NI SMA-2164 User manual

USER GUIDE
NI SMA-2164 Test Fixture
Differential Digital I/O Accessory
The NI SMA-2164 test fixture is a breakout box for National Instruments
differential digital waveform generator/analyzer modules. This fixture
provides an easy way to connect to other devices for testing and debugging.
This guide explains how to set up and use the NI SMA-2164 with
NI 6561/6562 modules.
Contents
Conventions ............................................................................................ 2
What You Need to Get Started ............................................................... 2
Related Documentation........................................................................... 3
Parts Locator ........................................................................................... 4
Installing Cables...................................................................................... 5
Connecting Signals ................................................................................. 6
Using SMA Connectors................................................................... 9
Making a Solder Connection ........................................................... 10
Terminating Signals ................................................................................ 12
Minimizing the Effects of Stubs ...................................................... 12
Differentially Terminating DIO and Control Signals ...................... 12
Using the NI SMA-2164 Prototyping Area ............................................ 13
Prototyping Circuits......................................................................... 13
Cleaning the Accessory........................................................................... 14
Specifications .......................................................................................... 15
Where to Go for Support......................................................................... 16

NI SMA-2164 User Guide 2 ni.com
Conventions
The following conventions are used in this manual:
<> Angle brackets that contain numbers separated by an ellipsis represent a
range of values associated with a bit or signal name—for example,
DIO <0..3>.
»The »symbol leads you through nested menu items and dialog box options
to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash. When this symbol is marked on a
product, refer to the Specifications section for information about
precautions to take.
bold Bold text denotes items that you must select or click in the software, such
as menu items and dialog box options. Bold text also denotes parameter
names.
italic Italic text denotes variables, emphasis, a cross reference, or an introduction
to a key concept. This font also denotes text that is a placeholder for a word
or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames, and extensions.
What You Need to Get Started
To set up and use the NI 2164, you need the following items:
❑SHB12-B12X cable assembly
❑Compatible NI digital waveform generator/analyzer, installed in a PXI
or CompactPCI chassis
You also may need the following optional items:
❑SMA cables

©National Instruments Corporation 3 NI SMA-2164 User Guide
❑Resistors for termination or characterization. The NI SMA-2164 ships
populated with 0 Ωresistors.
❑The documentation included with the digital waveform
generator/analyzer and driver software
Related Documentation
The NI digital waveform generator/analyzer ships with several documents
designed to familiarize you with different aspects of the module. The
documentation set includes the following pieces:
•NI Digital Waveform Generator/Analyzer Getting Started
Guide—Read this printed document to set up the digital waveform
generator/analyzer and configure it to complete your first acquisition
or generation.
•NI Digital Waveform Generator/Analyzer Help—This online
document provides more in-depth information about the hardware
capabilities of the module, theory of operation, programming flow,
and software reference.
• NI digital waveform generator/analyzer specifications—This printed
document provides specifications for your module.

NI SMA-2164 User Guide 4 ni.com
Parts Locator
Refer to Figure 1 to locate connectors and components on the
NI SMA-2164.
Figure 1. NI SMA-2164 Parts Locator Diagram
1 73-Pin Digital Data & Control (DDC) Connector
2 SMA Connector
3 Solder Pads
4 Resistor Network
5 Area Enlarged in Figure 6
6 Solder Pads
7 Labeling Strips
1
2
STROBE
CLK_LVPECL
+
+
IO_3
+
–
IO_7
IO_10
IO_14
IO_6
IO_11
IO_13
MADE IN U.S.A.
IO_15
ASSY192533A-01
+
–
+
–
+
+
+
–
–
+
–
–
–
–
IO_12
–
–
+
+
–
+
IO_4
IO_5
IO_8
IO_2
IO_9
–
+
–
+
+
–
IO_1
+
–
–
+
+
PFI_3
CLK_LVDS
+
PFI_2
+
–
+
–
PFI_1
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
IO_0
VOS
VOS
–
+
S/N
–
VOS
VOS
–
VOS
VOS
VOS
VOS
VOS
VOS
61
70
40
49
19
31
10
73
64
67
52
55
58
43
46
34
37
22
25
28
13
16
1
4
7
1
VOS
NI SMA-2164
DIFFERENTIAL
DIGITAL I/O ACCESSORY
FOR PATENTS: NI.COM/PATENTS
©COPYRIGHT 2005
3
4 5 6
7

