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AD8339:  DC to 50 MHz, Quad I/Q Demodulator and Phase Shifter

Product Details

Product Status:Recommended for New Designs

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The AD8339 is a quad I/Q demodulator configured to be driven by a low noise preamplifier with differential outputs. It is optimized for the LNA in the AD8332/AD8334/AD8335 family of VGAs. The part consists of four identical I/Q demodulators with a 4× 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) because each has a separate RF input.

Continuous wave (CW) analog beamforming (ABF) and I/Q demodulation are combined in a single 40-lead ultracompact chip scale device, making the AD8339 particularly applicable in high density ultrasound scanners. In an ABF system, time domain coherency is achieved following the appropriate phase alignment and summation of multiple receiver channels. A reset pin synchronizes multiple ICs to start each LO divider in the same quadrant. Sixteen programmable 22.5° phase increments are available for each channel. For example, if Channel 1 is used as a reference and Channel 2 has an I/Q phase lead of 45°, then the user can phase align Channel 2 with Channel 1 by choosing the correct code.

The mixer outputs are in current form for convenient summation. The independent I and Q mixer output currents are summed and converted to a voltage by a low noise, high dynamic range, current-to-voltage (I-V) transimpedance amplifier, such as the AD8021 or the AD829. Following the current summation, the combined signal is applied to a high resolution analog-to-digital converter (ADC), such as the AD7665 (16-bit, 570 kSPS).

An SPI-compatible serial interface port is provided to easily program the phase of each channel; the interface allows daisy chaining by shifting the data through each chip from SDI to SDO. The SPI also allows for power-down of each individual channel and the complete chip. During power-down, the serial interface remains active so that the device can be programmed again.

The dynamic range is typically 160 dB/Hz at the I and Q outputs. The AD8339 is available in a 6 mm × 6 mm, 40-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C.


  • Medical imaging (CW ultrasound beamforming)
  • Phased array systems
  • Radar
    Adaptive antennas
  • Communication receivers


  • 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 to 200 MHz
    RF: LF to 50 MHz
    Baseband: determined by external filtering
  • Output dynamic range: 160 dB/Hz
  • LO drive: >0 dBm (50 Ω), single-ended sine wave
  • Supply: ±5 V
  • Power consumption: 73 mW/channel (290 mW total)
  • Power-down via SPI (each channel and complete chip)

Functional Block Diagram for AD8339

Of Note . . .

Technical Article: Low Power Continuous Wave (CW) Doppler for Portable Ultrasound Systems

For additional ADI Healthcare Products and related information, please visit


Title Content Type File Type
AD8339: DC to 50 MHz, Quad I/Q Demodulator and Phase Shifter Data Sheet (Rev B, 07/2012) (pdf, 1782 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

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Price, packaging, availability

AD8339 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8339ACPZ Status: Production 40 ld LFCSP (6x6mm w/4.1mm pad) 40 Ind Tray, 490 $13.90 $12.09 Y  Material Info Notify Me Purchase
AD8339ACPZ-R7 Status: Production 40 ld LFCSP (6x6mm w/4.1mm pad) 40 Ind Reel, 750 $13.90 $12.09 Y  Material Info Notify Me Purchase
AD8339ACPZ-RL Status: Production 40 ld LFCSP (6x6mm w/4.1mm pad) 40 Ind Reel, 2500 - $12.09 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.

AD8339 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8339-EVALZ Status: Production Evaluation Board $370.74 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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