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
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