NI recommends high-speed M Series (NI 625x) for 5X faster sampling rates, high-accuracy M Series (NI 628x) for 4X higher resolution, or industrial M Series (NI 623x) for 60 VDC isolation and superior noise rejection 16, 32, or 80 analog inputs at 16 bits, 250 kS/s Up to 4 analog outputs at 16 bits, 833 kS/s (6 μs full-scale settling time) Programmable input range (±10, ±5, ±1, ±0.2 V) per channel	Up to 48 TTL/CMOS digital I/O lines (up to 32 hardware-timed at 1 MHz) Two 32-bit, 80 MHz counter/timers Digital triggering X1, X2, or X4 quadrature encoder inputs

Overview

NI M Series low-cost multifunction data acquisition (DAQ) devices provide optimized functionality for cost-sensitive applications. They have up to 80 analog inputs, 48 digital I/O lines, four analog outputs, two counter/timers, and digital triggering. Low-cost M Series devices have a one-year calibration interval. For better accuracy, faster speeds, and an extended two-year calibration service, consider high-speed and high-accuracy M Series devices.

Requirements and Compatibility

OS Information Windows 2000/XP Windows Vista x64/x86 Linux® Mac OS X

Driver Information NI-DAQmx Base NI-DAQmx

Software Compatibility ANSI C LabVIEW LabVIEW SignalExpress Visual Studio .NET Measurement Studio Visual Basic LabWindows/CVI

Comparison Tables

Family	Bus	Analog Inputs	Analog Input Resolution (bits)	Analog Outputs (AO)	AO Resolution (bits)	Max AO Rate (kS/S)	AO Range (V)	Digital I/O	Correlated (clocked) DIO
NI 6220	PCI, PXI	16	16	-	-	-	-	24	8, up to 1 MHz
NI 6221	PCI, PXI, USB	16	16	2	16	833	±10	24	8, up to 1 MHz
NI 6221 (37-pin)	PCI	16	16	2	16	833	±10	24	8, up to 1 MHz
NI 6224	PCI, PXI	32	16	-	-	-	-	48	32, up to 1 MHz
NI 6225	PCI, PXI, USB	80	16	2	16	833	±10	24	8, up to 1 MHz
NI 6229	PCI, PXI, USB	32	16	4	16	833	±10	48	32, up to 1 MHz

Application and Technology

M Series for Test

For test, you can use 16-bit, 250 kS/s analog inputs and 1 MHz digital lines with NI signal conditioning for applications including data logging and sensor measurements. Low-cost M Series devices are compatible with the NI SCC and SCXI signal conditioning platforms, which provide amplification, filtering, and power for virtually every type of sensor. These platforms also are compliant with IEEE 1451.4 smart transducer electronic data sheet (TEDS) sensors, which provide digital storage for sensor data sheet information.

M Series for Control

Low-cost M Series digital lines can drive 24 mA for relay and actuator control. With up to four analog outputs, two 80 MHz counter/timers, and six DMA channels, M Series devices can execute multiple control loops simultaneously. Low-cost M Series devices also have direct support for encoder measurements, protected digital lines, and digital debounce filters for control applications. With up to 80 analog inputs, 32 clocked digital lines at rates of 1 MHz, and four analog outputs, you can execute multiple control loops with a single device. For higher-count control loops, you can use M Series devices in conjunction and tightly synchronized with National Instruments analog output devices for 64 or more loops. 

M Series for Design

You can use the wide range of I/O – from 80 analog inputs to 48 digital lines – to measure and verify prototype designs. M Series devices and NI LabVIEW SignalExpress interactive measurement software deliver benchtop measurements to the PC. With LabVIEW SignalExpress interactive configuration-based steps, you can quickly create design verification tests. The fast acquisition and generation rates of low-cost M Series devices along with LabVIEW SignalExpress provide on-the-fly design analysis. You can convert your tested and verified LabVIEW SignalExpress projects to LabVIEW applications for immediate M Series DAQ use and bridge the gap between test, control, and design applications.

Hybrid-Slot-Compatible PXI Modules

PXI M Series modules are hybrid-slot-compatible so that you can use them in both PXI slots and the hybrid slots found in new PXI Express chassis. The PXI Systems Alliance specifies that hybrid-slot-compatible PXI modules use modified slot connectors to mechanically fit in both PXI slots and hybrid slots. This mechanical change: 

• Provides compatibility with past, current, and future PXI chassis
• Maintains existing product specifications
• Requires no software changes (application or driver)
• Maintains speed and capability of all PXI communication (PXI Express signaling is not provided)

However, hybrid-slot-compatible PXI modules do not include the pins used to implement PXI local bus communication, which is used for backplane SCXI control from the right-most PXI slot in PXI/SCXI combination chassis (NI PXI-1010, PXI-1011, PXI-1050, and PXI-1052). For these applications, NI provides unmodified PXI M Series modules that maintain the required local bus capabilities. Refer to the SCXI Control of PXI/SCXI Combination Chassis section in the Ordering Information section for part numbers.

