Texas Instruments CDCM7005 User Manual
CDCM7005 (QFN Package)
Evaluation Module Manual
HPA/High Speed Communications
User’s Guide
2005 Clock Drivers
SCAU015
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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2005, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the 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.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the supply voltage range of 3 V and 3.6 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 2004, Texas Instruments Incorporated
About This Manual
This manual explains how to use the CDCM7005 evaluation module (EVM)
and provides guidelines to build the customer’s own systems. The manual
includes schematics, layout, bill of materials, and a software description.
How to Use This Manual
Related Documentation From Texas Instruments
Preface
Read This First
This document contains the following chapters:
- Chapter 1—Introduction
- Chapter 2—Quick Start
- Chapter 3—EVM Hardware
- Chapter 4—Serial Peripheral Interface (SPI) Software
- Chapter 5—Schematics, Board Layout, and Parts List
Related Documentation From Texas Instruments
- CDCM7005 Data Sheet, SCAS793, Texas Instruments
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.
If You Need Assistance. . .
If you need assitance with this device, please email
clocks_apps@list.ti.com
iii
Contents
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 CDCM7005 Functional Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Quick Start 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Hardware 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Board View and Connector Location 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Hardware Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 Power Supply (P1, P2) 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 Onboard Switches and Indicators (SW1−SW2, D1−D4) 3-2. . . . . . . . . . . . . . . . . . .
3.2.3 Programming Interfaces (J30, J31) 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4 Loop Filter (J32−J34) 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5 High-Speed Outputs and Inputs (J1−J4, J6−J11, J13, J14, J22, and J23) 3-3. . .
3.2.6 VCXO Inputs and Outputs (J16−J18) 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.7 AC-Coupling at PRI_REF (C1, R4, R6) and SEC_REF (C5, R13, R15) 3-4. . . . .
4 Serial Peripheral Interface (SPI) Software 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Functional Description 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Software Installation 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Level Circuit Diagram 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Application Circuit Diagram 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 Passive Loop Filter 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2
6 Parts List, Board Layouts, and Schematics 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Parts List 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Board Layout 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 Schematic 6-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Active Loop Filter Using OPA341 5-3. . . . . . . . . . . . . . . . . . . . . . . . . .
v
Contents
Figures
3−1 Board View 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 Screen View 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−1 CDCM7005 With a Passive Loop Filter Configuration 5-2. . . . . . . . . . . . . . . . . . . . . . . . .
5−2 CDCM7005 With an External Active Loop Filter Using OPA341 5-3. . . . . . . . . . . . . . . . . . . . .
6−1 Component View and Silkscreen (Top Side) 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6−2 Component View and Silkscreen (Bottom Side) 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6−3 Top Layer View 6-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6−4 Bottom Layer View 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6−5 Ground Plane View 6-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6−6 Power Layer View 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
3−1 Filter Configurations 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi
Chapter 1
Introduction
The CDCM7005 is a high-performance, low phase noise and low skew clock
synchronizer that synchronizes an on-board voltage controlled crystal
oscillator (VC(X)O) frequency to an external reference clock. The device
operates up to 2.2 GHz. The PLL loop bandwidth and damping factor can be
adjusted to meet different system requirements by selecting the external
VC(X)O, loop filter components, frequency for PFD, and charge pump current.
Each of the five differential LVPECL and five LVCMOS pair outputs can be
programmed by a serial peripheral interface (SPI). The SPI allows individual
control of the frequency and enable/disable state of each output. As the
system requires external components like a loop filter and VC(X)O, this EVM
provides an easy method to evaluate and modify the performance and
parameters of the clock system in conjunction with the specific customer
application. Loop bandwidth can be selected as low as 10 Hz or less, allowing
the device to clean the system’s clock jitter.
In non PLL mode, the CDCM7005 can be used as a simple LVPECL or
LVCMOS buffer with divider options.
Topic Page
1.1 CDCM7005 Functional Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
1-1
CDCM7005 Functional Block Diagram
1.1 CDCM7005 Functional Block Diagram
REF_SEL
PRI_REF
SEC_REF
CTRL_LE
CTRL_DATA
CTRL_CLK
RESET or
HOLD
VCXO_IN
VCXO_IN
VBB
freq. detect
Clock
> 2 MHz
AVCC
Progr. Delay
Progr. Delay
PECL
to
LVCMOS
FB_MUX
VCC
Selected REF Signal
Manual &
Automatic
CLK Select
LVCMOS
PD
REF_MUX
SPI LOGIC
Reference
Clock
freq. detect
> 2 MHz
Feedback
÷ 1
÷ 2
÷ 3
÷ 4
PECL
INPUT
÷ 6
/8
÷ 8
÷ 16
÷ 4
÷ 8
P16−Div
o
90
o
90
P Divider
Bias Generator
VCC − 1.3 V
VCC_CP
STATUS_REF /
PRI_SEC_CLK
STATUS_VCXO
/ I_REF_CP
PLL_LOCK
LOCK
Progr. Divider
M
N
10
M 2
Progr. Divider
12
N 2
PFD
HOLD
Charge
Pump
Current
Reference
LV
CMOS
LV
Y0_MUX
Y1_MUXY2_MUXY3_MUXY4_MUX
PECL
LV
CMOS
LV
CMOS
LV
PECL
LV
CMOS
LV
CMOS
LV
PECL
LV
CMOS
LV
CMOS
LV
PECL
LV
CMOS
LV
CMOS
LV
PECL
LV
CMOS
CP_OUT
Y0A
Y0B
Y1A
Y1B
Y2A
Y2B
Y3A
Y3B
Y4A
Y4B
1-2
GND
Chapter 2
Quick Start
In order to setup the EVM quickly and to take some measurements at default
settings, the following actions are required:
- Supply 3.3 V to P1, LED D4 will be on.
- Apply a single-ended reference clock to the reference clock input
PRI_REF (pin A1) or SEC_REF (pin B1). For default setting, the reference
clock must be 1/8
PRI_REF is selected. If REF_SEL is set to 0, then SEC_REF is selected.
This selection can be realized via J26 (header 1 and 2 is high; header 2
and 3 is low).
- Connect Y0/Y0B (or Y1/Y1B) to oscilloscope in order to check an output
signal. Ensure the oscilloscope has 50 Ω to ground termination.
th
of the VC(X)O frequency. If REF_SEL is set to 1, then
After power up, D1 is on if there is a valid reference clock and D2 is on if there
is a valid VC(X)O clock for the CDCM7005. If D3 turns on, then the reference
clock and the VC(X)O clocks are phase locked.
Quick Start
2-1
Chapter 3
EVM Hardware
This chapter discusses the EVM hardware.
Topic Page
3.1 Board View and Connector Location 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Hardware Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVM Hardware
3-1
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