參數資料
型號： MC56F8033VLC
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP32
封裝： ROHS COMPLIANT, PLASTIC, LQFP-32
文件頁數： 44/157頁
文件大?。?/td> 2117K
代理商： MC56F8033VLC
56F8033/56F8023 Data Sheet, Rev. 6
138
Freescale Semiconductor
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 and S3 is open, one input of the sample
and hold circuit moves to (VREFHx- VREFLx) / 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 (VREFHx-VREFLx) / 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.
1.
Parasitic capacitance due to package, pin-to-pin and pin-to-package base coupling; 1.8pF
2.
Parasitic capacitance due to the chip bond pad, ESD protection devices and signal routing; 2.04pF
3.
Equivalent resistance for the channel select mux; 100 ohms
4.
Sampling capacitor at the sample and hold circuit. Capacitor C1 is normally disconnected from the input and is only
connected to it at sampling time; 1.4pF
Figure 10-17 Equivalent Circuit for A/D Loading
10.16 Comparator (CMP) Parameters
7. The current that can be injected or sourced from an unselected ADC signal input without impacting the performance of the
ADC.
Table 10-20 CMP Parameters
Characteristic
Conditions/Comments
Symbol
Min
Typ
Max
Unit
Input Offset Voltage1
Within range of VDDA - .1V to
VSSA + .1V
VOFFSET
—
± 10
± 35
mV
1
2
3
Analog Input
4
S1
S2
S3
C1
C2
S/H
C1 = C2 = 1pF
(VREFHx - VREFLx ) / 2
125
Ω ESD Resistor
8pF noise damping capacitor
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MC56F8035VLDR 功能描述:數字信號處理器和控制器 - DSP, DSC 16 BIT DSPHC 64KB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT
MC56F8036 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers
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MC56F8036VLF 制造商:Freescale Semiconductor 功能描述:IC DSC 64KB 32MHZ 3.6V LQFP-48
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