NI 6225 Device Specifications - National Instruments

1 Device SPECIFICATIONSNI 6225M Series Data Acquisition: 16 Bit, 250 kS/s, 80 AI, 2 AO, 24 DIOThe following Specifications are typical at 25 C, unless otherwise noted. For moreinformation about the NI 6225, refer to the M Series User Manual available at InputNumber of channels40 differential or 80 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 dB1 Small signal bandwidth (-3 dB)700 kHzInput FIFO size4,095 samplesScan list memory4,095 entriesData transfersPCI/PXIDMA (scatter-gather), interrupts,programmed I/OUSBUSB Signal Stream, 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 interval1 Channel AI < > crosstalk to channel AI < > is -71 dB.

3 This applies to channels with64-channel separation. Example: AI (x) and AI (x + 64).2 | | NI 6225 Device SpecificationsTypical Performance GraphsFigure 1. 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 6225 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 6225 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 6225 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 transfersData transfersDMA (scatter-gather)

6 , interrupts,programmed I/OUSBUSB Signal Stream, 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 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 | | NI 6225 Device SpecificationsTable 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 rangeAO 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 channels24 total, 8 (P0.< >),16 (PFI < >/P1, PFI < >/P2)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 pins2 Waveform Characteristics (Port 0 Only)Terminals usedPort 0 (P0.< >)Port/sample sizeUp to 8 bitsWaveform generation (DO) FIFO2,047 samplesWaveform acquisition (DI) FIFO2,047 samples2 Stresses beyond those listed under Input voltage protection may cause permanent damage to 6225 Device Specifications | National Instruments | 7DI or DO Sample Clock frequency0 MHz to 1 MHz, system and bus activitydependentData transfersDMA (scatter-gather)

8 , interrupts,programmed I/ODI or DO Sample Clock source3 Any PFI, RTSI, AI Sample or Convert Clock,Ctr n Internal Output, and many other signalsPFI/Port 1/Port 2 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.< > -24 mAOutput high current (IOH) PFI < >/P1/P2 -16 mAOutput low current (IOL) P0.< > 24 mAOutput low current (IOL) PFI < >/P1/P2 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 A3 The digital subsystem does not have its own dedicated internal timing engine.

9 Therefore, a sampleclock must be provided from another subsystem on the Device or an external | | NI 6225 Device SpecificationsDigital I/O CharacteristicsFigure 4. DIO Port 0: 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. DIO PFI/Port 1/Port 2: 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 6225 Device Specifications | National Instruments | 9 Figure 6. DIO Port 0: Iol versus (V)Iol (mA)55 C; Vdd = V25 C; Vdd = V0 C; Vdd = VFigure 7. DIO PFI/Port 1/Port 2: 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 6225 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 signalsFIFO2 samplesData transfersPCI/PXID edicated scatter-gather DMA controller foreach counter/timer; interrupts, programmed I/OUSBUSB Signal Stream, 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)Note PCI/PXI devices of PLLs1 Reference signalPXI_STAR, PXI_CLK10, RTSI < >Output of PLL80 MHz Timebase.