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參數資料
| 型號： | AD7869AQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS Complete, 14-Bit Analog I/O System |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP24 |
| 封裝： | 0.300 INCH, HERMETIC SEALED, CERDIP-24 |
| 文件頁數： | 10/16頁 |
| 文件大小： | 297K |
| 代理商： | AD7869AQ |
AD7869
–10–
REV. A
Performance versus Frequency
T he typical performance plots of Figures 14 and 15 show the
AD7869 DAC performance over a wide range of input frequen-
cies at an update rate of 83 kHz. T he plot of Figure 14 is with-
out a sample-and-hold on the DAC output while the plot of
Figure 15 is generated with a sample-and-hold on the output.
Figure 14. DAC Performance vs. Frequency (No
Sample-and-Hold)
Figure 15. DAC Performance vs. Frequency (Sample-and-
Hold)
T he digitizer sampling is synchronized with the DAC update
rate to ease FFT calculations. T he digitizer samples the DAC
output after the output has settled to its new value. T herefore, if
the digitizer were to directly sample the output, it would effec-
tively be sampling a dc value each time. As a result, the dynamic
performance of the DAC would not be measured correctly. Us-
ing the digitizer directly on the DAC output would give better
results than the actual performance of the DAC. Using a filter
between the DAC and the digitizer means that the digitizer
samples a continuously moving signal, and the true dynamic
performance of the AD7869 DAC output is measured.
Figure 12 shows a typical 2048 point Fast Fourier T ransform
plot for the AD7869 DAC with an update rate of 83 kHz and an
output frequency of 1 kHz. T he SNR obtained from the graph is
82 dBs.
Figure 12. DAC FFT Plot
Some applications will require improved performance versus fre-
quency from the AD7869 DAC. In these applications, a simple
sample-and-hold circuit such as that outlined in Figure 13 will
extend the very good performance of the DAC to 20 kHz. Other
applications will already have an inherent sample-and-hold
function following the AD7869 DAC output. An example of
this type of application is driving a switched capacitor filter
where the updating of the DAC is synchronized with the
switched capacitor filter. T his inherent sample-and-hold func-
tion also extends the frequency range performance.
AD7869*
LDAC
LDAC
V
OUT
Q
ADG201HS
S1
D1
IN1
AD711
*ADDITIONAL PINS OMITTED FOR CLARITY
R2
2k2
C9
330pF
1
μ
s
ONE SHOT
DELAY
R1
2k2
Figure 13. DAC Sample-and-Hold Circuit
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相關代理商/技術參數 |
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|---|---|
| AD7869JN | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, 14-Bit Analog I/O System |
| AD7869JNZ | 功能描述:IC I/O PORT 14BIT ANLG 24DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產品:NXP - I2C Interface 標準包裝:1 系列:- 應用:2 通道 I²C 多路復用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| AD7869JQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD7869JR | 制造商:Analog Devices 功能描述:Data Acquisition System Single ADC Single DAC 14-Bit 28-Pin SOIC W 制造商:Analog Devices 功能描述:DATA ACQ SYS SGL ADC SGL DAC 14BIT 28SOIC W - Rail/Tube |
| AD7869JRZ | 功能描述:IC I/O PORT 14BIT ANLG 28SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產品:NXP - I2C Interface 標準包裝:1 系列:- 應用:2 通道 I²C 多路復用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
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