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參數(shù)資料
| 型號： | ADS8422IBPFBR |
| 英文描述： | 16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| 中文描述： | 16位4 MSPS的，偽雙極，全差分輸入，微采樣模擬到數(shù)字轉換并行接口，參考 |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 816K |
| 代理商： | ADS8422IBPFBR |
www.ti.com
PRINCIPLES OF OPERATION
REFERENCE
The ADS8422 has a built-in 4.096-V reference but can operate with an external 4.096-V reference. When
internal reference is used, pin 2 (REFOUT) should be connected to pin 1 (REFIN) with a 0.1-
μ
F decoupling
capacitor and a 1-
μ
F storage capacitor between pin 2 (REFOUT) and pins 47 and 48 (REFM). The internal
reference of the converter is double buffered. If an external reference is used, the second buffer provides
isolation between the external reference and the CDAC. This buffer is also used to recharge all of the capacitors
of the CDAC during conversion. Pin 2 (REFOUT) can be left unconnected (floating) if an external reference is
used.
ANALOG INPUT
The ADS8422 has a pseudo-bipolar, fully differential input. When the input is differential, the amplitude of the
input equals the difference between +IN and –IN. The peak-to-peak amplitude of each input is V
. However
since the two inputs are 180
°
out of phase, the peak-to-peak amplitude of the difference voltage [+IN – (–IN)] is
equal to 2V
REF
. The common-mode input range is from V
REF
/2 – 0.2 V to V
REF
/2 + 0.2 V.
In order to avoid additional external circuitry on the board, the ADS8422 outputs reference input on REFIN
divided by 2 on pin 3 (COMMOUT). This voltage can be used to set the common-mode of the output from the
input driver.
ADS8422
SLAS512B–JUNE 2006–REVISED DECEMBER 2006
The ADS8422 is a member of a family of high-speed multi-bit successive approximation register (SAR)
analog-to-digital converters (ADC). The architecture is based on charge redistribution, which inherently includes
a sample/hold function. See
Figure 34
for the application circuit for the ADS8422.
The conversion clock is generated internally. The conversion time is a maximum of 180 ns that is capable of
sustaining a 4-MHz throughput.
The analog input is provided to two input pins: +IN and -IN. When a conversion is initiated, the differential input
on these pins is sampled on the internal capacitor array. While a conversion is in progress, both inputs are
disconnected from any internal function.
Figure 29
,
Figure 30
,
Figure 31
,
Figure 32
, and
Figure 33
show the recommended circuits to interface an analog
input signal to the ADS8422.
15
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相關PDF資料 |
PDF描述 |
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| ADS8422IBPFBT | 16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| ADS8422IPFBR | 16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| ADS8422IPFBT | 16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8422IBPFBRG4 | 功能描述:模數(shù)轉換器 - ADC 16 Bit MSPS Parallel ADC w/Ref RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS8422IBPFBT | 功能描述:模數(shù)轉換器 - ADC 16 Bit MSPS Parallel ADC w/Ref RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS8422IBPFBTG4 | 功能描述:模數(shù)轉換器 - ADC 16 Bit MSPS Parallel ADC w/Ref RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS8422IPFBR | 功能描述:模數(shù)轉換器 - ADC 16-Bit 4MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS8422IPFBRG4 | 功能描述:模數(shù)轉換器 - ADC 16-Bit 4MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)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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