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14-Bit, 2-MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power ADCs PDF

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ADS7945 ADS7946 www.ti.com.cn ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 14-位, 2 MSPS, 双通道, 差分/单端, 超低功耗模数转换器 查询样品:ADS7945,ADS7946 特性 说明 1 • 取样率:2MSPS ADS7945/6是14-为,2MSPS模数转换器(ADCs), 它 23 • 14-位, 与8/10/12-位ADS7947/8/9系列产品 们分别具有差分和单端输入。此设备运行在2MSPS (ADS7946)引脚兼容 具有一个标准16时钟数据帧的采样速率。此设备特有 • 突出的性能: 突出的dc精度和出色的动态性能;ADS7946与 – SNR:84dB (ADS7945) 8/10/12-位ADS7947/8/9 设备引脚兼容。此设备包含 – 无丢码 一个2通道输入复用器和一个低功率逐次逼近寄存 – INL:1.5LSB(最大)(ADS7945) 器(SAR),此寄存器具有一个固有的取样保持输入 • 低功耗: 级。 – 在2MSPS运行模式下,11.6mW ADS7945/6支持较宽的模拟供电范围,允许的全尺寸 – 低速状态下自动动率降低: 输入范围已拓展到±5V 差分或者5V单端范围。一 – 在500kSPS模式下7.2mW 个简单的SPI™, 具有数字供电,能在低至1.65V的电 – 在100kSPS模式下1.4mW 压下运行,能很容易的与多种数字控制器建立端口连 – 在20kSPS 模式下0.3mW 接。当运行在较低速度时,自动掉电可被启用以大幅 • 宽电源范围: 减少功率消耗。 – 模拟:2.7V至5.25V 封装方式为微小3mm×3mm QFN,ADS7945/6 完全 – 数字:1.65V 至AVDD 额定工作温度范围从–40°C 至+125°C并适合多种数 • 简单串口(SPI) 据采集应用,在这里,高性能,低功耗和小封装尺寸是 • 完全指定温度范围从–40°C 到+125°C 关键。 • 微笑器件封装:3mm× 3mmQFN 应用范围 • 光纤网络 • 医疗仪表 • 电池供电设备 • 数据采集系统 AVDD REF REFGND DVDD AVDD REF REFGND DVDD ADS7945 ADS7946 PDEN PDEN AIN0P AIN0 AIN0N CS AIN0GND CS SAR SAR MUX S/H SPI SCLK MUX S/H SPI SCLK ADC ADC AIN1N SDO AIN1GND SDO AIN1P AIN1 CH SEL CH SEL GND GND 1 Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. SPIisatrademarkofMotorola. 2 Allothertrademarksarethepropertyoftheirrespectiveowners. 3 PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2011,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not EnglishDataSheet:SBAS539B necessarilyincludetestingofallparameters. ADS7945 ADS7946 ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 www.ti.com.cn Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates. FAMILY ANDORDERINGINFORMATION(1) PRODUCT RESOLUTION(Bits) INPUT ADS7945 14 Unipolar,differential ADS7946 14 Unipolar,single-ended ADS7947 12 Unipolar,single-ended ADS7948 10 Unipolar,single-ended ADS7949 8 Unipolar,single-ended (1) Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orvisitthe deviceproductfolderatwww.ti.com. ABSOLUTE MAXIMUM RATINGS(1) Overoperatingfree-airtemperaturerange,unlessotherwisenoted. VALUE UNIT AINxPtoGNDorAINxNtoGND(ADS7945) –0.3toAVDD+0.3 V AINxtoGND(ADS7946) –0.3toAVDD+0.3 V AINxGNDtoGND(ADS7946) –0.3to+0.3 V AVDDtoGNDorDVDDtoGND –0.3to7 V DigitalinputvoltagetoGND –0.3toDVDD+0.3 V DigitaloutputtoGND –0.3toDVDD+0.3 V Operatingtemperaturerange –40to+125 °C Storagetemperaturerange –65to+150 °C Humanbodymodel(HBM) 2000 V ESDratings Chargeddevicemodel(CDM) 500 V Machinemodel(MM) 200 V (1) Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderelectricalcharacteristicsisnot implied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability. 