Analog Devices EVAL-ADF4350EB2Z Manual de usuario

Evaluation Board User Guide

UG-110

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

Evaluation Board for Fractional-N/Integer-N PLL Frequency Synthesizer

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12

FEATURES

Self-contained board including PLL, VCO, loop filter (20 kHz),

10 MHz TCXO reference, USB interface, and voltage

regulators

Accompanying software allows control of synthesizer

functions from a PC

Choice of power supply via USB or external feeding

Typical phase noise performance of −99 dBc/Hz @ 1 kHz

offset from carrier (1 GHz output frequency)

GENERAL DESCRIPTION

The EVAL-ADF4350EB2Z is designed to evaluate the

performance of the ADF4350 frequency synthesizer. A

block diagram of the board is shown in Figure 1. It contains

the ADF4350 synthesizer, a USB connector and related inter-

face, a 10 MHz TCXO reference source, SMA connectors for

the RF outputs, and reference signal plus headers for various

signals and voltages. There is also a loop filter (20 kHz) on

board. A USB cable is included with the board to connect to

a PC USB port.

The package also contains Windows® software (2000- and XP-

compatible) to allow easy programming of the synthesizer.

EVALUATION KIT CONTENTS

Evaluation board software CD

USB cable

EVAL-ADF4350EB2Z

EVALUATION BOARD BLOCK DIAGRAM

HEADERS

EXTERNAL DC

SUPPLY

EXTERNAL DC

GND

HEADERS

TCXO

ADF4350

LOOP FILTER

LOCK DETECT LED

USB

POWER

LED

PLL

POWER

LED

USB POWER SWITCH

EXTERNAL POWER

SWITCH

USB

CONNECTOR

USB CRYSTAL

AND PROCESSOR

REFERENCE IN/OUT

OUT

A+

OUT

A–

OUT

B+

OUT

B−

08909-001

Figure 1.

UG-110 Evaluation Board User Guide

Rev. 0 | Page 2 of 12

TABLE OF CONTENTS

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

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

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

Evaluation Board Block Diagram................................................... 1

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

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

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

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

RF Output.......................................................................................3

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

Reference Source ...........................................................................3

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

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

Evaluation Board Schematics and Artwork...................................6

Ordering Information.................................................................... 10

Bill of Materials........................................................................... 10

REVISION HISTORY

3/10—Revision 0: Initial Version

Evaluation Board User Guide UG-110

Rev. 0 | Page 3 of 12

EVALUATION BOARD HARDWARE

OVERVIEW

The EVAL-ADF4350EB2Z comes with a cable for connecting to

the USB port of a PC. The silk screen for the evaluation board is

shown in Figure 8. The board schematic is shown in Figure 5,

Figure 6, and Figure 7.

POWER SUPPLIES

The EVAL-ADF4350EB2Z can be powered either from the

USB port or via dc power connectors (4 mm banana connec-

tors). When feeding via banana connectors, 3.75 V to 11 V is

a suitable feeding voltage. The power supply circuitry allows

the user to use one, two, or three separate LDOs to feed the

ADF4350 (using fewer LDOs increases the risk of spur

contaminated dc feeds). Consult the board schematic in

Figure 5, Figure 6, and Figure 7 to determine a suitable jumper

setting on Header J7.

An LED, D6, indicates when USB power is available, and

another LED, D5, indicates when the ADF4350 is powered.

Switch SW1 is used to power the ADF4350 from the USB port

and Switch SW2 is used to power the part from the external dc

connectors.

In case the USB processor or clock causes spurs on the RF

output signal, the user may feed the evaluation board via the

dc connectors and unplug the USB cable, thereby removing

power from the USB interface circuitry. There is also a

grounded frame surrounding the USB interface circuitry

to allow mounting of a shielding box.

The J8 to J13 connectors can be populated if the user wishes

to measure any spectral contamination on a specific dc voltage.

Otherwise, the voltages are also present on either Header J6 or

Header J7 for easy access and measurements.

RF OUTPUT

The EVAL-ADF4350EB2Z has four SMA output connectors

(dual differential output). The device is quite sensitive to

impedance unbalance. If only one port of a differential pair

is used, terminate the other with a 50 Ω load.