©National Instruments Corporation 5 NI SMA-2164 User Guide
Installing Cables
The NI SHB12-B12X cable is designed to connect the NI SMA-2164 to the
NI digital waveform generator/analyzer. Figure 2 shows how to install this
cable.
Figure 2. Connecting a differential NI Digital Waveform
Generator/Analyzer to the NI SMA-2164
Refer to Figure 2 as you complete the following steps to install the
NI SHB12-B12X cable.
Caution Disconnect power from the device, accessory, and any other connected hardware
before connecting the cable to prevent damage to the hardware and personal injury. NI is
not liable for damage resulting from improper connections.
1 NI Digital Waveform Generator/Analyzer,
installed in a PXI chassis
2 NI SHB12-B12X Cable
3 NI SMA-2164
NI PXI-6561
100 MHz LVDSDIO
DIGITAL DATA & CONTROL
PFI 0
ACCESS ACTIVE
CLK
IN
CLK
OUT
1
3
2
NI PXI-1042
STROBE
CLK_LVPECL
+
+
IO_3
+
–
IO_7
IO_10
IO_14
IO_6
IO_11
IO_13
MADE IN U.S.A.
IO_15
ASSY192533A-01
+ –
+
–
+
+
+
–
–
+
–
–
–
–
IO_12
–
–
+
+
–
+
IO_4
IO_5
IO_8
IO_2
IO_9
–
+
–
+
+
–
IO_1
+
–
–
+
+
PFI_3
CLK_LVDS
+
PFI_2
+
–
+ –
PFI_1
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
VOS
IO_0
VOS
VOS
–
+
S/N
–
VOS
VOS
–
VOS
VOS
VOS
VOS
VOS
VOS
61 70
40 49 19 31 10
73
64 67
52 55
58
43 46 34 37 22 25 28 13 16
1
4 7
1
VOS
NI SMA-2164
DIFFERENTIAL
DIGITAL I/O ACCESSORY
FOR PATENTS: NI.COM/PATENTS
©COPYRIGHT 2005

NI SMA-2164 User Guide 6 ni.com
1. Install the driver software and digital waveform generator/analyzer
using the installation procedure in the NI Digital Waveform
Generator/Analyzer Getting Started Guide.
Note Always install the module in a computer or PXI/CompactPCI chassis before
attaching any cables or accessories. Refer to the NI Digital Waveform Generator/Analyzer
Getting Started Guide for instructions on installing the module.
2. Attach either end of an NI SHB12-B12X cable assembly to the DDC
connector of the digital waveform generator/analyzer and secure the
cable with the captive screws on the cable connector.
Note Do not use cables other than the NI SHB12-B12X cable with the NI SMA-2164.
The NI SMA-2164 is not compatible with the NI 653X products or with single-ended
NI digital waveform generator/analyzers, such as the NI 654X/655X.
3. Attach and secure the other end of the NI SHB12-B12X cable
assembly to the DDC connector of the NI SMA-2164 and secure them
together with the captive screws on the cable connector.
Connecting Signals
Each DIO, PFI, and clock channel of the digital waveform
generator/analyzer connects to a corresponding pin on the NI SMA-2164.
Refer to Figure 1 for the location of these pins on the NI SMA-2164.
Caution Before powering down the digital waveform generator/analyzer module, remove
power from the prototyping area of the NI SMA-2164. NI is not liable for any damage
resulting from improper signal connections.
Figure 3 shows the pinout of the DDC connector of the accessory. Table 1
describes the DDC signals in the pinout.

