2-102 Revision 4 This process results in a binary approximation of VIN. Generally, there is a fixed interval T, the sampling p" />
參數(shù)資料
型號(hào): M1AFS1500-1FGG484I
廠商: Microsemi SoC
文件頁(yè)數(shù): 22/334頁(yè)
文件大?。?/td> 0K
描述: IC FPGA 8MB FLASH 1.5M 484-FBGA
標(biāo)準(zhǔn)包裝: 60
系列: Fusion®
RAM 位總計(jì): 276480
輸入/輸出數(shù): 223
門數(shù): 1500000
電源電壓: 1.425 V ~ 1.575 V
安裝類型: 表面貼裝
工作溫度: -40°C ~ 100°C
封裝/外殼: 484-BGA
供應(yīng)商設(shè)備封裝: 484-FPBGA(23x23)
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Device Architecture
2-102
Revision 4
This process results in a binary approximation of VIN. Generally, there is a fixed interval T, the sampling
period, between the samples. The inverse of the sampling period is often referred to as the sampling
frequency fS = 1 / T. The combined effect is illustrated in Figure 2-82.
Figure 2-82 demonstrates that if the signal changes faster than the sampling rate can accommodate, or if
the actual value of VIN falls between counts in the result, this information is lost during the conversion.
There are several techniques that can be used to address these issues.
First, the sampling rate must be chosen to provide enough samples to adequately represent the input
signal. Based on the Nyquist-Shannon Sampling Theorem, the minimum sampling rate must be at least
twice the frequency of the highest frequency component in the target signal (Nyquist Frequency). For
example, to recreate the frequency content of an audio signal with up to 22 KHz bandwidth, the user
must sample it at a minimum of 44 ksps. However, as shown in Figure 2-82, significant post-processing
of the data is required to interpolate the value of the waveform during the time between each sample.
Similarly, to re-create the amplitude variation of a signal, the signal must be sampled with adequate
resolution. Continuing with the audio example, the dynamic range of the human ear (the ratio of the
amplitude of the threshold of hearing to the threshold of pain) is generally accepted to be 135 dB, and the
dynamic range of a typical symphony orchestra performance is around 85 dB. Most commercial
recording media provide about 96 dB of dynamic range using 16-bit sample resolution. But 16-bit fidelity
does not necessarily mean that you need a 16-bit ADC. As long as the input is sampled at or above the
Nyquist Frequency, post-processing techniques can be used to interpolate intermediate values and
reconstruct the original input signal to within desired tolerances.
If sophisticated digital signal processing (DSP) capabilities are available, the best results are obtained by
implementing a reconstruction filter, which is used to interpolate many intermediate values with higher
resolution than the original data. Interpolating many intermediate values increases the effective number
of samples, and higher resolution increases the effective number of bits in the sample. In many cases,
however, it is not cost-effective or necessary to implement such a sophisticated reconstruction algorithm.
For applications that do not require extremely fine reproduction of the input signal, alternative methods
can enhance digital sampling results with relatively simple post-processing. The details of such
techniques are out of the scope of this chapter; refer to the Improving ADC Results through
Oversampling and Post-Processing of Data white paper for more information.
Figure 2-82 Conversion Example
T
LSB
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M1AFS1500-1FGG484K 功能描述:IC FPGA 8MB FLASH 1.5M 484-FBGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - FPGA(現(xiàn)場(chǎng)可編程門陣列) 系列:Fusion® 標(biāo)準(zhǔn)包裝:1 系列:ProASICPLUS LAB/CLB數(shù):- 邏輯元件/單元數(shù):- RAM 位總計(jì):129024 輸入/輸出數(shù):248 門數(shù):600000 電源電壓:2.3 V ~ 2.7 V 安裝類型:表面貼裝 工作溫度:- 封裝/外殼:352-BFCQFP,帶拉桿 供應(yīng)商設(shè)備封裝:352-CQFP(75x75)
M1AFS1500-1FGG676 功能描述:IC FPGA 8MB FLASH 1.5M 676-FBGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - FPGA(現(xiàn)場(chǎng)可編程門陣列) 系列:Fusion® 產(chǎn)品培訓(xùn)模塊:Three Reasons to Use FPGA's in Industrial Designs Cyclone IV FPGA Family Overview 特色產(chǎn)品:Cyclone? IV FPGAs 標(biāo)準(zhǔn)包裝:60 系列:CYCLONE® IV GX LAB/CLB數(shù):9360 邏輯元件/單元數(shù):149760 RAM 位總計(jì):6635520 輸入/輸出數(shù):270 門數(shù):- 電源電壓:1.16 V ~ 1.24 V 安裝類型:表面貼裝 工作溫度:0°C ~ 85°C 封裝/外殼:484-BGA 供應(yīng)商設(shè)備封裝:484-FBGA(23x23)
M1AFS1500-1FGG676I 功能描述:IC FPGA 8MB FLASH 1.5M 676-FBGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - FPGA(現(xiàn)場(chǎng)可編程門陣列) 系列:Fusion® 標(biāo)準(zhǔn)包裝:1 系列:ProASICPLUS LAB/CLB數(shù):- 邏輯元件/單元數(shù):- RAM 位總計(jì):129024 輸入/輸出數(shù):248 門數(shù):600000 電源電壓:2.3 V ~ 2.7 V 安裝類型:表面貼裝 工作溫度:- 封裝/外殼:352-BFCQFP,帶拉桿 供應(yīng)商設(shè)備封裝:352-CQFP(75x75)
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