Quad-Channel, Ultra-Low-Noise Amplifier with Digitally Programmable Input Impedance

Fully Integrated Quad Ultrasound LNA Delivers 19dB of Gain and 2.2dB of NF with the Added Feature of Supporting Programmable Input Impedances of 50Ω, 100Ω, 200Ω, and 1kΩ

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The MAX2034 four-channel, low-power, ultra-low-noise preamplifier is designed for ultrasound and medical instrumentation applications. Each low-noise amplifier has a single-ended input, differential output, a highly accurate 19dB fixed gain, and a wide -3dB bandwidth of 70MHz. The high-gain accuracy of the amplifier allows for exceptional channel-to-channel gain matching, which is necessary for high-performance ultrasound-imaging applications. The MAX2034 also includes an on-chip programmable input impedance feature that allows the device to be compatible with a variety of common source impedances ranging from 50Ω to 1kΩ. The input impedance of each amplifier uses a feedback topology for active impedance matching. The active input impedance matching feature achieves an exceptionally low 2.2dB noise figure with a source and input impedance of 200Ω.

The MAX2034 has excellent dynamic and linearity performance characteristics optimized for all ultrasound-imaging modalities including second harmonic 2D imaging and continuous wave Doppler. The device achieves a second harmonic distortion of -68dBc at VOUT = 1VP-P and fIN = 5MHz, and an ultrasound-specific* two-tone third-order intermodulation distortion performance of -55dBc at VOUT = 1VP-P and fIN = 5MHz.

The MAX2034 is also optimized for quick overload recovery for operation under the large input signal conditions typically found in ultrasound input-buffer imaging applications.

The MAX2034 is available in a 48-pin thin QFN package with an exposed paddle. Electrical performance is guaranteed over a 0°C to +70°C temperature range.
MAX2034: Typical Application Circuit MAX2034: Typical Application Circuit Enlarge+

Key Features

  • High-Level Integration of 4 Channels
  • Digitally Programmable Input Impedance (RIN) of 50Ω, 100Ω, 200Ω, and 1kΩ
  • Integrated Input Clamp
  • Integrated Input-Damping Capacitor
  • Ultra-Low 2.2dB Noise Figure at RS = RIN = 200Ω
  • 70MHz, -3dB Bandwidth
  • Low 58mW/Channel Power Dissipation
  • HD2 of -68dBc at VOUT = 1VP-P and fIN = 5MHz for Exceptional Second Harmonic Imaging Performance
  • Two-Tone Ultrasound-Specific* IMD3 of -55dBc at VOUT = 1VP-P and fIN = 5MHz for Exceptional PW/CW Doppler Performance
  • Quick Large-Signal Overload Recovery
  • Single +5V Supply Operation
  • Sleep Mode


  • Sonar Signal Amplification
  • Ultrasound Imaging
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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