2 Copyright©2011,TexasInstrumentsIncorporated ADS7945 ADS7946 www.ti.com.cn ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 ELECTRICAL CHARACTERISTICS: ADS7945 (Differential) Minimum/maximumspecificationsatT =–40°Cto+125°C,AVDD=2.7Vto5.25V,DVDD=1.65VtoAVDD,input A common-mode=V /2±0.2,andf =2MSPS,unlessotherwisenoted. REF SAMPLE TypicalspecificationsatT =+25°C,AVDD=5V,DVDD=1.8V,inputcommon-mode=V /2±0.2,andf =2MSPS. A REF SAMPLE PARAMETER TESTCONDITIONS MIN TYP MAX UNITS ANALOGINPUT Full-scaleinputspan(1) AINxP–AINxN –V V V REF REF AIN0P,AIN1P –0.2 AVDD+0.2 V Absoluteinputrange AIN0N,AIN1N –0.2 AVDD+0.2 V Inputcommon-moderange(2) (AINxP+AINxN)/2 V /2±0.2 V REF Inputcapacitance(3) 32 pF Inputleakagecurrent At+125°C 1.5 nA SYSTEMPERFORMANCE Resolution 14 Bits Nomissingcodes 14 Bits Integrallinearity –1.5 ±0.8 1.5 LSB(4) Differentiallinearity –1 ±0.8 1.5 LSB Offseterror(5) –4 ±1.5 4 LSB Gainerror –4 ±1.5 4 LSB Transitionnoise 25 µV RMS Power-supplyrejection With500HzsinewaveonAVDD 60 dB SAMPLINGDYNAMICS Conversiontime 16 SCLK Acquisitiontime 80 ns Maximumsamplerate(throughputrate) 40MHzSCLKwitha16-clockframe 2 MSPS Aperturedelay(6) 10 ns Aperturejitter(6) 10 ps Stepresponse(6)(3) 80 ns DYNAMICCHARACTERISTICS Totalharmonicdistortion(THD)(7) 20kHz,V =4.0V –92 dB REF 20kHz,V =4.0V 82 84 dB REF Signal-to-noiseratio(SNR) 100kHz,V =4.0V 83 dB REF Signal-to-noiseanddistorionratio(SINAD) 20kHz,V =4.0V 83.5 dB REF Spurious-freedynamicrange(SFDR) 20kHz,V =4.0V 94 dB REF Full-powerbandwidth(8) At–3dB 15 MHz (1) Idealinputspan;doesnotincludegainoroffseterror. (2) RefertotheInputCommon-ModeRangesectioninApplicationInformation. (3) RefertoFigure76forsamplingcircuitdetails. (4) LSBmeansleastsignificantbit. (5) Measuredrelativetoanidealfull-scaleinput. (6) Ensuredbysimulation. (7) Calculatedonthefirstnineharmonicsoftheinputfrequency. (8) Indicatessignalbandwidthforundersamplingapplications. Copyright©2011,TexasInstrumentsIncorporated 3 ADS7945 ADS7946 ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 www.ti.com.cn ELECTRICAL CHARACTERISTICS: ADS7945 (Differential) (continued) Minimum/maximumspecificationsatT =–40°Cto+125°C,AVDD=2.7Vto5.25V,DVDD=1.65VtoAVDD,input A common-mode=V /2±0.2,andf =2MSPS,unlessotherwisenoted. REF SAMPLE TypicalspecificationsatT =+25°C,AVDD=5V,DVDD=1.8V,inputcommon-mode=V /2±0.2,andf =2MSPS. A REF SAMPLE PARAMETER TESTCONDITIONS MIN TYP MAX UNITS DIGITALINPUT/OUTPUT Logicfamily CMOS V 0.7DVDD V IH V 0.3DVDD