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