50 MHz to 2200 MHz

Quadrature Modulator

ADL5385

Rev. 0

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FEATURES

Output frequency range: 50 MHz to 2200 MHz

1 dB output compression: 11 dBm @ 350 MHz

Noise floor: –159 dBm/Hz @ 350 MHz

Sideband suppression: −50 dBc @ 350 MHz

Carrier feedthrough: −46 dBm @ 350 MHz

Single supply: 4.75 V to 5.5 V

24-lead, Pb-free LFCSP_VQ with exposed paddle

APPLICATIONS

Radio-link infrastructure

Cable modem termination systems

Wireless infrastructure systems

Wireless local loop

WiMAX/broadband wireless access systems

FUNCTIONAL BLOCK DIAGRAM

TEMPERATURE

SENSOR

BIAS

VOUT

TEMP

ENBL

IBBP

IBBN

QBBP

QBBN

LOIP

LOIN

DIVIDE-BY-2

QUADRATURE

PHASE

SPLITTER

Figure 1.

PRODUCT DESCRIPTION

The ADL5385 is a silicon, monolithic, quadrature modulator

designed for use from 50 MHz to 2200 MHz. Its excellent phase

accuracy and amplitude balance enable both high performance

intermediate frequency (IF) and direct radio frequency (RF)

modulation for communication systems.

The AD5385 takes the signals from two differential baseband

inputs and modulates them onto two carriers in quadrature

with each other. The two internal carriers are derived from

a single-ended, external local oscillator input signal at twice the

frequency as the desired carrier output. The two modulated

signals are summed together in a differential-to-single-ended

amplifier designed to drive 50 Ω loads.

The ADL5385 can be used as either an IF or a direct-to-RF

modulator in digital communication systems. The wide

baseband input bandwidth allows for either baseband drive or

drive from a complex IF. Typical applications are in radio-link

transmitters, cable modem termination systems, and broadband

wireless access systems.

The ADL5385 is fabricated using the Analog Devices, Inc.,

advanced silicon germanium bipolar process and is packaged in

a 24-lead, Pb-free LFCSP_VQ with exposed paddle.

Performance is specified over –40°C to +85°C. A Pb-free

evaluation board is also available.