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參數(shù)資料
| 型號： | ADS8482IRGZT |
| 英文描述： | 18-BIT, 1-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| 中文描述： | 18位，1 MSPS的，偽雙極，全差分輸入，微采樣模擬到數(shù)字轉(zhuǎn)換并行接口，參考 |
| 文件頁數(shù)： | 21/31頁 |
| 文件大?。?/td> | 647K |
| 代理商： | ADS8482IRGZT |
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ANALOG INPUT
When the converter enters the hold mode, the voltage difference between the +IN and –IN inputs is captured on
the internal capacitor array. Both +IN and –IN input has a range of –0.2 V to Vref + 0.2 V. The input span [+IN –
(–IN)] is limited to –V
ref
to V
ref
.
The input current on the analog inputs depends upon a number of factors: sample rate, input voltage, and
source impedance. Essentially, the current into the ADS8482 charges the internal capacitor array during the
sample period. After this capacitance has been fully charged, there is no further input current. The source of the
analog input must be able to charge the input capacitance (65 pF) to an 18-bit settling level within the acquisition
time (320 ns) of the device. When the converter goes into the hold mode, the input impedance is greater than 1
G
.
Care must be taken regarding the absolute analog input voltage. To maintain the linearity of the converter, the
+IN and –IN inputs and the span [+IN – (–IN)] must be within the limits specified. Outside of these ranges, the
converter's linearity may not meet specifications. To minimize noise, low bandwidth input signals with low-pass
filters are used.
ADS8482
SLAS386A–JULY 2005–REVISED JUNE 2006
PRINCIPLES OF OPERATION (continued)
Care must be taken to ensure that the output impedance of the sources driving the +IN and –IN inputs are
matched. If this is not observed, the two inputs could have different setting times. This may result in offset error,
gain error, and linearity error which varies with temperature and input voltage.
The analog input to the converter needs to be driven with a low noise, high-speed op-amp like the THS4031. An
RC filter is recommended at the input pins to low-pass filter the noise from the source. The input to the converter
is a uni-polar input voltage in the range 0 to V
ref
. The THS4031 can be used in the source follower configuration
to drive the converter.
21
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8482IRGZTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1MSPS Parall ADC w/Ref 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 |
| ADS8484 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:18-BIT, 1.25-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE,REFERENCE |
| ADS8484EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS8484 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS8484IBRGZR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18B 1.25MSPS Para ADC 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 |
| ADS8484IBRGZRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18B 1.25MSPS ADC 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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