EVAL-CN0285-EB1Z Datasheet EVAL-CN0285-EB1Z | P1-P3

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

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 8

FEATURES

Self-contained board including

ADF4351 wideband PLL + VCO

ADL5375 wideband IQ modulator

Ultralow noise voltage regulators: ADP150, ADP3334

25 MHz TCXO reference

USB interface

Accompanying ADF4351 software allows control of

synthesizer functions from PC

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

EQUIPMENT NEEDED

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

GENERAL DESCRIPTION

The E VA L-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.

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

11267-001

UG-521 Evaluation Board User Guide

Rev. 0 | Page 2 of 8

TABLE OF CONTENTS

Features .............................................................................................. 1

Online Resources .............................................................................. 1

Equipment Needed ........................................................................... 1

General Description ......................................................................... 1

Photo of the Evaluation Board .................................................... 1

Revision History ............................................................................... 2

Evaluation Board Hardware ............................................................ 3

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

REVISION HISTORY

3/13—Revision 0: Initial Version

Evaluation Board User Guide UG-521

Rev. 0 | Page 3 of 8

EVALUATION BOARD HARDWARE

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.

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.

The default loop filter is set to 70 kHz. Using a charge pump

setting of 2.5 mA is recommended.

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.

11267-002

P1-P3 P4-P6 P7-P8

EVAL-CN0285-EB1Z

Mfr. #:

Buy EVAL-CN0285-EB1Z

Manufacturer:

Analog Devices Inc.

Description:

BOARD EVALUATION CN0285

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New from this manufacturer.

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