NI 6221 (37-Pin)

1 DEVICE SPECIFICATIONSNI 6221 (37-Pin)M Series data acquisition : 16 AI, 10 DIO, 2 AOThe following specifications are typical at 25 C, unless otherwise noted. For moreinformation about the NI PCI-6221 (37-pin), refer to the M Series User Manual available at InputNumber of channels8 differential or 16 single endedADC resolution16 bitsDNLNo missing codes guaranteedINLR efer to the AI Absolute Accuracy sectionSample rateSingle channel maximum250 kS/sMultichannel maximum (aggregate)250 kS/sMinimumNo minimumTiming accuracy50 ppm of sample rateTiming resolution50 nsInput couplingDCInput range V, 1 V, 5 V, 10 VMaximum working voltage for analoginputs (signal + common mode) 11 V of AI GNDCMRR (DC to 60 Hz)

2 92 dBInput impedanceDevice onAI+ to AI GND>10 G in parallel with 100 pFAI- to AI GND>10 G in parallel with 100 pFDevice offAI+ to AI GND820 AI- to AI GND820 Input bias current 100 pACrosstalk (at 100 kHz)Adjacent channels-75 dBNon-adjacent channels-90 dBSmall signal bandwidth (-3 dB)700 kHzInput FIFO size4,095 samplesScan list memory4,095 entriesData transfersDMA (scatter-gather), interrupts,programmed I/OOvervoltage protection for all analog input and sense channelsDevice on 25 V for up to two AI pinsDevice off 15 V for up to two AI pinsInput current during overvoltage condition 20 mA maximum/AI pinSettling Time for Multichannel MeasurementsAccuracy, full-scale step, all ranges 90 ppm of step ( 6 LSB)4 s convert interval 30 ppm of step ( 2 LSB)5 s convert interval 15 ppm of step ( 1 LSB)7 s convert interval2 | | ni 6221 (37-Pin) Device SpecificationsTypical Performance GraphsFigure 1.

3 Settling Error versus Time for Different Source Impedances1101001 k10 k1101001 k 2 k 5 k 10 k 100 Error (ppm of Step Size)Time (ms)Figure 2. AI Small Signal Bandwidth1 k10 k100 k1000 k10000 kFrequency (Hz)Normalized Signal Amplitude (dB) 14 12 10 8 6 4 202NI 6221 (37-Pin) Device Specifications | National Instruments | 3 Figure 3. AI CMRR020406080100120101001 k10 k100 kFrequency (Hz)CMRR (dB)10 V Range5 V Range1 V V RangeAI Absolute AccuracyNote Accuracies listed are valid for up to one year from the device 1. AI Absolute AccuracyNominalRangePositiveFullScaleNom inalRangeNegativeFullScaleResidualGainEr ror(ppm ofReading)ResidualOffsetError(ppm ofRange)OffsetTempco(ppm ofRange/ C)RandomNoise, ( Vrms)AbsoluteAccuracyat FullScale( V)Sensitivity( V) 10-107520572443, , Sensitivity is the smallest voltage change that can be detected.

4 It is a functionof tempco25 ppm/ CReference tempco5 ppm/ CINL error76 ppm of range4 | | ni 6221 (37-Pin) Device SpecificationsAI Absolute Accuracy EquationAbsoluteAccuracy = Reading (GainError) + Range (OffsetError) + NoiseUncertaintyGainError = ResidualAIGainError + GainTempco (TempChangeFromLastInternalCal)+ ReferenceTempco (TempChangeFromLastExternalCal)OffsetErr or = ResidualAIOffsetError + OffsetTempco (TempChangeFromLastInternalCal) + INLE rrorNoiseUncertainty = RandomNoise 3100 for a coverage factor of 3 and averaging100 Absolute Accuracy ExampleAbsolute accuracy at full scale on the analog input channels is determined using the followingassumptions: TempChangeFromLastExternalCal = 10 C TempChangeFromLastInternalCal = 1 C number_of_readings = 100 CoverageFactor = 3 For example, on the 10 V range, the absolute accuracy at full scale is as follows.

5 GainError = 75 ppm + 25 ppm 1 + 5 ppm 10 = 150 ppmOffsetError = 20 ppm + 57 ppm 1 + 76 ppm = 153 ppmNoiseUncertainty = 244 3100 = 73 VAbsoluteAccuracy = 10 V (GainError) + 10 V (OffsetError) + NoiseUncertainty =3,100 VAnalog OutputNumber of channels2 DAC resolution16 bitsDNL 1 LSBM onotonicity16 bit guaranteedMaximum update rate1 channel833 kS/s2 channels740 kS/s per channelTiming accuracy50 ppm of sample rateTiming resolution50 nsOutput range 10 VNI 6221 (37-Pin) Device Specifications | National Instruments | 5 Output couplingDCOutput Output current drive 5 mAOverdrive protection 25 VOverdrive current10 mAPower-on state 20 mVPower-off glitch400 mV for 200 msOutput FIFO size8,191 samples shared among channels usedData transfersDMA (scatter-gather), interrupts,programmed I/OAO waveform modesNon-periodic waveform, periodic waveformregeneration mode from onboard FIFO,periodic waveform regeneration from hostbuffer including dynamic updateSettling time, full-scale step,15 ppm (1 LSB)

