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ADS1255 與 ADS1256 噪聲極低的 24 位模數(shù) (A/D) 轉(zhuǎn)換器。這些器件能夠?yàn)橐髧?yán)格的應(yīng)用提供完整的高精度測(cè)量解決方案。?

該轉(zhuǎn)換器由一個(gè) 4 階 Δ-Σ 調(diào)制器與一個(gè)可編程" title="可編程">可編程數(shù)字濾波器組成。靈活的輸入多路復(fù)用器能夠處理差動(dòng)或單端信號(hào)，其電路能驗(yàn)證與輸入相連的外部傳感器的完整性?？蛇x輸入緩沖器顯著提高了輸入阻抗，而低噪聲可編程增益放大器 (PGA) 可提供二進(jìn)制步長(zhǎng)為 1 至 64 的增益。通過(guò)可編程濾波器，用戶可以在高達(dá) 23 位的無(wú)噪聲分辨率與高達(dá) 30k 次采樣/秒 (SPS) 的數(shù)據(jù)速率之間進(jìn)行優(yōu)化。這些轉(zhuǎn)換器不僅能夠提供快速通道循環(huán)以測(cè)量多路復(fù)用的輸入，而且還能執(zhí)行只需一個(gè)周期即可建立的一次轉(zhuǎn)換。?

通過(guò)符合 SPI 標(biāo)準(zhǔn)的串行接口可以處理通信問(wèn)題，該接口使用的是雙線連接。對(duì)于所有 PGA 設(shè)置，板上校準(zhǔn)均同時(shí)支持失調(diào)與增益誤差的自校正與系統(tǒng)校正。另外還提供了可通用的雙向數(shù)字 I/O 與可編程時(shí)鐘輸出驅(qū)動(dòng)器。ADS1255 采用 SSOP-20 封裝，而 ADS1256 采用 SSOP-28 封裝。?

ADS1258 – 24 位，16通道多路復(fù)用 高速Δ-Σ ADC?

ADS1258 是一種 16 通道（多路復(fù)用的）低噪聲、24 位 Δ-Σ ( ) 模數(shù)轉(zhuǎn)換器 (ADC)，能夠以每通道 1.8k 至 23.7k 次采樣∕秒 (SPS) 的通道掃描速率提供單周期建立的數(shù)據(jù)。在 5V 參考電壓下工作時(shí)，其靈活的輸入多路復(fù)用器可接受 8 個(gè)差動(dòng)或 16 個(gè)單端輸入與 5V 滿量程差動(dòng)范圍或 ±2.5V 真正雙極范圍的組合。在 4 階 Δ-Σ 調(diào)制器的后面有一個(gè)針對(duì)低噪聲性能進(jìn)行了專門優(yōu)化的 5 階正弦數(shù)字濾波器。?

多路復(fù)用器的差動(dòng)輸出具有可訪問(wèn)特性，從而可以在 ADC 輸入之前進(jìn)行信號(hào)調(diào)節(jié)。內(nèi)部系統(tǒng)監(jiān)控器寄存器可提供電源電壓、溫度、參考電壓、增益與失調(diào)數(shù)據(jù)。?

板上 PLL 可使用 32.768kHz 晶體生成系統(tǒng)時(shí)鐘，也可以被外部時(shí)鐘源覆蓋。緩沖的系統(tǒng)時(shí)鐘輸出 (15.7MHz) 可以驅(qū)動(dòng)微控制器或其它轉(zhuǎn)換器。?

串行數(shù)字通信可通過(guò)符合 SPI? 標(biāo)準(zhǔn)的接口進(jìn)行處理。簡(jiǎn)單的命令字結(jié)構(gòu)可控制通道配置、數(shù)據(jù)速率、數(shù)字 I/O、監(jiān)控器功能等。?

ADS1271 – 24 位 105kSPS 工業(yè) Δ-Σ ADC?

ADS1271 是一種數(shù)據(jù)速率高達(dá) 105kSPS 的 24 位 Δ-Σ 模數(shù)轉(zhuǎn)換器 (ADC)。該器件以獨(dú)特的方式實(shí)現(xiàn)了出色 DC 準(zhǔn)確度與優(yōu)異 AC 性能的完美結(jié)合。這款高階、限幅自穩(wěn)調(diào)制器以較低的帶內(nèi)噪聲實(shí)現(xiàn)了非常低的漂移。板上抽取濾波器可抑制調(diào)制器與信號(hào)帶外噪聲。ADS1271 能夠以低于 0.005dB 的紋波提供尼奎斯特速率高達(dá) 90% 的可用信號(hào)帶寬。?

過(guò)去，可提供出色漂移性能的工業(yè) Δ-Σ ADC 使用的是帶通下垂較大的數(shù)字濾波器。因此，這些器件具有有限的信號(hào)帶寬，主要適用于 DC 測(cè)量應(yīng)用。音頻應(yīng)用中的高精度 ADC 可提供較大的可用帶寬，但失調(diào)與漂移規(guī)范比其行業(yè)內(nèi)的對(duì)應(yīng)產(chǎn)品薄弱地多。ADS1271 將這些轉(zhuǎn)換器進(jìn)行了完美組合，不僅能夠進(jìn)行高精度工業(yè)測(cè)量，而且還能在擴(kuò)大的工業(yè)溫度范圍內(nèi)確保出色的 DC 與 AC 規(guī)范。?

ADS8330 - 具有 2 到 1 MUX 和 Ref 引腳的 2.7V~5.5V 16 位 750KSPS 串行 ADC?

ADS8329 是一種具有單極輸入的低功耗、16 位、1 MSPS 模數(shù)轉(zhuǎn)換器。該器件包含帶有內(nèi)置采樣保持的、基于電容器的 16 位 SAR A/D 轉(zhuǎn)換器。?

ADS8330 基于同一內(nèi)核，包含帶有可編程 TAG 位輸出選項(xiàng)的 2:1 輸入 MUX。ADS8329 與 ADS8330 均可提供高速、寬泛電壓串行接口，在使用多個(gè)轉(zhuǎn)換器時(shí)能夠在鏈模式下工作。?