參數(shù)資料
型號(hào)： ADS7891
英文描述： CMOS Hex Schmitt Triggers 14-SO -55 to 125
中文描述： 3 MSPS的14位低功耗的SAR模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 8/26頁(yè)
文件大?。?/td> 329K
代理商： ADS7891
SLAS410 DECEMBER 2003
www.ti.com
8
DESCRIPTION AND TIMING DIAGRAMS
SAMPLING AND CONVERSION START
There are three ways to start sampling. The rising edge of
CONVST starts sampling
with CS and BUSY being low
(see Figure 1) or it can be started with the falling edge of CS when CONVST
is high and BUSY is low (see
Figure 2). Sampling can also be started with an internal conversion end (before BUSY falling edge) with CS
being low and CONVST high before an internal conversion end (see Figure 3). Also refer to the section DEVICE
OPERATION AND DATA READ IN BACK-TO-BACK CONVERSION for more details.
A conversion can be started two ways (a conversion start is the end of sampling). Either with the falling edge
of CONVST when CS is low (see Figure 1) or the falling edge of CS when CONVST is low (see Figure 2). A
clean and low jitter falling edge of these respective signals triggers a conversion start and is important to the
performance of the converter. The BUSY pin is brought high immediately following the CONVST falling edge.
BUSY stays high throughout the conversion process and returns low when the conversion has ended.
th2
th3
td1
td2
t(acq)
CS
CONVST
BUSY
Figure 1. Sampling and Conversion Start Control With CONVST Pin
td3
t(acq)
tw3
tw3
td4
tw1
CS
CONVST
BUSY
Figure 2. Sampling and Conversion Start Control With CS Pin
t(acq)
tw4
td2
CS
CONVST
BUSY
th1
tw5
Figure 3. Sampling Start With CS Low and CONVST High (Back-to-Back)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7891EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 ADS7891 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
ADS7891IPFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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
ADS7891IPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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
ADS7891IPFBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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
ADS7891IPFBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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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