GENERAL DESCRIPTION

The AD8333 is a dual-phase shifter and I/Q demodulator that enables coherent summing and phase alignment of multiple analog data channels. It is the first solid-state device suitable for beamformer circuits, such as those used in high performance medical ultrasound equipment featuring CW Doppler. The RF

inputs interface directly with the outputs of the dual-channel, low noise preamplifiers included in the AD8332.

FEATURES

Dual integrated I/Q demodulator

16 phase select on each output (22.5° per step)

Quadrature demodulation accuracy

Phase accuracy: ±0.1°

Amplitude balance: ±0.05 dB

Bandwidth

4 LO: 100 kHz to 200 MHz

RF: dc to 50 MHz

Baseband: determined by external filtering

Output dynamic range: 161 dB/Hz

LO drive > 0 dBm (50 Ω); 4 LO > 1 MHz

Supply: ±5 V

Power consumption: 190 mW/channel (380 mW total)

Power down

APPLICATIONS

Medical imaging (CW ultrasound beamforming)

Phased array systems (radar and adaptive antennas)

Communication receivers