National Semiconductor DS10CP152 User manual

November 2007
Rev. 0.1
1.5 Gbps 2x2 LVDS Crosspoint
Switch
DS10CP152 Evaluation Kit
USER MANUAL
Part Number: DS10CP152EVK NOPB
For the latest documents concerning these products and evaluation kit, visit lvds.national.com.
Schematics and gerber files are also available at lvds.national.com.

DS10CP152EVK User Manual
Table of Contents
Table of Contents..................................................................................................................... 2
Overview................................................................................................................................... 3
Description................................................................................................................................ 4
Evaluation................................................................................................................................. 5
Switch Configuration Truth Tables........................................................................................... 6
Typical Performance ................................................................................................................ 7
Page 2 of 7

DS10CP152EVK User Manual
Overview
The DS10CP152EVK is an evaluation kit designed for demonstrating performance of the
DS10CP152, a 1.5 Gbps 2x2 LVDS Crosspoint Switch. The evaluation kit is comprised of the
DS10CP152 with its associated input and output SMA connectors and jumpers to manually
configure the switch.
The purpose of this document is to familiarize the user with the DS10CP152EVK, to suggest test
setup procedures and instrumentation to test the device optimally, and to guide the user through
some typical measurements that demonstrate the performance of the DS10CP152 in typical
applications.
Figure 1. Photo of the DS10CP152EVK
Page 3 of 7

DS10CP152EVK User Manual
Description
Figure 2 shows the top layer drawing of the PCB with the silkscreen annotations. The 4.5 by 4.0
inch, four-layer PCB is designed to evaluate the functions of the DS10CP152.
4.5" x 4.0" PCB
VSS VDD
0.625"
IN10.625"
DS10CP152 0.625"
0.625"
0.625" 0.625"
0.75" 0.75"
0.75"
0.75"
IN0
OUT1
OUT0
NATIONAL LOGO
P/N: DS10CP152EVK
SERIAL NUMBER
R3 and R4
Footprints
H
L
JP4 JP5
SEL0 SEL1
JP1 JP2
EN0 EN1
Figure 2. Top Layer Floor Plan of the DS10CP152EVK
Page 4 of 7

DS10CP152EVK User Manual
Evaluation
This section provides recommended test setup procedure for the device evaluation. Figure 3
depicts a typical setup and instrumentation you may use for the device evaluation.
1. Configure the test setup as shown in Figure 3.
2. Set and enable the desired INn to OUTn drivers by selecting SEL0, SEL1, EN0 and EN1
according to Tables 1 – 2.
3. Apply + supply (3.3V typical) to the VDD and – supply (ground) to the VSS connectors.
4. Connect a signal source (signal generator, data source, or an LVDS driver) to the desired
INn inputs on the board and adjust the signal parameters (VOH, VOL, VCM) so that they
comply with the device input recommendations.
5. Connect an oscilloscope to the selected OUTn outputs and view the output signals with
an oscilloscope with the analog bandwidth of at least 3 GHz.
Figure 3. DS10CP152 Test Setup Example
Page 5 of 7

DS10CP152EVK User Manual
Switch Configuration Truth Tables
SEL1 SEL0 OUT1 OUT0
0 0 IN0 IN0
0 1 IN0 IN1
1 0 IN1 IN0
1 1 IN1 IN1
Table 1. Switch Configuration Truth Table
EN1 EN0 OUT1 OUT0
0 0 Disabled Disabled
0 1 Disabled Enabled
1 0 Enabled Disabled
1 1 Enabled Enabled
Table 2. Output Enable Truth Table
Page 6 of 7

DS10CP152EVK User Manual
Typical Performance
This section of the User Manual shows a typical eye diagram you can expect to see when
evaluating the DS10CP152EVK.
Figure 4. DS10CP152 1.5 Gbps NRZ PRBS-7 Output Eye Diagram
Page 7 of 7

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