Simultaneous and Intelligent Data Acquisition

When you need to obtain performance from a data acquisition device beyond the capabilities of a multifunction data acquisition device, National Instruments provides simultaneous sampling with NI S Series and intelligent data acquisition with NI R Series. The S Series architecture dedicates an analog-to-digital converter (ADC) per channel to provide higher aggregate sampling rates compared to multiplexed devices. S Series devices are ideal for applications including IF digitization, transient recording, ultrasound and sonar testing, and high-energy physics. R Series multifunction DAQ devices contain a field-programmable gate array (FPGA) that is reconfigurable using the LabVIEW FPGA Module. R Series multifunction devices combine analog input, analog output, and digital I/O on a single device. You can customize these devices to develop capabilities such as complete control over the synchronization and timing of all signals and operations; user-defined onboard decision-making logic; and digital lines individually configurable as input, output, counter/timers, pulse-width modulation (PWM), flexible encoder inputs, or user-defined communication protocols. 

Industrial M Series

When you need performance and accuracy from a data acquisition device in an electrically noisy or harsh environment, consider  industrial NI M Series devices. They offer a set of high-reliability features, including isolation, ±20 mA current I/O, 24 V digital logic levels, and digital debounce filters. Isolation prevents ground loops, rejects high common-mode voltages, and protects users and equipment from high-voltage transients. Four to 20 mA current loops are immune to most sources of electrical noise and voltage (IR) drops along extensive cable lengths. Sourcing or sinking 24 V digital I/O interfaces directly with pumps, valves, relays, and other industry-standard sensors and actuators; programmable debounce filters remove glitches and spikes from switches and relays connected to digital input lines.

Recommended Accessories

Signal conditioning is required for sensor measurements or voltage inputs greater than 10 V. NI SCXI is a versatile, high-performance signal conditioning platform optimized for high-channel-count applications. NI SCC provides portable, flexible signal conditioning options on a per-channel basis. Visit ni.com/sigcon for NI signal conditioning resources. The NI PCI-6221 (37-Pin) offers a 37-pin D-Sub connector that lowers connectivity costs by 80 percent. The D-Sub connector makes the PCI-6221 (37-Pin) ideal for OEM applications; however, its connector is not compatible with SCC or SCXI signal conditioning.

Recommended Driver Software

National Instruments measurement services software, built around NI-DAQmx driver software, includes intuitive application programming interfaces, configuration tools, I/O assistants, and other tools designed to reduce system setup, configuration, and development time. National Instruments recommends using the latest version of NI-DAQmx driver software for application development in NI LabVIEW and LabWindows^™/CVI, ANSI C/C++, C#, Visual Basic .NET, and Visual Basic 6.0. To download the most recent version of NI-DAQmx software, visit ni.com/support/daq/versions. Linux and Mac OS X users can program M Series devices with NI-DAQmx Base driver software. M Series devices are compatible with the following versions (or later) of NI application software – LabVIEW, LabWindows/CVI, or Measurement Studio versions 7.x; LabVIEW SignalExpress 1.x; VI Logger 2.0; or LabVIEW with the LabVIEW Real-Time Module 7.1. M Series devices are not compatible with the Traditional NI-DAQ (Legacy) driver.

NI measurement services software speeds up your development with features including the following:

• A guide to create fast and accurate measurements with no programming using the DAQ Assistant
• Automatic code generation to create your application in LabVIEW; LabWindows/CVI; LabVIEW SignalExpress; and C#, Visual Studio .NET, ANSI C/C++, or Visual Basic using Measurement Studio
• Multithreaded streaming technology for 1,000 times performance improvements
• Automatic timing, triggering, and synchronization routing to make advanced applications easy
• Thousands of free software downloads available at ni.com/zone to jump-start your project
• Software configuration of all digital I/O features without hardware switches/jumpers
• Single programming interface for analog input, analog output, digital I/O, and counters on hundreds of multifunction DAQ hardware devices 

M Series devices are compatible with the following versions (or later) of NI application software – LabVIEW, LabWindows/CVI, or Measurement Studio versions 7.x; and LabVIEW SignalExpress 2.x.

