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參數資料
| 型號： | AD7569TE |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, CQCC28 |
| 封裝： | CERAMIC, LCC-28 |
| 文件頁數： | 13/20頁 |
| 文件大?。?/td> | 504K |
| 代理商： | AD7569TE |
AD7569/AD7669
–13–
REV. B
Figure 15. DAC Output Spectrum
HISTOGRAM PLOT
When a sine wave of specified frequency is applied to the V
IN
in-
put of the AD7569/AD7669 and several thousand samples are
taken, it is possible to plot a histogram showing the frequency of
occurrence of each of the 256 ADC codes. If a particular step is
wider than the ideal 1 LSB width, the code associated with that
step will accumulate more counts than for the code for an ideal
step. Likewise, a step narrower than ideal width will have fewer
counts. Missing codes are easily seen because a missing code
means zero counts for a particular code. The absence of large
spikes in the plot indicates small differential nonlinearity.
Figure 16 shows a histogram plot for the ADC indicating very
small differential nonlinearity and no missing codes for an input
frequency of 204 kHz. For a sine-wave input, a perfect ADC
would produce a cusp probability density function described by
the equation
p
(
V
)
=
1
π
(
A
2
V
2
)
1/2
where
A
is the peak amplitude of the sine wave and
p
(
V
) the
probability of occurrence at a voltage
V
.
The histogram plot of Figure 16 corresponds very well with this
cusp shape.
Further typical plots of the performance of the AD7569/AD7669
are shown in the Typical Performance Graphs section of the data
sheet.
Figure 16. ADC Histogram Plot
and harmonic distortion performance. Similarly, for inter-
modulation distortion, an input (either to V
IN
or DAC code)
consisting of pure sine waves at two frequencies is applied to the
AD7569/AD7669.
Figure 13. ADC FFT Plot
Figure 13 shows a 2048 point FFT plot of the ADC with an in-
put signal of 130 kHz. The SNR is 48.4 dB. It can be seen that
most of the harmonics are buried in the noise floor. It should be
noted that the harmonics are taken into account when calculat-
ing the SNR. The relationship between SNR and resolution (N)
is expressed by the following equation:
SNR
= (6.02
N
+ 1.76)
dB
This is for an ideal part with no differential or integral linearity
errors. These errors will cause a degradation in SNR. By work-
ing backward from the above equation, it is possible to get a
measure of ADC performance expressed in effective number of
bits (N). This effective number of bits is plotted versus fre-
quency in Figure 14. The effective number of bits typically falls
between 7.7 and 7.8, corresponding to SNR figures of 48.1 dB
and 48.7 dB.
Figure 15 shows a spectrum analyzer plot of the output spec-
trum from the DAC with an ideal sine-wave table loaded to the
data inputs of the DAC. In this case, the SNR is 46 dB.
Figure 14. Effective Number of Bits vs. Frequency
相關PDF資料 |
PDF描述 |
|---|---|
| AD7569KN | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| AD7569KP | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| AD7569TQ | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| AD7669AR | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| AD7569 | Complete, 8-Bit Analog I/0 Systems(完備的8位模擬I/O系統) |
相關代理商/技術參數 |
參數描述 |
|---|---|
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| AD7572AAN03 | 制造商:Analog Devices 功能描述:ADC Single SAR 12-bit Parallel 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:12-BIT ADC IC - Bulk |
| AD7572AAN10 | 制造商:Analog Devices 功能描述:ADC Single SAR 12-bit Parallel 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:12-BIT ADC IC - Bulk |
| AD7572AANZ03 | 功能描述:IC ADC 12BIT HS LC2MOS 24DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
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