W2641A [HP]
DisplayPort Test Point Access Adapter; DisplayPort测试点接入适配器
| 型号： | W2641A |
| 厂家： | 
HEWLETT-PACKARD |
| 描述： | DisplayPort Test Point Access Adapter |
| 文件： | 总8页 (文件大小：662K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Agilent W2641A DisplayPort
Test Point Access Adapter
Data Sheet
Connect to your DisplayPort device
to make physical layer parametric
measurements
DisplayPort standard
Emerging standards for
consumer electronic devices and
entertainment equipment provide
for higher screen resolutions
than ever before, which meets
the market need for the highest
computer monitor viewing
1
The evolution of the DisplayPort standard, sponsored by VESA , was driven by
demand for higher-resolution and less-expensive computer displays. Computer
industry insiders have long believed that the industry would ultimately shift to
all digital flat-panel displays, and DisplayPort is the digital transport interface
standard that finally promises to supplant the popular VGA CRT monitor. The
low-profile DisplayPort connector is ideal for crowded back panels, motherboard
designs able to drive multiple monitors, and portable equipment that offers
uncompromised viewing. The DisplayPort connector has been designed to support
the high DisplayPort bit rates now and in the future. It is likely that DisplayPort
will become the primary video interface for desktop and laptop personal
computers, and it may ultimately be used in consumer electronics equipment
such as DVD players.
quality possible. High screen
resolutions necessitate higher
link rates which place new
demands on the source, sink
and media such as cable or PC
boards. This electrical signal
environment makes measurement
of physical layer parameters even
more important and at the same
time, more difficult. The Agilent
Techologies W2641A DisplayPort
test point access adapter
The DisplayPort standard covers a wide range of screen resolutions and physical
configurations. It outlines tests for the high-speed digital signals for source
and sink testing, low-frequency control path (the AUX channel), link -layer and
protocol verification such as HDCP (high bandwidth content protection) and
media evaluation.
provides unrivaled convenience
and performance.
Impedance vs location can be analyzed on your DisplayPort designs
1
Video Electronics Standards Association (www.vesa.org)
2
Test point access adapters
Test point access adapters (TPA)
should be as transparent as possible to
each measurement, connect to a wide
range of test product form factors,
and have the flexibility to measure
several parameters. The W2641A TPAs
have low loss, very good impedance
characteristics and low intra-pair and
inter-pair skew to provide the high
signal fidelity connection required.
These TPAs have been designed to
conveniently connect to DisplayPort
receptacles without obstructing cables
or presenting a footprint near the
device under test greater than the
DisplayPort receptacle connector itself.
W2641A DisplayPort test point access
adapters provide the widest bandwidth
and best performance on the market,
thus enabling you to see the nuances
of your source eye diagrams, printed
circuit board and connector impedance
profiles and evaluate your DisplayPort
sink performance.
Pair a W2641A TPA with an Agilent N4903A J-BERT or 81250 ParBERT for DisplayPort
sink validation.
Use the Agilent 86100C digital communication analyzer with
a W2641A TPA for transmission line impedance analysis.
Use an Agilent Infiniium DSO90000 Series oscilloscope
with a W2641A TPA for DisplayPort source validation.
3
DisplayPort source testing
The DisplayPort Physical Layer Compliance Test Specification (CTS) covers
source tests such as level verification, pre-emphasis level, skew, jitter, data
eye, transition time and many other parameters. When you pair W2641A TPAs
with Agilent’s DSO90000 Infiniium oscilloscopes and the U7232A DisplayPort
compliance test software, you will have uncompromised accuracy and unrivaled
simplicity in characterizing your source design. The TPA’s excellent performance
enables you to clearly see nuances in the transmitted pattern and determine how
to improve the performance of the source and channel. The U7232A DisplayPort
compliance test software automates measurements of the multitude of parameter
configurations possible in DisplayPort devices and provides you with an extensive
report on how the devices have performed. The U7232A is designed for use in
validation and compliance labs so you can use the full measurement suite before
you submit your devices to a DisplayPort Authorized Test Center for certification
to make sure you’ve taken care of problems in advance.
DisplayPort AUX channel testing
The DisplayPort specification includes a special channel, the AUX channel, which
is used to dynamically coordinate the link source and sink. The W2641A exposes
this differential lane that operates at 1 Mbs with two connections available: one
using the standard SMP connectors used in the high-speed lanes and another on
a digital interface header. Also available on the digital interface header are power
supply lines and the hot plug detect (HPD) line, which can also be probed for
noise measurements, triggering, etc.