V IL Logiclevel V SDOload20pF 0.8DVDD V OH V SDOload20pF 0.2DVDD V OL Inputleakagecurrent I ,I 0<V <DVDD ±20 nA IH IL IN Externalreference 2.5 AVDD V POWER-SUPPLYREQUIREMENTS AVDD 2.7 3.3 5.25 V DVDD 1.65 3.3 AVDD V AVDD=3.3V,f =2MSPS 3.5 4 mA SAMPLE I DYNAMIC AVDD=5V,f =2MSPS 4 5 mA SAMPLE AVDDsupplycurrent AVDD=3.3V,SCLKoff 2.3 mA I STATIC AVDD=5V,SCLKoff 2.5 3 mA DVDDsupplycurrent(9) DVDD=3.3V,fSAMPLE=2MSPS, 750 µA SDOload20pF Power-downstate IPD-DYNAMIC SCLK=40MHz 550 µA AVDDsupplycurrent I SCLKoff 2.5 µA PD-STATIC Power-uptime Frompower-downstateusingPDENpin 1 µs TEMPERATURERANGE Specifiedperformance –40 +125 °C (9) DVDDconsumesonlydynamiccurrent.I =C ×DVDD×numberof0→1transitionsinSDO×f . DVDD LOAD SAMPLE Thisisaload-dependentcurrentandthereisnoDVDDcurrentwhentheoutputisnottoggling. 4 Copyright©2011,TexasInstrumentsIncorporated ADS7945 ADS7946 www.ti.com.cn ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 ELECTRICAL CHARACTERISTICS: ADS7946 (Single-Ended) Minimum/maximumspecificationsatT =–40°Cto+125°C,AVDD=2.7Vto5.25V,DVDD=1.65VtoAVDD, A andf =2MSPS,unlessotherwisenoted. SAMPLE TypicalspecificationsatT =+25°C,AVDD=5V,DVDD=1.8V,andf =2MSPS. A SAMPLE PARAMETER TESTCONDITIONS MIN TYP MAX UNITS ANALOGINPUT Full-scaleinputspan(1) AINx–AINxGND 0 V V REF AIN0,AIN1 –0.2 AVDD+0.2 V Absoluteinputrange AIN0GND,AIN1GND –0.2 0.2 V Inputcapacitance(2) 32 pF Inputleakagecurrent At+125°C 1.5 nA SYSTEMPERFORMANCE Resolution 14 Bits Nomissingcodes 14 Bits Integrallinearity –2.5 ±1.25 2.5 LSB(3) Differentiallinearity –1 ±0.8 2.0 LSB Offseterror(4) –4 ±1.5 4 LSB Gainerror –4 ±1.5 4 LSB Transitionnoise 25 µV RMS Power-supplyrejection With500HzsinewaveonAVDD 60 dB SAMPLINGDYNAMICS Conversiontime 16 SCLK Acquisitiontime 80 ns Maximumsamplerate(throughputrate) 40MHzSCLKwitha16-clockframe 2 MSPS Aperturedelay(5) 10 ns Aperturejitter(5) 10 ps Stepresponse(5)(2) 80 ns DYNAMICCHARACTERISTICS Totalharmonicdistortion(THD)(6) 20kHz,V =4.0V –85 dB REF 20kHz,V =4.0V 79 82 dB REF Signal-to-noiseratio(SNR) 100kHz,V =4.0V 80 dB REF Signal-to-noiseanddistortionratio(SINAD) 20kHz,V =4.0V 78.8 dB REF Spurious-freedynamicrange(SFDR) 20kHz,V =4.0V 86 dB REF Full-powerbandwidth(7) At–3dB 15 MHz DIGITALINPUT/OUTPUT Logicfamily CMOS V 0.7DVDD V IH V 0.3DVDD V IL Logiclevel V SDOload20pF 0.8DVDD V OH V SDOload20pF 0.2DVDD V OL Inputleakagecurrent I ,I 0<V <DVDD ±20 nA IH IL IN Externalreference 2.5 AVDD V (1) Idealinputspan;doesnotincludegainoroffseterror. (2) RefertoFigure76forsamplingcircuitdetails. (3) LSBmeansleastsignificantbit. (4) Measuredrelativetoanidealfull-scaleinput. (5) Ensuredbysimulation. (6) Calculatedonthefirstnineharmonicsoftheinputfrequency. (7) Indicatessignalbandwidthforundersamplingapplications. Copyright©2011,TexasInstrumentsIncorporated 