ANALOG DEVICES ADA4302-4 Service Manual

www.BDTIC.com/ADI

Active RF Splitter

FEATURES

Single 5 V supply
54 MHz to 865 MHz CATV operating range

4.6 dB of gain per output channel

4.4 dB noise figure
25 dB isolation between output channels

−16 dB input return loss
CSO of −73 dBc (135 channels, 15 dBmV per tone)
CTB of −66 dBc (135 channels, 15 dBmV per tone)

1.3 GHz, −3 dB bandwidth

APPLICATIONS

Cable set-top boxes
Home gateways
CATV distribution systems
Cable splitter modules

GENERAL DESCRIPTION

The ADA4302-4 is used as an active element in applications
where a lossless signal split is required. Typical applications
include multituner cable set-top boxes, cable splitter modules,
multituner televisions, and home gateways where traditional
solutions have consisted of discrete passive splitters followed by
separate fixed gain amplifiers. The ADA4302-4 is a low cost
alternative solution that simplifies designs and improves system
performance by integrating a signal splitter element and gain
element into a single IC solution.

The ADA4302-4 features four differential outputs. The

ferential architecture allows systems designed with the

dif
ADA4302-4 to maintain excellent linearity throughout the
CATV band. The ADA4302-4 can also be configured for
applications that require fewer than four outputs. Outputs
can be configured independently from one another.

J1

–55

–60

–65

–70

CSO (dBc)

–75

–80

ADA4302-4

FUNCTIONAL BLOCK DIAGRAM

VCC

+

GND

VCC

ILN
VIP

GND

VCC

TA = +85°C

T

A

SPLITTER

VIN

ILP

GND

Figure 1.

TA = +25°C

= –40°C

VON4

VOP4

VON3

VOP3

VON2

VOP2

VON1

VOP1

05017-016

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

–85

50 1000

Figure 2. Composite Second-Order (CSO) vs. Frequency

100

FREQUENCY (MHz)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2005 Analog Devices, Inc. All rights reserved.

05017-008

ADA4302-4

www.BDTIC.com/ADI

TABLE OF CONTENTS

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

Typical Perf or m ance C h a r a cter i s tics ..............................................6

Applications....................................................................................... 1

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

Functional Block Diagram .............................................................. 1

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

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

REVISION HISTORY

9/05—Rev. SpA to Rev. B

Updated Format..................................................................Universal

Changes to Circuit Description Section........................................ 8

5/05—Rev. Sp0 to Rev. SpA

hanges to Format .............................................................Universal

C

Changes to Features.......................................................................... 1

Changes to Figure 1 and Figure 2................................................... 1

Changes to Table 1............................................................................ 3

Changes to Figure 4 and Figure 5................................................... 6

Changes to Applications Section .................................................... 8

Applications........................................................................................8

Circuit Description .......................................................................8

Evaluation Boards .........................................................................8

RF Layout Considerations............................................................8

Power Supply..................................................................................8

Outline Dimensions ....................................................................... 11

Ordering Guide .......................................................................... 11

10/04—Revision Sp0: Initial Version

Rev. B | Page 2 of 12

ADA4302-4

www.BDTIC.com/ADI

SPECIFICATIONS

VCC = 5 V, RIN = RL = 75 Ω, TA = 25°C, unless otherwise noted. The ADA4302-4 is characterized using a balun1 at the input.

Table 1.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

Bandwidth (−3 dB) 1300 MHz
Specified Frequency Range 54 865 MHz
Gain (S21) f = 100 MHz 3.5 4.6 5.7 dB
Gain Flatness f = 865 MHz 1 dB

NOISE/DISTORTION PERFORMANCE

Composite Triple Beat (CTB) 135 Channels, 15 dBmV/Channel, f = 103.25 MHz −66 −62 dBc
Composite Second-Order (CSO) 135 Channels, 15 dBmV/Channel, f = 103.25 MHz −73 −67 dBc
Cross Modulation (CXM)

Output IP3 f1 = 97.25 MHz, f2 = 103.25 MHz 23 dBm
Output IP2 f1 = 97.25 MHz, f2 = 103.25 MHz 65 dBm
Noise Figure @ 54 MHz 4.1 4.4 dB
@ 550 MHz 4.4 4.7 dB
@ 865 MHz 5.0 5.8 dB

INPUT CHARACTERISTICS

Input Return Loss (S11) Referenced to 75 Ω
@ 54 MHz −16 −14 dB
@ 550 MHz −16 −11 dB
@ 865 MHz −18 −11 dB
Output-to-Input Isolation (S12) Any output, 54 MHz to 865 MHz −35 −33 dB

OUTPUT CHARACTERISTICS

Output Return Loss (S22) Referenced to 75 Ω
@ 54 MHz −11 −9 dB
@ 550 MHz −12.5 −10 dB
@ 865 MHz −14 −11.5 dB
Output-to-Output Isolation Between any two outputs, 54 MHz to 865 MHz −25 dB
1 dB Compression Output referred, f = 100 MHz 8 dBm

POWER SUPPLY

Nominal Supply Voltage 5 V
Quiescent Supply Current 215 240 mA

1

M/A-COM MABAES0029.

135 Channels, 15 dBmV/Channel, 100% modulation
@ 15.75 kH

z, f = 103.25 MHz

−67 −64 dBc

Rev. B | Page 3 of 12

ADA4302-4

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 5.5 V
Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +85°C
Lead Temperature (Soldering 10 sec) 300°C
Junction Temperature 150°C

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate
on the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Stresses above those listed under Absolute Maximum Rating

ma

y cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

Rev. B | Page 4 of 12