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ADA4303-2ACPZ-RL

P1-P3P4-P6P7-P9P10-P12P13-P13
ADA4303-2 Data Sheet
Rev. A | Page 6 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
–50
–53
–56
–59
–62
–65
–68
–71
–74
–77
–80
50 100 1000
CSO (dBc)
FREQUENCY (MHz)
T
A
= +25°C
T
A
= +85°C
T
A
= –40°C
06364-004
Figure 5. Composite Second-Order (CSO) vs. Frequency
–60
–63
–66
–69
–72
–75
–78
–81
–84
–87
–90
50 100 1000
CTB (dBc)
FREQUENCY (MHz)
T
A
= +25°C
T
A
= –40°C
06364-005
T
A
= +85°C
Figure 6. Composite Triple Beat (CTB) vs. Frequency
–60
–63
–66
–69
–72
–75
–78
–81
–84
–87
–90
50 100 1000
CXM (dBc)
FREQUENCY (MHz)
T
A
= +25°C
T
A
= +85°C
T
A
= –40°C
06364-006
Figure 7. Cross Modulation (CXM) vs. Frequency
10
2
4
6
8
0
50 100 1000
NOISE FIGURE (dB)
FREQUENCY (MHz)
T
A
= +25°C
T
A
= +85°C
T
A
= –40°C
06364-007
Figure 8. Noise Figure vs. Frequency
60
55
50
45
40
35
30
25
20
50 100 1000
OUTPUT IP2 (dBm)
FREQUENCY (MHz)
06364-008
Figure 9. Output IP2 vs. Frequency
40
35
30
25
20
15
10
5
0
50 100 1000
OUTPUT IP3 (dBm)
FREQUENCY (MHz)
06364-009
Figure 10. Output IP3 vs. Frequency
Data Sheet ADA4303-2
Rev. A | Page 7 of 12
4
3
2
1
0
–1
–2
–3
–4
–5
–6
–7
–8
50
100
40001000
GAIN (dB)
FREQUENCY (MHz)
T
A
= +85°C
T
A
= +25°C
T
A
= –40°C
06364-010
Figure 11. Gain (S21) vs. Frequency
–30
–31
–32
–33
–34
–35
–36
–37
–38
–39
–40
50 100
40001000
ISOLATION (dB)
FREQUENCY (MHz)
06364-011
Figure 12. Output-to-Input Isolation (S12) vs. Frequency
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
50 100 40001000
ISOLATION (dB)
FREQUENCY (MHz)
06364-012
Figure 13. Output-to-Output Isolation vs. Frequency
0
–5
–10
–15
–20
–25
–30
50 100 1000
INPUT RETURN LOSS (dB)
FREQUENCY (MHz)
06364-013
Figure 14. Input Return Loss (S11) vs. Frequency
0
–10
–20
–5
–15
–25
–30
–35
–40
50 100 1000
OUTPUT RETURN LOSS (dB)
FREQUENCY (MHz)
06364-014
Figure 15. Output Return Loss (S22) vs. Frequency
90
65
70
75
80
85
–40 –30 –20 –10 0
10 20 30
40 50 60 70 80
QUIESCENT SUPPLY CURRENT (mA)
TEMPERATURE (°C)
06364-015
–60 –50 90 100
Figure 16. Quiescent Supply Current vs. Temperature
ADA4303-2 Data Sheet
Rev. A | Page 8 of 12
APPLICATIONS INFORMATION
The ADA4303-2 active splitter is primarily intended for use
in the downstream path of television set-top boxes (STBs) that
contain multiple tuners. It is typically located directly after the
diplexer in a CATV customer premise unit. The ADA4303-2
provides a single-ended input and two single-ended outputs
that allow the delivery of the RF signal to two different signal
paths. These paths can include, but are not limited to, a main
picture tuner, a picture-in-picture (PIP) tuner, an out-of-band
(OOB) tuner, a digital video recorder (DVR), and a cable
modem (CM).
The ADA4303-2 exhibits composite second-order (CSO) and
composite triple beat (CTB) products that are −62 dBc and
−72 dBc, respectively. The use of the SiGe process also allows
the ADA4303-2 to achieve a noise figure (NF) of less than 4.5 dB.
CIRCUIT DESCRIPTION
The ADA4303-2 consists of a low noise buffer amplifier followed
by a resistive power divider. This arrangement provides 3 dB of
gain relative to the RF signal present at the input of the device.
The input and each output must be properly matched to a 75 Ω
environment for distortion and noise performance to match the
data sheet specifications. In addition, to achieve the specified gain,
a 1% 249 Ω resistor should be installed to ground on each output.
AC coupling capacitors of 0.01 µF are recommended for the
input and outputs.
A 1 µH RF choke (Coilcraft chip inductor 0805LS-102X) is
required to correctly bias internal nodes of the ADA4303-2.
It should be connected between the 5 V supply and IL (Pin 11).
EVALUATION BOARD
The ADA4303-2 evaluation board allows designers to assess the
performance of the device in particular applications. The board
includes 75 Ω coaxial connectors and 75 Ω controlled-impedance
signal traces that carry the input and output signals. Power (5 V)
is applied to the red VCC loop connector, and ground is connected
to the black GND loop connector.
The board has two 249 Ω resistors between each output and
ground that set the gain of the overall circuit to 3 dB and improve
output-to-output isolation. A schematic of the ADA4303-2
evaluation board is shown in Figure 17.
RF LAYOUT CONSIDERATIONS
Appropriate impedance matching techniques are mandatory
when designing a circuit board for the ADA4303-2. Improper
characteristic impedances on traces can cause reflections that
can lead to poor linearity. The characteristic impedance of the
signal trace from each output should be 75 Ω.
POWER SUPPLY
The 5 V supply should be applied to each of the VCC pins and
RF choke via a low impedance power bus. The power bus should
be decoupled to ground using a 10 µF tantalum capacitor and
a 0.1 µF ceramic chip capacitor located close to the ADA4303-2.
In addition, the VCC pins should be decoupled to ground with
a 0.1 µF ceramic chip capacitor located as close to each of the
pins as possible.
1
ADA4303-2
C3
0.01μF
249Ω
L1
1.0μH
VCC
GND
VCC
VIN
2
3
4 5
7
9
6
8
101112
J3
J2
J1
GND
GND
GND
GND
NIC
NIC
NIC = NO INTERNAL CONNECTION
IL
VCC
VO2
VO1
C2
0.01μF
C4
0.01μF
C5
10µF
+
C6
0.1µF
C1
0.1µF
249Ω
06364-003
Figure 17. ADA4303-2 Evaluation Board Schematic
P1-P3P4-P6P7-P9P10-P12P13-P13

ADA4303-2ACPZ-RL

Mfr. #:
Buy ADA4303-2ACPZ-RL
Manufacturer:
Analog Devices Inc.
Description:
RF Amplifier 1:2 SGL-Ended Active RF Splitter
Lifecycle:
New from this manufacturer.
Delivery:
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