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AD421

Loop-Powered 4 mA to 20 mA DAC

GENERALDESCRIPTION TheAD421isacomplete,loop-powered,digitalto4mAto20mAconverter,designedtomeettheneedsofsmarttransmittermanufacturersintheIndustrialControlindustry.Itprovidesahighprecision,fullyintegrated,lowcostsolutioninacompact16-leadpackage.TheAD42

AD421

環(huán)路供電4-20 mA DAC; ? 電流輸出：4 mA至20 mA\n\n? 兼容HART\n\n? 16位分辨率和單調(diào)性\n\n? 積分非線性誤差：±0.01%\n\n? 調(diào)節(jié)器輸出：5 V或3 V\n\n? 2.5 V和1.25 V精密基準(zhǔn)電壓源 \n\n? 靜態(tài)電流：750 μA（最大值）\n\n? 可編程報(bào)警電流能力\n\n? 靈活的高速串行接口\n\n? 16引腳SOIC和PDIP封裝;

AD421是一款完整的環(huán)路供電、數(shù)字4-20 mA轉(zhuǎn)換器，專為滿足工業(yè)控制領(lǐng)域智能發(fā)射器制造商的需求而設(shè)計(jì)。它提供一種高精度、全集成、低成本解決方案，采用緊湊型16引腳封裝。AD421特別適合擴(kuò)展4-20 mA智能發(fā)射器的分辨率，而且成本極低。 \n\nAD421內(nèi)置一個(gè)可選調(diào)節(jié)器，用于為自身及發(fā)射器中的其它器件供電。此調(diào)節(jié)器可提供+5 V、+3.3 V或+3 V調(diào)節(jié)輸出電壓。該器件還內(nèi)置+1.25 V和+2.5 V精密基準(zhǔn)電壓源。因此，AD421不需要分立式調(diào)節(jié)器和基準(zhǔn)電壓源。外部元件只需若干無源元件和一個(gè)調(diào)整管，用于擴(kuò)充大環(huán)路電壓范圍。 \n\nAD421可以結(jié)合標(biāo)準(zhǔn)HART FSK協(xié)議通信電路使用，而且額定性能不會(huì)受到影響。高速串行接口能夠以10 Mbps速率工作，并允許通過一個(gè)標(biāo)準(zhǔn)三線式串行接口與常用的微處理器和微控制器簡單相連。 \n\n這款DAC采用Σ-Δ架構(gòu)，可保證16位單調(diào)性，且積分非線性為±0.01%。該器件提供4 mA零電平輸出電流（失調(diào)誤差為±0.1%），以及20 mA滿量程輸出電流（增益誤差為±0.2%）。 \n\nAD421提供以下兩種封裝：16引腳、0.3英寸寬、塑料DIP封裝和16引腳、0.3英寸寬、SOIC封裝。額定溫度范圍為-40°C至+85°C的工業(yè)溫度范圍。

AD421

Loop-Powered 4 mA to 20 mA DAC

AD421

Loop-Powered 4 mA to 20 mA DAC

AD4212

同步整流降壓DC-DC轉(zhuǎn)換器;

AD4212器件是高效率、同步降壓DC/DC穩(wěn)壓器。由于輸入范圍廣，它們 適用于各種應(yīng)用，例如非穩(wěn)壓電源的功率調(diào)節(jié)。他們的特點(diǎn)是 低rd son（250mω/150mω典型值）內(nèi)部開關(guān)可實(shí)現(xiàn)最高效率（92%典型值）。支持PSM模式 （非A選項(xiàng)）和強(qiáng)制PWM模式（A選項(xiàng)），工作頻率固定在800kHz，允許使用 小外部元件，同時(shí)仍然能夠具有低輸出電壓紋波。利用OVP函數(shù)，IC可以 高達(dá)45V的關(guān)斷輸入電壓。AD4212支持1.2A連續(xù)輸出電流，它們都具有0.8V 額定反饋電壓。?\n? 其它特性包括:熱關(guān)斷、VIN欠壓閉鎖和柵極驅(qū)動(dòng)欠壓閉鎖。這 AD4212采用SOT23-6封裝。

AD421BN

Loop-Powered 4 mA to 20 mA DAC

GENERALDESCRIPTION TheAD421isacomplete,loop-powered,digitalto4mAto20mAconverter,designedtomeettheneedsofsmarttransmittermanufacturersintheIndustrialControlindustry.Itprovidesahighprecision,fullyintegrated,lowcostsolutioninacompact16-leadpackage.TheAD42

AD421BN

Loop-Powered 4 mA to 20 mA DAC

GENERALDESCRIPTION TheAD421isacomplete,loop-powered,digitalto4mAto20mAconverter,designedtomeettheneedsofsmarttransmittermanufacturersintheIndustrialControlindustry.Itprovidesahighprecision,fullyintegrated,lowcostsolutioninacompact16-leadpackage.TheAD42

AD421BNZ

Loop-Powered 4 mA to 20 mA DAC

GENERALDESCRIPTION TheAD421isacomplete,loop-powered,digitalto4mAto20mAconverter,designedtomeettheneedsofsmarttransmittermanufacturersintheIndustrialControlindustry.Itprovidesahighprecision,fullyintegrated,lowcostsolutioninacompact16-leadpackage.TheAD42

AD421BR

Loop-Powered 4 mA to 20 mA DAC

GENERALDESCRIPTION TheAD421isacomplete,loop-powered,digitalto4mAto20mAconverter,designedtomeettheneedsofsmarttransmittermanufacturersintheIndustrialControlindustry.Itprovidesahighprecision,fullyintegrated,lowcostsolutioninacompact16-leadpackage.TheAD42

AD421BR

Loop-Powered 4 mA to 20 mA DAC

GENERALDESCRIPTION TheAD421isacomplete,loop-powered,digitalto4mAto20mAconverter,designedtomeettheneedsofsmarttransmittermanufacturersintheIndustrialControlindustry.Itprovidesahighprecision,fullyintegrated,lowcostsolutioninacompact16-leadpackage.TheAD42