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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 50? to 1k?. 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 200?.

Features

? High-Level Integration of 4 Channels

? Digitally Programmable Input Impedance (RIN) of

?? 50?, 100?, 200?, and 1k?

? Integrated Input Clamp

? Integrated Input-Damping Capacitor

? Ultra-Low 2.2dB Noise Figure at RS = RIN = 200?

? 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