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LTC5599 - 30MHz to 1300MHz Low Power Direct Quadrature Modulator

The LTC®5599 is a direct conversion I/Q modulator designed for low power wireless applications that enable direct modulation of differential baseband I and Q signals on an RF carrier. Single side-band modulation or side-band suppressed upconversion can be achieved by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband input ports can be either AC or DC coupled to a source with a common mode voltage level of about 1.4V. The SPI interface controls the supply current, modulator gain, and allows optimization of the LO carrier feedthrough and side-band suppression, with sine wave or square wave LO drive. A fixed LC network on the LO and RF ports covers a continuous 90MHz to 1300MHz operation. An on-chip thermometer can be activated to compensate for gain-temperature variations. More accurate temperature measurements can be made using an on-chip diode. In addition, a continuous analog gain control (VCTRL) pin can be used for fast power control.

Features Frequency Range: 30MHz to 1300MHz Low Power: 2.7V to 3.6V Supply; 28mA Low LO Carrier Leakage: –51.5dBm at 500MHz Side-Band Suppression: –52.6dBc at 500MHz Output IP3: 20.8dBm at 500MHz Low RF Output Noise Floor: –156dBm/Hz at 6MHz Offset, PRF = 3dBm Sine Wave or Square Wave LO Drive SPI Control: Adjustable Gain: –19dB to 0dB in 1dB Steps Effecting Supply Current from 8mA to 35mA I/Q Offset Adjust: –65dBm LO Carrier Leakage I/Q Gain/Phase Adjust: –60dBc Side-Band Suppressed 24-Lead QFN 4mm × 4mm Package Typical Application

Applications Wireless Microphones Battery Powered Radios Ad-Hoc Wireless Infrastructure Networks “White-Space” Transmitters Software Defined Radios (SDR) Military Radios Packaging

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