Features and Benefits
- Quad integrated I/Q demodulator
- 16 phase select on each output (22.5° per step)
4LO: LF to 200 MHz
RF: LF to 50 MHz
Baseband: determined by external filtering
- Power consumption: 73 mW/channel (290 mW total)
- Quadrature demodulation accuracy:
Phase accuracy: ±1°
Amplitude balance: ±0.25 dB
- Output dynamic range: 160 dB/Hz
- LO drive: >0 dBm (50 Ω), single-ended sine wave
- Supply: ±5 V
- Power-down via SPI (each channel and complete chip)
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
- Communication receivers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The AD8339 is configured using the software provided on the CD included with the evaluation board, or using an external digital pattern generator via the 20-pin flat-cable connector P1.
See data sheet for the AD8339, Eval Board section for full explantion. Also reference the data sheet for AD9271.
Documentation & Resources
8-Channel, 12-Bit, 10-MSPS to 50-MSPS Front End: The AD9271—A Revolutionary Solution for Portable Ultrasound7/1/2007 Analog Dialogue
Streamline medical ultrasound designs with monolithic Doppler phase-shifter4/25/2005
How Ultrasound System Considerations Influence Front-End Component Choice7/1/2002
AN-924: Digital Quadrature Modulator Gain11/20/2020
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|AD8339ACPZ||Material Declaration||Reliability Data||40-Lead LFCSP (6mm x 6mm w/ EP)|
|AD8339ACPZ-R7||Material Declaration||Reliability Data||40-Lead LFCSP (6mm x 6mm w/ EP)|
|AD8339ACPZ-RL||Material Declaration||Reliability Data||40-Lead LFCSP (6mm x 6mm w/ EP)|
|Wafer Fabrication Data|
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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.