©National Instruments Corporation 7 NI SMA-2164 User Guide
Figure 3. NI SMA-2164 DDC Connector Pinout
GND
PFI_1
GND
PFI_2
GND
PFI_3
GND
RESERVED(NC)
GND
DIO 0
GND
DIO 1
GND
DIO 2
GND
DIO 3
GND
DIO 4
GND
DIO 5
GND
DIO 6
GND
DIO 7
GND
DIO 8
GND
DIO 9
GND
DIO 10
GND
DIO 11
GND
DIO 12
GND
DIO 13
GND
DIO 14
GND
DIO 15
GND
STROBE
GND
DDC CLK OUT LVDS
GND
RESERVED(NC)
GND
DDC CLK OUT LVPECL
GND
PFI_1*
PFI_2*
PFI_3* / GND
RESERVED(NC)
DIO 0*
DIO 1*
DIO 2*
DIO 3*
DIO 4*
DIO 5*
DIO 6*
DIO 7*
DIO 8*
DIO 9*
DIO 10*
DIO 11*
DIO 12*
DIO 13*
DIO 14*
DIO 15*
STROBE*
DDC CLK OUT LVDS*
RESERVED(NC)
DDC CLK OUT LVPECL*
73
71 72
70
68 69
67
65 66
64
62 63
61
59 60
58
56 57
55
53 54
52
50 51
49
47 48
46
44 45
43
41 42
40
38 39
37
35 36
34
32 33
31
29 30
28
26 27
25
23 24
22
20 21
19
17 18
16
14 15
13
11 12
10
89
7
56
4
23
1

NI SMA-2164 User Guide 8 ni.com
Note Refer to the NI Digital Waveform Generator/Analyzer Help at Program Files»
National Instruments»NI-HSDIO»Documentation»NI Digital Waveform
Generator/Analyzer Help for information about the number of available DIO channels
on your device.
All channels are routed differentially to high-bandwidth SMA connectors.
You can make connections to the DIO channels, the PFI channels,
DDC CLK OUT LVDS, DDC CLK OUT LVPECL, or STROBE on the
NI SMA-2164 using an SMA coaxial cable or by soldering directly to the
inline circuits. Examples of how to make these connections are provided in
the following sections.
Caution Connections that exceed any of the maximum ratings for the NI SMA-2164 or the
NI digital waveform generator/analyzer module can damage the module and the computer.
Maximum input ratings are provided in the Specifications section and in the specifications
Table 1. NI 656XDDC Connector Pins
Signal Name Signal Description
DDC CLK OUT LVDS Positive terminal for the exported Sample clock.
DDC CLK OUT LVDS* Complementary terminal for the LVDS exported Sample clock.
DDC CLK OUT LVPECL Positive terminal for the LVPECL exported Sample clock.
DDC CLK OUT LVPECL* Complementary terminal for the LVPECL exported Sample
clock.
STROBE Positive external Sample clock source which can be used for
dynamic acquisition.
STROBE* Complementary external Sample clock source which can be
used for dynamic acquisition.
DIO <0..15> Bidirectional digital I/O data channels 0 through 15.
DIO <0..15>* Complementary bidirectional digital I/O data channels
0 through 15.
PFI<1..3> Positive input terminals to the NI 656Xfor external triggers, or
output terminals from the NI 656Xfor events.
PFI<1..3>* Complementary input terminals to the NI 656Xfor external
triggers, or output terminals for the NI 656Xfor events.
GND Ground reference for signals.
RESERVED These terminals are reserved for future use. Do not connect to
these pins.

©National Instruments Corporation 9 NI SMA-2164 User Guide
document that shipped with the digital waveform generator/analyzer. NI is not liable for
any damage resulting from such signal connections.
Using SMA Connectors
Each signal pair is labeled on the NI SMA-2164. These connectors are
arranged so that you can make quick connections to each polarity using a
standard SMA coaxial cable assembly. Connectivity is made by inserting
the cable receptacle onto the appropriate connector and tightening the
receptacle sufficiently.
Note Refer to the receptacle documentation to assure that proper connections are made to
signal and ground.
Figure 4 shows how to make an SMA coaxial cable assembly connection.
Figure 4. SMA Coaxial Cable Connection
1SMACable 2 SMA Connector
DIO
1
2