5 ADS7945 ADS7946 ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 www.ti.com.cn ELECTRICAL CHARACTERISTICS: ADS7946 (Single-Ended) (continued) Minimum/maximumspecificationsatT =–40°Cto+125°C,AVDD=2.7Vto5.25V,DVDD=1.65VtoAVDD, A andf =2MSPS,unlessotherwisenoted. SAMPLE TypicalspecificationsatT =+25°C,AVDD=5V,DVDD=1.8V,andf =2MSPS. A SAMPLE PARAMETER TESTCONDITIONS MIN TYP MAX UNITS POWER-SUPPLYREQUIREMENTS AVDD 2.7 3.3 5.25 V DVDD 1.65 3.3 AVDD V AVDD=3.3V,f =2MSPS 3.5 4 mA SAMPLE I DYNAMIC AVDD=5V,f =2MSPS 4 5 mA SAMPLE AVDDsupplycurrent AVDD=3.3V,SCLKoff 2.3 mA I STATIC AVDD=5V,SCLKoff 2.5 3 mA DVDDsupplycurrent(8) DVDD=3.3V,fSAMPLE=2MSPS, 750 µA SDOload20pF Power-downstate IPD-DYNAMIC SCLK=40MHz 550 µA AVDDsupplycurrent I SCLKoff 2.5 µA PD-STATIC Power-uptime Frompower-downstateusingPDENpin 1 µs TEMPERATURERANGE Specifiedperformance –40 +125 °C (8) DVDDconsumesonlydynamiccurrent.I =C ×DVDD×numberof0→1transitionsinSDO×f . DVDD LOAD SAMPLE Thisisaload-dependentcurrentandthereisnoDVDDcurrentwhentheoutputisnottoggling. THERMAL INFORMATION ADS7945/6 THERMALMETRIC(1) RTE UNITS 16PINS θ Junction-to-ambientthermalresistance 54.3 JA θ Junction-to-case(top)thermalresistance 53.7 JCtop θ Junction-to-boardthermalresistance 19.2 JB °C/W ψ Junction-to-topcharacterizationparameter 0.3 JT ψ Junction-to-boardcharacterizationparameter 14.5 JB θ Junction-to-case(bottom)thermalresistance 5.2 JCbot (1) 有关传统和新的热度量的更多信息,请参阅IC封装热度量应用报告SPRA953。 6 Copyright©2011,TexasInstrumentsIncorporated ADS7945 ADS7946 www.ti.com.cn ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 PARAMETER MEASUREMENT INFORMATION TIMING DIAGRAM: ADS7945, ADS7946 Sample Sample N N + 1 1/f SAMPLE t t CONV ACQ CS t t t t t SU1 WH WL D4 W1 SCLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 t t t t D1 H1 D2 D3 SDO D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Data from Sample N-1 Table1. TIMINGREQUIREMENTS:ADS7945,ADS7946(1)(2) PARAMETER TESTCONDITIONS(2) MIN TYP MAX UNIT tCONV Conversiontime 16 SCLK tACQ Acquisitiontime 80 ns SCLK=40MHz, fSAMPLE Samplerate(throughputrate) 16-clockframe 2 MSPS tW1 PulsewidthCShigh 25 ns DVDD=1.8V 14.5 ns tD1 Delaytime,CSlowtofirstdata(D0-15)out DVDD=3V 12.5 ns DVDD=5V 8.5 ns DVDD=1.8V 3.5 ns tSU1 Setuptime,CSlowtofirstrisingedgeofSCLK DVDD=3V 3.5 ns DVDD=5V 3.5 ns DVDD=1.8V 11 ns tD2(3) Delaytime,SCLKfallingtoSDO DVDD=3V 9 ns DVDD=5V 7.1 ns DVDD=1.8V 4 ns tH1 Holdtime,SCLKfallingtodatavalid DVDD=3V 3 ns DVDD=5V 2 ns