400 MHz to 2700 MHz

¼ Watt RF Driver Amplifier

Data Sheet

ADL5320

FEATURES

Operation: 400 MHz to 2700 MHz

Gain of 16.9 dB at 880 MHz

OIP3 of 45.0 dBm at 880 MHz

P1dB of 25.4 dBm at 880 MHz

Noise figure: 4.1 dB at 880 MHz

Power supply voltage: 3.3 V to 5 V

Power supply current: 44 mA to 104 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 ±4 kV (Class 3A)

APPLICATIONS

Wireless infrastructure

Automated test equipment

ISM/AMR applications

FUNCTIONAL BLOCK DIAGRAM

GND

1

2

BIAS

3

GND

ADL5320

(2)

Figure 1.

GENERAL DESCRIPTION

The ADL5320 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 ADL5320 is also rated to operate across the wide temperature

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

that experience higher temperatures, such as power amplifiers.

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 ADL5320 also delivers excellent adjacent channel power

ratio (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 reduces to 9 dBm.

–90

–80

–70

–60

–50

–40

–30

–20

–20

–15

–10

–5

0

5

10

15

20

SOURCE

Figure 2. ACPR vs. Output Power, Single Carrier W-CDMA TM1-64 at

2140 MHz

Rev. B

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