NI SMA-2164 User Guide 10 ni.com
Making a Solder Connection
Each signal pair is routed through a simple circuit to provide solder and
probe access to the signals. Signal pairs are routed to a symmetric circuit,
as shown in Figure 5.
Figure 5. Symmetric Circuits
Figure 6 is an enlarged portion of Figure 1. Figure 6 shows the routing of
the signal pairs and the placement of the resistors shown in Figure 5.
SMA
SMASMA
0 Ω
0 Ω
R2
R3
R1
R0
R4
0 Ω
R4 v
R2
R3
R5
R5
R1
R0
v
DIO
DIO
SMA
SMA
SMA
0 Ω
0 Ω
0 ΩDIODIO

©National Instruments Corporation 11 NI SMA-2164 User Guide
Figure 6. Solder Connection
Note This figure shows channels IO_0 and IO_1. This circuit is copied on each pair of
channels, though the reference designators vary. Figure 5 is the schematic representation
of the PCB shown in Figure 6.
Resistors R3, R4, R11, R12, R101, R377, R80, R86, R84, R104, and R345
are unpopulated and are further discussed in the Cleaning the Accessory
and Prototyping Circuits sections. These pads are available for probing and
for soldering.
IO_1
IO_0
VOS
VOS
+
+
R101
R84 R63
R105
R150 R129
R80 R67
R11
R345
R377
R125
R4R3 R12
R142

NI SMA-2164 User Guide 12 ni.com
Terminating Signals
Termination of high-speed digital signals is necessary to prevent signal
reflections and force signal channels to a known state when no signal is
present. Pads for terminating resistors are connected to all DIO and control
channels on the NI SMA-2164. These pads are labeled in Figure 1 and are
shown in more detail in Figure 6.
Note Proper termination needs are application-specific. For some special considerations
for choosing resistor values, refer to the Cleaning the Accessory section.
Minimizing the Effects of Stubs
Stubs are unterminated tributaries from the original signal path. Stubs
decrease the signal quality of the system by adding reflections to the
transmission channels. To minimize the effect of stubs, termination is
placed at the end of the signal path.
Note Refer to the NI Digital Waveform Generator/Analyzer Help for more information
about proper signal termination.
If your signal transmission line ends on the NI SMA-2164, you can use the
provided resistor pads to solder termination resistors. If your signal
terminates somewhere other than the NI SMA-2164, NI recommends
terminating the transmission line at the final signal destination. Each signal
pair is routed through a symmetric circuit, shown in Figure 5.
Differentially Terminating DIO and Control Signals
Resistors R80, R63, R64, and R69 in Figure 6 can be populated with
0402-sized resistors to provide termination. It is recommended that these
resistors are each populated with 50 Ωresistors in order to provide the
expected 100 Ωof differential termination.

©National Instruments Corporation 13 NI SMA-2164 User Guide
Using the NI SMA-2164 Prototyping Area
The NI SMA-2164 prototyping area is designed to aid you in the
following tasks:
• Prototyping and testing circuits—Use the NI SMA-2164 in
conjunction with an NI digital waveform generator/analyzer for
prototyping, evaluating, and testing custom circuits and/or
components.
• Creating custom interfaces—Use the NI SMA-2164 for creating
custom interfaces to other cables or devices. You can use the
prototyping area to mount and interface the integrated circuits (ICs) or
connectors required for your application.
• Prototyping a DUT load board—Use the NI SMA-2164 as a simple
DUT interface board or as a prototype of a custom DUT load board.
The prototyping area is labeled in Figure 1. Also labeled in this diagram are
the erasable labeling strips for your notes as you use the prototyping area.
Prototyping Circuits
Each signal pair is routed to a simple debug and prototyping circuitry
illustrated in Figure 5.
By placing or removing components, each circuit can be configured to
accomplish one of the following tasks, which are described in more detail
in the following sections.
• Differentially terminate the signals—For more information about
differential termination, refer to the Differentially Terminating DIO
and Control Signals section.
• Externally provide a common mode or offset voltage to a differential
signal—If an application requires an externally provided offset
voltage, resistors R3, R4, R11, and R12 may be populated with
0603-sized resistors in order to provide a connection point. For
balanced application to a differential signal, it is recommended that R0
and R1 each be populated with a 3.74 kΩresistor.
The node shared by R3, R4, R11, and R12 is electrically connected
between all DIO circuits.
• Externally probe or measure the common mode or offset of a
differential signal—If an application requires that the offset voltage be
measured on a differential signal, resistors R80 and R63 can be
populated. R80 and R63 are connected at a node which is connected to
an SMA pad through a 0 Ωjumper. This SMA can be populated for
coaxial connectivity to the offset voltage of the signal. R80 and R63

