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AD9279:  Octal LNA/VGA/AAF/ADC and CW I/Q Demodulator

Product Details

Product Status:Recommended for New Designs

The AD9279 is designed for low cost, low power, small size, and ease of use for medical ultrasound and automotive radar. It contains eight channels of a variable gain amplifier (VGA) with a low noise preamplifier (LNA), an antialiasing filter (AAF), an analog-to-digital converter (ADC), and an I/Q demodulator with programmable phase rotation.

Each channel features a variable gain range of 45 dB, a fully differential signal path, an active input preamplifier termination, and a maximum gain of up to 52 dB. The channel is optimized for high dynamic performance and low power in applications where a small package size is critical.

The LNA has a single-ended-to-differential gain that is selectable through the SPI. Assuming a 15 MHz noise bandwidth (NBW) and a 21.3 dB LNA gain, the LNA input SNR is roughly 94 dB. In CW Doppler mode, each LNA output drives an I/Q demod-ulator that has independently programmable phase rotation with 16 phase settings.

Power-down of individual channels is supported to increase battery life for portable applications. Standby mode allows quick power-up for power cycling. In CW Doppler operation, the VGA, AAF, and ADC are powered down. The ADC contains several features designed to maximize flexibility and minimize system cost, such as a programmable clock, data alignment, and programmable digital test pattern generation. The digital test patterns include built-in fixed patterns, built-in pseudo random patterns, and custom user-defined test patterns entered via the serial port interface.

FEATURES and BENEFITS

8 channels of LNA, VGA, AAF, ADC, and I/Q demodulator

  • Low power : 141 mW per channel, TGC mode, 40 MSPS;
    60 mW per channel, CW mode
  • 10 mm × 10 mm, 144-ball CSP-BGA
  • TGC channel input-referred noise: 0.8 nV/√Hz, max gain
  • Flexible power-down modes
  • Fast recovery from low power standby mode: <2us
  • Overload recovery: <10 ns

Low noise preamplifier (LNA)

  • Input-referred noise: 0.75 nV/√Hz , gain = 21.3 dB
  • Programmable gain: 15.6 dB/17.9 dB/21.3 dB
  • 0.1 dB compression: 1000 mV p-p/750 mV p-p/450 mV p-p
  • Dual-mode active input impedance matching
  • Bandwidth (BW) > 100 MHz

Variable gain amplifier (VGA)

  • Attenuator range: −45 dB to 0 dB
  • Postamp gain (PGA): 21 dB/24 dB/27 dB/30 dB
  • Linear-in-dB gain control

Antialiasing filter (AAF)

  • Programmable second-order LPF from 8 MHz to 18 MHz
  • Programmable HPF

Analog-to-digital converter (ADC)

  • SNR: 70 dB, 12 bits up to 80 MSPS
  • Serial LVDS (ANSI-644, Low power/reduced signal)

CW mode I/Q demodulator

  • Individual programmable phase rotation
  • Output dynamic range per channel: >160 dBc/√Hz
  • Output-referred SNR: 155 dBc/√Hz, 1kHz offset, -3dBFS

Functional Block Diagram for AD9279

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD9279 Evaluation Board, ADC-FMC Interposer & Xilinx ML605 Reference Design FPGA HDL HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Gain Control of VGA for the AD9279 Recommended Clock Drivers for the AD9279
  • For low jitter performance and integrated VCO, we recommend the AD9520-0 and AD9522-0.
  • For low jitter, low power, clock fanout buffers, we suggest the ADCLK846 or ADCLK946.
Recommended Driver Amplifiers for the AD9279
  • For I-to-V conversion and ADC driver in CW signal path, we recommend the ADA4896-2 or the ADA4897-2.
Recommended A/D Converter for the AD9279
  • For sampling the I and Q signals in analog beamforming applications, we recommend the AD7982.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

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.

AD9279 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9279-65EBZ Status: Production Evaluation Board $250.00 Yes -
AD9279-80KITZ Status: Production Evaluation Board $1,100.00 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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