AMC7891 www.ti.com SBAS518A–AUGUST2011–REVISEDDECEMBER2011 Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs CheckforSamples:AMC7891 FEATURES APPLICATIONS 1 • 10-Bit,500-kSPSSAR ADC: • CellularBaseStations 23 – 8ExternalAnalogInputs • RFCommunicationSystems – V ,2 ×V InputRanges • OpticalNetworks REF REF • Four10-BitMonotonicDACs: • General-PurposeMonitor andControl – 0to5-VOutputRange DESCRIPTION – Upto10-mA Sinkand SourceCapability The AMC7891 is a highly-integrated, low-power, – Power-OnResetto0V complete analog monitoring and control system in a • Internal2.5-VReference verysmallpackage. • InternalTemperatureSensor: For monitoring functions, the AMC7891 has 8 – –40°Cto+125°COperation uncommitted inputs multiplexed into a 10-bit SAR – Accuracyof ±2.5°C analog-to-digital converter (ADC) and an accurate on-chip temperature sensor. Control signals are • 12General-PurposeI/OPorts: generated through four, independent, 10-bit – 1.8-Vto5.5-V Operation digital-to-analog converters (DACs). Additional digital • Low-PowerSPI™-CompatibleSerialInterface: signalmonitoringandcontrolisaccomplishedthrough twelve configurable GPIOs. An internal reference can – 4-WireMode, 1.8-V to5.5-V Operation beusedtodrivetheADCandDACs. – SCLKupto30MHz Communication to the device is performed through a • TemperatureRange:–40°Cto+105°C versatile, four-wire serial interface compatible with • LowPower: 32.5mWat5V,FullOperating industry-standard microprocessors and Conditions microcontrollers. The serial interface can operate at • Space-SavingPackage:36-pin, clock rates up to 30 MHz, allowing quick access to criticalsystem data. 6-mmx6-mmQFN The device is characterized for operation over the AMC7891 2.5-V Reference temperature range of –40ºC to 105ºC and is available inaverysmall, 36-pin,6-mmx6-mm QFNpackage. DAC The AMC7891’s low power, small size and Eight Analog Inputs MUX ADC DDAACC Four DAC Outputs hcpffoeiiorguacwhntuue-diirtrneiftanoesmrgeRrpmtaFlitiofisiocdenoerssmrimmn(maPiRlakuAFern)lyicitatrabanatendinonsnliieodsfwetsiocay-rinslaomtlloeisiwomned-scug.aoleemTsnsthpe,elsrbifauiiAealcrsMhpsucCa(orLs7pnN8ottr9hsAoe1e)l TEMP monitor andcontrolsystems. SENSOR For applications that require a different channel Serial Interface SerialInterface DAC cTMoeouxnnaittso,rIandstdraiutnimodneanltCsfeooanfftteurorrsel sa,(coAorMmcCpol)entveePfratreomrdiluryecostsof.lAuntioaSnleoseg, GPIO Control http://www.ti.com/amc. 12 GPIOs 1 Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. SPIisatrademarkofMotorola,Inc. 2 Allothertrademarksarethepropertyoftheirrespectiveowners. 3 PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2011,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters. AMC7891 SBAS518A–AUGUST2011–REVISEDDECEMBER2011 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage. ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications. RHHPACKAGE QFN-36 (TOPVIEW) EF N7 N6 N5 N4 N3 N2 N1 N0 R AI AI AI AI AI AI AI AI 36 35 34 33 32 31 30 29 28 AVDD 1 27 GPIOA0 AGND1 2 26 GPIOA1 DGND 3 25 GPIOA2 GPIOVDD 4 24 GPIOA3 SPIV 5 23 GPIOB0 DD CS 6 22 GPIOB1 SCLK 7 21 GPIOB2 SDI 8 20 GPIOB3 SDO 9 19 DAV 10 11 12 13 14 15 16 17 18 T3 T2 T1 T0 D2 C3 C2 C1 C0 U U U U N O O O O ACO ACO ACO ACO AG GPI GPI GPI GPI D D D D AMC7891PinFunctions PIN I/O DESCRIPTION NO. NAME 1 AV I Analogsupplyvoltage.(4.75Vto5.5V) DD 2 AGND1 I Analogground.Groundreferencepointforallanalogcircuitryonthedevice,AGND.ConnectAGND1and AGND2tothesamepotential,AGND. 3 DGND I Digitalground.Groundreferencepointforalldigitalcircuitryonthedevice.Ideally,AGNDandDGNDshould beatthesamepotentialandmustnotdifferbymorethan0.3V. 4 GPIOV I GPIOsupplyvoltage.(1.8Vto5.5V) DD SetstheGPIOoperatingvoltageandthresholdlevels. 5 SPIV I Serialinterfacesupplyvoltage.(1.8Vto5.5V) DD Setstheserialinterfaceoperatingvoltageandthresholdlevels. 6 CS I Activelowserialdataenable.Schmitt-triggerlogicinput. Thisinputistheframesynchronizationsignalfortheserialdata.Whenthissignalgoeslow,itenablesthe inputshiftregisteranddataissampledonsubsequentfallingclockedges.TheDACoutputandregister settingsupdatefollowingthe24thclock.IfCSgoeshighbeforethe23thclockedge,thecommandis ignored. 7 SCLK I Serialinterfaceclock.Schmitt-triggerlogicinput. MaximumSCLKrateis30MHz. 8 SDI I Serialinterfacedatainput.Schmitt-triggerlogicinput. DataisclockedintotheinputshiftregisteroneachfallingedgeofSCLK. 9 SDO O Serialinterfacedataoutput.TheSDOpinisinhighimpedancewhenCSishigh. DataisclockedoutoftheinputshiftregisteroneachrisingedgeofSCLK. 10 DACOUT3 O DAC3bufferedoutput.(0VtoAV ). DD Cansource/sinkupto10mA. 2 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):AMC7891 AMC7891 www.ti.com SBAS518A–AUGUST2011–REVISEDDECEMBER2011 AMC7891PinFunctions (continued) PIN I/O DESCRIPTION NO. NAME 11 DACOUT2 O DAC2bufferedoutput.(0VtoAV ). DD Cansource/sinkupto10mA. 12 DACOUT1 O DAC1bufferedoutput.(0VtoAV ). DD Cansource/sinkupto10mA. 13 DACOUT0 O DAC0bufferedoutput.(0VtoAV ). DD Cansource/sinkupto10mA. 14 AGND2 I Analogground.Groundreferencepointforallanalogcircuitryonthedevice,AGND.ConnectAGND1and AGND2tothesamepotential,AGND. 15 GPIOC3 I/O GeneralpurposedigitalI/OC3.MaximumvoltageissetbyGPIOV DD 16 GPIOC2 I/O GeneralpurposedigitalI/OC2.MaximumvoltageissetbyGPIOV DD 17 GPIOC1 I/O GeneralpurposedigitalI/OC1.MaximumvoltageissetbyGPIOV DD 18 GPIOC0 I/O GeneralpurposedigitalI/OC0.MaximumvoltageissetbyGPIOV DD 19 DAV O ADCdataavailableindicator.Open-drain,activelowoutput. Indirect-mode,DAVgoeslowwhenanADCconversioncyclefinishes.Inauto-modea1µspulseappears onthispinwhentheconversioncyclefinishes(seeADCOperationfordetails).DAVstayshighwhen deactivated.Ifused,anexternal10kΩpull-upresistortoGPIOV isrequired.Ifunused,thepincanbe DD connectedtoDGND. 