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
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/MAX2035/MAX2037
EEPW Analog/Mixed-Signal IC Technical Innovation Award Winner 2006
Key Features
Applications/Uses
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
*See the Ultrasound-Specific IMD3 Specification in the Applications Information section of the data sheet.
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