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AD9674:  Octal Ultrasound AFE

Product Details

Product Status:Recommended for New Designs

The AD9674 is designed for low cost, low power, small size, and ease of use for medical ultrasound. It contains eight channels of a variable gain amplifier (VGA) with a low noise preamplifier (LNA), a CW harmonic rejection I/Q demodulator with programmable phase rotation, an anti-aliasing filter (AAF), an analog-to-digital converter (ADC), a digital highpass filter and an RF decimation by 2.

Each channel features a maximum gain of up to 52 dB, a fully differential signal path, and an active input preamplifier termination. 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 21.6 dB LNA gain, the LNA input SNR is 94 dB. In CW Doppler mode, each LNA output drives an I/Q demodulator 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 digital RF decimator
    -- Low power: 150 mW per channel, TGC mode, 40 MSPS; 65 mW per channel, CW mode; <30mW at power-up
    -- 10 mm × 10 mm, 144-ball CSP-BGA
    -- See data sheet for additional features
  • Low noise preamplifier (LNA)
    -- Input-referred noise: 0.78 nV/√Hz, gain = 21.6 dB
    -- Programmable gain: 15.6 dB/17.9 dB/21.6 dB
    -- 0.1 dB compression: 1000 mV p-p/750 mV p-p/450 mV p-p
    -- Flexible active input impedance matching
  • Variable gain amplifier (VGA)
    -- Attenuator range: 45dB, Linear-in-dB gain control
    -- Postamp gain (PGA): 21 dB/24 dB/27 dB/30 dB
  • Antialiasing filter (AAF)
    -- Programmable second-order LPF from 8 MHz to 18 MHz or 13.5MHz to 30MHz and HPF
  • Analog-to-digital converter (ADC)
    -- SNR: 75dB, 14 bits up to 125 MSPS
  • Configurable Serial LVDS
  • CW mode harmonic rejection I/Q demodulator
    -- Individual programmable phase rotation
    -- Output dynamic range per channel: >160 dBc/√Hz
    -- Close-in SNR: 156 dBc/√Hz, 1 kHz offset, −3dBFS
  • RF digital high-pass filter and decimation by 2

Additional Information

A short-form datasheet for this product is available for download from this web page. Complete documentation including detailed hardware and software guides are available upon completion of a Non-Disclosure Agreement (NDA) (pdf, 30,264 bytes). Send your completed forms by e-mail to Highspeed.converters@analog.com.
Additional support is available from your Analog Devices local sales.
Please contact the ADC Development Group for additional technical information.
For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.

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Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Gain Control of VGA for the AD9674 Recommended Clock Drivers for the AD9674
  • 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 AD9674
  • 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 AD9674
  • 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

AD9674 Model Options
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.


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