Ordering Information

For a complete list of accessories, visit the product page on ni.com.

Products	Part Number	Recommended Accessories	Part Number
NI PCI-6220
NI PCI-6220 Each NI PCI-6220 requires: 1 Cable, 1 Connector Block	779065-01	Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6220
NI PXI-6220 Each NI PXI-6220 requires: 1 Cable, 1 Connector Block	779112-01	Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PCI-6221
NI PCI-6221 Each NI PCI-6221 requires: 1 Cable, 1 Connector Block	779066-01	Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PCI-6224
NI PCI-6224 Each NI PCI-6224 requires: 2 Cables, 2 Connector Blocks	779067-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6224
NI PXI-6224 Each NI PXI-6224 requires: 2 Cables, 2 Connector Blocks	779114-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PCI-6225
NI PCI-6225 Each NI PCI-6225 requires: 2 Cables, 2 Connector Blocks	779295-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68 Cable (2m)       **Also available: Unshielded	191945-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6225
NI PXI-6225 Each NI PXI-6225 requires: 2 Cables, 2 Connector Blocks	779296-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68 Cable (2m)       **Also available: Unshielded	191945-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PCI-6229
NI PCI-6229 Each NI PCI-6229 requires: 2 Cables, 2 Connector Blocks	779068-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (1m)       **Also available: Unshielded	192061-01
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68-EPM Cable (1m)       **Also available: Unshielded	192061-01
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6229
NI PXI-6229 Each NI PXI-6229 requires: 2 Cables, 2 Connector Blocks	779630-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6229 for SCXI Control in PXI/SCXI Combination Chassis Each NI PXI-6229 for SCXI Control in PXI/SCXI Combination Chassis requires: 2 Cables, 2 Connector Blocks	779115-01	Connector 0:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
		Connector 1:
		Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6221
NI PXI-6221 Each NI PXI-6221 requires: 1 Cable, 1 Connector Block	779629-01	Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PXI-6221 for SCXI Control in PXI/SCXI Combination Chassis Each NI PXI-6221 for SCXI Control in PXI/SCXI Combination Chassis requires: 1 Cable, 1 Connector Block	779113-01	Cable: Shielded - SHC68-68-EPM Cable (2m)       **Also available: Unshielded	192061-02
		Connector Block: Screw Terminals - SCB-68       **Also available: BNC Termination	776844-01
NI PCI-6221 37-pin
NI PCI-6221 37-pin Each NI PCI-6221 37-pin requires: 1 Cable, 1 Connector Block	779418-01	Cable: Shielded - SH37F-37M Cable (2m)	778621-02
		Connector Block: Screw Terminals - CB-37FH	778673-01

Software Recommendations

NI LabVIEW Professional Development System for Windows	Easy-to-use graphical development environment Tight integration with a wide range of measurement hardware Rapid user interface development for displaying live data Extensive signal processing, analysis, and math functionality Source code control integration and code complexity metrics Support for Windows Vista/XP/2000	NI Measurement Studio Professional Edition	Base analysis and instrumentation components for Microsoft Visual Basic, Visual C#, and Visual C++ Cross-platform communication with network variables Scientific user interface controls Code-generating DAQ Assistant and Instrument I/O Assistant Acquire data from GPIB, serial, Ethernet, and plug-in data acquisition devices Requires Microsoft Visual Studio 2008/2005/.NET 2003 or Visual Studio 6.0
NI LabWindows™/CVI for Windows	Real-time advanced 2D graphs and charts with support for Windows Vista/XP/2000 Complete hardware compatibility with IVI, VISA, DAQ, GPIB, and serial Analysis tools for array manipulation, signal processing statistics, and curve fitting Simplified cross-platform communication with network variables Measurement Studio .NET tools (included in LabWindows/CVI Full only) The mark LabWindows is used under a license from Microsoft Corporation.	NI LabVIEW SignalExpress for Windows	Quickly configure projects without programming Control over 400 PC-based and stand-alone instruments Log data from more than 250 data acquisition devices Perform basic signal processing, analysis, and file I/O Scale your application with automatic LabVIEW code generation Create custom reports or easily export data to LabVIEW, DIAdem or Microsoft Excel

Support and Services

System Assurance Programs

NI system assurance programs are designed to make it even easier for you to own an NI system. These programs include configuration and deployment services for your NI PXI, CompactRIO, or Compact FieldPoint system. The NI Basic System Assurance Program provides a simple integration test and ensures that your system is delivered completely assembled in one box. When you configure your system with the NI Standard System Assurance Program, you can select from available NI system driver sets and application development environments to create customized, reorderable software configurations. Your system arrives fully assembled and tested in one box with your software preinstalled. When you order your system with the standard program, you also receive system-specific documentation including a bill of materials, an integration test report, a recommended maintenance plan, and frequently asked question documents. Finally, the standard program reduces the total cost of owning an NI system by providing three years of warranty coverage and calibration service. Use the online product advisors at ni.com/advisor to find a system assurance program to meet your needs.

