2.3 GHz to 4.0 GHz

¼ Watt RF Driver Amplifier

Data Sheet

ADL5321

Rev. D

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FEATURES

Operation: 2.3 GHz to 4.0 GHz

Gain of 14.0 dB at 2.6 GHz

OIP3 of 41.0 dBm at 2.6 GHz

P1dB of 25.7 dBm at 2.6 GHz

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

No bias resistor required

Thermally efficient, MSL-1 rated SOT-89 package

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

ESD rating of ±2 kV (Class 3A)

APPLICATIONS

Wireless infrastructure

Automated test equipment

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

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 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 ¼ watt driver amplifier covers the 2.3 GHz to

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.

The ADL5321 also delivers excellent adjacent channel leakage

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.

Figure 2. WiMAX 64 QAM, 10 MHz Bandwidth, Single Carrier

RFIN

GND

RFOUT

1

2

BIAS

3

GND

ADL5321

(2)

–30

–40

–50

–60

–70

–80

–90

–10

–5

0

5

10

15

20

ADJ CH LOW 2.6 GHZ

ALT CH LOW 2.6 GHZ

ADJ CH LOW 3.5 GHZ

ALT CH UP 3.5 GHZ