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Last Revised: 2013-03-19 09:30:00.0
250 MS/s, 14-Bit Digitizer Adapter Module for NI FlexRIO
NI 5761
250 MS/s sample rate at 14-bit resolution
4 channels, simultaneously sampled
AC- and DC-coupled versions
Requires an NI FlexRIO FPGA module
Requires programming with LabVIEW FPGA or HDL
Overview
The NI 5761 adapter module for NI FlexRIO is a broadband high-performance digitizer designed to meet a wide range of signal processing application needs. The module
features four analog input channels with 14-bit resolution. With an analog bandwidth of 500 MHz and a sample rate of 250 MS/s, the NI 5761 is ideal for undersampling IF
communications signals up to the 4th Nyquist zone. Eight built-in digital I/O lines are suitable for a variety of applications, from implementing custom triggering to control of system
upconverters or downconverters.
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Application and Technology
The NI 5761 digitizer adapter module for NI FlexRIO uses the Texas Instruments ADS62P49 analog-to-digital converter (ADC), offering excellent 14-bit dynamic performance
Coupled with an NI FlexRIO field-programmable gate array (FPGA) module, the NI 5761 provides a powerful solution for applications requiring a high-speed digitizer with
excellent 14-bit dynamic performance and a user-accessible FPGA for custom real-time processing.
Application
Custom communications receivers
IF acquisition at the common frequencies of 10.7 MHz, 70
MHz, and 140 MHz, and band-limited direct RF acquisition
Phase-coherent MIMO acquisition
Signals intelligence
High-resolution time domain measurements
Example Algorithms
Custom modulation and demodulation, bit error rate test,
fading profiles, additive noise
Digital downconversion, demodulation, packet assembly
Algorithm prototyping, cross-correlation
FFT operations, digital downconversion, channelization,
triggering, cross-correlation
Custom data triggers, hysteresis, time in region, timing and
voltage measurements
Table 2.
Key Typical Specifications for the NI 5761
About NI FlexRIO
The NI FlexRIO family consists of PXI and PXI Express FPGA modules coupled to I/O adapter modules. Programmed with the NI LabVIEW FPGA Module, these modules
together provide high-performance I/O and user-defined hardware processing on the PXI platform.
Figure 3.
NI FlexRIO Architecture
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NI FlexRIO FPGA modules feature the latest in FPGA technology and high-performance bus interfaces.
Table 3.
NI FlexRIO FPGA Module Options
PXI Express NI FlexRIO FPGA modules incorporate Xilinx Virtex-5 SXT FPGAs with up to 512 MB of onboard DRAM, which you can access at bandwidths up to 3.2 GB/s. In
addition to general-purpose reconfigurable logic, SXT FPGAs are optimized for high-speed digital signal processing (DSP), with up to 640 DSP slices for single-cycle multiplication
and filtering functions. PXI Express NI FlexRIO FPGA modules also feature the NI STC-3 application-specific integrated circuit (ASIC), providing an optimized, high-bandwidth PCI
Express x4 communications link to the backplane of the PXI Express chassis. This ASIC reduces the FPGA resources needed to implement host communication and enables new
data transfer technology in the unique peer-to-peer (P2P) streaming feature. With NI P2P data streaming technology, you can continuously transfer data to and from PXI Express
NI FlexRIO FPGA modules at rates greater than 800 MB/s for additional processing and I/O integration. You can also stream to and from select PXI Express NI modular
instruments for an even greater variety of I/O.
PXI NI FlexRIO FPGA modules feature Xilinx Virtex-5 LX FPGAs with up to 128 MB of onboard DRAM, which you can access at bandwidths up to 1.6 GB/s. They feature all the
benefits of the PXI platform including synchronization, triggering, and high-speed data transfer to and from their hosts.
Table 4.
PXI and PXI Express FPGA Module Comparison
National Instruments and third parties offer NI FlexRIO adapter modules, and you can build your own adapter modules using the NI FlexRIO Adapter Module Development Kit
(MDK). With custom adapter modules, you can implement the exact analog and digital I/O your application requires, along with graphical FPGA programming provided by
LabVIEW. View a current list of NI and third-party adapter modules at
ni.com/flexrio
. This ability to easily create high-bandwidth P2P data streams helps provide scalable signal
processing and I/O integration.
LabVIEW FPGA
With the high-level graphical programming capabilities of LabVIEW FPGA, programming for the NI 5761 is far simpler than low-level HDL programming. Figure 4 depicts acquiring
samples from a digitizer adapter module at its configured rate and placing the data into an FPGA FIFO.
Figure 4.
LabVIEW FPGA Code for Acquiring Data from an NI FlexRIO Digitizer Adapter Module
From this point, you may implement your own processing, filtering, fast Fourier transform (FFT), or control. Figure 5 shows custom demodulation using IP from the FPGA RF
Communications Library on
ni.com/labs
.
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Figure 5.
LabVIEW FPGA Code for Demodulating and Decoding I and Q Signals after 4X Decimation
For implementing a real-time spectrum analyzer, Figure 6 shows code that performs windowing, conversion to the frequency domain, comparison against a frequency mask, and
assertion of a trigger when that mask is exceeded.
Figure 6.
LabVIEW FPGA Code for Real-Time Spectrum Analyzer
Finally, Figure 7 shows a custom, 128-tap inline finite impulse response (FIR) filter with reloadable coefficients. After filtering, the data is generated through a digital-to-analog
converter.
Figure 7.
LabVIEW FPGA Code for an Inline Filter
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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.
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.
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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
700 independent consultants and integrators. Services range from start-up assistance to turnkey system integration. Visit ni.com/alliance.
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Detailed Specifications
This section lists the specifications of the NI FlexRIO adapter module (NI 5761). Pair these specifications with the specifications listed in the
NI FlexRIO FPGA Module
Installation Guide and Specifications
. For more information about safety and electromagnetic compatibility refer to the
Read Me First: Safety and Electromagnetic Compatibility
document included in your hardware kit or available at
ni.com/manuals
.
Caution
To avoid permanent damage to the NI 5761, disconnect all signals connected to the NI 5761 before powering down the module, and only connect signals after
the module has been powered on by the NI FlexRIO FPGA module.
Note
All numeric specifications are typical unless otherwise noted. All graphs illustrate the performance of a representative module.
Typical
values describe useful product performance that are not covered by warranty. Typical values cover the expected performance of units over ambient temperature ranges
of 23 ±5 °C with a 90% confidence level, based on measurements taken during development or production.
Analog Input (AI CH 0 through AI CH 3)
General Characteristics
Number of channels
Connector
Input impedance
Sample rate
Internal Sample clock
External Sample clock
Digital data range
ADC part number
AC-Coupled Specifications
Input range (normal operating conditions)
Absolute maximum input
Bandwidth (–3 dB)
Bandwidth (–1 dB)
2.07 V
pk-pk
±10 V DC, 5 V
pk-pk
AC
0.1 MHz to 500 MHz
1 MHz to 250 MHz
250 MHz
175 MHz to 250 MHz
±8,191
ADS62P49
1
; 14-bit resolution, dual ADC
Four, single-ended, simultaneously sampled
SMA
50 Ω, per connector
The following table lists the AC-coupled spectral performance measurements. All values are measured with a 250 MHz external Sample clock.
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