Calibration

NI measurement hardware is calibrated to ensure measurement accuracy and verify that the device meets its published specifications. To ensure the ongoing accuracy of your measurement hardware, NI offers basic or detailed recalibration service that provides ongoing ISO 9001 audit compliance and confidence in your measurements. To learn more about NI calibration services or to locate a qualified service center near you, contact your local sales office or visit ni.com/calibration.

Technical Support

Get answers to your technical questions using the following National Instruments resources.

• Support - Visit ni.com/support to access the NI KnowledgeBase, example programs, and tutorials or to contact our applications engineers who are located in NI sales offices around the world and speak the local language.
• Discussion Forums - Visit forums.ni.com for a diverse set of discussion boards on topics you care about.
• Online Community - Visit community.ni.com to find, contribute, or collaborate on customer-contributed technical content with users like you.

Repair

While you may never need your hardware repaired, NI understands that unexpected events may lead to necessary repairs. NI offers repair services performed by highly trained technicians who quickly return your device with the guarantee that it will perform to factory specifications. For more information, visit ni.com/repair.

Training and Certifications

The NI training and certification program delivers the fastest, most certain route to increased proficiency and productivity using NI software and hardware. Training builds the skills to more efficiently develop robust, maintainable applications, while certification validates your knowledge and ability.

• Classroom training in cities worldwide - the most comprehensive hands-on training taught by engineers.
• On-site training at your facility - an excellent option to train multiple employees at the same time.
• Online instructor-led training - lower-cost, remote training if classroom or on-site courses are not possible.
• Course kits - lowest-cost, self-paced training that you can use as reference guides.
• Training memberships and training credits - to buy now and schedule training later.

Visit ni.com/training for more information.

Extended Warranty

NI offers options for extending the standard product warranty to meet the life-cycle requirements of your project. In addition, because NI understands that your requirements may change, the extended warranty is flexible in length and easily renewed. For more information, visit ni.com/warranty.

OEM

NI offers design-in consulting and product integration assistance if you need NI products for OEM applications. For information about special pricing and services for OEM customers, visit ni.com/oem.

Alliance

Our Professional Services Team is comprised of NI applications engineers, NI Consulting Services, and a worldwide National Instruments Alliance Partner program of more than 600 independent consultants and integrators. Services range from start-up assistance to turnkey system integration. Visit ni.com/alliance.

Detailed Specifications

Specifications listed below are typical at 25 °C unless otherwise noted. Refer to the M Series User Manual for more information about NI 622x devices.

Analog Input
Number of channels
NI 6220/6221		8 differential or 16 single ended
NI 6224/6229		16 differential or 32 single ended
NI 6225		40 differential or 80 single ended
ADC resolution		16 bits
DNL		No missing codes guaranteed
INL		Refer to the AI Absolute Accuracy Table
Sampling rate
Maximum		250 kS/s single channel, 250 kS/s multi-channel (aggregate)
Minimum		No minimum
Timing accuracy		50 ppm of sample rate
Timing resolution		50 ns
Input coupling		DC
Input range		±10 V, ±5 V, ±1 V, ±0.2 V
Maximum working voltage for analog inputs (signal + common mode)		±11 V of AI GND
CMRR (DC to 60 Hz)		92 dB
Input impedance
Device on
AI+ to AI GND		>10 GΩ in parallel with 100 pF
AI- to AI GND		>10 GΩ in parallel with 100 pF
Device off
AI+ to AI GND		820 Ω
AI- to AI GND		820 Ω
Input bias current		±100 pA
Crosstalk (at 100 kHz)
Adjacent channels		-75 dB
Non-adjacent channels		-90 dB1
Small signal bandwidth (-3 dB)		700 kHz
Input FIFO size		4,095 samples
Scan list memory		4,095 entries
Data transfers
PCI/PXI devices		DMA (scatter-gather), interrupts, programmed I/O
USB devices		USB Signal Stream, programmed I/O
Overvoltage protection (AI <0..79>, AI SENSE, AI SENSE 2)
Device on		±25 V for up to two AI pins
Device off		±15 V for up to two AI pins
Input current during overvoltage condition		±20 mA max/AI pin
1 For USB-6225 devices, channel AI <0..15> crosstalk to channel AI <64..79> is -71 dB; applies to channels with 64-channel separation, for example, AI (x) and AI (x + 64).
Settling Time for Multichannel Measurements
Accuracy, full scale step, all ranges
±90 ppm of step (±6 LSB)		4 μs convert interval
±30 ppm of step (±2 LSB)		5 μs convert interval
±15 ppm of step (±1 LSB)		7 μs convert interval

