GENERAL DESCRIPTION

The AD8339 is a Quad I/Q demodulator intended to be driven by a low noise preamplifier with differential outputs; it is optimized for the LNA in the AD8332/4/5 family of VGAs. The part consists of four identical I/Q demodulators with a 4x local oscillator (LO) input that divides this signal and generates the necessary 0° and 90° phases of the internal LO that drive the mixers. The four I/Q demodulators can be used independently of each other (assuming that a common LO is acceptable) since each has a separate RF input.

FEATURES

Quad Integrated I/Q Demodulator

16 Phase Select on each Output (22.5° per step)

Quadrature Demodulation Accuracy

Phase Accuracy ±1°

Amplitude Balance ±0.25 dB

Bandwidth

4LO: LF – 100 MHz; RF: LF - 25 MHz

Baseband: determined by external filtering

Output Dynamic Range 158 dB (1 Hz Bandwidth)

LO Drive > –10 dBm (50 Ω); 200 mVpp

Supply: ±5 V

Power Consumption 73 mW/channel (290 mW total)

Power Down via SPI (Each Channel and Complete Chip)

APPLICATIONS

Medical Imaging (CW Ultrasound Beamforming)

Phased Array Systems

Radar

Adaptive Antennas

Communication Receivers