DisplayPort sink testing
The DisplayPort Physical Layer Compliance Test Specification stipulates a receiver
tolerance test regimen where the digital data is transmitted with phase jitter
having sinusoidal and random characteristics, as well as a calibrated channel
degradation (called intersymbol interference, or ISI). The signal parameters, such
as jitter quantity and level, vary according to the bit rate being tested. These
signals can be injected to a DisplayPort sink from Agilent sources such as the
N4903A JBERT and the 81250 ParBERT through the W2641A.
For the calibration of the sink test setup, a complementary receptacle test fixture
is needed. This is available as a third party product BIT-DP-RTF-0001 from BitifEye
Digital Test Solutions, (see www.bitifeye.com). The same product is needed for
testing so-called tethered devices, i.e. devices such as monitors with DisplayPort
cables inseparably connected to them. To facilitate automated measurements and
process control, the N5990A test automation software platform offers automated
DisplayPort compliance and characterization tests.
4
DisplayPort device connection
The W2641A connects directly into
a DisplayPort receptacle connector
such as found on graphic cards,
motherboards and on PCs. The fixture
was designed to reduce possibility
of interference to other connectors
and cable types. Even so, there are
always connection configurations
where interference is seen or where
perpendicular entry to the W2641A
is inconvenient or impossible. To
address some of these conditions, the
W2641A DisplayPort Adapter fixture
comes with highly flexible cables with
constant impedance characteristics
even when acutely bent. A diagram of
such a test setup is shown below and
the impedance difference is shown
adjacent. It is clear that no degradation
in measurement accuracy is seen.
Extra convenience in connection is
afforded by the addition of the N5460A
cables, which have a right angle SMP
connection. These are phase matched
to less than 2ps and have superior
impedance and loss characteristics.
Less than 1% impedance change for bent cable
DisplayPort media testing
The W2641A Test Point Adapter can
also be used to evaluate motherboard
trace layout and connector design by
connecting to a DisplayPort receptacle
connector. With this connection
a vector network analyzer or a
TDR may be used to evaluate your
design. To aid in this analysis, TRL
calibration structures are provided
for de-embedding the fixture – such
a de-embed process will move the
reference plane of measurement to
the plug pins of the mated connection
(receptacle mated with the adapter’s
plug) to afford the utmost accuracy.
W2641A with N5460A SMP right angle cable
5
W2641A test accessories
Model number
Description
Quantity
N5460A
Phase matched pairs: right-angle SMP
to SMA male (recommended, options)
1, 2, 4
E4809-23801
E4809-23802
Cable plug-in tool (optional)
1
1
Cable removal tool (required for right angle
SMP cables)
N4235-61602
Phased matched pair: SMP to SMA cables
(standard replacement cables for W2641A)
2, 4, 8
Test accessories
Model number
11667B
Description
Power splitter, DC to 26.5 GHz, 3.5-mm (f) connectors
Power divider, DC to 26.5 GHz, 3.5-mm (f) connectors
11636B
8493B
Coaxial attenuator (3, 6, 10, 20 or 30 dB), DC to 18 GHz, SMA
connector
1250-1158
1250-1159
1250-1397
1250-1741
1250-1698
1250-1694
15442A
SMA (f - f) adapter, DC to 18 GHz
SMA (m - m) adapter, DC to 18 GHz
Right-angle adapter, SMA (m - m)
Right-angle adapter, SMA (f - m)
SMA tee adapter (m, f, f), DC to 12.4 GHz
SMA (m) to SMA (f) Adapter
Cable kit, four 90-cm (36-inch) SMA (m - m) cables
15443A
Matched cable pair, two 90-cm (36-inch) SMA (m - m) cables,
propagation delay within 25 ps
1810-0118
SMA (m) 50 Ω termination
33SMA-Q50-0-4
SMA push-on adaptors from S.M. Electronics (or equivalent)
6
Related literature
Publication title
Publication type
Publication number
Infiniium 90000 Series Oscilloscopes and
1160 Series Probes
Data Sheet
5989-7819EN
U7232A DisplayPort Compliance Test Software
Data Sheet
5989-7198EN
5989-9147EN
Agilent method of implementation for
DisplayPort sink compliance test
Application Note
N4903A JBERT
Data Sheet
Data Sheet
Data Sheet
Data Sheet
5989-2899EN
5989-8688EN
5989-5537EN
5989-5483EN
N4915A-006 DisplayPort ISI generator
ParBERT TMDS generator
N5990A Test automation software
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7
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Revised: October 2, 2008
Product specifications and descriptions
in this document subject to change
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© Agilent Technologies, Inc. 2009
Printed in USA, February 10, 2009
5989-7274EN
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