100 MHz, 100 MS/s, 14-Bit Digitizer
SMC (Synchronization and Memory Core)
14-Bit
ADC
100/40/20 MHz
Filter Stage
Gain and
Offset Control
50 Ω
CH 0
CH 1
Onboard Memory
(8 to 512 MB)
AC/DC
Coupling
NI-MITE
(PCI Bus
Interface)
-1 MΩ
-1 MΩ
Onboard Memory
(8 to 512 MB)
14-Bit
ADC
100/40/20 MHz
Filter Stage
Gain and
Offset Control
50 Ω
AC/DC
Coupling
Timing and
Synchronization
Engine
AC/DC
Coupling
Trigger and
Event Control
EXT TRIG
Clk OUT
Clk IN
AUX
Routing Matrix
Figure 2. Hardware Block Diagram
directly from the device under test. Synchronize multiple instruments
using the PXI backplane 10 MHz reference clock or an external reference
ranging from 1 to 20 MHz in 1 MHz increments. Because an NI 5122 is
built on the SMC architecture, you can synchronize two or more digitizers
for high-channel-count applications and build mixed-signal test systems
using NI PXI-5421 arbitrary waveform generators and NI PXI-655x digital
waveform generator/analyzers.
Data Streaming up to 400 MB/s
Because of the PCI and PCI Express buses used in PXI, an NI 5122 can
continuously stream data to the host computer at rates up to 110 MB/s
using PCI/PXI or 400 MB/s using PXI Express. At 400 MB/s, an NI 5122
is streaming data on both channels at its maximum data rate. The
dedicated per-slot bandwidth available in PXI Express enables multi-
module systems to achieve higher aggregate data rates. High-speed
data record and playback applications are possible using the host
computer’s memory or high-end storage solutions such as RAID. Using an
8 x 500 GB drive RAID system with a capacity of 4 TB, you can capture
data at 400 MB/s for more than 2.5 hours. Areas that benefit from this
capability include RF/IF data streaming in signal intelligence, data
record and playback, and scientific applications.
Software
Every National Instruments high-speed digitizer comes with the
IVI-compliant NI-SCOPE driver, which is fully compatible with NI LabVIEW,
LabWindows/CVI, and Measurement Studio for Visual Studio 6.0 and
.NET. NI-SCOPE includes more than 50 built-in measurement and
analysis functions and an interactive SCOPE Soft Front Panel. The
NI Spectral Measurements Toolkit gives you sophisticated frequency-
domain measurements, such as power in-band, multiple peak search,
and 3D spectrogram, for applications in communications, signal
intelligence, and avionics.
Triggering
NI 5122 digitizers have three trigger sources – analog, digital, and
software control. Compare the input signal on either channel or the
external trigger channel to one or two thresholds for edge, hysteresis,
or window trigger detection. You can also use line-selectable video
triggering for NTSC, PAL, or SECAM broadcast standards. Drive and
receive digital triggers to and from the PXI trigger bus or the external
9-pin AUX connector. You can specify the number of samples to acquire
before and after a trigger event occurs. These pretrigger and posttrigger
settings also apply when the module is used in multiple-record mode.
Timing and Synchronization
An advanced 100 MHz clock generator produces the low-jitter, low-phase-
skew clock for the precise clocking and stable synchronization necessary
for high-speed, high-resolution digitizers. You can also use an external
clock source, such as the NI PXI-5404 100 MHz frequency generator, for
applications that require very specific sample frequencies or you can clock
Figure 3. Spectral Measurements Toolkit 3D Spectrogram
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)
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