                                                                      

Typical Performance Graphs

                                                                      

Analog Output
Number of channels
NI 6220/6224		0
NI 6221/6225		2
NI 6229		4
DAC resolution		16 bits
DNL		±1 LSB
Monotonicity		16 bit guaranteed
Maximum update rate
1 channel		833 kS/s
2 channels		740 kS/s per channel
3 channels		666 kS/s per channel
4 channels		625 kS/s per channel
Timing accuracy		50 ppm of sample rate
Timing resolution		50 ns
Output range		±10 V
Output coupling		DC
Output impedance		0.2 Ω
Output current drive		±5 mA
Overdrive protection		±25 V
Overdrive current		10 mA
Power-on state		±20 mV2
Power-on glitch		400 mV for 200 ms
Output FIFO size		8,191 samples shared among channels used
Data transfers
PCI/PXI devices		DMA (scatter-gather), interrupts, programmed I/O
USB devices		USB Signal Stream, programmed I/O
AO waveform modes: Non-periodic waveform Periodic waveform regeneration mode from onboard FIFO Periodic waveform regeneration from host buffer including dynamic update
Settling time, full scale step 15 ppm (1 LSB)		6 μs
Slew rate		15 V/μs
Glitch energy
Magnitude		100 mV
Duration		2.6 μs
2 For all USB-6221/6229 Screw Terminal devices, when powered on, the analog output signal is not defined until after USB configuration is complete.
Calibration (AI and AO)
Recommended warm-up time		15 minutes
Calibration interval		1 year

                                                                      

AI Absolute Accuracy Table
Nominal Range		Residual Gain Error (ppm of Reading)	Gain Tempco (ppm/°C)	Reference Tempco	Residual Offset Error (ppm of Range)	Offset Tempco (ppm of Range/°C)	INL Error (ppm of Range)	Random Noise, σ (µVrms)	Absolute Accuracy at Full Scale1 (µV)	Sensitivity2 (µV)
Positive Full Scale	Negative Full Scale
10	-10	75	25	5	20	57	76	244	3,100	97.6
5	-5	85	25	5	20	60	76	122	1,620	48.8
1	-1	95	25	5	25	79	76	30	360	12.0
0.2	-0.2	135	25	5	80	175	76	13	112	5.2
AbsoluteAccuracy = Reading · (GainError) + Range · (OffsetError) + NoiseUncertainty GainError = ResidualAIGainError + GainTempco · (TempChangeFromLastInternalCal) + ReferenceTempco · (TempChangeFromLastExternalCal) OffsetError = ResidualAIOffsetError + OffsetTempco · (TempChangeFromLastInternalCal) + INL_Error 1 Absolute accuracy at full scale on the analog input channels is determined using the following assumptions: TempChangeFromLastExternalCal = 10 °C TempChangeFromLastInternalCal = 1 °C number_of_readings = 100 CoverageFactor = 3 σ For example, on the 10 V range, the absolute accuracy at full scale is as follows: GainError = 75 ppm + 25 ppm · 1 + 5 ppm · 10     GainError = 150 ppm OffsetError = 20 ppm + 57 ppm · 1 + 76 ppm       OffsetError = 153 ppm AbsoluteAccuracy = 10 V · (GainError) + 10 V · (OffsetError) + NoiseUncertainty AbsoluteAccuracy = 3,100 μV 2 Sensitivity is the smallest voltage change that can be detected. It is a function of noise. Accuracies listed are valid for up to one year from the device external calibration.