NI SMA-2164 User Guide 14 ni.com
should each be 50 Ωif termination is required, else, larger values of
3.74 kΩare more appropriate.
• Channel-to-channel connectivity—If it is required that two channels
be connected to one another (for round-trip delay elimination for
example), neighboring channels can be connected to each other by
populating a size 1206 0 jumper on resistors R345 and R377 in
Figure 6. By populating these resistors, DIO_0 connects to DIO_1,
DIO_2 connects to DIO_3, and so on, and CLKOUT_LVDS connects
to STROBE.
Cleaning the Accessory
Disconnect all cables to the NI SMB-2164 before cleaning. To remove
light dust, use a soft, nonmetallic brush. To remove other contaminants, use
alcohol wipes. The unit must be completely dry and free from contaminants
before returning to service.

©National Instruments Corporation 15 NI SMA-2164 User Guide
Specifications
Digital I/O
DIO channels.......................................... 16, differential
Control I/O channels .............................. 6, differential
Resistors
Number................................................... 44
Voltage
Maximum voltage .................................. 5 V
Prototyping Area
Dimensions............................................. 4 cm × 9 cm
(1.57 in. × 3.54 in.)
Solder pads............................................. 154, unconnected
Traces
Type ....................................................... Matched length to 100 mils
AC impedance........................................ 100 Ωdifferential
Physical
Dimensions............................................. 17.55 cm × 2.07 cm × 20.32 cm
(6.91 in. ×0.816 in. ×8 in.)
I/O connectors........................................ One 73-pin DDC connector,
44 SMA connectors
CE Compliance
Refer to the regulatory statement for this product for additional
compliance information. To obtain this information for this product,
visit ni.com/certification, search by model number or product line,
and click the appropriate link in the Certification column.
Caution When connected to other test objects, this product may cause radio interference.
In a residential environment, the user may be required to take adequate measures to reduce
the radio interference.

National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.
Refer to the Terms of Use section on ni.com/legal for more information about National
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade
names of their respective companies. For patents covering National Instruments products, refer to the
appropriate location: Help»Patents in your software, the patents.txt file on your CD, or
ni.com/patents.
© 2005 National Instruments Corporation. All rights reserved. 374063A-01 Mar05
Where to Go for Support
The National Instruments Web site is your complete resource for technical
support. At ni.com/support you have access to everything from
troubleshooting and application development self-help resources to email
and phone assistance from NI Application Engineers.
National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to help
address your support needs. For telephone support in the United States,
create your service request at ni.com/support and follow the calling
instructions or dial 512 795 8248. For telephone support outside the United
States, contact your local branch office:
Australia 1800 300 800, Austria 43 0 662 45 79 90 0,
Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 6555 7838,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 385 0 9 725 725 11, France 33 0 1 48 14 24 24,
Germany 49 0 89 741 31 30, India 91 80 51190000,
Israel 972 0 3 6393737, Italy 39 02 413091, Japan 81 3 5472 2970,
Korea 82 02 3451 3400, Lebanon 961 0 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 0 348 433 466, New Zealand 0800 553 322,
Norway 47 0 66 90 76 60, Poland 48 22 3390150,
Portugal 351 210 311 210, Russia 7 095 783 68 51,
Singapore 1800 226 5886, Slovenia 386 3 425 4200,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 0 8 587 895 00, Switzerland 41 56 200 51 51,
Taiwan 886 02 2377 2222, Thailand 662 992 7519,
United Kingdom 44 0 1635 523545