MAX2034

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

Data Sheet (Rev. 1)

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Overview

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

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 V_OUT = 1V_P-P and f_IN = 5MHz, and an ultrasound-specific* two-tone third-order intermodulation distortion performance of -55dBc at V_OUT = 1V_P-P and f_IN = 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