1:3 and 1:4 Single-Ended, Low Cost,
Active RF Splitters
ADA4304-3/ADA4304-4
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
5V
5V
Ideal for CATV and terrestrial applications
2.4 GHz, −3 dB bandwidth
0.1µF
0.1µF
1 dB flatness: 54 MHz to 865 MHz
Low noise figure: 4.6 dB
1µH
Low distortion
VCC
IL
Composite second-order (CSO): −62 dBc
Composite triple beat (CTB): −72 dBc
Nominal 3 dB gain per output channel
25 dB output-to-output isolation, 50 MHz to 1000 MHz
75 Ω input and outputs
VOUT1
0.01µF
0.01µF
0.01µF
VOUT2
VOUT3
VIN
ADA4304-3
0.01µF
Small package size: 16-lead, 3 mm × 3 mm LFCSP
GND
APPLICATIONS
Set-top boxes
Residential gateways
CATV distribution systems
Splitter modules
Figure 1.
5V
5V
Digital cable ready (DCR) TVs
0.1µF
0.1µF
1µH
VCC
IL
VOUT1
0.01µF
0.01µF
0.01µF
VOUT2
VOUT3
VIN
ADA4304-4
0.01µF
VOUT4
0.01µF
GND
Figure 2.
GENERAL DESCRIPTION
The ADA4304-3/ADA4304-4 are 75 Ω active splitters for use in
applications where a lossless signal split is required. Typical
applications include multituner digital set-top boxes, cable
splitter modules, multituners/digital cable ready (DCR)
televisions, and home gateways where traditional solutions
require discrete passive splitter modules with separate fixed
gain amplifiers.
The ADA4304-3/ADA4304-4 are fabricated using the Analog
Devices, Inc., proprietary silicon germanium (SiGe),
complementary bipolar process, enabling them to achieve very
low levels of distortion with a noise figure of 4.6 dB. The parts
provide low cost alternatives that simplify designs and improve
system performance by integrating a signal splitter element and
a gain block into a single IC. The ADA4304-3/ADA4304-4 are
available in a 16-lead LFCSP and operate in the extended
industrial temperature range of −40°C to +85°C.
Rev. 0
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