agilent W2641A displayport test point access adapter data sheet connect to your displayport device to make physical layer parametric measurements
2 displayport standard the evolution of the displayport standard, sponsored by vesa 1 , 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. 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. 1 video electronics standards association ( www.vesa.org ) 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 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 provides unrivaled convenience and performance. impedance vs location can be analyzed on your displayport designs
3 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.
4 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 agilents dso90000 infiniium oscilloscopes and the u7232a displayport compliance test software, you will have uncompromised accuracy and unrivaled simplicity in characterizing your source design. the tpas 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 youve 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.
5 less than 1% impedance change for bent cable 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. 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 C such a de-embed process will move the reference plane of measurement to the plug pins of the mated connection (receptacle mated with the adapters plug) to afford the utmost accuracy. W2641A with n5460a smp right angle cable
6 W2641A test accessories model number description quantity n5460a phase matched pairs: right-angle smp to sma male (recommended, options) 1, 2, 4 e4809-23801 cable plug-in tool (optional) 1 e4809-23802 cable removal tool (required for right angle smp cables) 1 n4235-61602 phased matched pair: smp to sma cables (standard replacement cables for W2641A) 2, 4, 8 test accessories model number description 11667b power splitter, dc to 26.5 ghz, 3.5-mm (f) connectors 11636b power divider, dc to 26.5 ghz, 3.5-mm (f) connectors 8493b coaxial attenuator (3, 6, 10, 20 or 30 db), dc to 18 ghz, sma connector 1250-1158 sma (f - f) adapter, dc to 18 ghz 1250-1159 sma (m - m) adapter, dc to 18 ghz 1250-1397 right-angle adapter, sma (m - m) 1250-1741 right-angle adapter, sma (f - m) 1250-1698 sma tee adapter (m, f, f), dc to 12.4 ghz 1250-1694 sma (m) to sma (f) adapter 15442a 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 termination 33sma-q50-0-4 sma push-on adaptors from s.m. electronics (or equivalent)
7 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 agilent method of implementation for displayport sink compliance test application note 5989-9147en n4903a jbert data sheet 5989-2899en n4915a-006 displayport isi generator data sheet 5989-8688en parbert tmds generator data sheet 5989-5537en n5990a test automation software data sheet 5989-5483en product web site for the most up-to-date and complete application and product information, please visit our product web site at: www.agilent.com/find/scope-apps agilent technologies oscilloscopes multiple form factors from 20 mhz to >90 ghz | industry leading specs | powerful applications
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