10 MHz to 3 GHz VGA with

60 dB Gain Control Range

Data Sheet

ADL5330

Rev. B

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FEATURES

Voltage controlled amplifier/attenuator

Operating frequency 10 MHz to 3 GHz

Optimized for controlling output power

High linearity: OIP3 31 dBm at 900 MHz

Output noise floor: −150 dBm/Hz at 900 MHz

50 Ω input and output impedances

Single-ended or differential operation

Wide gain control range: −34 dB to +22 dB at 900 MHz

Linear in dB gain control function, 20 mV/dB

Single-supply 4.75 V to 5.25 V

APPLICATIONS

Transmit and receive power control at RF and IF

FUNCTIONAL BLOCK DIAGRAM

INLO

VPS1

COM1

INHI

COM2

OPLO

OPHI

IPBS

GAIN

CONTROL

BIAS

AND

VREF

GAIN

BALUN

COM2

RFOUT

COM2

VPS2

VPS2

VPS2

COM1

VPS1

VPS2

VPS2

COM2

COM1

OPBS

VREF

ENBL

VPS2

RFIN

INPUT

GM

STAGE

O/P

(TZ)

STAGE

Figure 1.

GENERAL DESCRIPTION

The ADL5330 is a high performance, voltage controlled, variable

gain amplifier (VGA)/attenuator for use in applications with

frequencies up to 3 GHz. The balanced structure of the signal

path minimizes distortion while it also reduces the risk of

spurious feedforward at low gains and high frequencies caused

by parasitic coupling. While operation between a balanced source

and load is recommended, a single sided input is internally

converted to differential form.

The input impedance is 50 Ω from INHI to INLO. The outputs

are usually coupled into a 50 Ω grounded load via a 1:1 balun. A

single supply of 4.75 V to 5.25 V is required.

The 50 Ω input system converts the applied voltage to a pair of

differential currents with high linearity and good common

rejection even when driven by a single sided source. The signal

currents are then applied to a proprietary voltage controlled

attenuator providing precise definition of the overall gain under

the control of the linear in dB interface. The GAIN pin accepts a

voltage from 0 V at minimum gain to 1.4 V at full gain with a

20 mV/dB scaling factor.

The output of the high accuracy wideband attenuator is applied

to a differential transimpedance output stage. The output stage

sets the 50 Ω differential output impedances and drives the

OPHI and OPLO pins. The ADL5330 has a power-down

function. It can be powered down by a Logic LO input on the

ENBL pin. The current consumption in power-down mode is

250 μA.

The ADL5330 is fabricated on an Analog Devices, Inc.,

proprietary high performance, complementary bipolar IC process.

The ADL5330 is available in a 24-lead (4 mm × 4 mm), Pb-free

LFCSP package and is specified for operation from ambient

temperatures of −40°C to +85°C. An evaluation board is also

available.