400 MHz to 4000 MHz
½ Watt RF Driver Amplifier
Data Sheet
ADL5324
FEATURES
FUNCTIONAL BLOCK DIAGRAM
GND
Operation from 400 MHz to 4000 MHz
Gain of 14.6 dB at 2140 MHz
(2)
ADL5324
OIP3 of 43.1 dBm at 2140 MHz
P1dB of 29.1 dBm at 2140 MHz
Noise figure of 3.8 dB
BIAS
1
2
3
Dynamically adjustable bias
RFIN
GND RFOUT
Adjustable power supply bias: 3.3 V to 5 V
Low power supply current: 62 mA to 133 mA
No bias resistor needed
Figure 1.
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
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 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.
–30
–35
–40
–45
–50
–55
SOURCE
–60
V
V
= 3.3V
= 5V
CC
–65
–70
–75
–80
–85
CC
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.
–20
–15
–10
–5
0
5
10
15
20
25
P
(dBm)
OUT
Figure 2. ACPR vs. Output Power, Single Carrier W-CDMA,
TM1-64 at 2140 MHz
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062−9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2012 Analog Devices, Inc. All rights reserved.
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