UG-521 [ADI]
Evaluating the CN-0285 Wideband Tx Modulator Solution; 评估CN- 0285宽带发射调制器解决方案
| 型号： | UG-521 |
| 厂家： | 
ADI |
| 描述： | Evaluating the CN-0285 Wideband Tx Modulator Solution |
| 文件： | 总8页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Evaluation Board User Guide
UG-521
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the CN-0285 Wideband Tx Modulator Solution
FEATURES
EQUIPMENT NEEDED
Self-contained board including
ADF4351 wideband PLL + VCO
ADL5375 wideband IQ modulator
Ultralow noise voltage regulators: ADP150, ADP3334
25 MHz TCXO reference
A standard PC running Windows® XP, Windows Vista (32-bit),
or Windows 7 with a USB port
EVAL-CN0285-EB1Z circuit evaluation board
5.5 V power supplies
An IQ signal source, such as the Rohde & Schwarz AMIQ
A spectrum analyzer, such as the Rohde & Schwarz FSQ8
USB interface
Accompanying ADF4351 software allows control of
synthesizer functions from PC
GENERAL DESCRIPTION
The EVAL-CN0285-EB1Z is the evaluation board described in
the Circuits From the Lab™ Circuit Note CN-0285, Broadband
Low EVM Direct Conversion Transmitter. A photo of the board
is shown in Figure 1. It contains the ADF4351 synthesizer, the
ADL5375 wideband transmit modulator, and ultralow noise
LDOs. The board can be controlled using the ADF4351
programming software. A USB cable is included with the board
to connect to a PC USB port.
ONLINE RESOURCES
Documents Needed
ADF4351 Data Sheet
ADL5375 Data Sheet
ADP150 Data Sheet
ADP3334 Data Sheet
Required Software
ADF435x programming software
Design and Integration Files
Schematics, Layout Files, Bill of Materials
Additional information, including other PLL data sheets,
technical notes, articles, and ADIsimPLL™ PLL simulation
software from Analog Devices, Inc., is available at
www.analog.com/pll.
PHOTO OF THE EVALUATION BOARD
Figure 1. EVAL-CN0285-EB1Z
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
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TABLE OF CONTENTS
Features .............................................................................................. 1
Power Supplies...............................................................................3
IQ Inputs.........................................................................................3
RF/LO Outputs..............................................................................3
Loop Filter and Charge Pump Current ......................................3
Reference Source ...........................................................................3
Evaluation Board Software Quick Start Procedures.....................4
Online Resources.............................................................................. 1
Equipment Needed........................................................................... 1
General Description ......................................................................... 1
Photo of the Evaluation Board.................................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware............................................................ 3
REVISION HISTORY
3/13—Revision 0: Initial Version
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EVALUATION BOARD HARDWARE
The default loop filter is set to 70 kHz. Using a charge pump
setting of 2.5 mA is recommended.
POWER SUPPLIES
The user must apply 5.5 V to the VSUPPLY power connectors
(4 mm banana connectors). An LED, D6, indicates when USB
power is available, and another LED, D5, indicates when the
main board is powered. Switch SW-EXT is used to switch in the
5.5 V supply.
IQ INPUTS
The ADL5375 has four differential IQ inputs. These are accessi-
ble from the SMA connectors and should be connected to an
appropriate analog baseband IQ source such as the Rhode &
Schwarz AMIQ. Set the dc bias voltage for the IQ inputs at 0.5 V.
RF/LO OUTPUTS
The ADL5375 RF output is ac-coupled out to the RFOUT SMA.
There are also two LO output SMA connectors that can be used
to view the filtered ADF4351 RF outputs on a spectrum analyzer.
When connecting to an analyzer, terminate the unused LO
output with a 50 Ω termination. When measuring EVM or
adjacent channel leakage current (ACLR), disconnect these LO
outputs by removing Capacitors C72 and C73 to prevent
loading the circuit.
Figure 2. Loop Filter Layout
REFERENCE SOURCE
The 25 MHz TCXO from Rakon provides the necessary
reference signal. An external REFIN can be used if desired.
In this case, disable the on-board TCXO by removing R59.
R9 can be populated with 50 Ω to match the impedance of the
evaluation board to the external reference source.
LOOP FILTER AND CHARGE PUMP CURRENT
The loop filter schematic is included in the evaluation board
and can be found at www.analog.com/CN0285-DesignSupport.
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Evaluation Board User Guide
EVALUATION BOARD SOFTWARE QUICK START PROCEDURES
Confirm that Analog Devices RFG.L Eval Board connected is
displayed in the bottom left corner of the window. Otherwise,
the software has no connection to the evaluation board. In this
case, check that the cable connection and USB drivers are
correctly installed.
The control software for EVAL-CN0285-EB1Z uses the
standard ADF4351 programming software. For more details on
the installation of this software, consult UG-435, Evaluation
Board for the ADF4351 Fractional-N PLL Frequency Synthesizer.
After installing the software, run the software by clicking the
ADI ADF435x file on the desktop or in the Start menu. The
software front panel opens (see Figure 3).
Program the RF output frequency in the Main Controls tab of
the software front panel.
Figure 3. Software Front Panel
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NOTES
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NOTES
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NOTES
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NOTES
Evaluation Board User Guide
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG11267-0-3/13(0)
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