Full Octal Ultrasound Receiver with Integrated T/R Switch

Only Ultrasound Receiver with Integrated T/R Switch and Input Coupling Caps-Saves 40% Board Space for a 64- or 128-Channel System

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The MAX2081 is a fully integrated octal ultrasound receiver optimized for high-channel-count, high-performance portable and cart-based ultrasound systems. The integrated receiver allows the user to achieve “high-end” 2D and Doppler imaging using substantially less space and power.

The MAX2081 includes a transmit/receive (T/R) switch; LNA input-coupling and feedback capacitors; and LNA, VGA, AAF, ADC, and digital HPF. It achieves an ultra-low 2.8dB noise figure at RS = RIN = 200Ω with a very low 130mW per channel power dissipation at 50Msps. The full receive channel has been optimized for second-harmonic imaging with -60dBFS second-harmonic distortion performance at fIN = 5MHz over the full TGC range.

Dynamic range has also been optimized for exceptional pulsed and color-flow Doppler performance under high-clutter conditions. The full receive channel exhibits an exceptional 76.2dBFS SNR at 5MHz with a 2MHz bandwidth. The bipolar front-end and CMOS ADC have also been optimized for an exceptionally low near-carrier modulation noise of 137dBc/Hz at 1kHz offset from a 5MHz tone for excellent low-velocity Doppler sensitivity.

The MAX2081 also includes an octal CWD beamformer for a full Doppler solution. Separate mixers for each channel are made available for optimal CWD sensitivity. The MAX2081 octal ultrasound front-end is available in a small 10mm x 16mm BGA package and is specified over a 0°C to +70°C temperature range.

Key Features

  • Minimizes PCB Area and Design Cost
    • 8 Full Channels of LNA, VGA, AAF, 12-Bit ADC, Digital HPF, CWD Mixer Beamformer, and T/R Switch in a Small, 10mm × 16mm CTBGA Package
  • Improves System Sensitivity
    • Ultra-Low Full-Channel Noise Figure of 2.8dB at RS = RIN = 200Ω
  • Improves System Dynamic Range
    • 76.2dBFS Image Path SNR Over 2MHz Bandwidth at fRF = 5MHz
    • 137dBFS/Hz Image Path SNR at 1kHz Offset from fRF = 5MHz
  • Consumes Less Power
    • Ultra-Low Power of Only 130mW per Full Channel in Imaging Mode at 50Msps
  • Selectable Active Input Impedance Matching of 50Ω, 100Ω, 200Ω, and 1kΩ
  • Programmable VGA Output Clamp
  • Integrated Selectable 3-Pole 9MHz, 10MHz, 15MHz, and 18MHz Butterworth Anti-Alias Filter
  • Programmable, Digital Highpass, 2-Pole Filter
  • Serial LVDS Digital Outputs
  • Fast Recovery Low-Power Modes (< 2µs)
  • Separate Channel I/Q CWD Mixers for Improved Dynamic Range and Sensitivity


  • Sonar
  • Ultrasound
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