DVDD=1.8V 15 ns tD3 Delaytime,CShightoSDO3-state DVDD=3V 12.5 ns DVDD=5V 8.5 ns DelaytimeCSrisingedgefromconversionend 10 tD4 (refertothetCONVspecificationforconversiontime) ns tWH Pulseduration,SCLKhigh 8 ns tWL Pulseduration,SCLKlow 8 ns SCLKfrequency 40 MHz tPDSU Setuptime,PDENhightoCSrisingedge 2 ns (refertoFigure84andFigure85) tPDH Holdtime,CSrisingedgetoPDENfallingedge(refertoFigure84) 20 ns (1) AllspecificationsareensuredbysimulationsatT =–40°Cto+125°C,andDVDD=1.65VtoAVDD,unlessotherwisenoted. A (2) 1.8Vspecificationsapplyfrom1.65Vto2V;3Vspecificationsapplyform2.7Vto3.6V;5Vspecificationsapplyfrom4.75Vto 5.25V. (3) With20pFload. Copyright©2011,TexasInstrumentsIncorporated 7 ADS7945 ADS7946 ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 www.ti.com.cn PIN CONFIGURATION ADS7945 (DIFFERENTIAL) RTEPACKAGE QFN-16 (TOPVIEW) D K D O L V D C S D S S C 6 5 4 3 1 1 1 1 GND 1 12 PDEN AVDD 2 11 CH SEL ADS7945 REF 3 10 NC REFGND 4 9 NC 5 6 7 8 P N N P 0 0 1 1 N N N N AI AI AI AI Table2. PINFUNCTIONS PIN NO. PINNAME FUNCTION DESCRIPTION 1 GND Analog/digital Powersupplyground;allanaloganddigitalsignalsarereferredwithrespecttothispin 2 AVDD Analog ADCpowersupply 3 REF Analog ADCpositivereferenceinput;decouplethispinwithREFGND 4 REFGND Analog Referencereturn;shorttoanaloggroundplane 5 AIN0P Analoginput Positiveanaloginput,channel0 6 AIN0N Analoginput Negativeanaloginput,channel0 7 AIN1N Analoginput Negativeanaloginput,channel1 8 AIN1P Analoginput Positiveanaloginput,channel1 9 NC — Notconnectedinternally,itisrecommendedtoexternallyshortthispintoGND 10 NC — Notconnectedinternally,itisrecommendedtoexternallyshortthispintoGND Thispinselectstheanaloginputchannel. Low=Channel0 11 CHSEL Digitalinput High=Channel1 Itisrecommendedtochangethechannelwithinawindowofoneclock;fromhalfaclockaftertheCS fallingedge.Thischangeensuresthesettlingonthemultiplexeroutputbeforethesamplestart. 12 PDEN Digitalinput Thispinenablesapower-downfeatureifitishighattheCSrisingedge 13 CS Digitalinput Chipselectsignal;activelow 14 SCLK Digitalinput SerialSPIclock 15 SDO Digitaloutput Serialdataout 16 DVDD Digital DigitalI/Osupply 8 Copyright©2011,TexasInstrumentsIncorporated ADS7945 ADS7946 www.ti.com.cn ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 PIN CONFIGURATION ADS7946 (SINGLE-ENDED) RTEPACKAGE QFN-16 (TOPVIEW) D K D O L V D C S D S S C 6 5 4 3 1 1 1 1 GND 1 12 PDEN AVDD 2 11 CH SEL ADS7946 REF 3 10 NC REFGND 4 9 NC 5 6 7 8 0 D D 1 N N N N AI G G AI 0 1 N N AI AI Table3. PINFUNCTIONS PIN NO. PINNAME FUNCTION DESCRIPTION 1 GND Analog/digital Powersupplyground;allanaloganddigitalsignalsarereferredwithrespecttothispin 