6 6 sSlew rate15 V/ sGlitch energyMagnitude100 sAO Absolute AccuracyAbsolute accuracy at full-scale numbers is valid immediately following internal calibrationand assumes the device is operating within 10 C of the last external Accuracies listed are valid for up to one year from the device 2. AO Absolute AccuracyNominalRangePositiveFull ScaleNominalRangeNegativeFull ScaleResidualGain Error(ppm ofReading)GainTempco(ppm/ C)ResidualOffsetError (ppmof Range)OffsetTempco(ppm ofRange/ C)AbsoluteAccuracyat FullScale ( V) 10-1090104053,230 Reference tempco5 ppm/ CINL error128 ppm of range6 | | ni 6221 (37-Pin) Device SpecificationsAO Absolute Accuracy EquationAbsoluteAccuracy = OutputValue (GainError) + Range (OffsetError)GainError = ResidualGainError + GainTempco (TempChangeFromLastInternalCal) +ReferenceTempco (TempChangeFromLastExternalCal)OffsetErr or = ResidualOffsetError + AOOffsetTempco (TempChangeFromLastInternalCal)

7 + INLE rrorDigital I/O/PFIS tatic CharacteristicsNumber of channels10 total, 2 (P0.<0, 1>), 8 (PFI < >/P1)Ground referenceD GNDD irection controlEach terminal individually programmable asinput or outputPull-down resistor50 k typical, 20 k minimumInput voltage protection 20 V on up to two pins1 Waveform Characteristics (Port 0 Only)Terminals usedPort 0 (P0.<0,1>)Port/sample sizeUp to 2 bitsWaveform generation (DO) FIFO2,047 samplesWaveform acquisition (DI) FIFO2,047 samplesDI or DO Sample Clock frequency0 MHz to 1 MHz, system and bus activitydependentData transfersDMA (scatter-gather), interrupts,programmed I/ODI or DO Sample Clock source2 Any PFI, RTSI, AI Sample or Convert Clock,AO Sample Clock, Ctr n Internal Output, andmany other signals1 Stresses beyond those listed under Input voltage protection may cause permanent damage to digital subsystem does not have its own dedicated internal timing engine.

8 Therefore, a sampleclock must be provided from another subsystem on the device or an external 6221 (37-Pin) Device Specifications | National Instruments | 7 PFI/Port 1 FunctionalityFunctionalityStatic digital input, static digital output,timing input, timing outputTiming output sourcesMany AI, AO, counter, DI, DO timing signalsDebounce filter settings125 ns, s, ms, disable; high andlow transitions; selectable per inputRecommended Operating ConditionsLevelMinimumMaximum Input high voltage (VIH) VInput low voltage (VIL)0 VOutput high current (IOH) P0.<0,1>--24 mAOutput high current (IOH) PFI < >/P1--16 mAOutput low current (IOL) P0.<0,1>-24 mAOutput low current (IOL) PFI < >/P1-16 mAElectrical CharacteristicsLevelMinimumMaximum Positive-going threshold (VT+) VNegative-going threshold (VT-) V Delta VT hystersis (VT+ - VT-) V IIL input low current (Vin = 0 V) -10 AIIH input high current (Vin = 5 V) 250 A8 | | ni 6221 (37-Pin) Device SpecificationsDigital I/O CharacteristicsFigure 4.

9 P0.<0,1>: Ioh versus Voh 50 45 40 35 30 25 20 15 10 5023456 Voh (V)Ioh (mA)55 C; Vdd = V25 C; Vdd = V0 C; Vdd = VFigure 5. PFI < >/P1: Ioh versus Voh 50 45 40 35 30 25 20 15 10 5023456 Voh (V)Ioh (mA)55 C; Vdd = V25 C; Vdd = V0 C; Vdd = VNI 6221 (37-Pin) Device Specifications | National Instruments | 9 Figure 6. P0.<0,1>: Iol versus (V)Iol (mA)55 C; Vdd = V25 C; Vdd = V0 C; Vdd = VFigure 7. PFI < >/P1: Iol versus (V)Iol (mA)55 C; Vdd = V25 C; Vdd = V0 C; Vdd = VGeneral-Purpose Counters/TimersNumber of counter/timers2 Resolution32 bitsCounter measurementsEdge counting, pulse, semi-period, period,two-edge separationPosition measurementsX1, X2, X4 quadrature encoding withChannel Z reloading.

10 Two-pulse encodingOutput applicationsPulse, pulse train with dynamic updates,frequency division, equivalent time sampling10 | | ni 6221 (37-Pin) Device SpecificationsInternal base clocks80 MHz, 20 MHz, MHzExternal base clock frequency0 MHz to 20 MHzBase clock accuracy50 ppmInputsGate, Source, HW_Arm, Aux, A, B, Z,Up_DownRouting options for inputsAny PFI, RTSI, PXI_TRIG, PXI_STAR,analog trigger, many internal signalsRouting options for inputsAny PFI, RTSI, analog trigger, many internalsignalsFIFO2 samplesData transfersDedicated scatter-gather DMA controller foreach counter/timer; interrupts;programmed I/OFrequency GeneratorNumber of channels1 Base clocks10 MHz, 100 kHzDivisors1 to 16 Base clock accuracy50 ppmOutput can be available on any output PFI or RTSI Loop (PLL)Number of PLLs1 Reference signalRTSI < >Output of PLL80 MHz Timebase.