General Description

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 ultra-sound-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.

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

Applications

   Ultrasound Imaging

   Sonar Signal Amplification