 

AO Absolute Accuracy Table
Nominal Range		Residual Gain Error (ppm of Reading)	Gain Tempco (ppm/°C)	Reference Tempco	Residual Offset Error (ppm of Range)	Offset Tempco (ppm of Range/°C)	INL Error (ppm of Range)	Absolute Accuracy at Full Scale1 (µV)
Positive Full Scale	Negative Full Scale
10	-10	90	10	5	40	5	128	3,230
1 Absolute Accuracy at full scale numbers is valid immediately following internal calibration and assumes the device is operating within 10 °C of the last external calibration. Accuracies listed are valid for up to one year from the device external calibration. AbsoluteAccuracy = OutputValue · (GainError) + Range · (OffsetError) GainError = ResidualGainError + GainTempco · (TempChangeFromLastInternalCal) + ReferenceTempco · (TempChangeFromLastExternalCal) OffsetError = ResidualOffsetError + AOOffsetTempco · (TempChangeFromLastInternalCal) + INL_Error

 

Digital I/O/PFI
Static Characteristics
Number of channels
NI 6220/6221 (68-pin)/6225		24 total 8 (P0.<0..7>) 16 (PFI <0..7>/P1, PFI <8..15>/P2)
PCI-6221 (37-pin)		10 total 2 (P0.<0, 1>) 8 (PFI <0..7>/P1)
NI 6224/6229		48 total 32 (P0.<0..31>) 16 (PFI <0..7>/P1, PFI <8..15>/P2)
Ground reference		D GND
Direction control		Each terminal individually programmable as input or output
Pull-down resistor		50 kΩ typical, 20 kΩ minimum
Input voltage protection3		±20 V on up to two pins
3 Stresses beyond those listed under Input voltage protection may cause permanent damage to the device.
Waveform Characteristics (Port 0 Only)
Terminals used
NI 6220/6221 (68-pin)/6225		Port 0 (P0.<0..7>)
PCI-6221 (37-pin)		Port 0 (P0.<0, 1>)
NI 6224/6229		Port 0 (P0.<0..31>)
Port/sample size
NI 6220/6221 (68-pin)/6225		Up to 8 bits
PCI-6221 (37-pin)		Up to 2 bits
NI 6224/6229		Up to 32 bits
Waveform generation (DO) FIFO		2,047 samples
Waveform acquisition (DI) FIFO		2,047 samples
DI or DO Sample Clock frequency4		0 to 1 MHz
Data transfers
PCI/PXI devices		DMA (scatter-gather), interrupts, programmed I/O
USB devices		USB Signal Stream, programmed I/O
DO or DI Sample Clock source5		Any PFI, RTSI, AI Sample or Convert Clock, AO Sample Clock, Ctr n Internal Output, and many other signals
4 Performance can be dependent on bus latency and volume of bus activity. 5 The digital subsystem does not have its own dedicated internal timing engine. Therefore, a sample clock must be provided from another subsystem on the device or an external source.
PFI/Port 1/Port 2 Functionality6
Functionality		Static digital input, static digital output, timing input, timing output
Timing output sources		Many AI, AO, counter, DI, DO timing signals
Debounce filter settings		125 ns, 6.425 µs, 2.56 ms, disable; high and low transitions; selectable per input
6 Port 2 is not available on PCI-6221 (37-pin) devices.

 

Recommended Operation Conditions, PCI/PXI Devices
Level	Min	Max
Input high voltage (VIH)	2.2 V	5.25 V
Input low voltage (VIL)	0 V	0.8 V
Output high current (IOH)    P0.<0..31>    PFI <0..15>/P1/P2	— —	-24 mA -16 mA
Output low current (IOL)    P0.<0..31>    PFI <0..15>/P1/P2	— —	24 mA 16 mA

 

Recommended Operation Conditions, USB Devices
Level	Min	Max
Input high voltage (VIH)	2.2 V	5.25 V
Input low voltage (VIL)	0 V	0.8 V
Output high current (IOH)    P0.<0..15>    P0.<16..31>    PFI <0..15>/P1/P2	— — —	-24 mA -16 mA -16 mA
Output low current (IOL)    P0.<0..15>    P0.<16..31>    PFI <0..15>/P1/P2	— — —	24 mA 16 mA 16 mA

 

Electrical Characteristics
Level	Min	Max
Positive-going threshold (VT+) Negative-going threshold (VT-)	— 0.8 V	2.2 V —
Delta VT hysteresis (VT+ - VT-)	0.2 V	—
IIL input low current (Vin = 0 V) IIH input high current (Vin = 5 V)	— —	-10 µA 250 µA

 

Digital I/O Characteristics6

                                                                      