LOOP FILTER

The loop filter schematic is included in the board schematic on

Figure 5. The loop filter component placements are clarified in

Figure 2.

C14

R11

C12

R9C15

C13

08909-003

Figure 2. Loop Filter Placement

REFERENCE SOURCE

The 10 MHz TCXO from Fox Electronics provides the necessary

reference signal. An external REFIN may be used if desired. In

this case, disable the on-board TCXO by removing R1 and R2.

R3 can be populated with 50 Ω to adjust impedance matching

of the evaluation board to the external reference source.

UG-110 Evaluation Board User Guide

Rev. 0 | Page 4 of 12

EVALUATION SETUP

HEADERS

EXTERNAL DC

SUPPLY

EXTERNAL DC

GND

HEADERS

TCXO

ADF4350

LOOP FILTER

LOCK DETECT LED

USB

POWER

LED

PLL

POWER

LED

USB POWER SWITCH

EXTERNAL POWER

SWITCH

USB CRYSTAL

AND PROCESSOR

REFERENCE IN/OUT

SPECTRUM ANALYZER

50Ω

TERMINATION

OSCILLOSCOPE

(OPTIONAL)

08909-007

Figure 3. Evaluation Setup

Evaluation Board User Guide UG-110

Rev. 0 | Page 5 of 12

EVALUATION BOARD SOFTWARE

The control software for the EVAL-ADF4350 accompanies the

EVAL-ADF4350EB2Z on a CD. To install the software, use the

following steps:

1. Click setup.exe.

2. The install wizard guides you through the installation

process. The software is installed in a default directory

called C:/Program Files/Analog Devices/ADF4350.

3. To run the software, click the .exe file.

The main interface window appears (see Figure 4). Confirm

that USB OK is displayed on the right side of the screen. Other-

wise, the software has no connection to the evaluation board.

It is also possible to disconnect the USB by clicking the

Disconnect USB button. Should this happen, no data is sent

to the part. This function is to be used before disconnecting

the board from the USB connection. When the board is

connected again, click the USB connect button to enable the

programming of the part. This ensures the PC does not freeze

up when the USB cable is disconnected.

Use the Reference section to set the correct reference frequency

and reference frequency divider. The reference TCXO on the

evaluation board runs at 10 MHz. To force the device to operate

in integer-N mode, set the R divider so that the PFD frequency

(displayed in the Settings section) equals the channel spacing

(set in the Output Frequency section) and select the Integer-N

when possible check box (in the Options section).

The Outputs section controls the charge pump current setting,

the output power setting, and the multiplexer output setting.

Use the Output Frequency section to control the output

frequency. You may specify two frequencies, and select which

one the device operates at. For some frequencies, the device can

operate in two modes: the low end of the VCO band or the high

end, plus an extra divide by two. To control which mode is used,

select Minimum Output Divider in the Options section.

The device can be set to toggle between the two set frequencies

by selecting Alternate in the Dynamic section. The time spent

on each frequency is set in the Approximate Delay field. To

stop, click Stop. It is also possible to sweep from f1 to f2 with

the channel spacing resolution with an approximate time delay

on each frequency.

It is also possible to select Low Spur Mode or Low Noise Mode

for the frac-N mode in the Options section. You can also set the

cycle slip reduction bit.

The Settings section displays selected settings. Click Registers to

display every bit of the register settings. To download these to

the device, click Update ALL.

08909-008

Figure 4. Software Front Panel

UG-110 Evaluation Board User Guide

Rev. 0 | Page 6 of 12

EVALUATION BOARD SCHEMATICS AND ARTWORK

08909-004

Figure 5. Evaluation Board Schematic (Page 1)

Evaluation Board User Guide UG-110

Rev. 0 | Page 7 of 12

08909-005

Figure 6. Evaluation Board Schematic (Page 2)

UG-110 Evaluation Board User Guide

Rev. 0 | Page 8 of 12

8909-006

Figure 7. Evaluation Board Schematic (Page 3)

Evaluation Board User Guide UG-110

Rev. 0 | Page 9 of 12

08909-002

Figure 8. Evaluation Board Silk Screen

UG-110 Evaluation Board User Guide

Rev. 0 | Page 10 of 12

ORDERING INFORMATION

BILL OF MATERIALS

Table 1.

