TIADS8201低功耗单片数据采集方案

TIADS8201低功耗单片数据采集方案TI公司的ADS8201是低功耗单片数据采集系统,包括12位采用电容的SAR模数转换器(ADC),高性能连续时间可编增益放大器(PGA)以及全自动扫描8:1复接器,模拟电压2.2V到5.5V,高达100kSPS吞吐量速率,SCLK高达25MHz(VD=5V),主要用在手提通信,传感器接口,手提医疗仪表,数据采集系统和GPS芯片组.本文介绍ADS8201主要特性,功能方框图以及精密定位应用电路图和桥式传感器应用电路图.TheADS8201isalow-power,completeon-chipdataacquisitionsystemoptimizedforportableapplicationsthatrequiredirectconnections,widedynamicrange,andautomaticoperationwithverylowpowerconsumption.Thedeviceincludesa12-bit,capacitor-based,successiveapproximationregister(SAR)analog-to-digitalconverter(ADC);ahigh-performance,continuous-timeprogrammablegainamplifier(PGA);andafullyautomaticscan,8-to-1multiplexer(mux)withbreakouttoallowforsystemdesignflexibility.Manyotherfeaturesareincludedtofurtheroptimizesystemoperation.Conversionresultsmaybesavedinanonboardfirst-in/first-out(FIFO)bufferandreadoutatalatertime.Eachchannelhasagainsettingthatcanbeloadedautomaticallywhenitisselected.ADS8201主要特性:•Multi-ChipReadyandFullyEnabled:234•Low-Power,FlexibleSupplyRange:–2.2Vto5.5VAnalogSupply–1.32mW(100kHz,+VA=2.2V,+VD=2.2V)–4.5mW(100kHz,+VA=5V,+VD=5V)•Upto100kSPSThroughputRate•ExcellentDCPerformance:•TransducerInterfaces–±0.5LSBtyp,±1.5LSBmaxINL•PortableMedicalInstruments–±0.5LSBtyp,±1.0LSBmaxDNL•DataAcquisitionSystems–±6LSBOffsetErrorat+VA=5V•GPSChipsets–±0.1%FSGainErrorat+VA=5VSPACE•FlexibleAnalogInputs:–TrueDifferentialInput–Differential/UnipolarInputRange(0toVREF)–TAGBitOutput–ProgrammableAveragingFunction–Onboard,EightSingle-Ended/FourDifferentialChannelMux:–HighInputImpedance–High-PerformancePGA(Gain=1/2/4/8)–PGABreakout–Auto/ManualChannelSelectwithGain.–Auto/ManualTrigger–MixedTypePartialScan•Built-inHardwareFeatures:–On-chipConversionClock(CCLK)–Hardware/SoftwareReset–ProgrammableStatus/PolarityforBUSY/INT•FlexibleI/O:–SPI-/DSP™-CompatibleSerialInterface–SeparateI/OSupply(2.2Vto5.5V)–Onboard8×1FIFOBuffer–SCLKupto25MHz(VD=5V)•Multi-ChipReadyandFullyEnabled:–GlobalCONVST(IndependentofCS)•Power-DownMode•24-Pin4×4QFNPackageADS8201应用:•PortableCommunications•TransducerInterfaces•PortableMedicalInstruments•DataAcquisitionSystems•GPSChipsets图1.ADS8201功能方框图图2.ADS8201精密定位应用电路图AO-Electronics傲壹电子官网：中文网：图3.ADS8201桥式传感器应用电路图