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. Applications * Sonar Signal Amplification * Ultrasound Imaging * 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