400 MHz to 4000 MHz

½ Watt RF Driver Amplifier

Data Sheet

ADL5324

Rev. 0

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FEATURES

Operation from 400 MHz to 4000 MHz

Gain of 14.6 dB at 2140 MHz

OIP3 of 43.1 dBm at 2140 MHz

P1dB of 29.1 dBm at 2140 MHz

Noise figure of 3.8 dB

Dynamically adjustable bias

Adjustable power supply bias: 3.3 V to 5 V

Low power supply current: 62 mA to 133 mA

No bias resistor needed

Operating temperature range of −40°C to +105°C

SOT-89 package, MSL-1 rated

ESD rating of ±3 kV (Class 2)

APPLICATIONS

Wireless infrastructure

Automated test equipment

ISM/AMR applications

FUNCTIONAL BLOCK DIAGRAM

GND

1

2

BIAS

3

GND

ADL5324

(2)

RFIN

RFOUT

Figure 1.

GENERAL DESCRIPTION

The ADL5324 incorporates a dynamically adjustable biasing

circuit that allows for the customization of OIP3 and P1dB

performance from 3.3 V to 5 V, without the need for an external

bias resistor. This feature gives the designer the ability to tailor

driver amplifier performance to the specific needs of the design.

This feature also creates the opportunity for dynamic biasing of

the driver amplifier where a variable supply is used to allow for

full 5 V biasing under large signal conditions, and then reduced

supply voltage when signal levels are smaller and lower power

consumption is desirable. This scalability reduces the need to

evaluate and inventory multiple driver amplifiers for different

output power requirements, from 25 dBm to 29 dBm output

power levels.

The ADL5324 is also rated to operate across the wide temp-

erature range of −40°C to +105°C for reliable performance

in designs that experience higher temperatures, such as power

amplifiers. The ½ W driver amplifier also covers the wide

frequency range of 400 MHz to 4000 MHz, and only requires

a few external components to be tuned to a specific band within

that wide range. This high performance broadband RF driver

amplifier is well suited for a variety of wired and wireless

applications, including cellular infrastructure, ISM band power

amplifiers, defense equipment, and instrumentation equipment.

A fully populated evaluation board is available.

The ADL5324 also delivers excellent ACPR vs. output power

and bias voltage. The driver can deliver greater than 17 dBm

of output power at 2140 MHz, while achieving an ACPR of

−55 dBc at 5 V. If the bias is reduced to 3.3 V, the −55 dBc

ACPR output power only minimally reduces to 15 dBm.

–85

–80

–75

–70

–65

–60

–55

–50

–45

–40

–35

–30

–20

–15

–10

–5

0

5

10

15

20

25

SOURCE

Figure 2. ACPR vs. Output Power, Single Carrier W-CDMA,

TM1-64 at 2140 MHz