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Overview

The LTC5589IUF is a direct conversion I/Q modulator designed for low power wireless applications that enables direct modulation of differential baseband I and Q signals on a single RF carrier. Single sideband modulation or sideband suppressed upconversion can be achieved by applying a 90° phase shift signal to the I and Q inputs. The I/Q baseband input port AC or DC can be coupled to a power supply with a common mode voltage level of approximately 1.4V. The SPI interface controls the power supply current, modulator gain, and provides regulation of I and Q gain and phase imbalance to optimize LO carrier feedthrough and sideband rejection. The LO port can be driven by sine wave or square wave LO drivers. A fixed LC network on the LO and RF ports covers the operating range from 700MHz to 6GHz. An on-chip thermometer can be activated to compensate for gain-temperature changes.

The LTC5589 uses an on-chip diode for more accurate temperature measurements. In addition, a continuous analog gain control (VCTRL) pin can be used for fast power control.

Key Features

Frequency range: 700MHz to 6GHz

Low power: 2.7V to 3.6V power supply 29.5 mA

Low LO carrier leakage: -43dbm at 1.8GHz

Sideband suppression: -50 DBC at 1.8GHz

Output IP3:19dBm at 1.8GHz

Low RF output noise level: -157dBm/Hz (at 30MHz offset, PRF = 1.8dBm, fRF = 2.17GHz)

Sine wave or square wave LO drive

SPI control:

Adjustable gain: 19dB (1dB step)

Generated power supply current: 9mA to 39mA

I/Q offset adjustment: -64dbm LO carrier leak

I/Q gain/phase adjustment: -1DBC sideband suppression

24-pin 4mm x 4mm plastic QFN package

Application field

The LTC5589IUF is suitable for a wide range of wireless applications, including:

Wireless microphone

Battery operated radio device

Vector modulator

Transmitters from 2.45GHz to 5.8GHz

Software Defined Radio (SDR)

Military radio