20 GPIOB3 I/O GeneralpurposedigitalI/OB3.MaximumvoltageissetbyGPIOV DD 21 GPIOB2 I/O GeneralpurposedigitalI/OB2.MaximumvoltageissetbyGPIOV DD 22 GPIOB1 I/O GeneralpurposedigitalI/OB1.MaximumvoltageissetbyGPIOV DD 23 GPIOB0 I/O GeneralpurposedigitalI/OB1.MaximumvoltageissetbyGPIOV DD 24 GPIOA3 I/O GeneralpurposedigitalI/OA3.MaximumvoltageissetbyGPIOV DD 25 GPIOA2 I/O GeneralpurposedigitalI/OA2.MaximumvoltageissetbyGPIOV DD 26 GPIOA1 I/O GeneralpurposedigitalI/OA1.MaximumvoltageissetbyGPIOV DD 27 GPIOA0 I/O GeneralpurposedigitalI/OA1.MaximumvoltageissetbyGPIOV DD 28 AIN0 I Uncommittedanaloginput0.(0Vto5V) 29 AIN1 I Uncommittedanaloginput1.(0Vto5V) 30 AIN2 I Uncommittedanaloginput2.(0Vto5V) 31 AIN3 I Uncommittedanaloginput3.(0Vto5V) 32 AIN4 I Uncommittedanaloginput4.(0Vto5V) 33 AIN5 I Uncommittedanaloginput5.(0Vto5V) 34 AIN6 I Uncommittedanaloginput6.(0Vto5V) 35 AIN7 I Uncommittedanaloginput7.(0Vto5V) 36 REF I/O UsedasexternalADCreferenceinputwhentheinternalreferencebufferisdisabledinregisterAMC_power, ref_on=‘0’(default).Adecouplingcapacitorisrecommendedbetweentheexternalreferenceoutputan AGNDfornoisefiltering. UsedasinternalreferenceoutputwhentheinternalreferencebufferisenabledinregisterAMC_power, ref_on=‘1’.Requiresa4.7µFdecouplingcapacitortoAGNDwhenusedasreferenceoutput.Anexternal bufferamplifierwithhighimpedanceinputisrequiredtodriveanexternalload. – THERMAL – Thethermalpadislocatedonthepackageunderside.Connecttotheboardgroundplaneusingmultiple PAD vias. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLink(s):AMC7891 AMC7891 SBAS518A–AUGUST2011–REVISEDDECEMBER2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM AMC7891 Internal Reference REF (2.5V) ref_on AIN0 AIN1 AIN2 DAC0 DACOUT0 10-Bit AIN3 xer e 10-Bit AIN4 ultipl ADC dac0_clear M DAC1 AIN5 10-Bit DACOUT1 AIN6 Temperature Sensor dac1_clear AIN7 DAC2 DACOUT2 10-Bit Configuration DAV Registers dac2_clear DAC3 DACOUT3 10-Bit dac3_clear CS al er SCLK eriphPerface SDI erial Int AV S DD SDO GPIOV GPIO Control DD SPIV DD GPIOA0 GPIOA1 GPIOA2 GPIOA3 GPIOB0 GPIOB1 GPIOB2 GPIOB3 GPIOC0 GPIOC1 GPIOC2 GPIOC3 AGND1 AGND2 DGND 4 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):AMC7891 AMC7891 www.ti.com SBAS518A–AUGUST2011–REVISEDDECEMBER2011 ORDERINGINFORMATION(1) PACKAGE TRANSPORT TA ORDERCODE DRAWING/TYPE(2)(3) MEDIA QUANTITY AMC7891SRHHT 250 –40°Cto105°C RHH/36-QFNQuadFlatpackNo-Lead TapeandReel AMC7891SRHHR 2000 (1) ForthemostcurrentpackageandorderinginformationseethePackageOptionAddendumattheendofthisdocument,orseethe deviceproductfolderatwww.ti.com. (2) ThermalPadSize:4.39mmx4.39mm (3) MSLPeakTemperature:Level-3-260C-168HR ABSOLUTE MAXIMUM RATINGS(1) Overoperatingfree-airtemperaturerange,unlessotherwisenoted. VALUE UNIT MIN MAX AV toAGND(2) –0.3 6 V DD GPIOV toDGND –0.3 6 V DD Supplyvoltagerange SPIV toDGND –0.3 6 V DD AGNDtoDGND –0.3 0.3 V AIN[0:7],DACOUT[0:3],REFtoAGND –0.3 AV +0.3 V DD CS,SCLK,SDItoDGND –0.3 6 V Pinvoltagerange SDOtoDGND –0.3 SPIV +0.3 V DD GPIOA[0:3],GPIOB[0:3],GPIOC[0:3]toDGND –0.3 GPIOV +0.3 V DD DAVtoDGND –0.3 6 V Operatingfree-airtemperaturerange,T :AMC7891 (3)(4) –40 105 °C A Storagetemperaturerange –40 150 °C Humanbodymodel(HBM) 2.5 kV ESDratings: Chargeddevicemodel(CDM) 1.0 kV (1) StressesabovethoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Exposuretoabsolute maximumconditionsforextendedperiodsmayaffectdevicereliability. (2) AGND1andAGND2mustbetiedtogetherasAGND. (3) Airfloworheatsinkingreducesθ andmayberequiredforsustainedoperationat105°Candmaximumoperatingconditions. JA (4) Solderingthedevicethermalpadtotheboardgroundplaneisstronglyrecommended. THERMAL INFORMATION AMC7891 THERMALMETRIC(1) RHHPACKAGE UNITS 36PINS θ Junction-to-ambientthermalresistance 30.6 JA θ Junction-to-case(top)thermalresistance 16.0 JCtop θ Junction-to-boardthermalresistance 5.3 JB °C/W ψ Junction-to-topcharacterizationparameter 0.2 JT ψ Junction-to-boardcharacterizationparameter 5.3 JB θ Junction-to-case(bottom)thermalresistance 0.8 JCbot (1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLink(s):AMC7891 AMC7891 SBAS518A–AUGUST2011–REVISEDDECEMBER2011 www.ti.com ELECTRICAL CHARACTERISTICS (DAC SPECIFICATIONS) AV =4.75to5.5V,GPIOV =1.8to5.5V,SPIV =1.8to5.5V,AGND=DGND=0V,ExternalADCreference=AV , DD DD DD DD T =–40°Cto105°C(unlessotherwisenoted) A PARAMETER TESTCONDITIONS MIN TYP MAX UNIT STATICACCURACY Resolution 10 Bits INL Relativeaccuracy ±0.05 ±1 LSB DNL Differentialnonlinearity Specifiedmonotonic ±0.1 ±1 LSB Offseterror Code0x008 ±0.5 ±5 mV Gainerror ±0.025 ±0.2 %FSR Offsettemperaturecoefficient ±1 ppm/°C Gaintemperaturecoefficient ±1 ppm/°C DACOUTPUT (1) Fullscaleoutputvoltagerange 0 AV V DD Transition:Code0x008to0x3F8towithin1/2LSB, Outputvoltagesettlingtime 5 µs C =2nF,RL=∞ L Slewrate 2 V/µs Shortcircuitcurrent Full-scalecurrentshortedtogroundorpulledtoAVDD ±30 mA Loadcurrent Sourceand/orsinkwithin300mVofsupply ±10 mA Capacitiveloadstability R =∞ 10 nF L DCoutputimpedance 1 Ω Power-onovershoot AV 0to5V,2msramp 10 mV DD Glitchenergy Transition:Code0x1FFto0x200;0x200to0x1FF 0.15 nV-s T =25°C,1kHz 260 nV/√Hz A Outputnoise Integratednoisefrom0.1Hzto10Hz 20 µV PP (1) Specifiedbydesignandcharacterization.Nottestedduringproduction. 6 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):AMC7891 AMC7891 www.ti.com SBAS518A–AUGUST2011–REVISEDDECEMBER2011 ELECTRICAL CHARACTERISTICS – (ADC SPECIFICATIONS) AV =4.75to5.5V,GPIOV =1.8to5.5V,SPIV =1.8to5.5V,AGND=DGND=0V,ExternalADCreference=AV , DD DD DD DD T =–40°Cto105°C(unlessotherwisenoted) A PARAMETER TESTCONDITIONS MIN TYP MAX UNIT DCACCURACY Resolution 10 Bits INL Integralnonlinearity ±0.1 ±1 LSB DNL Differentialnonlinearity Specifiedmonotonic ±0.1 ±1 LSB Offseterror ±0.5 ±2 LSB Offseterrormatch ±0.4 LSB Gainerror ±0.5 ±2 LSB Gainerrormatch ±0.4 LSB CONVERSIONTIME ADCconversionrate 500 kSPS Autocycleupdaterate All8ADCinputchannelsenabled 16 µs Throughputrate SCLK≥12MHz,singleanalogchannel 500 