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AD8333:  DC to 50 MHz, Dual I/Q Demodulator and Phase Shifter

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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.

A divide-by-4 circuit generates the internal 0° and 90° phases of the local oscillator (LO) that drive the mixers of a pair of matched I/Q demodulators.

The AD8333 can be applied as a major element in analog beamformer circuits in medical ultrasound equipment.

The AD8333 features an asynchronous reset pin. When used in arrays, the reset pin sets all the LO dividers in the same state. Sixteen discrete phase rotations in 22.5° increments can be selected independently for each channel. For example, if Channel 1 is used as a reference and the RF signal applied to Channel 2 has an I/Q phase lead of 45°, Channel 2 can be phase aligned with Channel 1 by choosing the correct code.

Phase shift is defined by the output of one channel relative to another. For example, if the code of Channel 1 is adjusted to 0000 and that of Channel 2 to 0001 and the same signal is applied to both RF inputs, the output of Channel 2 leads that of Channel 1 by 22.5°.

The I and Q outputs are provided as currents to facilitate summation. The summed current outputs are converted to voltages by a high dynamic-range, current-to-voltage (I-V) converter, such as the AD8021, configured as a transimpedance amplifier. The resultant signal is then applied to a high resolution ADC, such as the AD7665 (16 bit/570 kSPS).

The two I/Q demodulators can be used independently in other nonbeamforming applications. In that case, a transimpedance amplifier is needed for each of the I and Q outputs, four in total for the dual I/Q demodulator.

The dynamic range is 159 dB/Hz at each I and Q output, but the following transimpedance amplifier is an important element in maintaining the overall dynamic range, and attention needs to be paid to optimal component selection and design.

The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm) package for the industrial temperature range of −40°C to +85°C.


  • Medical imaging (CW ultrasound beamforming)
  • Phased array systems (radar and adaptive antennas)
  • Communication receivers


  • 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 x LO: 100 kHz to 200 MHz
    RF: dc to 50 MHz
    Baseband: determined by external filtering
  • Output dynamic range: 159 dB/Hz
  • LO drive > 0 dBm (50 Ω); 4 x LO > 1 MHz
  • Supply: ±5 V
  • Power consumption: 190 mW/channel (380 mW total)
  • Power down

Functional Block Diagram for AD8333

Additional Information

For additional ADI Healthcare Products and related information, please visit


Title Content Type File Type
AD8333: DC to 50 MHz, Dual I/Q Demodulator and Phase Shifter Data Sheet (Rev E, 08/2012) (pdf, 708 kB) Data Sheets PDF
AN-924: Digital Quadrature Modulator Gain  (pdf, 105 kB) Application Notes PDF
How Ultrasound System Considerations Influence Front-End Component Choice
by Eberhard Brunner, Analog Devices, Inc.
(Analog Dialogue Vol. 36, May-July 2002)
Technical Articles HTML
Streamline medical ultrasound designs with monolithic Doppler phase-shifter
(eeTimes, 4/25/2005)
Technical Articles HTML
RF Source Booklet  (PDF, 4353 kB)
RF IC Product Overview - Version P (02/2014)
Overview PDF
Leading Inside Advertorials: Broadband I/Q Modulator Eases Radio Design  (pdf, 69 kB) Overview PDF
Medical Applications Overview HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8333 SPICE Macro Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

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Price, packaging, availability

AD8333 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8333ACPZ-REEL Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 5000 - - Y  Material Info PCN Purchase
AD8333ACPZ-REEL7 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $9.06 Y  Material Info PCN Purchase Sample
AD8333ACPZ-WP Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 36 $10.41 $9.06 Y  Material Info Notify Me Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD8333 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8333-EVALZ Status: Production Evaluation Board $311.78 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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