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參數資料
| 型號： | AD7840SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Complete 14-Bit DAC |
| 中文描述： | SERIAL, PARALLEL, WORD INPUT LOADING, 2 us SETTLING TIME, 14-BIT DAC, CDIP24 |
| 封裝： | HERMETIC SEALED, CERDIP-24 |
| 文件頁數： | 9/16頁 |
| 文件大小： | 337K |
| 代理商： | AD7840SQ |
AD7840
REV. B
–9–
Figure 11. AD7840 Dynamic Performance Test Circuit
T he digitizer sampling is synchronized with the AD7840 update
rate to ease FFT calculations. T he digitizer samples the
AD7840 after the output has settled to its new value. T herefore,
if the digitizer was to sample the output directly it would effec-
tively be sampling a dc value each time. As a result, the dynamic
performance of the AD7840 would not be measured correctly.
Using the digitizer directly on the AD7840 output would give
better results than the actual performance of the AD7840. Us-
ing a filter between the DAC and the digitizer means that the
digitizer samples a continuously moving signal and the true dy-
namic performance of the AD7840 is measured.
Some applications will require improved performance versus fre-
quency from the AD7840. In these applications, a simple
sample-and-hold circuit such as that outlined in Figure 12 will
extend the very good performance of the AD7840 to 20 kHz.
Figure 12. Sample-and-Hold Circuit
Other applications will already have an inherent sample-and-
hold function following the AD7840. An example of this type of
application is driving a switched-capacitor filter where the up-
dating of the DAC is synchronized with the switched-capacitor
filter. T his inherent sample-and-hold function also extends the
frequency range performance of the AD7840.
Performance versus Frequency
T he typical performance plots of Figures 13 and 14 show the
AD7840’s performance over a wide range of input frequencies
at an update rate of 100 kHz. T he plot of Figure 13 is without a
sample-and-hold on the AD7840 output while the plot of Figure
14 is generated with the sample-and-hold circuit of Figure 12 on
the output.
Figure 13. Performance vs. Frequency
(No Sample-and-Hold)
Figure 14. Performance vs. Frequency
(with Sample-and-Hold)
相關PDF資料 |
PDF描述 |
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| AD7840 | LC2MOS Complete 14-Bit DAC |
| AD7840BQ | LC2MOS Complete 14-Bit DAC |
| AD7841 | Octal 14-Bit, Parallel Input, Voltage-Output DAC |
| AD7841AS | Octal 14-Bit, Parallel Input, Voltage-Output DAC |
| AD7841BS | Octal 14-Bit, Parallel Input, Voltage-Output DAC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7840SQ/883B | 功能描述:數模轉換器- DAC 14-BTI DAC IC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| AD7841 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Octal 14-Bit, Parallel Input, Voltage-Output DAC |
| AD7841AS | 制造商:Analog Devices 功能描述:DAC 8-CH R-2R 14-bit 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:OCTAL 14-BIT HIGH VOLTAGE DAC I.C. - Bulk 制造商:Analog Devices 功能描述:Digital/Analog Converter IC Interface Ty |
| AD7841AS-REEL | 制造商:Analog Devices 功能描述:DAC 8-CH R-2R 14-bit 44-Pin MQFP T/R |
| AD7841ASZ | 功能描述:IC DAC 14BIT OCTAL V-OUT 44MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:1 系列:- 設置時間:4.5µs 位數:12 數據接口:串行，SPI? 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
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