General Description
The MAX2079 fully integrated octal ultrasound receiver is optimized for high channel count, high-performance portable and cart-based ultrasound systems. The easy-to-use integrated receiver allows the user to achieve high-end 2D and Doppler imaging capability using substantially less space and power. The highly compact low-noise amplifier (LNA), variable-gain amplifier (VGA), anti-alias filter (AAF), analog-to-digital converter (ADC), and digital highpass filter (HPF) achieve an ultra-low 2.8dB noise figure at RS = RIN = 200I with a very low 120mW per channel power dissipation at 50Msps. The full receive channel has been optimized for second harmonic imaging with an exceptional 76dBFS SNR over a 2MHz bandwidth, and -70dBc second-harmonic distortion at fRF = 5MHz over the full receiver gain range. Near-carrier dynamic range has also been optimized for exceptional pulsed and color-flow Doppler performance under high-clutter conditions. The bipolar front-end and CMOS ADC achieve an exceptional near-carrier SNR of 137dBFS/Hz at 1kHz from a 5MHz tone for excellent low velocity Doppler sensitivity.

Benefits and Features
◆ Minimizes PCB Area and Design Cost
   ◇ 8 Full Channels of LNA, VGA, AAF, 12-Bit ADC,
   Digital HPF and CWD Mixer Beamformer in a
   Small, 10mm x 10mm CTBGA Package
◆ Improves System Sensitivity
   ◇ Ultra-Low Full-Channel Noise Figure of 2.8dB at
      RS = RIN = 200I
◆ Improves System Dynamic Range
   ◇ 76dBFS 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 120mW per Full
      Channel in Imaging Mode at 50Msps
◆Selectable Active Input Impedance Matching of
   50I, 100I, 200I, and 1kI
◆ 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
  
Applications
   Medical Ultrasound Imaging
   Sonar