Active RF Splitter

ADA4302-4

Rev. B

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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

differential architecture allows systems designed with the

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.

FUNCTIONAL BLOCK DIAGRAM

SPLITTER

VIN

ILP

VIP

ILN

GND

GND

J1

GND

VCC

VCC

+

VCC

VOP4

VON3

VOP3

VON2

VOP2

VON1

VOP1

VON4

Figure 1.

FREQUENCY (MHz)

–55

–85

50

1000

–70

100

–60

–65

–75

–80

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