Qty Reference Designator Description

21 C1, C4, C5, C8, C17, C18, C21, C22, C25, C29, C53,

C54, C55, C57, C60, C61, C62, C63, C64, C65, C66

Capacitor, 0.1 μF, 10%, 0402, 16 V, X7R

13 C2, C3, C6, C7, C10, C16, C19, C20, C23, C24, C28,

C52, C56

Capacitor, 10 pF, 5%, 0402, 50 V, NPO

9 C9, C33, C36, C38, C41, C43, C46, C48, C51 Capacitor+, 22 μF, 10%, TAJ_A, 6.3 V, tantalum

10 C11, C12, C26, C27, C30, C31, C34, C39, C44, C49 Capacitor, 1 nF, 10%, 0603, 50 V, X7R

1 C13 Capacitor, 1.5 nF, 10%, 0603, 50 V, X7R

3 C14, C58, C59 Capacitor, 22 nF, 10%, 0603, 50 V, X7R

1 C15 Capacitor, 680 pF, 10%, 0603, 50 V, X7R

8 C32, C35, C37, C40, C42, C45, C47, C50 Capacitor+, 1 μF, 10%, TAJ_A, 16 V, tantalum

1 D1 LED_CHIP, light emitting diode

2 D2, D3 SS16, DO-214AC, Schottky diode, −1 A, 60 V

1 D4 Zener-diode-S, 6.8 V, 5%, SOT23, OT23

2 D5, D6 LED, LED_CHIP, light emitting diode

5 J1, J2, J3, J4, J5 SMA, SMA_CARD_EDGE_RF

2 J6, J7 HEADER-7X2POL, HEADER14-POL

6 J8 to J13 DNI, SMA_CARD_EDGE_RF

1 J14 Red, 4 mm, banana socket

1 J15 Black, 4 mm, banana socket

1 J16 USB mini-B connector (usb-otg)

4 L1, L4, L5, L8 Inductor, 0 Ω, 1%, 0603

4 L2, L3, L6, L7 Inductor, 3.9 nH, 5%, 0603, Coilcraft 0603CS

14 R1, R2, R13, R32, R33, R34, R35, R36, R37, R47,

R51, R52, R56, R58

Resistor, 0 Ω, 1%, 0603

13 R3, R5, R6, R8, R11, R14, R18, R46, R48, R53,

R54, R55, R57

Resistor, DNI, 1%, 0603

1 R4 Resistor, 4.7 kΩ, 1%, 0603

2 R7, R38 Resistor, 1 kΩ, 1%, 0603

1 R9 Resistor, 820 Ω, 1%, 0603

1 R10 Resistor, 100 Ω, 1%, 0603

1 R12 Resistor, 330 Ω, 1%, 0603

4 R15, R16, R17, R19 Resistor, 10 kΩ, 1%, 0603

8 R20, R22, R24, R26, R28, R30, R40, R42 Resistor, 220 kΩ, 1%, 0603

4 R21, R25, R29, R41 Resistor, 390 kΩ, 1%, 0603

4 R23, R27, R31, R43 Resistor, 120 kΩ, 1%, 0603

3 R39, R49, R50 Resistor, 2.2 kΩ, 1%, 0603

2 R44, R45 Resistor, 100 kΩ, 1%, 0603

2 SW1, SW2 SW_POWER, SW_SIP-3P, NKK SPST N/O momentary push button switch

9 T1 to T9 Testpoint

1 U1 ADF4350, LFCSP-32 PLL

4 U2 to U5 ADP3334 MSO8 adjustable LDO regulator

1 U6 CY7C68013-CSP, LFCSP-56, USB microcontroller

1 U7 24LC64, SO8NB, 64K I2C serial EEPROM

1 Y1 OSC_TCXO, 10.0 MHz, OSC_TCXO, FOX

1 Y2 XTAL-CM309S, 24 MHz, XTAL_CM309S, CM309S SMD crystal

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