2 AVDD Analog ADCpowersupply 3 REF Analog ADCpositivereferenceinput;decouplethispinwithREFGND 4 REFGND Analog Referencereturn;shorttoanaloggroundplane 5 AIN0 Analoginput Positiveanaloginput,channel0 6 AIN0GND Analoginput Groundsenseanaloginput,channel0 7 AIN1GND Analoginput Groundsenseanaloginput,channel1 8 AIN1 Analoginput Positiveanaloginput,channel1 9 NC — Notconnectedinternally,itisrecommendedtoexternallyshortthispintoGND 10 NC — Notconnectedinternally,itisrecommendedtoexternallyshortthispintoGND Thispinselectstheanaloginputchannel. Low=Channel0 11 CHSEL Digitalinput High=Channel1 Itisrecommendedtochangethechannelwithinawindowofoneclock;fromhalfaclockaftertheCS fallingedge.Thischangeensuresthesettlingonthemultiplexeroutputbeforethesamplestart. 12 PDEN Digitalinput Thispinenablesapower-downfeatureifitishighattheCSrisingedge 13 CS Digitalinput Chipselectsignal;activelow 14 SCLK Digitalinput SerialSPIclock 15 SDO Digitaloutput Serialdataout 16 DVDD Digital DigitalI/Osupply Copyright©2011,TexasInstrumentsIncorporated 9 ADS7945 ADS7946 ZHCS316B–JUNE2011–REVISEDSEPTEMBER2011 www.ti.com.cn TYPICAL CHARACTERISTICS: ADS7945 AtT =+25°C,AVDD=5V,DVDD=1.8V,V =2.5V,andf =2MSPS,unlessotherwisenoted. A REF SAMPLE DNLvsANALOGSUPPLYVOLTAGE DNLvsREFERENCEVOLTAGE 1.5 1.5 y (LSB) 1 Maximum DNL y (LSB) 1 Maximum DNL earit 0.5 earit 0.5 n n nli nli o o N N al 0 Minimum DNL al 0 Minimum DNL nti nti e e Differ −0.5 Differ −0.5 AVDD = 5.25 V −1 −1 2.7 3.2 3.7 4.2 4.7 5.2 5.7 2.5 3 3.5 4 4.5 5 5.5 AVDD, Analog Supply Voltage (V) Reference Voltage (V) G006 G010 Figure1. Figure2. DNLvsFREE-AIRTEMPERATURE INLvsANALOGSUPPLYVOLTAGE 1.5 1.5 LSB) 1 Maximum DNL SB) 1 Maximum INL ential Nonlinearity ( 0.05 Minimum DNL gral Nonlinearity (L −00..055 Minimum INL Differ −0.5 Inte −1 −1 −1.5 −40 −25 −10 5 20 35 50 65 80 95 110 125 2.7 3.2 3.7 4.2 4.7 5.2 5.7 Free-Air Temperature (°C) AVDD, Analog Supply Voltage (V) G008 G007 Figure3. Figure4. INLvsREFERENCEVOLTAGE INLvsFREE-AIRTEMPERATURE 1.5 1.5 1 1 Maximum INL SB) Maximum INL SB) L L y ( 0.5 y ( 0.5 arit arit e e Nonlin 0 Minimum INL Nonlin 0 Minimum INL al −0.5 al −0.5 gr gr e e nt nt I −1 I −1 AVDD = 5.25 V −1.5 −1.5 2.5 3 3.5 4 4.5 5 5.5 −40 −25 −10 5 20 35 50 65 80 95 110 125 Reference Voltage (V) Free-Air Temperature (°C) G011 G009 Figure5. Figure6. 10 Copyright©2011,TexasInstrumentsIncorporated

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The ADS7945/6 are 14-bit, 2 MSPS analog-to-digital. 23• Sample Rate: 2 1.5 LSB (max) (ADS7945) two-channel input multiplexer and a low-power.
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