPC56xx Qorivva 包裝:托盤 零件狀態(tài):在售 核心處理器:e200z0h 核心尺寸:32-位 速度:64MHz 連接性:CAN,I2C,LIN,SCI,SPI 外設(shè):DMA,POR,PWM,WDT I/O 數(shù):123 程序存儲容量:512KB(512K x 8) 程序存儲器類型:閃存 EEPROM 容量:4K x 16 RAM 容量:32K x 8 電壓 - 電源(Vcc/Vdd):3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 36x10b 振蕩器類型:內(nèi)部 工作溫度:-40°C ~ 125°C(TA) 封裝/外殼:144-LQFP 供應(yīng)商器件封裝:144-LQFP(20x20) 標準包裝:300
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