1:2 Single-Ended, Low Cost,
Active RF Splitter
Data Sheet
ADA4304-2
Rev. A Document Feedback
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FEATURES
Ideal for CATV and terrestrial applications
Excellent frequency response
1.6 GHz, −3 dB bandwidth
1 dB flatness to 1.0 GHz
Low noise figure: 4.0 dB
Low distortion
Composite second order (CSO): −62 dBc
Composite triple beat (CTB): −72 dBc
1 dB compression point of 8.25 dBm
2.8 dB of gain per output channel
25 dB output-to-output isolation, 50 MHz to 1000 MHz
75 Ω input and outputs
Integrated output resistors
Small package size: 16-lead, 3 mm × 3 mm LFCSP
APPLICATIONS
Set-top boxes
Residential gateways
CATV distribution systems
Splitter modules
Digital cable ready (DCR) TVs
FUNCTIONAL BLOCK DIAGRAM
VIN
VOUT2
VOUT1
GND
VCC
0.01µF
IL
1µH
5
5
ADA4304-2
0.01µF
0.01µF
0.1µF0.1µF
06539-001
Figure 1.
GENERAL DESCRIPTION
The ADA4304-2 is a 75 Ω active splitter for use in applications
where a lossless signal split is required. Typical applications
include multituner digital set-top boxes, cable splitter modules,
multituner/digital cable ready (DCR) televisions, and home
gateways where traditional solutions require discrete passive
splitter modules with separate fixed gain amplifiers.
The ADA4304-2 is fabricated using Analog Devices, Inc.
proprietary silicon-germanium (SiGe), complementary bipolar
process, enabling it to achieve very low levels of distortion with
a noise figure of 4 dB. The part provides a low cost alternative
that simplifies designs and improves system performance by
integrating a signal splitter element and a gain block into a single
IC. The ADA4304-2 is available in a 16-lead LFCSP and operates
in the extended industrial temperature range of −40°C to +85°C.
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
10050 1000 4000
T
A
= –40°C
06539-011
FREQUENCY (MHz)
GAIN (dB)
T
A
= +85°C
T
A
= +25°C
Figure 2. Gain (S
21
, S
31
) vs. Frequency
