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ADA4304-4 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADA4304-4
Beschreibung Active RF Splitters
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 11 Seiten
ADA4304-4 Datasheet, Funktion
Data Sheet
1:3 and 1:4 Single-Ended, Low Cost,
Active RF Splitters
ADA4304-3/ADA4304-4
FEATURES
Ideal for CATV and terrestrial applications
2.4 GHz, −3 dB bandwidth
1 dB flatness: 54 MHz to 865 MHz
Low noise figure: 4.6 dB
Low distortion
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
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 DIAGRAMS
5V 5V
0.1µF
0.1µF
1µH
VCC
IL
0.01µF
VIN ADA4304-3
GND
VOUT1
VOUT2
VOUT3
0.01µF
0.01µF
0.01µF
Figure 1.
5V 5V
0.1µF
0.1µF
1µH
VCC
IL
0.01µF
VIN ADA4304-4
GND
VOUT1
VOUT2
VOUT3
VOUT4
0.01µF
0.01µF
0.01µF
0.01µF
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.
Figure 2.
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. A
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






ADA4304-4 Datasheet, Funktion
ADA4304-3/ADA4304-4
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 5 V, 75 Ω system, TA = 25°C, unless otherwise noted.
–54
–56
–58
–60
–62
TA = +25°C
TA = +85°C
–64
–66
TA = –40°C
–68
–70
–72
–74
50
100
1000
FREQUENCY (MHz)
Figure 6. Composite Second Order (CSO) vs. Frequency
–60
–63
–66
–69
TA = +85°C
–72
–75 TA = +25°C
–78
TA = –40°C
–81
–84
–87
–90
50
100
FREQUENCY (MHz)
Figure 7. Composite Triple Beat (CTB) vs. Frequency
1000
–60
–63
–66
–69 TA = +85°C
–72 TA = +25°C
–75
–78 TA = –40°C
–81
–84
–87
–90
50
100
FREQUENCY (MHz)
Figure 8. Cross Modulation (CXM) vs. Frequency
1000
Data Sheet
10
50SYSTEM
8
6 TA = +85°C
TA = +25°C
4
TA = –40°C
2
0
50 100
FREQUENCY (MHz)
Figure 9. Noise Figure vs. Frequency
60
55
50
ADA4304-3
45
40
ADA4304-4
35
30
25
20
50
100
FREQUENCY (MHz)
Figure 10. Output IP2 vs. Frequency
40
35
30
ADA4304-3
25
20 ADA4304-4
15
10
5
0
50 100
FREQUENCY (MHz)
Figure 11. Output IP3 vs. Frequency
1000
1000
1000
Rev. A | Page 6 of 11

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