Datasheet AN-1151 Datasheet (ANALOG DEVICES)

AN-1151

Application Note

Parameter

Description

10634-001

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

Using a Johanson 2450BM14E0007 Impedance-Matched, Integrated Filter Balun

with the ADF7241 and ADF7242

by Mary O’Keefe

INTRODUCTION

This application note describes the use and performance achieved
using the Johanson Technology, Inc., 2450BM14E0007 impedance­matched (complex differential impedance value) filter balun with
the ADF7241 or ADF7242 2.4 GHz RF transceivers. The filter
balun from Johanson Technology effectively reduces the RF
front-end component count and layout space. This balun is 100%
RF tested by Johanson Tec hnol og y. The Additional Information
from Johanson Technology section provides more insight about
how harmonic emissions are attenuated, as well as further details
about the balun component.

Table

1. Key Parameters of the Filter Balun

Part Number 2450BM14E0007
Frequency 2400 MHz to 2500 MHz
Unbalanced Port Impedance 50 Ω
Balanced Port Impedance Matched to ADF7241/ADF7242

RF port impedance

TYPICAL PERFORMANCE D ATA

Tabl e 2 shows typical performance data obtained from the

ADF7241 and ADF7242 using the 2450BM14E0007 impedance-

matched filter balun.

EVALUATION BOARD LAYO UT

An outline of the RF board layout is shown in Figure 1. Gerber
files of the board layout are available on the Analog Devices, Inc.,

ADF7242 evaluation board product website. Because the imped-

ance seen by the balun is inherently dependent on the layout,
it is recommended to follow the EVAL-ADF724xDB3Z layout
as shown in the Gerber files as closely as possible for optimum
performance.

The board schematic is shown in Figure 2. Note that the C7 and
C8 capacitors are required for power amplifier stability, and the
specified 10 nF value should be used.

2. Typical Performance of the ADF7241 and ADF7242

Table
Using the 2450BM14E0007 Filter Balun

Parameter Value

Tx Output Power 3 dBm
Harmonics

4.9 GHz −50 dBm

7.35 GHz −47 dBm

Figure 1. EVAL-ADF724xDB3Z Board Layout Highlighting Balun Location

Rev. 0 | Page 1 of 8

AN-1151 Application Note

TABLE OF CONTENTS

Introduction ...................................................................................... 1

Typical Performance Data ............................................................... 1

Evaluation Board Layout ................................................................. 1

REVISION HISTORY

5/12—Revision 0: Initial Version

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

Evaluation Board Schematic ............................................................3

Additional Information from Johanson Technology ....................4

Rev. 0 | Page 2 of 8

Application Note AN-1151

10634-002

EVALUATION BOARD SCHEMATIC

Figure 2. EVAL-ADF724xDB3Z Schematic

Rev. 0 | Page 3 of 8

AN-1151 Application Note

2.4 GHz Impedance-Matched Balun-Filter Integrated Passive for ADF7241 and AADF7242

P/N 2450BM14E0007

Detai l Specification:

Page 1 of 3

Gen eral Speci f icati on s

Part Number Insertion Loss
Frequency (MHz) Return Loss

Unbalanced Impedance (Antenna Out)

Phase Difference

Amplitude Difference

Reel Quanity
Operating Temperature

Power Capacity

Packaging

Bulk Suffix = S

Eg. 2450BM14E0007S

P/N

Style

T & R (Paper)

Suffix = E Eg. 2450BM14E0007T

Suffix

AgPt Suffix = None

Eg. 2450BM14E0007(S or T)

No. Function

1

Mechani cal Di mension s

2

In mm 3

L ± ± 4
W ± ± 5
T ± ± 6
a ± ±
b
c ± ±
g ± ±
p ± ±

Mounting Considerations

Mount these devices with brown mark facing up.

Units: mm

SAC 305 Solder Paste Recommended

Units: mm

Johanson Technology, Inc. reserves the right to make design changes w ithout notice.