General-Purpose Counter/Timers
Number of counter/timers		2
Resolution		32 bits
Counter measurements		Edge counting, pulse, semi-period, period, two-edge separation
Position measurements		X1, X2, X4 quadrature encoding with Channel Z reloading; two-pulse encoding
Output applications		Pulse, pulse train with dynamic updates, frequency division, equivalent time sampling
Internal base clocks		80 MHz, 20 MHz, 0.1 MHz
External base clock frequency		0 MHz to 20 MHz
Base clock accuracy		50 ppm
Inputs		Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down
Routing options for inputs		Any PFI, RTSI, PXI_TRIG, PXI_STAR, analog trigger, many internal signals
FIFO		2 samples
Data transfers
PCI/PCIe/PXI/PXIe devices		Dedicated scatter-gather DMA controller for each counter/timer; interrupts, programmed I/O
USB devices		USB Signal Stream, programmed I/O
Frequency Generator
Number of channels		1
Base clocks		10 MHz, 100 kHz
Divisors		1 to 16
Base clock accuracy		50 ppm
Output can be available on any PFI or RTSI terminal.
Phase-Locked Loop (PLL)
Number of PLLs		1
Reference signal		PXI_STAR, PXI_CLK10, RTSI <0..7>
Output of PLL		80 MHz Timebase; other signals derived from 80 MHz Timebase including 20 MHz and 100 kHz Timebases
External Digital Triggers
Source		Any PFI, RTSI, PXI_TRIG, PXI_STAR
Polarity		Software-selectable for most signals
Analog input function		Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Convert Clock, Sample Clock Timebase
Analog output function		Start Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase
Counter/timer functions		Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down
Digital waveform generation (DO) function		Sample Clock
Digital waveform acquisition (DI) function		Sample Clock
Device-To-Device Trigger Bus
PCI/PCIe devices		RTSI <0..7>7
PXI/PXIe devices		PXI_TRIG <0..7>, PXI_STAR
USB devices		None
Output selections		10 MHz Clock; frequency generator output; many internal signals
Debounce filter settings		125 ns, 6.425 µs, 2.56 ms, disable; high and low transitions; selectable per input
7 In other sections of this document, RTSI refers to RTSI <0..7> for PCI devices or PXI_TRIG <0..7> for PXI devices.
Bus Interface
PCI/PXI devices		3.3 V or 5 V signal environment
USB devices		USB 2.0 Hi-Speed or full-speed8
DMA channels (PCI/PXI devices)		6, analog input, analog output, digital input, digital output, counter/timer 0, counter/timer 1
USB Signal Stream (USB devices)		4, can be used for analog input, analog output, digital input, digital output, counter/timer 0, counter/timer 1
All PXI-625x devices support one of the following features: May be installed in PXI Express hybrid slots Or, may be used to control SCXI in PXI/SCXI combo chassis
8 If you are using a USB M Series device in full-speed mode, device performance will be lower and you will not be able to achieve maximum sampling/update rates.
Table 1. PXI/SCXI Combo and PXI Express Chassis Compatibility M Series Device M Series Part Number SCXI Control in PXI/SCXI Combo Chassis PXI Express Hybrid Slot Compatible PXI-6220 191332B-04 No Yes PXI-6221 191332B-03 No Yes 191332B-13 Yes No PXI-6224 191332B-02 No Yes PXI-6225 192227A-01 No Yes PXI-6229 191332B-01 No Yes 191332B-11 Yes No Earlier versions of PXI-6220/6221/6224/6229 191332A-0x Yes No
Power Requirements
Current draw from bus during no-load condition9
PCI/PXI devices
+5 V		0.02 A10
+3.3 V		0.25 A10
+12 V		0.15 A
Current draw from bus during AI and AO overvoltage condition9
PCI/PXI devices
+5 V		0.02 A10
+3.3 V		0.25 A10
+12 V		0.25 A

Caution USB-622x devices must be powered with NI offered AC adapter or a National Electric Code (NEC) Class 2 DC source that meets the power requirements
for the device and has appropriate safety certification marks for country of use.

