Texas Instruments CDCM1804 User manual

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 
2006 High Performance Analog/CDC
User’s Guide
SCAU009C

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Copyright 2006, Texas Instruments Incorporated

EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:.
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR
EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end−product fit for general
consumer use. Persons handling the product(s) must have electronics training and observe good engineering
practice standards. As such, the goods being provided are not intended to be complete in terms of required
design−, marketing−, and/or manufacturing−related protective considerations, including product safety and
environmental measures typically found in end products that incorporate such semiconductor components or
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electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore
may not meet the technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be
returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE
EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR
FITNESS FOR ANY PARTICULAR PURPOSE.
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discharge.
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TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior
to handling the product. This notice contains important safety information about temperatures and voltages. For
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FCC WARNING
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR
EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end−product fit for general
consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for
compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide
reasonable protection against radio frequency interference. Operation of this equipment in other environments
may cause interference with radio communications, in which case the user at his own expense will be required
to take whatever measures may be required to correct this interference.
Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265
Copyright 2006, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 3 V and 6 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
45°C. The EVM is designed to operate properly with certain components above 60°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2006, Texas Instruments Incorporated

How to Use This Manual
iii
Preface
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About This Manual
The CDCM1804/CDCP1803 evaluation module (EVM) allows evaluation of
the CDCM1804/CDCP1803 LVPECL clock drivers. The CDCM1804 provides
three LVPECL and one CMOS outputs, while the CDCP1803 provides three
LVPECL outputs only. This user’s guide provides a brief overview of the EVM,
setup and operation instructions, and typical test results that can be expected.
In addition, it provides recommendations on proper termination, decoupling,
and how to use the CDCM1804/CDCP1803 in single-ended applications, such
as LVTTL, LVCMOS, or other differential clock signals such as LVPECL,
LVDS, HSTL, SSTL−2, CML VML or similar 2.5-V or 3.3-V signals and provide
a differential LVPECL output.
Requesting an EVM
Contact your local marketing or sales representative to request a
CDCM1804/CDCP1803 EVM.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—Introduction
-Chapter 2—EVM PCB
-Chapter 3—EVM Configuration
-Chapter 4 Using the EVM
-Chapter 5—Schematics, Parts List, Board Stackup, Board Layouts, and
References

How to Use This Manual
iv
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
For More Information
If you need assitance with this device, please email
[email protected]

Contents
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1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 EVM PCB 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Use of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Design of Differential Traces 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Other Design Tweaks 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 CDCM1804/CDCP1803 EVM Kit Contents 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 CDCM1804/CDCP1803 EVM Configuration 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Default EVM Delivery 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Mode Setting for CDCM1804/CDCP1803 Through EN, S0, S1, and S2 3-2. . . . . . . . . . . .
4 Using the EVM 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 EVM Power Connections 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Applying An Input 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Typical Test Results 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Schematic, Parts List, Board Stack Up, Board Layouts, and References 5-1. . . . . . . . . . . . .
5.1 Schematic 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Parts List 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Board Stackup and Layouts 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 References 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
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1−1 CDCM1804/CDCP1803 EVM Default Setup 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 EVM Power Connections for the CDCM1804/CDCP1803 Evaluation 4-2. . . . . . . . . . . . . . . . .
4−2 Typical Output From the CDCM1804/CDCP1803 EVM 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−1 Schematic of the EVM Signal Path 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−2 Top Layer 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−3 PWR1 Layer 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−4 GND1 Layer 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−5 Bottom Layer 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction
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The Texas Instruments (TIt) CDCM1804/CDCP1803 evaluation module
(EVM) is used to evaluate the CDCM1804/CDCP1803 clock driver (24-pin
MLF) and ease the evaluation of the clock drivers without having to modify
existing board design.
The CDCM1804 clock drivers distributes one pair of differential clock input to
three pairs of differential clock outputs (Y0:Y2) and an additional CMOS output
(Y3) with minimum skew for clock distribution. The CDCM1804 is specifically
designed for driving 50-Ωtransmission lines.
The CDCP1803 clock drivers distributes one pair of differential clock inputs to
three pairs of differential clock outputs (Y0:Y2) with minimum skew for clock
distribution. The CDCP1803 is specifically designed for driving 50-Ω
transmission lines.
Both devices are capable of accepting any differential swing as small as 150
mV and as high as a 3.6-V signal swing, which makes it ideal for signal level
translation. Both the CDCM1804 and the CDCP1803 can accept single-ended
signals such as LVTTL or LVCMOS or other differential clock signals such as
LVPECL, LVDS, HSTL, SSTL−2, CML, and VML or similar 2.5-V or 3.3-V
signals and provide a differential LVPECL output.
The CDCM1804/CDCP1803 are both 3.3-V LVPECL clock drivers
(CDCM1804 provides three LVPECL + one CMOS outputs). This evaluation
module (EVM) is designed to quickly evaluate the CDCM1804/CDCP1803
with flexibility in having single-ended or differential signals or as level
translator. In addition, the CDCM1804/CDCP1803 incorporate a VBB
reference voltage pin to support reception of single-ended input signals such
as: LVTTL, LVCMOS, LVPECL, HSTL, SSTL−2, CML, and LVDS (when the IN
input pair are ac-coupled).
This user’s guide gives a brief overview of the EVM, setup and operation
instructions, and typical test results that can be expected. Detailed information
relating to the CDCM1804/CDCP1803 can be found in the devices respective
data sheets, available from www.ti.com/clocks. A picture of the EVM, with
CDCM1804/CDCP1803 device installed, is shown in Figure 1−1.
Chapter 1

1-2
Figure 1−1.CDCM1804/CDCP1803 EVM Default Setup