ANALOG DEVICES UG-123 Service Manual

Evaluation Board User Guide

One Technology Way • P. O . Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel : [phone] • Fax : [phone] • www.analog.com

UG-123

Evaluation Board for Fractional-N PLL Frequency Synthesizer

FEATURES

Self-contained board including synthesizer, VCO, 10 MHz

TCXO reference, USB interface, voltage regulators, and
loop filter (5.8 GHz)

Designed for 10 MHz PFD frequency, minimum charge pump

current, and 20 kHz loop bandwidth

Accompanying software allows control of synthesizer

functions from a PC (via USB interface)

Battery operated: choice of 3 V or 5 V supplies

GENERAL DESCRIPTION

The EVAL-ADF4158EB1Z evaluates the performance of the
ADF4158 frequency synthesizer for phase locked loops (PLL).
A digital picture is shown in Figure 1. It contains the ADF4158
synthesizer, a PC connector, SMA connectors for the power
supplies, and an RF output. There is also a low pass loop filter
(20 kHz) and a VCO (Z Communications, Inc., VCO940ME03

5.8 GHz) on board. The evaluation board is set up for a 10 MHz
PFD comparison frequency. An on-board TCXO provides the
10 MHz reference frequency. A USB cable is included with the
board to connect to a PC USB port.

The package also contains Windows® software (2000- and XP­compatible) to allow easy programming of the synthesizer.

EVALUATION KIT CONTENTS

Antistatic bag with USB warning label (free issue by Analog

Devices, Inc.)

Fractional-N synthesizer CD (with USB control) (issue by

Analog Devices)

Evaluation board box (Europaks K-645/1) with EVAL-

ADF4158EB1Z barcode label

Wrapping material (antistatic bubble wrap)

DIGITAL PICTURE OF THE EVALUATION BOARD

Figure 1.

08972-001

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

UG-123 Evaluation Board User Guide

TABLE OF CONTENTS

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

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

Evaluation Kit Contents ................................................................... 1

Digital Picture of the Evaluation Board ......................................... 1

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

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

Overview ........................................................................................ 3

Power Supplies .............................................................................. 3

Loop Filter ..................................................................................... 3

REVISION HISTORY

5/10—Revision 0: Initial Version

Local Oscillator Components ......................................................3

Evaluation Setup ................................................................................4

Evaluation Board Software ...............................................................5

Main Window ................................................................................5

Ramp Setup Window ....................................................................5

Evaluation Board Schematic ............................................................8

Ordering Information .................................................................... 11

Bill of Materials ........................................................................... 11

Rev. 0 | Page 2 of 12

Evaluation Board User Guide UG-123

EVALUATION BOARD HARDWARE

OVERVIEW

The EVAL-ADF4158EB1Z is supplied with a cable for
connecting to the USB port of a PC. The silk screen for the
evaluation board is shown in Figure 2. The board schematic
is shown in Figure 7, Figure 8, and Figure 9.

It is very important to note that the AV
pins of the ADF4158 should never exceed the V
ADF4158. This can cause damage to the device.

If the user wishes, external power supplies can be used. In this
case, insert SMA connectors as shown on the silk screen (see
Figure 2) and the digital picture (see Figure 1) of the evaluation
board.

LOOP FILTER

The loop filter schematic is included in the board schematic
in Figure 7, Figure 8, and Figure 9. The loop filter component
placements are clarified in Figure 3.

, DVDD, and SDVDD

DD

pin of the

P

Figure 2. Evaluation Board Silk Screen

POWER SUPPLIES

The board is powered from a single 9 V battery. The power
supply circuitry allows the user to choose 3 V for the AV
DV

, and SDVDD pins of the ADF4158 and either 3 V or 5 V

DD

for the V
default settings are 3 V for AV
for V

pin of the ADF4158 and for the VCO supply. The

P

, DVDD, and SDVDD and 5 V

DD

.

P

DD

C3 R1

R2 C2 C1

Figure 3. Loop Filter Placement

R2A

R1A

R3

08972-003

LOCAL OSCILLATOR COMPONENTS

The 10 MHz TCXO provides the reference frequency. The
on-chip R divider should be set to 1 so that the PFD frequency
is also 10 MHz. The PLL is made up of the 10 MHz TCXO, the
ADF4158, a passive loop filter (20 kHz bandwidth), and the
VCO V940ME03 VCO from Z Communications. The output is
available at RF

08972-002

The on-board loop filter has been designed for a charge pump
current of 0.3125 mA. ADIsimPLL, a free download available at

www.analog.com/pll, can be used to design other loop filters.

,

through a standard SMA connector.

OUT

Rev. 0 | Page 3 of 12

UG-123 Evaluation Board User Guide

EVALUATION SETUP

SPECTRUM ANALYZER

9V BATTERY

ON OFF

PC

5.8GHz VCO

RF

OUT

TCXO

EVAL-ADF4158EB1Z

REF

IN

MUXOUT

ADF4158

PC CONNECTOR

08972-007

Figure 4. Evaluation Setup

Rev. 0 | Page 4 of 12