USB power supply requirements		11 to 30 VDC, 20 W, locking or non-locking power jack with 0.080" diameter center pin, 5/16-32 thread for locking collars
9 Does not include P0/PFI/P1/P2 and +5 V terminals. 10 PCI-6221 (37-pin) devices do not use +3.3 V from the bus. The 3.3 V current draw, shown in the Power Requirements section, comes from the +5 V instead.
Power Limits
Caution  Exceeding the power limits may cause unpredictable behavior by the device and/or PC/chassis.
PCI devices
+5 V terminal (connector 0)		1 A max11
+5 V terminal (connector 1)		1 A max11
PXI devices
+5 V terminal (connector 0)		1 A max11
+5 V terminal (connector 1)		1 A max11
P0/PFI/P1/P2 and +5 V terminals combined		2 A max
USB devices
+5 V terminal		1 A max11
P0/PFI/P1/P2 and +5 V terminals combined		2 A max
Power supply fuse		2 A, 250 V
11 Has a self-resetting fuse that opens when current exceeds this specification.
Physical Requirements
Printed circuit board dimensions
PCI-6220/6221/6224/6225/6229		9.7 x 15.5 cm (3.8 x 6.1 in.)
PXI-6220/6221/6224/6225/6229		Standard 3U PXI
Enclosure dimensions (includes connectors)
USB-6221/6225/6229 Screw Terminal		26.67 x 17.09 x 4.45 cm (10.5 x 6.73 x 1.75 in.)
USB-6221/6229 BNC		28.6 x 17 x 6.9 cm (11.25 x 6.7 x 2.7 in.)
USB-6225 Mass Termination		18.8 x 17.09 x 4.45 cm (7.4 x 6.73 x 1.75 in.)
USB-6221/6225/6229 OEM		Refer to the NI USB-622x/625x OEM User Guide
Weight
PCI-6220		91 g (3.2 oz)
PCI-6221 (68-pin)		92 g (3.2 oz)
PCI-6221 (37-pin)		95 g (3.3 oz)
PCI-6224		99 g (3.5 oz)
PCI-6225		103 g (3.6 oz)
PCI-6229		101 g (3.5 oz)
PXI-6220		158 g (5.5 oz)
PXI-6221		162 g (5.7 oz)
PXI-6224		170 g (5.9 oz)
PXI-6225		174 g (6.1 oz)
PXI-6229		171 g (6.0 oz)
USB-6221 Screw Terminal		1.2 kg (2 lb 10 oz)
USB-6225/6229 Screw Terminal		1.24 kg (2 lb 11 oz)
USB-6225 Mass Termination		907 g (2 lb)
USB-6221 OEM		131 g (4.6 oz)
USB-6225/6229 OEM		162 g (5.7 oz)
I/O connector
PCI/PXI-6220/6221 (68-pin)		1 68-pin VHDCI
PCI/PXI-6224/6225/6229		2 68-pin VHDCI
PCI-6221 (37-pin)		1 37-pin D-SUB
USB-6221 Screw Terminal		64 screw terminals
USB-6225/6229 Screw Terminal		128 screw terminals
USB-6221 BNC		21 BNCs and 30 screw terminals
USB-6229 BNC		32 BNCs and 60 screw terminals
USB-6225 Mass Termination		2 68-pin SCSI
USB-6221/6225/6229 Screw Terminal/ USB-6221/6229 BNC screw terminal wiring		16-28 AWG
Maximum Working Voltage12
NI 6220/6221/6224/6225/6229 channel-to-earth		11 V, Measurement Category I
Caution  Do not use for measurements within Categories II, III, or IV.
12 Maximum working voltage refers to the signal voltage plus the common-mode voltage.
Environmental
Operating temperature
PCI/PXI devices		0 to 55 °C
USB devices		0 to 45 °C
Storage temperature		-20 to 70 °C
Humidity		10 to 90% RH, noncondensing
Maximum altitude		2,000 m
Pollution Degree (indoor use only)		2
Shock and Vibration (PXI Devices Only)
Operational shock		30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC-60068-2-27. Test profile developed in accordance with MIL-PRF-28800F.)
Random vibration
Operating		5 to 500 Hz, 0.3 grms
Nonoperating		5 to 500 Hz, 2.4 grms (Tested in accordance with IEC-60068-2-64. Nonoperating test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

 

Safety

This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use:

IEC 61010-1, EN 61010-1 UL 61010-1, CSA 61010-1

Note For UL and other safety certifications, refer to the product label or visit ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.

Electromagnetic Compatibility

This product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement, control, and laboratory use:

EN 61326 EMC requirements; Minimum Immunity EN 55011 Emissions; Group 1, Class A CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A

Note For EMC compliance, operate this device with shielded cables.

CE Compliance

This product meets the essential requirements of applicable European Directives, as amended for CE marking, as follows:

73/23/EEC; Low-Voltage Directive (safety) 89/336/EEC; Electromagnetic Compatibility Directive (EMC)

Note Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visit ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.

Environmental Management

National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the environment but also to NI customers. For additional environmental information, refer to the NI and the Environment Web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

Waste Electrical and Electronic Equipment (WEEE)

At the end of their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit ni.com/environment/weee.htm.

 

Pinouts/Front Panel Connections

PCI/PXI-6220 Pinout

PCI/PXI-6221 (68-Pin) Pinout

PCI-6221 (37-Pin) Pinout

PCI/PXI-6224 Pinout

PCI/PXI-6225 Pinout

PCI/PXI-6229 Pinout