Active RF Splitter
ADA4302-4
FEATURES
Single 5 V supply
FUNCTIONAL BLOCK DIAGRAM
VCC
54 MHz to 865 MHz CATV operating range
4.6 dB of gain per output channel
4.4 dB noise figure
+
VON4
25 dB isolation between output channels
−16 dB input return loss
CSO of −89 dBc (135 channels, 15 dBmV per tone)
CTB of −81 dBc (135 channels, 15 dBmV per tone)
1.3 GHz, −3 dB bandwidth
VOP4
VON3
VOP3
GND
VCC
ILN
VIP
SPLITTER
GND
APPLICATIONS
Cable set-top boxes
Home gateways
VIN
ILP
J1
VON2
CATV distribution systems
Cable splitter modules
VOP2
VON1
VOP1
VCC
GND
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.
Figure 1.
–60
–70
–80
–90
T
= +85°C
A
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
may be configured independently from one another.
T
= +25°C
A
–100
–110
T
= –40°C
A
50
100
1000
For more information about the ADA4302-4, contact Analog
Devices, Inc. via email at high_current_drivers.com@analog.com.
FREQUENCY (MHz)
Figure 2. Composite Second-Order vs. Frequency
Rev. Sp0
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