ADL5523_09 AD [Analog Devices], ADL5523_09 Datasheet - Page 16

• Manufacturer Part Number: ADL5523_09
• Description: 400 MHz to 4000 MHz Low Noise Amplifier
• Manufacturer: AD [Analog Devices]

ADL5523
BASIC CONNECTIONS
The basic connections for operating the ADL5523 are shown in
Figure 52. Capacitor C5 provides the power supply decoupling.
Inductor L1 (Coilcraft 0403HQ or 0402HP series) and Capacitor C1
(Murata High-Q GJM series or equivalent) provide the input
impedance matching, and the output impedance matching is
provided by either L2 or C3. Resistor R1 is used to set the supply
current, and the value of R1 is indirectly proportional to the
supply current (that is, increasing the value of R1 reduces the
supply current). The recommended external components for
selected frequencies are listed in Table 7.
For 5 V applications where the input power exceeds the input
compression point of approximately 7 dBm, a series resistor
(R2) of at least 8 Ω, with a high power rating (0.2 W minimum),
should be inserted on the VPOS line to protect the device from
the input power overdrive. In this case, reduce Resistor R1 from
1.3 kΩ to 600 Ω to keep the supply current at around 60 mA.
With R2 = 8.2 Ω (Susumu RP1608S-8R2-F) and R1 = 600 Ω, the
gain and noise figure for the ADL5523 are mostly unchanged.
Table 6 lists OIP3 and P1dB at selected frequencies. For 3 V
power supply applications, a series resistor is not necessary for
the expected input overdrive powers up to 20 dBm.
Rev. A | Page 16 of 24
Table 6. ADL5523 Performance at VPOS = 5 V, 25°C with
R2 = 8.2 Ω and R1 = 600 Ω
Frequency
(MHz)
900
1950
2600
3500
RFIN
C1
L1
Noise
Figure (dB)
0.8
1.0
0.9
1.0
Figure 52. ADL5523 Basic Connections
1 VBIAS
2 RFIN
3 NC
4 NC
ADL5523
R1
Z1
Gain
(dB)
21.5
17.0
13.5
11.3
RFOUT
VPOS
NC
NC
VPOS
8
7
6
5
P1dB
(dBm)
20.3
20.7
20.5
20.1
TR1
TR2
R2
L2
100nF
W1
C5
C3
OIP3 (dBm)
(P
32.5
34.0
35.0
35.0
RFOUT
OUT
= 0 dBm)
GND