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參數資料
| 型號： | ADS8507I |
| 英文描述： | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| 中文描述： | 16位40 kSPS的低功耗采樣模擬到數字轉換的內部基準，并行/串行接口 |
| 文件頁數： | 27/32頁 |
| 文件大?。?/td> | 738K |
| 代理商： | ADS8507I |
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APPLICATION INFORMATION
TRANSITION NOISE
Apply a DC input to the ADS8507 and initiate 1000 conversions. The digital output of the converter varies in
output codes due to the internal noise of the ADS8507. This is true for all 16-bit SAR converters. The transition
noise specification found in the electrical characteristics section is a statistical figure which represents the one
sigma limit or rms value of these output codes.
2
7FFD
H
7FFE
H
7FFF
H
8000
H
8001
H
8002
H
8003
H
190
3142
9732
3075
242
1
AVERAGING
The noise of the converter can be compensated by averaging the digital codes. By averaging conversion results,
transition noise is reduced by a factor of 1/
√
Hz where n is the number of averages. For example, averaging four
conversion results reduces the TN by to 0.4 LSBs. Averaging should only be used for input signals with
frequencies near DC.
QSPI INTERFACE
Figure 49
shows a simple interface between the ADS8507 and any QSPI equipped microcontroller. This
interface assumes that the convert pulse does not originate from the microcontroller and that the ADS8507 is the
only serial peripheral.
ADS8507
SLAS381–DECEMBER 2006
Using a histogram to plot the output codes, the distribution should appear bell-shaped with the peak of the bell
curve representing the nominal output code for the input voltage value. The ±1
σ
, ±2
σ
, and ±3
σ
distributions
represent 68.3%, 95.5%, and 99.7% of all codes. Multiplying TN by 6 yields the ±3
σ
distribution or 99.7% of all
codes. Statistically, up to 3 codes could fall outside the 5 code distribution when executing 1000 conversions.
The ADS8507 has a TN of 0.8 LSBs which yields 5 output codes for a ±3
σ
distribution.
Figure 48
shows 16384
conversion histogram results.
Figure 48. Histogram of 16384 Conversions with V
IN
= 0 V in
±
10 V Bipolar Range
For AC signals, a digital filter can be used to low-pass filter and decimate the output codes. This works in a
similar manner to averaging: for every decimation by 2, the signal-to-noise ratio improves 3 dB.
27
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相關PDF資料 |
PDF描述 |
|---|---|
| ADS8507IB | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDW | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDWG4 | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDWR | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDWRG4 | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADS8507IB | 制造商:BB 制造商全稱:BB 功能描述:16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDW | 功能描述:模數轉換器 - ADC 16-Bit 40KSPS ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS8507IBDWG4 | 功能描述:模數轉換器 - ADC 16-Bit 40KSPS ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS8507IBDWR | 功能描述:模數轉換器 - ADC 16-Bit 40KSPS ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS8507IBDWRG4 | 功能描述:模數轉換器 - ADC 16-Bit 40KSPS ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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