參數(shù)資料
型號： ADS8422IBPFBR
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48
封裝： 9 X 9 MM, GREEN, PLASTIC, TQFP-48
文件頁數(shù)： 7/28頁
文件大?。?/td> 1310K
代理商： ADS8422IBPFBR
www.ti.com
PRINCIPLES OF OPERATION
REFERENCE
ANALOG INPUT
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.
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-
F decoupling
capacitor and a 1-
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.
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 VREF. However
since the two inputs are 180
° out of phase, the peak-to-peak amplitude of the difference voltage [+IN – (–IN)] is
equal to 2VREF. The common-mode input range is from VREF/2 – 0.2 V to VREF/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.
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
相關(guān)PDF資料
PDF描述
ADSP-2189NBSTZ-320 16-Bit, 80MIPS, 1.8V, 2 Serial Ports, Host Port, 192KB RAM; Package: 100 ld LQFP; No of Pins: 100; Temperature Range: Ind
ADSP-2189NKCAZ-320 16-Bit, 80MIPS, 1.8V, 2 Serial Ports, Host Port, 192KB RAM; Package: CHIP SCALE BGA; No of Pins: 144; Temperature Range: Comm.
ADSP-2189NKSTZ-320 16-Bit, 80MIPS, 1.8V, 2 Serial Ports, Host Port, 192KB RAM; Package: 100 ld LQFP; No of Pins: 100; Temperature Range: Comm.
ADSP-2191MBCAZ-140 16-bit Fixed-Point DSP, 160 MIPS, 160K bytes RAM; Package: CHIP SCALE BGA; No of Pins: 144; Temperature Range: Ind
ADSP-2191MBSTZ-140 16-bit Fixed-Point DSP, 160 MIPS, 160K bytes RAM; Package: 144 ld LQFP (20x20mm); No of Pins: 144; Temperature Range: Ind
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS8422IBPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit MSPS Parallel 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
ADS8422IBPFBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit MSPS Parallel 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
ADS8422IBPFBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit MSPS Parallel 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
ADS8422IPFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 4MSPS 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
ADS8422IPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 4MSPS 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
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*