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| 型號(hào)： | ADC1015S065 |
| 廠商： | NXP Semiconductors N.V. |
| 中文描述： | Demoboard description Demo box content USB to SPI adaptor, USB cable, supply connectors CDROM (SPI software, datasheets, PCB layout-schematics, Quickstart guide) Extension module Data Acquisition for ADC with CMOS outputs mode (HSDC-EXTMOD01-DB) Data Acquisition for ADC with CMOS outputs mode (HSDC-EXTMOD01-DB), Supply adaptor 5 V to 1.8-3-5 V (HSDC-ACC09-DB), |
| 文件頁(yè)數(shù)： | 26/28頁(yè) |
| 文件大?。?/td> | 2924K |
| 代理商： | ADC1015S065 |
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NXP Semiconductors
Quick start ADC1415S, ADC1215S, ADC1115S, ADC1015S series
Quick start
NXP B.V. 2011. All rights reserved.
Quick start
Rev. 5 — January 2011
26 of 28
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4. Appendix A.1: coherency calculation
The coherency relies on the fact that clock and analog input signal are synchronized and
the first and last samples being captured are adjoining samples: it ensures a continuous
digitized time process for the FFT processing.
To achieve this, one has to
follow the equation:
where M is an odd integer equal to the number of periods being acquired and N the
number of samples acquired.
With Fin, Fs and N known, M has to be chosen such that it follows the equation above.
To do this iterative calculation, one has to decide whether Fin or Fs is fixed.
To illustrate this process, let’s consider our current example with Fin = 5 MHz, Fs =
122.88Msps and N = 65536 samples acquired:
if Fin is fixed, this leads to M = 2667 periods of input signal to be acquired and a real
sampling frequency to be Fs = 122.864642 MHz;
If Fs is fixed, this leads to M = 2667 periods of input signal to be acquired and a real
input frequency to be Fin = 5.000625 MHz.
Those values needs to be programmed in the signal generator and clock generator
before capture is done, otherwise the FFT calculation will lead to a non-coherent result
as shown below:
Fig 20. SW_ADC_1_r02: “Acquisition” page, non-coherent capture example
The numbers given for SNR, SFDR are completely wrong if coherency is not respected.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC1015S065/DB,598 | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADC DEMO BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADC1015S065HN,518 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC SNGLE 10b ADC 65MSPS WITH INPUT BUFFER RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC1015S065HN/C1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single 10-bit ADC; 65 Msps, 80 Msps, 105 Msps or 125 Msps Rev. 01 - 12 April 2010 Preliminary data sheet |
| ADC1015S065HN/C1,5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC SGL 10b ADC 65 MSPS INPUT BUFFER RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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