ADL5523ACPZ-R7 datasheet(16/24 Pages) AD

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ADL5523

Rev. A | Page 16 of 24

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.

1 VBIAS

2RFIN

3NC

4NC

RFOUT

VPOS

ADL5523

RFIN

RFOUT

TR2

TR1

100nF

VPOS

GND

Figure 52. ADL5523 Basic Connections

Table 6. ADL5523 Performance at VPOS = 5 V, 25°C with

R2 = 8.2 Ω and R1 = 600 Ω

Frequency

(MHz)

Noise

Figure (dB)

Gain

(dB)

P1dB

(dBm)

OIP3 (dBm)

(POUT = 0 dBm)

900

0.8

21.5

20.3

32.5

1950

1.0

17.0

20.7

34.0

2600

0.9

13.5

20.5

35.0

3500

1.0

11.3

20.1

35.0

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