2.3 GHz to 4.0 GHz
¼ Watt RF Driver Amplifier
Data Sheet
ADL5321
FEATURES
Operation: 2.3 GHz to 4.0 GHz
Gain of 14.0 dB at 2.6 GHz
FUNCTIONAL BLOCK DIAGRAM
GND
(2)
OIP3 of 41.0 dBm at 2.6 GHz
P1dB of 25.7 dBm at 2.6 GHz
ADL5321
Noise figure: 4.0 dB at 2.6 GHz
Power supply voltage: 3.3 V to 5 V
Power supply current: 37 mA to 90 mA
Dynamically adjustable bias
BIAS
1
2
3
RFIN
GND RFOUT
No bias resistor required
Thermally efficient, MSL-1 rated SOT-89 package
Operating temperature range: −40°C to +105°C
Figure 1.
ESD rating of 2 kV (Class 3A)
APPLICATIONS
Wireless infrastructure
Automated test equipment
ISM/AMR applications
GENERAL DESCRIPTION
The ADL5321 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 can
reduce the 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 22 dBm to
26 dBm output power levels.
The ADL5321 also delivers excellent adjacent channel leakage
ratio (ACLR) vs. POUT. For output powers up to 10 dBm rms, the
ADL5321 adds very little distortion to the output spectrum. At
2.6 GHz, the ACLR is −59 dB and a relative constellation error of
−46.6 dB (<0.5% EVM) at an output power of 10 dBm rms.
–30
ADJ CH LOW 2.6 GHZ
ALT CH LOW 2.6 GHZ
ADJ CH LOW 3.5 GHZ
–40
ALT CH UP 3.5 GHZ
–50
–60
–70
–80
–90
The ADL5321 is also rated to operate across the wide temper-
ature range of −40°C to +105°C for reliable performance in
designs that experience higher temperatures, such as power
amplifiers. The
1
∕ watt driver amplifier covers the 2.3 GHz to
4
–10
–5
0
5
10
15
20
4.0 GHz wide frequency range 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.
P
(dBm)
OUT
Figure 2. WiMAX 64 QAM, 10 MHz Bandwidth, Single Carrier
Rev. C
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
rightsof third parties that may result fromits 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 andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2008–2012 Analog Devices, Inc. All rights reserved.
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