All sales are subject to Johanson Technology, Inc. terms and conditions.

www.johansontechnology.com

4001 Calle Tecate • Camarillo, CA 93012 • TEL [phone] FAX [phone]2

2012 Johanson Technology, Inc. All Rights Reserved

5/15/2012

Attenuation (dB)

25min.@4800~5000MHz
25min.@7200~7500MHz

0.012

0.004

0.30

0.10

0.004

0.063

1.60

0.10

0.10

0.80

0.031

0.004

Balanced Differential Impedance

*

Line w idth should be designed to provide 50 Ω

impedance matching characteristics.

0.020

0.002

0.10

0.50

0.05

0.024

0.006

0.15

+.004/-.006

+0.1/-0.15

0.004

0.10

0.008

0.008

0.004

0.20

0.10

0.20

GND

Unbalanced Port

0.60

GND

GND

Balanced Port

Balanced Port

0.004

1.5 dB max.

50 Ω

2400 - 2500

2450BM14E0007

Termination Style

2W max.

Conjugate m atch to ADI

ADF7241 and ADF7242

4,000

2.0 dB max.

180° ± 10°

9.5 dB min.

-40 to +85°C

Recommended Storage
Temperature

+5 to +35°C, Humidity:

45-75%RH, 18 mos. Max *

Terminal Configuration

L

W

c

a p

g

b

T

1

2

3

4

5
6

High Freq uency Ceramic S olution s

Land

Solder Resist

Through-hole

( f 0.2/ 0.35)

*18 months i n vacuum s eal ed bag and 1 week cumulat i ve after opened. For more i nfo g o to www.johansontechnology.c om/silverleads .ht ml

*

0.55

0.25

0.3

0.25

ADF724X

10nF caps (f or
DC-Block)

ADDITIONAL INFORMATION FROM JOHANSON TECHNOLOGY

The following content and logos are provided courtesy of Johanson Technology, Inc. Johanson Technology is an independent corporation
and is not owned by, controlled by, or an affiliate of Analog Devices, Inc. Analog Devices, Inc., makes no representations or warranties
with respect to the Johanson 2450BM14E007 or any other Johanson Technology products.

Rev. 0 | Page 4 of 8

Application Note AN-1151

Preliminary

2.4 GHz Impedance-Matched Balun-Filter Integrated Passive for ADF7242 P/N 2450BM14E0007

Detail Specificati on: 02/15/12 Page 2 of 3

Layout Details

Johanson Technology, Inc. reserves the right to make design changes without noti ce.

All sales are subject t o Johanson Technology, Inc. terms and conditions.

www.johansontechnology.com

4001 Calle Tecate • Camarillo, CA 93012 • TEL [phone] FAX [phone]

2012 Johanson Technology, Inc. All Rights Reserved

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High Frequency Ceramic Solutions

Rev. 0 | Page 5 of 8

AN-1151 Application Note

Preliminary

2.4 GHz Impedance-Matched Balun-Filter Integrated Passive for ADF7242 P/N 2450BM14E0007

Detail Specificati on: 02/15/12 Page 3 of 3

Typical Electrical Performance (T=25°C)

Actual Picture:

Johanson Technology, Inc. reserves the right to make design changes without noti ce.

All sales are subject t o Johanson Technology, Inc. terms and conditions.

www.johansontechnology.com

4001 Calle Tecate • Camarillo, CA 93012 • TEL [phone] FAX [phone]

2012 Johanson Technology, Inc. All Rights Reserved

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)

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High Frequency Ceramic Solutions

3 4 5 6 72 8

-40

-30

-20

-10

-50

0

freq, GHz

dB(IL)

dB(RL)

2.52.0 3.0

-10

0

10

-20

20

-100

0

100

-200

200

freq, GHz

dif_Amplitude

dif_Phase

Insertion Loss

Return Loss

Rev. 0 | Page 6 of 8

Application Note AN-1151

NOTES

Rev. 0 | Page 7 of 8

AN-1151 Application Note

©2012 Analog Devices, Inc. All rights reserved. Trademarks and

NOTES

registered trademarks are the property of their respective owners.
AN10634-0-5/12(0)

Rev. 0 | Page 8 of 8