參數(shù)資料
型號(hào)： MC56F8025VLD
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, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù)： 52/161頁
文件大小： 2160K
代理商： MC56F8025VLD
Equivalent Circuit for ADC Inputs
56F8035/56F8025 Data Sheet, Rev. 6
Freescale Semiconductor
145
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
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.
1
2
3
Analog Input
4
S1
S2
S3
C1
C2
S/H
C1 = C2 = 1pF
(VREFHx - VREFL x) / 2
125
Ω ESD Resistor
8pF noise damping capacitor
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC56F8025VLDR 制造商:Freescale Semiconductor 功能描述:16-BIT DSC, 56800E CORE, 32KB FLASH, 32MHZ, QFP 44 - Tape and Reel 制造商:Freescale Semiconductor 功能描述:IC DSC 16BIT 32KB FLASH 44LQFP 制造商:Freescale Semiconductor 功能描述:16 BIT DSPHC
MC56F8027 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers
MC56F8027MLH 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 16 BIT DSPHC 32KB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):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(fēng)格:SMD/SMT
MC56F8027VLD 制造商:Freescale Semiconductor 功能描述:
MC56F8027VLH 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 16 BIT DSPHC 32KB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):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(fēng)格:SMD/SMT
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