kSPS Conversiondelay Delayfromtriggertoconversionstart 2 4 µs ANALOGINPUT Absoluteinputvoltagerange Independentofgainsetting AGND–0.2 AV +0.2 V DD Gain=1,adcn_gain='0' 0 V V REF Fullscaleinputvoltagerange Gain=2,adcn_gain='1' 0 2×V V REF Inputcapacitance(1) 40 pF DCinputleakagecurrent MeasuredwithADCinHoldmode ±1 µA ACPERFORMANCE SFDR SpuriousFreeDynamicRange f =1kHz,–1dBFSsinewave 76 dBc IN SNR SignaltoNoiseRatio f =1kHz,–1dBFSsinewave 61 dBc IN SINAD SignaltoNoise+DistortionRatio f =1kHz,–1dBFSsinewave 60.5 dBc IN f =1kHz,–1dBFSsinewave,Measured THD TotalHarmonicDistortion IN 75 dBc uptothefifthharmonic INTERNALADCREFERENCE (2) InternalADCreferencebufferedoutputat V Referenceoutputvoltage 2.5 V REF REFpin Referencebufferpower AV =5V 360 µA DD Referencetemperaturecoefficient 10 ppm/°C EXTERNALADCREFERENCE V Referenceinputvoltage ExternalADCreferenceinputtoREFpin 0.3 AVDD V REF Inputresistance(1) V =5V,AIN=5V 20 kΩ REF TEMPERATURESENSOR Operatingrange –40 125 °C Accuracy T =–40°Cto125°C,AV =5V ±1 ±2.5 °C A DD Resolution LSBsize 0.125 °C Conversiontime 15 ms (1) Specifiedbydesign.Nottestedduringproduction. (2) Useanexternalbufferamplifierwithhighimpedanceinputtodriveanyexternalload. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLink(s):AMC7891 AMC7891 SBAS518A–AUGUST2011–REVISEDDECEMBER2011 www.ti.com ELECTRICAL CHARACTERISTICS – GENERAL SPECIFICATIONS AV =4.75to5.5V,GPIOV =1.8to5.5V,SPIV =1.8to5.5V,AGND=DGND=0V,ExternalADCreference=AV , DD DD DD DD T =–40°Cto105°C(unlessotherwisenoted) A PARAMETER TESTCONDITIONS MIN TYP MAX UNIT GENERALPURPOSEI/O GPIOV =1.8V 0.7×GPIOV V DD DD V High-levelinputvoltage IH GPIOV =3.3to5.5V 2.1 V DD GPIOV =1.8V 0.3 V DD V Low-levelinputvoltage IL GPIOV =3.3to5.5V 0.8 V DD I =1.6mA,GPIOV =1.8V,AllGPIOs load DD GPIOV -0.25 V loadedandsetto'1' DD V High-leveloutputvoltage OH I =1.6mA,GPIOV =3.3to5.5V,All load DD GPIOV -0.2 V GPIOsloadedandsetto'1' DD V Low-leveloutputvoltage I =-1.6mA,AllGPIOsloaded 0.4 V OL load Inputcapacitance (1) 1 pF Highimpedanceoutput capacitance (1) 1 pF LOGICINPUTS:CS,SDI,SCLK SPIV =1.8V 0.7×SPIV V DD DD V High-levelinputvoltage IH SPIV =3.3to5.5V 2.1 V DD SPIV =1.8V 0.3 V DD V Low-levelinputvoltage IL SPIV =3.3to5.5V 0.7 V DD Inputcurrent ±1 µA Inputcapacitance (1) 1 pF Highimpedanceoutput capacitance (1) 1 pF LOGICOUTPUT:SDO V High-leveloutputvoltage I =1.6mA SPIV -0.2 V OH load DD V Low-leveloutputvoltage I =-1.6mA 0.4 V OL load LOGICOUTPUT:DAV V Low-leveloutputvoltage I =-2mA 0.4 V OL load POWERREQUIREMENTS AV 4.75 5 5.5 V DD GPIOV 1.8 5.5 V DD SPIV 1.8 5.5 V DD I Totalsupplycurrent,AVDD+ Operatingmode(2) 6.5 10 mA DD GPIOV +SPIV DD DD Powerdownmode 1.25 2 mA Powerconsumption Operatingmode(2) 32.5 55 mW Powerdownmode 6.25 11 mW OPERATINGRANGE Specifiedtemperaturerange –40 25 105 °C (1) Specifiedbydesign.Nottestedinproduction. (2) AV =GPIOV =SPIV =5V.NoDACload,allDACsat0x200codeandADCatthefastestautoconversionrate. DD