Cascadable IF VGAs with

Programmable RMS Detectors

Data Sheet

ADL5336

Rev. B

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FEATURES

Pair of VGAs with rms AGC detectors

VGA and AGC modes of operation

Continuous gain control range: 48 dB

Noise figure (NF) = 6.8 dB at maximum gain

IMD3 > 62 dBc for 1.0 V p-p composite output

Differential input and output

Multiplexed inputs for VGA2

Programmable detector AGC setpoints

Programmable VGA maximum gain

Power-down feature

Single 5 V supply operation

APPLICATIONS

Point-to-multipoint radios

Instrumentation

Medical

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The ADL5336 consists of a pair of variable gain amplifiers

(VGAs) designed for cascaded IF applications. The amplifiers

have linear-in-dB gain control and operate from low frequencies to

1 GHz. Their excellent gain conformance over the control range

and flatness over frequency are due to Analog Devices, Inc.,

patented X-AMP® architecture, an innovative technique for

implementing high performance variable gain control.

Each VGA has 24 dB of gain control range. Their maximum gain

can be independently programmable over a 6 dB range via the

SPI. The VGAs can be cascaded to provide a total range of 48 dB.

When connected to a 50 Ω source through a 1:4 balun, the gain

is 6 dB higher. The second VGA has an SPI programmable input

switch that selects one of two external inputs.

When driven from a 200 Ω source or from a 50 Ω source through

a 1:4 balun, the noise figure (NF) for the composite amplifier is

6.8 dB at maximum gain. The output of each VGA can drive

100 Ω loads to 5 V p-p maximum.

Each VGA has an independent square law detector for autonomous,

automatic gain control (AGC) operation. Each detector setpoint

can be programmed independently through the SPI from −24 dBV

to −3 dBV in 3 dB steps. When both VGAs are arranged in AGC

mode and are programmed to the same setpoint, the composite NF

increases to 9 dB when backed off by 18 dB from maximum gain.

The ADL5336 operates from a 5 V supply and consumes a typical

supply current of 80 mA. When disabled, it consumes 4 mA. It is

fabricated in an advanced silicon-germanium BiCMOS process and

is available in a 32-lead exposed paddle LFCSP package. Performance

is specified over a −40°C to +85°C temperature range.

ADL5336

VCM1

VPOS

VPOS

COM

MODE

ENBL

INP1

INM1

VPOS

VPOS

COM

SDO

DATA

OPP2

VCM2

COM

OPM2

OPP1 OPM1 IP2A IM2A COM IP2B IM2B

GAIN1 DTO1 GAIN2 DTO2 COMD VPSD

LE

CLK

SPI

VGA1

VGA2