DD DD 8 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):AMC7891 AMC7891 www.ti.com SBAS518A–AUGUST2011–REVISEDDECEMBER2011 TIMING SPECIFICATIONS(1)(2) AV =4.75to5.5V,GPIOV =1.8to5.5V,SPIV =1.8to5.5V,AGND=DGND=0V,ExternalADCreference=AV , DD DD DD DD T =–40°Cto105°C(unlessotherwisenoted). A PARAMETER TESTCONDITIONS MIN TYP MAX UNIT SPIV =5.5V 30 MHz DD f SCLKfrequency SPIV =2.7V 15 MHz SCLK DD SPIV =1.8V 10 MHz DD t Inputrisetime 10%to90%ofSPIV 2 ns R DD t Inputfalltime 10%to90%ofSPIV 2 ns F DD SPIV =5.5V 33 ns DD t SCLKcycletime SPIV =2.7V 66 ns 1 DD SPIV =1.8V 100 ns DD SPIV =5.5V 13 ns DD t SCLKhightime SPIV =2.7V 30 ns 2 DD SPIV =1.8V 50 ns DD SPIV =5.5V 13 ns DD t SCLKlowtime SPIV =2.7V 26 ns 3 DD SPIV =1.8V 40 ns DD t Framestarttime CSfallingedgetoSCLKrisingedge 5 ns 4 t SDIsetuptime SDIvalidtofallingedgeofSCLK 4 ns 5 t SDIholdtime SDIvalidafterfallingedgeofSCLK 12 ns 6 t Framestoptime SCLKfallingedgetoCSrisingedge 15 ns 7 t CShightime 50 ns 8 SPIV =5.5V,C =10pF,1ns≤t ≤4ns 5 16 ns DD L R,F(SDO) t SDOdelay SPIV =2.7V,C =10pF,1ns≤t ≤5ns 6 22 ns 9 DD L R,F(SDO) SPIV =1.8V,C =10pF,2ns≤t ≤8ns 8 39 ns DD L R,F(SDO) t Waittime CSrisingedgetonextSCLKrisingedge 5 ns 10 (1) Specifiedbydesign.Nottestedduringproduction. (2) DigitalinputsandoutputstimedfromavoltagelevelofSPIV /2. DD TIMING INFORMATION t8 t4 t7 CS t1 tf t10 SCLK t2 t3 tr SDI Bit23 Bit1 Bit0 t5 t6 Figure1. Serial InterfaceWriteTimingDiagram t8 t4 t7 CS t1 tf tr SCLK t2 t3 Read Command Any Command SDI Bit23 Bit0 Bit23 Bit1 Bit0 t5 t6 t9 SDO Bit23 Bit1 Bit0 Data read from the register selected in previous operation Figure2. Serial InterfaceReadTimingDiagram Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLink(s):AMC7891 AMC7891 SBAS518A–AUGUST2011–REVISEDDECEMBER2011 www.ti.com TYPICAL CHARACTERISTICS: DAC AV =5V,GPIOV =5V,SPIV =5V,AGND=DGND=0V,ExternalADCreference=AV DD DD DD DD (unlessotherwisenoted) 1.000 1.000 0.750 0.750 0.500 0.500 B) 0.250 B) 0.250 S S NL (L 0.000 NL (L 0.000 I−0.250 D−0.250 −0.500 −0.500 −0.750 −0.750 T=25ºC T=25ºC −1.000 −1.000 0 128 256 384 512 640 768 896 1024 0 128 256 384 512 640 768 896 1024 Code Code G001 G002 Figure3.DACINTEGRALNON-LINEARITY Figure4.DACDIFFERENTIALNON-LINEARITY 1.000 1.000 0.750 0.750 0.500 INL Max 0.500 DNL Max B) 0.250 B) 0.250 S S NL (L 0.000 NL (L 0.000 I−0.250 D−0.250 −0.500 INL Min −0.500 DNL Min −0.750 −0.750 −1.000 −1.000 −40 −20 0 20 40 60 80 100 120 −40 −20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) G003 G004 Figure5.DACINLvs.TEMPERATURE Figure6.DACDNLvs.TEMPERATURE 5 200 4 150 3 V) 2 SR) 100 or (m 1 m%F 50 Err 0 or ( 0 Offset −−21 ain Err −50 G−100 −3 −150 −4 −5 −200 −40 −20 0 20 40 60 80 100 120 −40 −20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) G005 G006 Figure7.DACOFFSETERRORvs.TEMPERATURE Figure8.DACGAINERRORvs.TEMPERATURE 10 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):AMC7891